Site Plan in Construction: What to Check

What is on a site plan?

Think of a scaled view from above the property. It shows where work sits and how it connects to the street. Read the labels before measuring anything. Check the address, sheet date, revision, scale, and north arrow first.

Do not use a fence as proof of the lot edge. If the drawing and field conditions disagree, stop and ask. Keep the answer with the bid notes.

Then look for these details:

• Lot edges: boundary lengths, easements, and distances from buildings to property lines.
• Buildings: existing footprints, new work, and structures that will come down.
• Access: streets, driveways, paths, and entry points.
• Ground: slopes, proposed levels, drainage routes, and retaining walls.
• Services: water, sewer, and other utility routes or connection points.
• Protection: trees and features the crew must keep.

Portland’s drawing guide covers these subjects. Use it as an example of detail, then get your own local checklist. Find plain definitions in the construction glossary.

Site plan vs plot plan

The names can overlap. A plot plan often focuses on property lines and building locations. A more detailed site drawing can also show grading, drainage, utilities, and new work.

Ask what the sheet contains instead of relying on its title. A layout drawing alone does not prove a boundary. For quantity work, see what a construction takeoff includes.

Who draws the layout?

Start with the project scope. A designer or architect may prepare the layout. A civil engineer may handle drainage, grading, and utility design. A land surveyor establishes the boundary information the design needs.

Ask the permit office who may prepare your sheets and whether a seal is needed. Do not assume a homeowner sketch meets every review need. If property lines are unclear, resolve them before setting out the work.

When do you need a site plan?

Check before pricing a new building, addition, driveway, or major yard work. The local office decides what your submission must include. Requirements depend on the project and location.

Describe the work and ask for the current checklist. Confirm whether interior work also needs a lot drawing. Ask about trees, slopes, easements, and drainage reviews. Record who supplies each sheet and who pays for revisions.

How does the drawing affect your estimate?

The building footprint is only part of the job. A narrow entry can change equipment choices and material handling. A slope can add earthwork, hauling, or retaining work. Long utility routes can add trenching and surface repair.

List these items separately so the client can see the scope. Use the foundation estimating guide for work below the building. For earthwork, compare the workflow in estimating tools for excavation.

For example, a rear addition may need access through a narrow side yard. Confirm equipment access before assuming machine excavation. Name any hand digging, protection, hauling, and path repair in the quote. Price each item from measured quantities and supplier quotes.

Keep allowances clear. Name the work they cover and explain what will fix the final price. Avoid a broad site-work allowance that hides several unknown tasks. Record the drawing date on the quote so everyone knows the basis of your price.

Once the scope is clear, try SimplyWise Cost Estimator free to draft editable estimate lines.

Read a site plan before you price the work

1. Confirm the current sheet

   Match the address and revision to the bid request. Ask which drawing controls if sheets disagree.

2. Trace the crew’s route

   Follow access from the street to the work area. Check delivery space, storage, and features to protect.

3. Mark missing details

   List unclear levels, utility routes, and boundary information. Ask the designer for answers before fixing the price.

4. Write the scope into the quote

   Name included work, exclusions, and assumptions. Use the construction bidding guide to organize the offer.

Next, put access work and utility coordination into the job sequence. See how to create a construction schedule before setting the start date.

SimplyWise Cost Estimator for the quote

SimplyWise Cost Estimator turns a photo into an itemized estimate in about 6 seconds. Review material, labor, and fee lines against your confirmed scope. Then send a professional, branded quote the client signs to approve. Start your quote, free to try.

Keep reading

• Construction terms in plain language
• Build a quantity takeoff
• Plan the construction sequence