{"id":5369,"date":"2026-07-13T09:00:00","date_gmt":"2026-07-13T09:00:00","guid":{"rendered":"https:\/\/www.simplywise.com\/blog\/?p=5369"},"modified":"2026-07-13T16:53:27","modified_gmt":"2026-07-13T16:53:27","slug":"costly-mistakes-building-custom-homes","status":"publish","type":"post","link":"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/","title":{"rendered":"10 Costly Mistakes Every General Contractor Should Avoid When Building Custom Homes"},"content":{"rendered":"<p><script>\ndocument.addEventListener('DOMContentLoaded', function() {\n  var sels = ['.entry-header','.page-header','article > h1:first-child','.entry-footer'];\n  sels.forEach(function(s){document.querySelectorAll(s).forEach(function(el){el.style.display='none';});});\n  var el = document.querySelector('.sw-a');\n  while (el && el !== document.body) {\n    el.style.maxWidth='100%'; el.style.width='100%'; el.style.padding='0'; el.style.margin='0';\n    el.style.float='none'; el.style.flex='0 0 100%';\n    el = el.parentElement;\n  }\n  document.body.style.marginTop='0'; document.body.style.paddingTop='0';\n});\n<\/script>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@400;500;600;700;800&#038;display=swap\" rel=\"stylesheet\">\n<!-- Post 5369 rebuilt WHOLE in 02 Article crash-course format. Inline-styled, WordPress-push-ready. Post target: \/blog\/costly-mistakes-building-custom-homes\/ --><br \/>\n<!-- Hero image: interior of a custom home under construction with wood stud framing (Unsplash photo-1704742950992), chosen to match the custom-home-building topic, verified 200 on 2026-07-13. 2:1 ratio. loading=\"eager\". --><\/p>\n<style id=\"sw-a-mobile\">.single-post .entry-header{display:none !important;}.single-post .entry-meta{display:none !important;}.single-post .post-tags,.single-post .entry-footer,.single-post .breadcrumb-nav{display:none !important;}.single-post article.post .entry-content{padding-top:0 !important;margin-top:0 !important;}.single-post .content-area,.single-post #primary{padding:0 !important;}.single-post .site-main{padding:0 !important;}.single-post .row--index>.col-xs-12{padding-left:0 !important;padding-right:0 !important;}.single-post .row.no-pad>[class*=\"col-\"]{width:100% !important;max-width:100% !important;flex:0 0 100% !important;margin-left:0 !important;padding-left:0 !important;padding-right:0 !important;}.single-post article.post{max-width:100% !important;}.single-post article.post .entry-content{max-width:100% !important;width:100% !important;}.single-post .container,.single-post .container-fluid{max-width:100% !important;width:100% !important;padding-left:0 !important;padding-right:0 !important;}.sw-a *{box-sizing:border-box;}.sw-a{--ink:#0f172a;--ink2:#334155;--muted:#64748b;--mute2:#94a3b8;--line:#e2e8f0;--line2:#cbd5e1;--surface:#f8fafc;--tldr-bg:#eff6ff;--tldr-bd:#93c5fd;--blue:#2563eb;--blue-dark:#1e3a8a;--blue-light:#3b82f6;--amber:#f59e0b;font-family:-apple-system,\"Inter\",\"SF Pro Text\",\"Segoe UI\",Roboto,sans-serif;color:var(--ink2);line-height:1.7;font-size:17px;max-width:100%;margin:0;background:#fff;}.sw-a a{color:var(--blue);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1.5px;transition:color .15s ease;}.sw-a a:hover{color:var(--blue-dark);}.sw-a p{margin:0 0 20px;}.sw-a strong{color:var(--ink);font-weight:600;}.sw-a ul,.sw-a ol{margin:0 0 20px;padding-left:26px;}.sw-a li{margin-bottom:8px;}.sw-a__inner{max-width:1200px;margin:0 auto;width:100%;}.sw-a__hero{padding:96px 120px 64px;text-align:center;background:#fff;}.sw-a__hero .sw-a__breadcrumb{font-size:13px;font-weight:500;letter-spacing:0.52px;color:var(--muted);margin:0 0 24px;}.sw-a__eyebrow{display:inline-block;background:var(--tldr-bg);color:var(--blue);font-size:12px;font-weight:700;letter-spacing:1.44px;padding:6px 14px;border-radius:999px;margin:0 0 24px;text-transform:uppercase;}.sw-a__hero h1,.sw-a h1{font-family:Inter,-apple-system,sans-serif;font-weight:800;font-size:60px;line-height:1.08;letter-spacing:-1.2px;color:var(--ink);margin:0 0 24px;max-width:960px;margin-left:auto;margin-right:auto;}.sw-a .sw-a__subtitle{font-size:20px;line-height:1.6;color:var(--muted);max-width:720px;margin-left:auto !important;margin-right:auto !important;margin-top:0;margin-bottom:32px;}.sw-a__meta{display:inline-flex;gap:14px;align-items:center;color:var(--muted);font-size:13px;letter-spacing:0.52px;}.sw-a__meta span{display:inline-flex;align-items:center;gap:6px;}.sw-a__meta .sw-a__dot{width:4px;height:4px;border-radius:50%;background:var(--mute2);display:inline-block;}.sw-a__hero-figure{margin:48px auto 0;max-width:960px;}.sw-a__hero-figure img{width:100%;height:auto;border-radius:14px;display:block;background:var(--surface);aspect-ratio:2\/1;object-fit:cover;border:1px solid var(--line);}.sw-a__tldr{padding:48px 120px;}.sw-a__tldr-box{background:var(--tldr-bg);border:1px solid var(--tldr-bd);border-radius:14px;padding:28px 40px 32px;display:flex;flex-direction:column;gap:14px;max-width:920px;margin:0 auto;}.sw-a__tldr-label{font-size:11.5px;font-weight:700;letter-spacing:1.6px;color:var(--blue-dark);text-transform:uppercase;line-height:1.3;display:inline-flex;align-items:center;gap:10px;}.sw-a__tldr-label::before{content:\"\";display:block;width:22px;height:2px;background:var(--blue);border-radius:2px;}.sw-a__tldr-body{color:var(--ink);font-size:15.5px;line-height:1.65;}.sw-a__tldr-body ol{margin:0;padding-left:20px;}.sw-a__tldr-body ol li{margin-bottom:6px;}.sw-a__body{padding:32px 120px 48px;}.sw-a__body h2{font-family:Inter,sans-serif;font-weight:800;font-size:36px;line-height:1.15;letter-spacing:-0.6px;color:var(--ink);margin:48px auto 20px;max-width:760px;}.sw-a__body h2:first-child{margin-top:0;}.sw-a__body h3{font-family:Inter,sans-serif;font-weight:700;font-size:22px;line-height:1.3;color:var(--ink);margin:32px auto 12px;max-width:760px;}.sw-a__body p,.sw-a .sw-a__body ul,.sw-a .sw-a__body ol,.sw-a__body table{max-width:760px;margin-left:auto;margin-right:auto;}.sw-a__steps{max-width:920px;margin:24px auto 32px;counter-reset:step;list-style:none;padding-left:0;}.sw-a__steps>li{counter-increment:step;position:relative;padding:20px 24px 20px 84px;border-top:1px solid var(--line);}.sw-a__steps>li:last-child{border-bottom:1px solid var(--line);}.sw-a__steps>li::before{content:counter(step);position:absolute;left:16px;top:20px;width:52px;height:52px;border-radius:50%;background:var(--blue);color:#fff;font-family:Inter,sans-serif;font-weight:800;font-size:20px;display:flex;align-items:center;justify-content:center;letter-spacing:0;}.sw-a__steps>li h3{margin:0 0 6px;font-size:22px;font-weight:700;color:var(--ink);max-width:none;}.sw-a__steps>li p{margin:0;color:var(--ink2);font-size:16.5px;line-height:1.65;max-width:none;}.sw-a__steps>li p+p{margin-top:10px;}.sw-a__body table{border-collapse:collapse;width:100%;margin:20px auto 24px;font-size:15px;line-height:1.5;}.sw-a__body th,.sw-a__body td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top;}.sw-a__body th{background:var(--surface);font-weight:600;color:var(--ink);font-size:13px;letter-spacing:0.3px;text-transform:uppercase;}.sw-a__body tbody tr:hover{background:#fafbfc;}.sw-a__pull{background:var(--ink);color:#fff;padding:64px 120px;text-align:center;}.sw-a__pull blockquote{margin:0 auto;max-width:900px;font-family:Inter,sans-serif;font-weight:800;font-size:30px;line-height:1.3;letter-spacing:-0.4px;color:#fff;}.sw-a__pull blockquote::before{content:\"\\201C\";display:block;font-size:96px;color:var(--blue-light);line-height:0.7;margin-bottom:16px;font-weight:800;}.sw-a__pull cite{display:block;margin-top:24px;font-size:14px;color:#64748b;font-style:normal;letter-spacing:0.5px;}.sw-a__callout{background:var(--surface);border-left:4px solid var(--blue);padding:20px 24px;margin:24px auto;max-width:760px;border-radius:0 10px 10px 0;font-size:16px;color:var(--ink2);}.sw-a__callout strong{color:var(--ink);}.sw-a__faq{background:var(--surface);padding:96px 120px;}.sw-a__faq h2{font-family:Inter,sans-serif;font-weight:800;font-size:36px;line-height:1.15;letter-spacing:-0.6px;color:var(--ink);margin:0 auto 40px;max-width:900px;text-align:center;}.sw-a__faq-list{max-width:900px;margin:0 auto;}.sw-a__faq-cat{font-family:Inter,sans-serif;font-weight:700;font-size:20px;color:var(--ink);margin:32px 0 12px;letter-spacing:-0.2px;}.sw-a__faq-cat:first-child{margin-top:0;}.sw-a__faq details{background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:12px;overflow:hidden;}.sw-a__faq details[open]{border-color:var(--line2);box-shadow:0 1px 3px rgba(15,23,42,0.06);}.sw-a__faq summary{list-style:none;cursor:pointer;padding:20px 24px;font-weight:600;color:var(--ink);font-size:17px;position:relative;padding-right:56px;}.sw-a__faq summary::-webkit-details-marker{display:none;}.sw-a__faq summary::after{content:\"+\";position:absolute;right:20px;top:18px;font-size:26px;font-weight:400;color:var(--muted);transition:transform .2s ease;line-height:1;}.sw-a__faq details[open] summary::after{content:\"\\2013\";}.sw-a__faq-answer{padding:0 24px 22px;color:var(--ink2);font-size:16px;line-height:1.7;}.sw-a__finalcta{background:var(--ink);color:#fff;padding:96px 120px;text-align:center;}.sw-a__finalcta .sw-a__eyebrow{background:rgba(37,99,235,0.15);color:var(--blue-light);}.sw-a__finalcta h2{font-family:Inter,sans-serif;font-weight:800;font-size:48px;line-height:1.1;letter-spacing:-1px;color:#fff;margin:0 0 20px;max-width:820px;margin-left:auto;margin-right:auto;}.sw-a__finalcta p{color:#cbd5e1;font-size:18px;line-height:1.65;max-width:640px;margin:0 auto 32px;}.sw-a__cta-buttons{display:inline-flex;gap:14px;flex-wrap:wrap;justify-content:center;}.sw-a a.sw-a__btn,.sw-a .sw-a__btn{color:#fff !important;text-decoration:none !important;background:#2563eb !important;border:none !important;display:inline-block;font-weight:700;font-size:16px;padding:18px 32px;border-radius:10px;letter-spacing:0.2px;transition:background .15s ease,transform .15s ease;}.sw-a a.sw-a__btn:hover{background:#3b82f6 !important;color:#fff !important;transform:translateY(-1px);}.sw-a a.sw-a__btn--ghost{background:rgba(255,255,255,0.08) !important;border:1px solid rgba(255,255,255,0.18) !important;color:#fff !important;text-decoration:none !important;}.sw-a a.sw-a__btn--ghost:hover{background:rgba(255,255,255,0.14) !important;}@media (max-width:600px){.sw-a__hero{padding:48px 18px 32px;}.sw-a__hero h1,.sw-a h1{font-size:34px;line-height:1.12;letter-spacing:-0.6px;margin:0 0 18px;}.sw-a .sw-a__subtitle{font-size:16.5px;line-height:1.55;margin-left:auto !important;margin-right:auto !important;margin-top:0;margin-bottom:24px;}.sw-a__meta{flex-wrap:wrap;justify-content:center;gap:8px 14px;font-size:12.5px;}.sw-a__hero-figure{margin:32px auto 0;}.sw-a__hero-figure img{aspect-ratio:16\/10;}.sw-a__tldr{padding:24px 18px;}.sw-a__tldr-box{flex-direction:column;gap:14px;padding:24px 22px;}.sw-a__tldr-label{width:auto;padding-top:0;font-size:11.5px;letter-spacing:1.2px;}.sw-a__tldr-body{font-size:15px;line-height:1.6;}.sw-a__body{padding:24px 18px 36px;}.sw-a__body h2{font-size:26px;line-height:1.2;letter-spacing:-0.3px;margin:36px 0 14px;}.sw-a__body h3{font-size:19px;line-height:1.3;margin:24px 0 10px;}.sw-a__body p,.sw-a .sw-a__body ul,.sw-a .sw-a__body ol,.sw-a__body table{max-width:100%;}.sw-a__steps{padding-left:0;margin:18px auto 24px;}.sw-a__steps>li{padding:18px 0 18px 56px;}.sw-a__steps>li::before{width:42px;height:42px;font-size:17px;left:0;top:18px;}.sw-a__steps>li h3{font-size:18px;margin:0 0 6px;}.sw-a__steps>li p{font-size:15.5px;line-height:1.6;}.sw-a__body table{display:block;overflow-x:auto;white-space:nowrap;-webkit-overflow-scrolling:touch;font-size:13.5px;border:1px solid var(--line);border-radius:10px;}.sw-a__body th,.sw-a__body td{padding:10px 14px;}.sw-a__body th{font-size:11.5px;letter-spacing:0.4px;}.sw-a__pull{padding:48px 18px;}.sw-a__pull blockquote{font-size:21px;line-height:1.4;}.sw-a__faq{padding:64px 18px;}.sw-a__faq h2{font-size:28px;}.sw-a__faq-cat{font-size:18px;margin:24px 0 10px;}.sw-a__faq-answer{font-size:15px;line-height:1.6;}.sw-a__faq details>summary{font-size:15.5px;padding:14px 16px;}.sw-a__finalcta{padding:64px 18px;}.sw-a__finalcta h2{font-size:30px;line-height:1.15;letter-spacing:-0.4px;}.sw-a__finalcta p{font-size:16px;}.sw-a__cta-buttons{flex-direction:column;gap:12px;width:100%;}.sw-a a.sw-a__btn,.sw-a .sw-a__btn{width:100%;text-align:center;padding:16px 22px;font-size:15.5px;}}.sw-a .sw-a__steps{max-width:760px;margin:24px auto 32px;}.sw-a .sw-a__steps>li{max-width:none;}.sw-a .sw-a__body ul,.sw-a .sw-a__body ol{max-width:760px;margin:0 auto 20px;}.sw-a .sw-a__body ul li,.sw-a .sw-a__body ol li{margin-bottom:8px;}\n\/* WCAG AA eyebrow contrast fix - appended *\/\n.sw-a__eyebrow,.sw-l__eyebrow,.eyebrow{color:#1d4ed8!important;}\n\/* Sources card, matches the TLDR panel *\/ .sw-a .sw-a__sources{background:var(--tldr-bg);border:1px solid var(--tldr-bd);border-radius:14px;padding:26px 32px 24px;max-width:760px;margin:40px auto 8px;} .sw-a .sw-a__sources h2{font-family:Inter,sans-serif;font-size:11.5px;font-weight:700;letter-spacing:1.6px;color:var(--blue-dark);text-transform:uppercase;margin:0 0 16px;max-width:none;display:inline-flex;align-items:center;gap:10px;line-height:1.3;} .sw-a .sw-a__sources h2::before{content:\"\";display:block;width:22px;height:2px;background:var(--blue);border-radius:2px;} .sw-a .sw-a__sources ul{list-style:none;margin:0;padding:0;max-width:none;} .sw-a .sw-a__sources ul li{margin:0 0 12px;padding:0 0 12px;border-bottom:1px solid var(--line2);font-size:14px;line-height:1.6;color:var(--muted);} .sw-a .sw-a__sources ul li:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none;} .sw-a .sw-a__sources a{color:var(--blue-dark);font-weight:600;text-decoration:none;} .sw-a .sw-a__sources a:hover{text-decoration:underline;} @media (max-width:640px){.sw-a .sw-a__sources{padding:20px 18px 16px;margin:28px auto 4px;}.sw-a .sw-a__sources ul li{font-size:13.5px;}}\n.sw-a__tldr-cta{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--tldr-bd);padding-top:16px;margin-top:2px;}.sw-a__tldr-cta span{color:var(--ink);font-size:15px;line-height:1.5;font-weight:500;}.sw-a__tldr-cta a{display:inline-flex;align-items:center;white-space:nowrap;padding:10px 20px;border-radius:8px;font-size:14px;font-weight:600;background:#2563eb;color:#fff;text-decoration:none;border:none;}.sw-a__tldr-cta a:hover{color:#fff;}.sw-a__hero-cta{display:flex;flex-direction:column;align-items:center;gap:9px;margin:4px 0 10px;}.sw-a__hero-cta a{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:10px;font-size:16px;font-weight:700;background:var(--blue);color:#fff;text-decoration:none;border:none;}.sw-a__hero-cta a:hover{color:#fff;background:var(--blue-dark);}.sw-a__hero-cta-note{font-size:13px;color:var(--muted);}.sw-a__hero-cta-note b{color:var(--ink);font-weight:700;}<\/style>\n<p><script>\n(function(){\n  try{\n    var b=document.body;\n    if(b && b.classList){b.classList.add('single-post');}\n  }catch(e){}\n})();\n<\/script><\/p>\n<article class=\"sw-a\">\n<section class=\"sw-a__hero\">\n<div class=\"sw-a__inner\">\n<div class=\"sw-a__breadcrumb\">Blog &nbsp;&rsaquo;&nbsp; Business &amp; Growth<\/div>\n<p>    <span class=\"sw-a__eyebrow\">Custom Homes &middot; Protect Your Margin<\/span><\/p>\n<h1>10 Costly Mistakes Contractors Make Building Custom Homes<\/h1>\n<p class=\"sw-a__subtitle\">A tight field guide to the ten process mistakes that quietly eat a custom home builder&#8217;s profit, and the exact move that prevents each one. Sourced from Bureau of Labor Statistics and Census data.<\/p>\n<div class=\"sw-a__hero-cta\"><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" target=\"_blank\" rel=\"noopener\">Start Estimating Free &rarr;<\/a><span class=\"sw-a__hero-cta-note\">Free to try &middot; <b>4.8<\/b> on the App Store<\/span><\/div>\n<div class=\"sw-a__meta\">\n      <span>SimplyWise<\/span><br \/>\n      <span class=\"sw-a__dot\"><\/span><br \/>\n      <span>Updated July 13, 2026<\/span><br \/>\n      <span class=\"sw-a__dot\"><\/span><br \/>\n      <span>6 min read<\/span>\n    <\/div>\n<figure class=\"sw-a__hero-figure\">\n      <img decoding=\"async\" src=\"https:\/\/images.unsplash.com\/photo-1704742950992-9815a104820c?w=960&#038;q=80\" alt=\"The interior of a custom home under construction showing wood stud framing and structural sheathing\" loading=\"eager\"><br \/>\n    <\/figure>\n<\/p><\/div>\n<\/section>\n<section class=\"sw-a__tldr\">\n<div class=\"sw-a__tldr-box\">\n<div class=\"sw-a__tldr-label\">The 10 costly custom home mistakes at a glance<\/div>\n<div class=\"sw-a__tldr-body\">\n<ol>\n<li>Underestimating site prep.<\/li>\n<li>Skipping soil and geotechnical tests.<\/li>\n<li>Writing vague allowances into the contract.<\/li>\n<li>Not locking material prices.<\/li>\n<li>Poor subcontractor scheduling.<\/li>\n<li>Skipping the pre-construction meeting.<\/li>\n<li>A weak change order process.<\/li>\n<li>Ignoring energy code updates.<\/li>\n<li>Not photographing walls before close-up.<\/li>\n<li>Skipping a formal punch list.<\/li>\n<\/ol><\/div>\n<div class=\"sw-a__tldr-cta\"><span>Tight bids start with fast, accurate estimates.<\/span><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\">Price Jobs From a Photo<\/a><\/div>\n<\/p><\/div>\n<\/section>\n<section class=\"sw-a__body\">\n<div class=\"sw-a__inner\">\n<h2>Why custom home mistakes cost more in 2026<\/h2>\n<p>Custom homes are where reputations get made or wrecked. The National Association of Home Builders puts construction costs at about 64 percent of a new home&#8217;s sale price, leaving the average builder near 11 percent for profit. Three preventable overruns can wipe that out.<\/p>\n<p>The market is tight too. The Census Bureau clocked housing starts at a 1,177,000 annual rate in May 2026, down about 9 percent from a year earlier, so every job has to pay. Yet the work is there for those who run it well: the Bureau of Labor Statistics projects construction manager jobs to grow about 9 percent through 2034.<\/p>\n<h2>The $43,000 lesson that changes how you build<\/h2>\n<p>A general contractor in the Phoenix market with 12 years of experience landed what looked like the job of a lifetime: a 4,200 square foot custom home on a hillside lot, a $1.2 million contract. He had built production homes for years, so he figured custom was just a bigger version.<\/p>\n<p>By closeout he had eaten $43,000 he never saw coming. The hillside needed far more site prep than he estimated. The homeowner changed the kitchen three times with no signed change orders. And the framing crew showed up two weeks early because nobody reset the schedule. Every one was preventable, not with more skill but with better questions before the shovel and better records after.<\/p>\n<h2>The 10 mistakes, and how to stop each one<\/h2>\n<p>None of these are about craftsmanship. They are about process, paperwork, and communication.<\/p>\n<ol class=\"sw-a__steps\">\n<li>\n<h3>Underestimating site prep<\/h3>\n<p>Production builders get flat, graded pads. Custom lots hide rock, drainage, and big trees that blow up a clearing budget. Walk each lot with your excavation sub and price site prep as its own line with real contingency.<\/p>\n<\/li>\n<li>\n<h3>Skipping soil and geotechnical tests<\/h3>\n<p>A soil test is cheap next to the foundation it protects. Expansive clay can crack a slab, and the helical piers to fix it cost tens of thousands. Make a geotechnical report non-negotiable on every build.<\/p>\n<\/li>\n<li>\n<h3>Writing vague allowances into the contract<\/h3>\n<p>Set allowances too low or too vague and the overage lands on you. Spell out each one: the dollar amount, what it covers, and materials only or installed. Anything above it is a signed change order.<\/p>\n<\/li>\n<li>\n<h3>Not locking material prices<\/h3>\n<p>Custom homes take eight to fourteen months, and prices move. A lumber package quoted early can cost thousands more by framing. Get written quotes with a price lock, and add an escalation clause on long builds.<\/p>\n<\/li>\n<li>\n<h3>Poor subcontractor scheduling<\/h3>\n<p>A custom home runs fifteen to twenty-five trades, and sequence is everything. Book flooring before the heat is on and the installer walks off. Build a week-by-week schedule before you break ground and update it weekly.<\/p>\n<\/li>\n<li>\n<h3>Skipping the pre-construction meeting<\/h3>\n<p>The pre-construction meeting is the cheapest hour on the job. Skip it and you find out during framing that the master bedroom sits two feet off the drawing. Walk the plans with the owner and key subs, and lock every deadline.<\/p>\n<\/li>\n<li>\n<h3>A weak change order process<\/h3>\n<p>Change orders are the number one source of custom home disputes. Verbal yeses and texts fall apart at settlement. Every change gets a written order with scope, price, and schedule impact, signed first. Our <a href=\"https:\/\/www.simplywise.com\/blog\/complete-guide-construction-change-orders\/\">guide to construction change orders<\/a> has the template.<\/p>\n<\/li>\n<li>\n<h3>Ignoring energy code updates<\/h3>\n<p>Energy codes keep tightening, and many jurisdictions now run the 2021 or 2024 IECC. Price off last cycle and you fail inspection, then reseal after the walls close. Confirm the code edition with the building department before you bid.<\/p>\n<\/li>\n<li>\n<h3>Not photographing walls before close-up<\/h3>\n<p>Once drywall goes up, every pipe, wire, and duct disappears. A later warranty call starts with what is behind the wall, and without photos the plumber cuts three holes to find one leak. Shoot every cavity before drywall, organized by room.<\/p>\n<\/li>\n<li>\n<h3>Skipping a formal punch list<\/h3>\n<p>By punch list, everyone is tired and tempted to call a walkthrough done. That earns sixty days of callbacks and dead referrals. Walk every room with a checklist, fix your list first, then walk it with the homeowner. The final draw rides on it.<\/p>\n<\/li>\n<\/ol>\n<h2>Estimate accurately with SimplyWise<\/h2>\n<p>Most of these mistakes trace back to a wrong number or a missing record. SimplyWise Cost Estimator turns a job site photo into an itemized estimate in about 6 seconds, so your bid stands on real quantities. <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\">Price the job from a photo<\/a>, then let the Receipt Scanner and Mileage Tracker document your real costs. Our <a href=\"https:\/\/www.simplywise.com\/blog\/how-to-bid-construction-job-guide\/\">guide to bidding a construction job<\/a> gets the first number right. It is free to try.<\/p>\n<p style=\"text-align:center;margin-top:28px;\"><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" style=\"display:inline-flex;align-items:center;gap:8px;padding:14px 24px;border-radius:8px;font-size:15px;font-weight:600;background:#2563eb;color:#fff;text-decoration:none;border:none\">Try SimplyWise free<\/a><\/p>\n<div class=\"sw-a__sources\">\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.nahb.org\/news-and-economics\/housing-economics-plus\/special-studies\/special-studies-pages\/cost-of-constructing-a-home-in-2024\" target=\"_blank\" rel=\"noopener\">National Association of Home Builders, Cost of Constructing a Home, 2024<\/a> (construction costs 64.4 percent of a new home&#8217;s sale price; builder profit 11.0 percent).<\/li>\n<li><a href=\"https:\/\/www.census.gov\/construction\/nrc\/current\/index.html\" target=\"_blank\" rel=\"noopener\">U.S. Census Bureau and HUD, Monthly New Residential Construction, May 2026<\/a> (housing starts at a 1,177,000 seasonally adjusted annual rate, 8.7 percent below May 2025).<\/li>\n<li><a href=\"https:\/\/www.bls.gov\/ooh\/management\/construction-managers.htm\" target=\"_blank\" rel=\"noopener\">U.S. Bureau of Labor Statistics, Occupational Outlook Handbook, Construction Managers<\/a> (median annual wage $106,980 in May 2024; jobs projected to grow 9 percent from 2024 to 2034).<\/li>\n<li><a href=\"https:\/\/www.irs.gov\/taxtopics\/tc305\" target=\"_blank\" rel=\"noopener\">Internal Revenue Service, Topic No. 305, Recordkeeping<\/a> (keep records that support income and expenses on a business return).<\/li>\n<\/ul>\n<\/div><\/div>\n<\/section>\n<section class=\"sw-a__pull\">\n<blockquote><p>\n    The mistakes that sink a custom home are never about skill. They are about the questions you ask before the shovel and the records you keep after.\n  <\/p><\/blockquote>\n<p>  <cite>SimplyWise Editorial<\/cite><br \/>\n<\/section>\n<section class=\"sw-a__faq\">\n<h2>Frequently asked questions about building custom homes<\/h2>\n<div class=\"sw-a__faq-list\">\n<h3 class=\"sw-a__faq-cat\">Pricing and margin<\/h3>\n<details>\n<summary>What profit margin should I expect on a custom home?<\/summary>\n<div class=\"sw-a__faq-answer\">\n<p>Watch the whole build, not the bid. The National Association of Home Builders puts average builder profit near 11 percent of the sale price, with construction costs eating roughly 64 percent. That thin margin is why three preventable overruns can erase a job&#8217;s profit.<\/p>\n<\/p><\/div>\n<\/details>\n<details>\n<summary>Should I use cost-plus or fixed-price contracts for custom homes?<\/summary>\n<div class=\"sw-a__faq-answer\">\n<p>Fixed-price sets the total upfront and puts the cost risk on you, which rewards tight estimating and a clean change order process. Cost-plus bills actual costs plus a fee and lowers your risk but demands full transparency. Unfinished plans lean cost-plus; complete plans lean fixed-price.<\/p>\n<\/p><\/div>\n<\/details>\n<h3 class=\"sw-a__faq-cat\">Managing the risk<\/h3>\n<details>\n<summary>What is the biggest financial risk on a custom home project?<\/summary>\n<div class=\"sw-a__faq-answer\">\n<p>Undocumented scope changes. Site prep surprises, material increases, and schedule slips are real, but they are quantifiable and manageable. Undocumented changes pile up silently, they are hard to recover at settlement, and they turn into disputes. A bulletproof change order process survives the rest.<\/p>\n<\/p><\/div>\n<\/details>\n<details>\n<summary>How much contingency should I carry on a custom home bid?<\/summary>\n<div class=\"sw-a__faq-answer\">\n<p>Most experienced custom builders carry five to ten percent contingency on the total, higher on hillside lots, unusual designs, and first-time clients. Some build it into individual line items instead of one lump sum for tighter control. Keep soil and site prep unknowns in their own contingency.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<\/section>\n<section class=\"sw-a__finalcta\">\n  <span class=\"sw-a__eyebrow\">Built for custom home builders<\/span><\/p>\n<h2>Build the house. Keep the profit.<\/h2>\n<p>Snap a job site photo, get an itemized estimate in about 6 seconds, and back every bid with documented costs. SimplyWise Cost Estimator is free to try, no credit card.<\/p>\n<div class=\"sw-a__cta-buttons\">\n    <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" style=\"display:inline-flex;align-items:center;gap:8px;padding:14px 24px;border-radius:8px;font-size:15px;font-weight:600;background:#2563eb;color:#fff;text-decoration:none;border:none\">Estimate From a Photo<\/a>\n  <\/div>\n<\/section>\n<\/article>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Article\",\n  \"headline\": \"10 Costly Mistakes Contractors Make Building Custom Homes\",\n  \"description\": \"The ten process mistakes that quietly eat a custom home builder's profit, from site prep to the punch list, and the exact move that prevents each one.\",\n  \"author\": {\"@type\": \"Organization\", \"name\": \"SimplyWise\"},\n  \"publisher\": {\"@type\": \"Organization\", \"name\": \"SimplyWise\", \"logo\": {\"@type\": \"ImageObject\", \"url\": \"https:\/\/simplywise.com\/logo.png\"}},\n  \"datePublished\": \"2026-07-13T09:00:00\",\n  \"dateModified\": \"2026-07-13T09:00:00\",\n  \"mainEntityOfPage\": {\"@type\": \"WebPage\", \"@id\": \"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/\"},\n  \"image\": \"https:\/\/images.unsplash.com\/photo-1704742950992-9815a104820c?w=960&q=80\"\n}\n<\/script><\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"ItemList\",\n  \"name\": \"10 Costly Mistakes Contractors Make Building Custom Homes\",\n  \"description\": \"Ten process mistakes that cost custom home builders the most money, and how to prevent each one.\",\n  \"numberOfItems\": 10,\n  \"itemListElement\": [\n    {\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Underestimating site prep\", \"description\": \"Custom homes sit on raw land, infill lots, and hillsides where rock, drainage, and trees hide expensive surprises, so walk every lot with your excavation sub and carry site prep as its own line with contingency.\"},\n    {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Skipping soil and geotechnical tests\", \"description\": \"Expansive clay or weak bearing soil can crack a slab within months and cost tens of thousands to repair, so make a geotechnical report non-negotiable on every custom home.\"},\n    {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Writing vague allowances into the contract\", \"description\": \"Spell out every allowance with a dollar amount, exactly what it covers, materials only or installed, and the unit, and make anything above it a signed change order.\"},\n    {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Not locking material prices\", \"description\": \"Prices move over an eight to fourteen month build, so get written quotes with a price lock for any category over a few thousand dollars and add an escalation clause on longer jobs.\"},\n    {\"@type\": \"ListItem\", \"position\": 5, \"name\": \"Poor subcontractor scheduling\", \"description\": \"A custom home runs fifteen to twenty-five trades where sequence is everything, so build a week-by-week schedule before breaking ground and update it weekly.\"},\n    {\"@type\": \"ListItem\", \"position\": 6, \"name\": \"Skipping the pre-construction meeting\", \"description\": \"Walk the plans page by page with the homeowner, architect, and key subs and lock the schedule, draws, change process, and selection deadlines before a dollar moves.\"},\n    {\"@type\": \"ListItem\", \"position\": 7, \"name\": \"A weak change order process\", \"description\": \"Every change, however small, gets a written order with scope, price, and schedule impact signed before work starts, backed by a running log.\"},\n    {\"@type\": \"ListItem\", \"position\": 8, \"name\": \"Ignoring energy code updates\", \"description\": \"Confirm the IECC edition in force with the building department before you bid and bake current insulation, air-sealing, and blower-door requirements into your specs.\"},\n    {\"@type\": \"ListItem\", \"position\": 9, \"name\": \"Not photographing walls before close-up\", \"description\": \"Photograph every wall cavity, ceiling, and penetration before drywall, organized by room, so warranty calls need one precise cut instead of exploratory holes.\"},\n    {\"@type\": \"ListItem\", \"position\": 10, \"name\": \"Skipping a formal punch list\", \"description\": \"Walk every room with a real checklist, fix your own list first, then walk it with the homeowner, since most contracts tie the final draw to punch list completion.\"}\n  ]\n}\n<\/script><\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\": \"Question\", \"name\": \"What profit margin should I expect on a custom home?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Watch the whole build, not the bid. The National Association of Home Builders puts average builder profit near 11 percent of the sale price, with construction costs eating roughly 64 percent. That thin margin is why three preventable overruns can erase a job's profit.\"}},\n    {\"@type\": \"Question\", \"name\": \"Should I use cost-plus or fixed-price contracts for custom homes?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Fixed-price sets the total upfront and puts the cost risk on you, which rewards tight estimating and a clean change order process. Cost-plus bills actual costs plus a fee and lowers your risk but demands full transparency. Unfinished plans lean cost-plus; complete plans lean fixed-price.\"}},\n    {\"@type\": \"Question\", \"name\": \"What is the biggest financial risk on a custom home project?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Undocumented scope changes. Site prep surprises, material increases, and schedule slips are real, but they are quantifiable and manageable. Undocumented changes pile up silently, they are hard to recover at settlement, and they turn into disputes. A bulletproof change order process survives the rest.\"}},\n    {\"@type\": \"Question\", \"name\": \"How much contingency should I carry on a custom home bid?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Most experienced custom builders carry five to ten percent contingency on the total, higher on hillside lots, unusual designs, and first-time clients. Some build it into individual line items instead of one lump sum for tighter control. Keep soil and site prep unknowns in their own contingency.\"}}\n  ]\n}\n<\/script><\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"BreadcrumbList\",\n  \"itemListElement\": [\n    {\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/www.simplywise.com\/\"},\n    {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Blog\", \"item\": \"https:\/\/www.simplywise.com\/blog\/\"},\n    {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Business & Growth\", \"item\": \"https:\/\/www.simplywise.com\/blog\/category\/business-growth\/\"},\n    {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"10 Costly Mistakes Contractors Make Building Custom Homes\", \"item\": \"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/\"}\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Blog &nbsp;&rsaquo;&nbsp; Business &amp; Growth Custom Homes &middot; Protect Your Margin 10 Costly Mistakes Contractors Make Building Custom Homes A tight field guide to the ten process mistakes that quietly eat a custom home builder&#8217;s profit, and the exact move that prevents each one. Sourced from Bureau of Labor Statistics and Census data. Start Estimating [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"building custom homes","_yoast_wpseo_title":"10 Costly Mistakes Building Custom Homes","_yoast_wpseo_metadesc":"The 10 costly mistakes contractors make building custom homes, from vague allowances to weak change orders, and how to protect your margin on every build.","_yoast_wpseo_linkdex":"75","_yoast_wpseo_content_score":"90","_yoast_wpseo_meta-robots-noindex":"","inline_featured_image":false,"footnotes":""},"categories":[182],"tags":[],"class_list":["post-5369","post","type-post","status-publish","format-standard","hentry","category-business-growth"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>10 Costly Mistakes Building Custom Homes<\/title>\n<meta name=\"description\" content=\"The 10 costly mistakes contractors make building custom homes, from vague allowances to weak change orders, and how to protect your margin on every build.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"10 Costly Mistakes Building Custom Homes\" \/>\n<meta property=\"og:description\" content=\"The 10 costly mistakes contractors make building custom homes, from vague allowances to weak change orders, and how to protect your margin on every build.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/\" \/>\n<meta property=\"og:site_name\" content=\"SimplyWise Cost Estimator\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-13T09:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-13T16:53:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/images.unsplash.com\/photo-1704742950992-9815a104820c?w=960&q=80\" \/>\n<meta name=\"author\" content=\"SimplyWise Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"SimplyWise Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"13 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/\"},\"author\":{\"name\":\"SimplyWise Team\",\"@id\":\"https:\/\/www.simplywise.com\/blog\/#\/schema\/person\/ec7b0ad4e4c69c23567bfaed332d4cbe\"},\"headline\":\"10 Costly Mistakes Every General Contractor Should Avoid When Building Custom Homes\",\"datePublished\":\"2026-07-13T09:00:00+00:00\",\"dateModified\":\"2026-07-13T16:53:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/\"},\"wordCount\":1294,\"publisher\":{\"@id\":\"https:\/\/www.simplywise.com\/blog\/#organization\"},\"articleSection\":[\"Business &amp; Growth\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/\",\"url\":\"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/\",\"name\":\"10 Costly Mistakes Building Custom Homes\",\"isPartOf\":{\"@id\":\"https:\/\/www.simplywise.com\/blog\/#website\"},\"datePublished\":\"2026-07-13T09:00:00+00:00\",\"dateModified\":\"2026-07-13T16:53:27+00:00\",\"description\":\"The 10 costly mistakes contractors make building custom homes, from vague allowances to weak change orders, and how to protect your margin on every build.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.simplywise.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"10 Costly Mistakes Every General Contractor Should Avoid When Building Custom Homes\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.simplywise.com\/blog\/#website\",\"url\":\"https:\/\/www.simplywise.com\/blog\/\",\"name\":\"SimplyWise Cost Estimator\",\"description\":\"Blog\",\"publisher\":{\"@id\":\"https:\/\/www.simplywise.com\/blog\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.simplywise.com\/blog\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.simplywise.com\/blog\/#organization\",\"name\":\"SimplyWise Cost Estimator\",\"url\":\"https:\/\/www.simplywise.com\/blog\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.simplywise.com\/blog\/#\/schema\/logo\/image\/\",\"url\":\"\",\"contentUrl\":\"\",\"caption\":\"SimplyWise Cost Estimator\"},\"image\":{\"@id\":\"https:\/\/www.simplywise.com\/blog\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.simplywise.com\/blog\/#\/schema\/person\/ec7b0ad4e4c69c23567bfaed332d4cbe\",\"name\":\"SimplyWise Team\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.simplywise.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/e095e95b38babf06f5dac21fa9d9a2d694b0e910a949fc88618b0190d40efd20?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/e095e95b38babf06f5dac21fa9d9a2d694b0e910a949fc88618b0190d40efd20?s=96&d=mm&r=g\",\"caption\":\"SimplyWise Team\"},\"description\":\"The SimplyWise team writes about construction estimating, contractor marketing, and running a profitable trade business.\",\"url\":\"https:\/\/www.simplywise.com\/blog\/author\/simplywise-team\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"10 Costly Mistakes Building Custom Homes","description":"The 10 costly mistakes contractors make building custom homes, from vague allowances to weak change orders, and how to protect your margin on every build.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/","og_locale":"en_US","og_type":"article","og_title":"10 Costly Mistakes Building Custom Homes","og_description":"The 10 costly mistakes contractors make building custom homes, from vague allowances to weak change orders, and how to protect your margin on every build.","og_url":"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/","og_site_name":"SimplyWise Cost Estimator","article_published_time":"2026-07-13T09:00:00+00:00","article_modified_time":"2026-07-13T16:53:27+00:00","og_image":[{"url":"https:\/\/images.unsplash.com\/photo-1704742950992-9815a104820c?w=960&q=80"}],"author":"SimplyWise Team","twitter_card":"summary_large_image","twitter_misc":{"Written by":"SimplyWise Team","Est. reading time":"13 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/#article","isPartOf":{"@id":"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/"},"author":{"name":"SimplyWise Team","@id":"https:\/\/www.simplywise.com\/blog\/#\/schema\/person\/ec7b0ad4e4c69c23567bfaed332d4cbe"},"headline":"10 Costly Mistakes Every General Contractor Should Avoid When Building Custom Homes","datePublished":"2026-07-13T09:00:00+00:00","dateModified":"2026-07-13T16:53:27+00:00","mainEntityOfPage":{"@id":"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/"},"wordCount":1294,"publisher":{"@id":"https:\/\/www.simplywise.com\/blog\/#organization"},"articleSection":["Business &amp; Growth"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/","url":"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/","name":"10 Costly Mistakes Building Custom Homes","isPartOf":{"@id":"https:\/\/www.simplywise.com\/blog\/#website"},"datePublished":"2026-07-13T09:00:00+00:00","dateModified":"2026-07-13T16:53:27+00:00","description":"The 10 costly mistakes contractors make building custom homes, from vague allowances to weak change orders, and how to protect your margin on every build.","breadcrumb":{"@id":"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.simplywise.com\/blog\/costly-mistakes-building-custom-homes\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.simplywise.com\/blog\/"},{"@type":"ListItem","position":2,"name":"10 Costly Mistakes Every General Contractor Should Avoid When Building Custom Homes"}]},{"@type":"WebSite","@id":"https:\/\/www.simplywise.com\/blog\/#website","url":"https:\/\/www.simplywise.com\/blog\/","name":"SimplyWise Cost Estimator","description":"Blog","publisher":{"@id":"https:\/\/www.simplywise.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.simplywise.com\/blog\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.simplywise.com\/blog\/#organization","name":"SimplyWise Cost Estimator","url":"https:\/\/www.simplywise.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.simplywise.com\/blog\/#\/schema\/logo\/image\/","url":"","contentUrl":"","caption":"SimplyWise Cost Estimator"},"image":{"@id":"https:\/\/www.simplywise.com\/blog\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.simplywise.com\/blog\/#\/schema\/person\/ec7b0ad4e4c69c23567bfaed332d4cbe","name":"SimplyWise Team","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.simplywise.com\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/e095e95b38babf06f5dac21fa9d9a2d694b0e910a949fc88618b0190d40efd20?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/e095e95b38babf06f5dac21fa9d9a2d694b0e910a949fc88618b0190d40efd20?s=96&d=mm&r=g","caption":"SimplyWise Team"},"description":"The SimplyWise team writes about construction estimating, contractor marketing, and running a profitable trade business.","url":"https:\/\/www.simplywise.com\/blog\/author\/simplywise-team\/"}]}},"_links":{"self":[{"href":"https:\/\/www.simplywise.com\/blog\/wp-json\/wp\/v2\/posts\/5369","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.simplywise.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.simplywise.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.simplywise.com\/blog\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.simplywise.com\/blog\/wp-json\/wp\/v2\/comments?post=5369"}],"version-history":[{"count":12,"href":"https:\/\/www.simplywise.com\/blog\/wp-json\/wp\/v2\/posts\/5369\/revisions"}],"predecessor-version":[{"id":7586,"href":"https:\/\/www.simplywise.com\/blog\/wp-json\/wp\/v2\/posts\/5369\/revisions\/7586"}],"wp:attachment":[{"href":"https:\/\/www.simplywise.com\/blog\/wp-json\/wp\/v2\/media?parent=5369"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.simplywise.com\/blog\/wp-json\/wp\/v2\/categories?post=5369"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.simplywise.com\/blog\/wp-json\/wp\/v2\/tags?post=5369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}