How to Write a Construction Proposal

How do you write a construction proposal? Start with a short cover letter, then define the scope of work by phase or trade. List the materials and specifications, and give a line-item cost breakdown with a clear total. Add the schedule, payment terms, warranty, change-order rules, and exclusions. Close with your credentials and a signature block so the owner can accept the bid on the spot.

A construction proposal does two jobs. It sells the owner on you, and it sets the terms you will build under. A vague proposal may win the job, but it causes disputes later. A clear one wins on trust and protects your margin when the scope changes.

This guide covers what to include, the section order, how to price it, a worked example, and the mistakes that cost contractors bids and money. If you want a ready layout, the construction proposal template has every section below already designed.

What to include in a construction proposal

Section	What it covers
Cover page	Project name, address, client, bid date, duration, and total bid
Cover letter	Who you are, what you reviewed, the price, how long the price holds
Scope of work	The work by phase or trade, in plain terms
Materials and specifications	Products, grades, and finishes; allowances for owner-selected items
Cost breakdown	Line items with labor and materials, plus permits, overhead, and contingency
Schedule	Phases over time and key milestones, with owner decisions noted
Terms	Payment schedule, retainage, warranty, change orders, delays, insurance
Exclusions	What is not in the price
Credentials	License numbers, bonding, insurance, and comparable past projects
Acceptance	Signature lines for both parties and the deposit due on signing

Our construction bid template follows this order. Its sample is a commercial office build-out: a cover with the lump-sum bid, a cover letter, a four-phase scope (demolition, framing, MEP, finishes), a materials page with spec codes and an allowance table, and a cost breakdown by CSI division. It also has a 14-week schedule chart, a progress-payment table with retention, an exclusions list, a credentials page, and an acceptance page.

Step-by-step: how to write one

1. Walk the site and read the documents

Before you price anything, walk the site and read the drawings or the client's brief. Note what you saw and which documents you priced from, with dates. Put that in the cover letter. It shows care, and it fixes the basis of your price if the drawings change later.

2. Write the scope by phase or trade

Break the job into phases (demolition, framing, mechanical, finishes) or trades. Under each, list the work in short, specific lines. "Install new drywall" is vague. "Level 4 finish drywall throughout; moisture-resistant board at wet walls" is a scope you can be held to, and so can the owner.

3. Specify materials and allowances

Name products and grades where you can. Where the owner has not chosen yet (appliances, fixtures, tile), carry an allowance: a fixed amount in the price, reconciled at the end. State that substitutions need written approval.

4. Build the cost breakdown

Price each line item for labor and materials. Then add the indirect costs: permits, general conditions (supervision, dumpsters, temporary facilities), insurance or bonding, and contingency. Show a clear total. Owners trust line items more than a single number, and line items make change orders easier to price.

5. Set the schedule

Show the phases over weeks and list key milestones. Note what the owner must do and when, such as final allowance selections. Most schedule disputes start with an owner decision that came late.

6. Write the terms

Cover the payment schedule, retainage (if any), warranty period, how change orders work, what counts as an excusable delay, and your insurance. Payment rules, deposit limits, retainage, and lien notices vary by state and country, so check local law before you set them.

7. List exclusions and add credentials

Exclusions prevent most arguments. List what is not included, such as furniture, data cabling, hazardous material beyond what was tested, or structural work. Then show license numbers, insurance limits, and 3-4 comparable projects.

8. Close with an acceptance page

Add a short statement that the signer accepts the scope, schedule, and price, and how long the offer is valid. Include signature and date lines for both parties and the deposit due on signing.

A worked example

The company, client, and numbers below are invented for illustration.

Oakline Builders is bidding on a kitchen remodel for the Patel family: remove the old kitchen, move the sink to an island, install new cabinets and quartz counters, and replace the flooring. Duration: 6 weeks.

Line item	Amount
Demolition and disposal	$3,200
Framing and drywall	$4,800
Plumbing (sink relocation to island)	$6,500
Electrical (island circuits, under-cabinet lighting)	$5,900
Cabinets and quartz countertops (includes $9,000 cabinet allowance)	$21,400
Flooring (LVP, 320 sq ft)	$5,600
Paint and finish carpentry	$2,700
Direct cost of work	$50,100
Permits	$1,200
Supervision and site costs	$4,000
Contingency (about 5%)	$2,700
Total bid	$58,000

Payment schedule:

Payment	Trigger	Share	Amount
Deposit	Signed contract	10%	$5,800
Draw 1	Plumbing and electrical rough-in passes inspection	30%	$17,400
Draw 2	Cabinets and counters installed	30%	$17,400
Final	Punch list signed off	30%	$17,400

Exclusions: appliances, window treatments, any work outside the kitchen, and repair of hidden damage found behind walls (priced by change order). Valid for 30 days.

Note that some places cap residential deposits, so Oakline would check its local rules before it sends this.

Common mistakes

A single lump-sum number with no breakdown. Owners compare bids line by line. A bare total looks like a guess.
Vague scope. "Remodel kitchen" invites the owner to expect more than you priced.
No exclusions. If it is not excluded in writing, the owner may assume it is included.
No change-order clause. Say that changes need a signed change order before work starts, and how you price them.
No validity date. Material prices move. State how long the price holds.
Hard-to-read layout. A cramped spreadsheet export looks less professional than a clean document, even at the same price.

How long should a construction proposal be?

Length follows the job. A small residential job may fit in 2-4 pages: scope, price, terms, and signature. A commercial bid is often 8-15 pages or more, with specifications, a schedule chart, and credentials. Keep the price easy to find: put the total on the cover and in the cover letter.

Send it as a PDF so the tables and signature page stay intact on any device. For layout basics, see how to design a professional PDF. If you draft in Word today, moving from Word or Google Docs to a professional PDF covers the switch.

Write it with BuildPDFs

BuildPDFs turns a short description of the job into a finished proposal. Describe the project, the scope, your line-item prices, and your terms. The AI drafts the full bid on the construction proposal template, with the cover letter, scope by phase, cost tables, schedule, and acceptance page. You edit any section in plain language, then export a print-ready PDF. You can also start from the AI business proposal generator.

FAQ

What is the difference between a construction proposal, an estimate, and a bid?

An estimate is an approximate cost. A bid is a firm price offered for defined work, often in competition with other contractors. A proposal is the full document around the price: scope, schedule, terms, and credentials. In practice, many contractors use "bid" and "proposal" for the same document.

How much contingency should a construction proposal include?

It depends on the job and how much is unknown. Many contractors carry a small percentage of direct cost, often in the single digits for well-defined work and higher for renovations with hidden conditions. State the contingency and how unused amounts are handled.

Is a signed construction proposal a contract?

It can be, depending on its wording and local law. Many proposals say the signed proposal becomes part of a separate formal contract. If the stakes are high, have a lawyer review your terms.

What is retainage?

Retainage is a share of each payment the owner holds back until the job is complete, to make sure the work gets finished. A 5-10% hold is common on commercial work. Rules on retainage vary by location, so check local law.

How to Write a Construction Proposal (Sections, Pricing, and an Example)