How to write a contractor estimate that wins the job
A contractor estimate wins the job when the client can read it once and know what you will do, what it costs, what is not included, when you start and when you get paid. Walk the site first, write the scope in plain words, price labor and materials on separate lines, and get a signature before you order anything. Below: the steps, a worked example with the arithmetic, and a checklist.
Walk the site and ask before you price
Take photos and measurements, and ask these questions. Write the answers on the estimate so both of you can see them later.
- What do you want done, and what matters most besides the price?
- Who picks the fixtures and finishes, and have they been picked yet? The answer decides what becomes an allowance.
- When was the building built? In the US, paid work that disturbs paint in homes built before 1978 falls under the EPA lead-safe rule, and firms must be certified, even one-person firms. Check the EPA page before you price such a job.
- Is there a date it must be finished by? When can you get in, and who will be home?
- Where are the water shut-off and the electrical panel? Where can you park and store materials?
- Does it need a permit, and who will get it? Put the answer in writing.
A visit cannot show what is behind a wall or under a floor. Write down what you could not see. It goes in the exclusions.
Write the scope and the exclusions in plain words
The FTC tells clients that a written estimate should include a description of the work, the materials, the completion date and the price. Write the work as short steps the client can check. For a sink swap:
- Remove the old sink, faucet and drain.
- Install the sink and faucet the client picks.
- Connect to the existing shut-off valves and drain line.
- Test for leaks, clean up and haul away the old sink.
Say what kind of price this is. Estimate, quote and bid mean different things in different places, so add one sentence: "Fixed price for the work listed" or "Best guess; I will tell you why, and ask first, if it goes up."
Then list what is not included. An extra that nobody wrote down is the one people argue about. Typical lines: hidden damage found once a wall or floor is open; permit fees unless listed; painting and wall repair after the job; any work not listed above. If you promised something out loud, write it down or take it back. The FTC tells clients to put spoken promises about scope and cost into the contract.
Itemize labor, materials and allowances
- Labor: hours x rate, or a flat price per task. Pick one way and use it on every estimate.
- Materials: item, quantity, unit price. Add what you expect to lose to cuts and breakage.
- Other lines: trip or call-out fee, disposal, delivery, permit fees. Each gets its own line.
- Markup: build it into the unit price. Do not add a surprise line at the end.
Clear lines help you. The FTC tells clients not to pick the lowest bidder automatically and to ask for an explanation when estimates differ a lot. Your lines are that explanation.
An allowance is a placeholder amount for something the client has not chosen yet, such as a faucet or tile. A remodeling trade magazine describes it as an amount set from facts and experience that should match the quality the client expects. Write what it covers. If the client picks something dearer, the difference is added by change order. If cheaper, it is subtracted. A low allowance makes your price look good and your final bill look bad.
Worked example: replace a bathroom sink and faucet
Invented numbers, so you can check the sums. Estimate 1042, dated Nov 3, valid until Dec 3. Start Nov 16 if the parts have arrived, finish within 2 working days of the start. The client picks the sink and faucet, so both are allowances.
| Line | Qty x price | Amount |
|---|---|---|
| Labor: remove old sink and faucet, install and test new ones | 4 h x 85.00 | 340.00 |
| Allowance: sink (vanity top with built-in bowl) | 1 x 180.00 | 180.00 |
| Allowance: faucet | 1 x 120.00 | 120.00 |
| Braided supply lines | 2 x 12.00 | 24.00 |
| Drain kit (P-trap and tailpiece) | 1 x 16.00 | 16.00 |
| Sealant, tape, small parts | 1 x 10.00 | 10.00 |
| Haul away old sink and packaging | 1 x 30.00 | 30.00 |
| Subtotal | 720.00 | |
| Sales tax, 6% on materials only (350.00 x 0.06) | 21.00 | |
| Total | 741.00 | |
| Deposit on acceptance (10% of 741.00) | 74.10 | |
| Balance due on completion (741.00 - 74.10) | 666.90 |
Tax name and rate come from your area. Six percent on materials only is just for this example. The deposit is 10 percent, which stays under a cap like California's.
Offer a second price when there is a real reason. Better: also replace the two old shut-off valves, because old valves can stick or leak once they are turned. Valves: 2 x 18.00 = 36.00. One more hour of labor: 85.00. Tax on the valves: 36.00 x 0.06 = 2.16. Added: 36.00 + 85.00 + 2.16 = 123.16. Better total: 741.00 + 123.16 = 864.16. Show both totals and let the client tick one. The better option should fix a real problem, not pad the bill.
Dates, how long the price holds, deposit and payments
- Dates: an estimated start and an estimated finish, as the FTC lists for a contract. Write what can move them: parts delivery, weather, access.
- Validity: write an end date, "valid until Dec 3", not "a few weeks". Match it to how long your supplier holds its prices. If the supplier's price lasts 7 days, do not promise 30.
- Deposit: ask for enough to cover what you must buy before you start, and no more than local rules allow. California caps a home improvement down payment at $1,000 or 10 percent of the price, whichever is less, with no exception for special-order materials. The FTC says other states limit it too.
- Payments: for a small job, deposit plus balance on completion. For a longer job, tie each payment to finished work. California's rule says payments cannot exceed the value of the work performed. Expect clients to hold the last payment until the work is done, as the FTC advises them.
- Signing at the client's home: the FTC says the contract should carry a written notice of the right to cancel within three business days when it is signed in the client's home or away from your usual place of business. Check how this applies to you before you order special parts.
Change orders and follow-up
Any change to the work or the price is written down and signed by both of you before the extra work starts. California's licensing board states it that way. Four lines are enough:
Change order 1 | Estimate 1042
Added: replace 2 ft of corroded drain pipe found behind the vanity
Labor 1.5 h x 85.00 = 127.50 | Parts 22.00 | Tax 6% on parts 1.32
Added price 150.82 | New total 891.82 | Finish date unchanged
Signed: client ________ contractor ________ date ________Send the estimate the same day and ask when the client expects to decide. If you hear nothing, send one short question after a day or two ("Does anything on the page need explaining?") and one note a few days before the price runs out. Then stop. No research sits behind exact day counts, so choose a routine you will really keep. If the client says someone else is cheaper, offer to go through the lines. Do not cut the price first.
Turn the accepted estimate into an invoice
Keep the lines and prices. Put the estimate number on the invoice, add each signed change order as its own line, subtract the deposit, and show the balance, the due date and how to pay. Never change a price on the invoice that is not on a signed change order.
Invoice 2087 | Estimate 1042 and Change order 1
Estimate 1042, accepted Nov 5 741.00
Change order 1, drain pipe 150.82
Total 891.82
Deposit received Nov 5 -74.10
Balance due on completion 817.72An invoice maker on your PC that turns an estimate into an invoice in one step saves retyping, and the free templates linked below do the job by hand. Keep the signed estimate, the change orders and the invoice in one folder.
License, contract and lien rules: check them where you work
These rules differ by state, county and country, and they change. This guide is general information, not legal or tax advice. A good estimate lowers the chance of a dispute. It does not remove it.
- License: whether you need one, and for which job sizes, depends on where you work. Ask your licensing board. The FTC and California's board both list the contractor's license number among the contract details, so write yours on the estimate if one applies.
- Written contract: California requires one for home improvement work over $500. The FTC says to get a written agreement even where your state does not require one.
- Liens: the right to put a lien on a property for unpaid work comes from state statutes, so notices and deadlines differ by state. Learn them before the job starts, not after a client stops paying.
- Tax: ask your accountant which tax applies to labor and to materials where you work.
Checklist: what to write and why
| Section | What to write | Why it matters |
|---|---|---|
| Header | Business name, license number if one applies, client, job address, estimate number, date | The client can find you, and you can find the file |
| Scope | The work in short steps, one sentence each | Both sides picture the same job |
| Price type | Fixed price or best guess, and what can change it | Estimate and quote mean different things in different places |
| Labor and materials | Hours x rate or flat price; item, quantity, unit price | Clients compare estimates and ask about gaps |
| Allowances | What each covers, how overage and credit work | No surprise on the final bill |
| Not included | Hidden damage, permits, repairs after the job | An unwritten extra becomes an argument |
| Options | A good and a better total, with the reason | A choice that is not yes or no |
| Dates | Estimated start and finish, what can move them | Sets expectations |
| Validity | An end date for the price | Material prices change |
| Deposit and payments | Amount, when due, stage payments | Pays for materials; local caps may apply |
| Changes | Changes are agreed in writing before the work | Stops scope creep |
| Acceptance | Client signature and date | Proof that they agreed |
Questions
What should a contractor estimate include?
Your business details, the client and job address, a plain description of the work, labor and materials with prices, what is not included, start and finish dates, how long the price holds, the deposit and payment schedule, and a signature line.
Is a contractor estimate legally binding?
It depends on the wording and on local law. Say in writing whether the price is fixed or a best guess and what can change it. A signed estimate may become part of the contract. Ask your licensing board or a local lawyer if you are unsure.
How long should an estimate be valid?
There is no standard length. Match it to how long your supplier holds its prices, write the end date on the estimate, and shorten it when material prices are moving.
How much deposit can a contractor ask for?
It depends on where you work. Some states limit it. In California, a home improvement down payment is capped at $1,000 or 10 percent of the price, whichever is less. Check your own state's rule.
Should I charge for an estimate?
That is your choice. If you charge, say so before the visit and say whether the fee comes off the price if the client hires you.
How do I turn an estimate into an invoice?
Copy the accepted lines, add each signed change order as its own line, subtract the deposit, and show the balance due with the estimate number.
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About Wrenvik
Wrenvik is our Windows app for making estimates and invoices for your trade and saving them as PDF. Your clients and prices are stored on your PC. It helps you write documents and does not give tax or legal advice. It is not in the Microsoft Store yet.
Sources
- FTC: How To Avoid a Home Improvement Scam (July 2022)
- California CSLB: Learn About Home Improvement Contracts
- US EPA: Lead Renovation, Repair and Painting Program (updated June 17, 2026)
- Pro Remodeler: The Lowdown on Calculated Allowances (2016)
- Cornell Legal Information Institute: construction lien
Checked 2026-11-03.
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