How to Bid a Construction Job: The Complete Guide for Contractors
From reading plans to presenting your number, a step-by-step breakdown of how to put together bids that win work and protect your profit.
The Bid That Changed Everything
You are sitting in your truck after a walkthrough, staring at a set of plans spread across the passenger seat. The homeowner wants a full kitchen remodel, demo to finish. They have already gotten two other bids. You know you can do the work. But putting together a number that wins the job without leaving money on the table? That is where most contractors either get it right or learn an expensive lesson.
Bidding is where the business side of contracting really lives. You can be the best framer, electrician, or plumber in your market, but if your bids are sloppy, incomplete, or priced wrong, you will either lose the job or win it and wish you had not.
This guide walks through the entire bidding process, from picking up plans to the follow-up after you submit your number. Every step is practical and based on how working contractors actually bid jobs in the field.
Contractors who use structured estimating processes win significantly more bids at higher margins than those who rely on gut-feel pricing. A repeatable system is not just about accuracy. It is about consistency.
Step 1: Reading Plans and Specifications
Before you sharpen a single pencil or open a spreadsheet, you need to understand what you are actually bidding on. Rushing through plans is the number one source of estimating errors. A missed detail on page 12 of the specs can cost you thousands.
What to look for in the plans
- Scope of work: What exactly are you responsible for? On a GC bid, that is everything. On a sub bid, your scope needs to be crystal clear.
- Dimensions and quantities: Wall lengths, ceiling heights, square footage, linear feet of trim. These numbers drive your material takeoff.
- Material specifications: “Tile” is not the same as “12×24 porcelain rectified tile with 1/16 grout joints.” Know the difference before you price it.
- Structural details: Load-bearing walls, header sizes, footing depths. Structural requirements change labor hours and material costs significantly.
- Notes and addenda: The small text in the margins and any addenda issued after the original plans are where critical details hide. Read every word.
Print the plans at full scale if possible. Measuring off a phone screen introduces errors. If you work from digital plans, use a calibrated PDF viewer so your scale measurements are accurate.
Step 2: The Site Visit and Material Takeoff
Plans tell you what the project is supposed to look like. The site visit tells you what you are actually dealing with. Never bid a job you have not walked.
What to evaluate during the walkthrough
- Access: Can your trucks get in? Is there room for a dumpster? Tight access means more labor hours for material handling.
- Existing conditions: On renovation work, what is behind those walls? Older homes often have surprises that the plans do not show.
- Demolition scope: Asbestos, lead paint, or mold can change your demo costs dramatically.
- The client: Are they organized? Do they already know what they want, or will they change their mind six times? A difficult client costs you time.
Take photos of every room, every wall, every existing condition that could affect your bid. These photos become your reference back at the office and your evidence if the client later claims something was already damaged. Tools like SimplyWise let you snap photos on-site and immediately generate preliminary cost estimates, giving you a digital record with cost data attached.
The material takeoff
The takeoff is where you count every piece of lumber, every sheet of drywall, every box of tile. This is the foundation of your bid. Get it wrong and everything built on top of it is wrong too.
Work through each trade systematically. Do not jump around. Pick a system like framing, count everything in that system, then move to the next. Never order exact quantities. Standard waste factors range from 5% to 15% depending on the material and complexity of installation.
A 10% error in your takeoff becomes a 10% error in your materials cost. On a $50K job, that means $5,000 you either left on the table or are paying out of pocket. Measure twice, count twice, then add your waste factor.
Step 3: Estimating Labor
Labor is typically 40-60% of a construction project’s total cost, making it the single largest variable in your bid.
Production rates
Every task has a production rate: the amount of work one person or crew can complete in one hour or day. Here are some common residential baselines:
| Task | Unit | Production Rate |
|---|---|---|
| Framing interior walls | Linear foot | 15-25 LF per carpenter per hour |
| Hanging drywall | Sheet (4×8) | 8-12 sheets per person per day |
| Interior painting (2 coats) | Square foot | 200-350 SF per painter per day |
| Tile installation (floor) | Square foot | 40-80 SF per installer per day |
| Rough plumbing | Fixture | 2-4 fixtures per plumber per day |
The best estimators track their actual production rates on past jobs and use those numbers for future bids.
Fully burdened labor rates
Do not use your crew’s hourly wage as your labor cost. The actual cost includes payroll taxes, workers’ comp, general liability, benefits, and PTO. A carpenter earning $35 per hour might actually cost you $48-55 per hour when fully burdened.
Build a contingency into your labor estimate: 5-10% for straightforward remodels and 10-15% for older homes or complex renovations. This is not padding. It is realistic planning.
Step 4: Overhead and Profit Markup
Calculating overhead
Overhead is every cost of running your business that is not directly tied to a specific job: truck payments, insurance, office rent, phone, tools, marketing, licenses, and your own time when you are not on a job site.
Add up all your overhead costs for the year and divide by your total expected revenue. If your annual overhead is $120,000 and you expect $600,000 in revenue, your overhead rate is 20%. Most small to mid-size contractors run between 15% and 30%.
Setting your profit markup
Overhead covers the cost of running the business. Profit is what you earn for taking the risk and delivering quality work. They are not the same thing.
- Markup is the percentage added to your costs. If your costs are $40,000 and you add 25% markup, your price is $50,000.
- Margin is the percentage of the selling price that is profit. In that example, $10,000 profit on $50,000 is a 20% margin.
Typical profit margins by trade
| Trade / Project Type | Typical Net Profit Margin |
|---|---|
| General contracting (new construction) | 3-7% |
| General contracting (remodeling) | 8-12% |
| Electrical | 8-15% |
| Plumbing | 10-18% |
| HVAC | 10-20% |
| Painting | 15-25% |
| Roofing | 10-20% |
Many contractors underestimate overhead because they forget to count their own time. If you spend 2 hours a day on estimating, scheduling, purchasing, and client communication, that is 500+ hours a year of unbillable time that needs to be covered.
Step 5: Putting It All Together — a Sample $50K Kitchen Remodel Bid
Here is a mid-range kitchen remodel for a 150-square-foot kitchen: full gut to studs, new layout with island, semi-custom cabinets, quartz countertops, tile backsplash, hardwood flooring, all new appliances (supplied by homeowner), updated plumbing and electrical.
| Category | Details | Cost |
|---|---|---|
| Demolition | Gut existing kitchen, haul debris (1 dumpster) | $2,800 |
| Framing | Move one non-load-bearing wall, frame island, patch subfloor | $1,900 |
| Electrical | New circuits for island, under-cabinet lighting, 14 devices, panel upgrade | $4,200 |
| Plumbing | Relocate sink to island, new supply/drain lines, gas line for range | $3,800 |
| HVAC | Extend ductwork for modified layout, 1 new register | $1,200 |
| Insulation and drywall | Insulate exterior wall, hang and finish drywall throughout | $2,600 |
| Cabinets | Semi-custom, soft-close, 20 LF base + 16 LF upper + island | $9,500 |
| Countertops | Quartz, 45 SF including island, undermount sink cutout | $4,200 |
| Backsplash | Subway tile, 30 SF, including grout and setting materials | $1,400 |
| Flooring | Engineered hardwood, 150 SF including transitions | $2,400 |
| Paint | Walls, ceiling, trim, 2 coats, primer | $1,600 |
| Fixtures and hardware | Faucet, sink, cabinet hardware, light fixtures | $2,100 |
| Permits | Building, electrical, plumbing | $800 |
| Subtotal (Direct Costs) | $38,500 | |
| Overhead (20%) | $7,700 | |
| Profit (10%) | $4,620 | |
| Total Bid Price | $50,820 | |
Every number has a basis. Nothing is a guess. You can explain and defend each line item if the client asks, because the estimates are grounded in real material counts and real production rates.
This sample assumes appliances are owner-supplied. Sub costs (electrical, plumbing, HVAC) include both labor and materials. Your overhead and profit still apply on top of sub costs because you are managing, coordinating, and taking responsibility for their work.
Step 6: Presenting Your Bid
How you present the bid matters almost as much as the number. A well-organized, professional bid builds trust. A sloppy estimate on a napkin tells the client you will run the job the same way.
What to include in your bid document
- Cover page: Company name, logo, license number, contact info, project address, date.
- Scope of work: Detailed description broken down by phase or trade. Be specific.
- Exclusions: What is NOT included. If you do not exclude it explicitly, the client will assume it is included.
- Payment schedule: A standard residential schedule might be 10% deposit, 30% at rough-in, 30% at drywall/cabinets, 25% at completion, 5% at final walkthrough.
- Timeline: Estimated start, duration, and completion date, contingent on permits and material lead times.
- Expiration date: Material prices fluctuate. Your bid should be valid for 30 days, maybe 60.
Deliver the bid in person whenever possible. Walk the client through each section. The contractor who explains the bid face-to-face wins more often than the one who emails a PDF and hopes for the best.
Step 7: Common Mistakes and the Follow-Up
Mistakes that cost real money
- Underbidding to win the job: A job won at the wrong price is worse than a job lost. You still have to deliver quality work, but now without a margin of error.
- Forgetting your own time: You spent 6 hours estimating. You will spend 2 hours a day managing the project. If that time is not in your overhead, you are working for free.
- Ignoring material price volatility: Lumber can swing 20-30% in months. Include a material escalation clause or bid expiration date.
- Not qualifying the lead: If their budget is $25,000 and the job clearly costs $50,000, you are wasting your time writing a bid they cannot afford.
- Sloppy scope definitions: “Install new flooring” is vague. “Install 150 SF of 5-inch engineered hardwood, natural oak finish, including removal of existing vinyl, moisture barrier, and quarter-round trim” is clear.
The follow-up strategy
- Day 2-3: Quick call or text. “Just wanted to make sure you received the estimate and see if you have any questions.”
- Day 7: Follow up again. Ask if they are comparing bids and if there is anything you can clarify.
- Day 14: Final follow-up. “Our schedule is filling up for [month]. If you want to lock in a start date, let me know.”
Win or lose, track every bid: job type, amount, outcome, and why. Over time, this data tells you which job types are most profitable and where to focus your efforts.
A good bid is not the lowest number. It is the right number, backed by solid takeoffs, realistic labor estimates, accurate overhead, and fair profit. Master this process and you will never wonder where the next job is coming from.
Frequently Asked Questions
Bid Faster, Win More
Get a preliminary estimate from a photo in about 6 seconds, then refine with your own numbers. SimplyWise helps you turn around professional, accurate bids faster so you can focus on winning work.