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Ask each bidder to explain unusual price differences. Have the selected contractor put the final scope, materials, schedule, total price, payment terms and written change-order procedure in a signed contract. Tax, permit and consumer-protection rules depend on your location and project, so verify local requirements before signing.
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How do I compare contractor estimates?
Start with two or more written estimates based on identical information. Several public agencies suggest obtaining three estimates as a practical safeguard, but there is no universal legal requirement to get exactly three. The Iowa Attorney General and the Federal Trade Commission (FTC) both emphasize written, comparable proposals. A low number is not a bargain if it leaves out labor, products, disposal or required work.
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The FTC says, “A written estimate should include a description of the work to be done, materials, completion date, and the price.” Treat that as the starting point, not the whole comparison. Read every page, attachment, allowance and exclusion.
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1. Freeze the scope before requesting prices
Prepare one scope document for every bidder. Describe dimensions, quantities, demolition, removal, disposal, site access, finish level, energy or code requirements and the desired completion date. Specify products by brand or acceptable equivalent, model, grade, color, size and quantity where those choices affect price. If you change the scope or materials while bids are pending, issue the same revision to every contractor.
Ask contractors to identify assumptions and allowances. An allowance is a budget placeholder rather than a guaranteed final product cost; the bill can rise if your selection costs more. Require a written explanation of how allowance adjustments will be calculated.
2. Put proposals side by side
Use the same headings for every bid. Mark each line as included, excluded, not applicable or unknown, and write the contractor’s explanation in a notes column.
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|---|---|
| Scope and exclusions | Does the bid cover every task, including demolition, protection of existing areas, removal and disposal? What work is expressly excluded? |
| Materials | Are brand, model, grade, dimensions, quantities, delivery and installation specified? Is an “equivalent” substitution allowed, and who approves it? |
| Price | Is the amount a total for the stated scope? Does it include applicable sales or other taxes, permits, inspections, delivery, installation and disposal? |
| Schedule | What start and completion dates are assumed? Are weather, material lead times, owner decisions or inspection delays addressed? |
| Payment | What deposit and milestone payments are required? When is the final payment due, and are retainage or holdbacks addressed? |
| Financing | If the contractor arranges financing, what interest, points, origination fees or other loan charges will you pay? |
| Workforce | Will the contractor use employees or subcontractors? Which party is responsible for coordinating and paying them? |
| Warranty | What workmanship and manufacturer warranties apply, for how long, and how are claims submitted? |
| Cleanup | Does the price include daily housekeeping, final cleanup, debris hauling and disposal fees? |
| Changes | How are extra work, credits and substitutions priced, approved and documented before work proceeds? |
3. Investigate large differences
Ask every contractor whose total is materially higher or lower to walk through labor hours, quantities, product specifications, permits, disposal and exclusions. The FTC advises consumers to seek an explanation for large price differences. A low bid may omit an entire phase; a high bid may include better materials, more site preparation, a longer warranty or a realistic allowance. Do not “average” the numbers until you know what each one buys.
What fees should be included in a contractor estimate?
Request a full-price statement that identifies each charge and its treatment. The Kentucky Attorney General specifically lists down payments, finance charges, building permit fees, installation and materials as items an estimate should cover. Washington’s Department of Labor & Industries tells consumers to verify permit fees, taxes and other costs and recommends a contract stating the price, including sales tax and permit fees where applicable.
Labor and the complete work scope
Confirm whether labor includes setup, protection, demolition, removal of old work, preparation, installation, testing, commissioning and punch-list corrections. “Install” can mean very different things: a flooring price may omit subfloor repairs; a window price may omit flashing or interior trim; a bathroom price may omit waterproofing or disposal. Have the contractor list labor that is excluded or dependent on concealed conditions.
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Materials, delivery and installation
Check product specifications and quantities, freight, delivery to the site, unloading, storage, fasteners, underlayment, trim, sealants and finishing materials. Ask whether sales tax is calculated on materials, labor or both under the applicable local rules. If the proposal uses an allowance, record the allowance amount and the markup or credit applied when you make the final selection.
Taxes
Do not assume a tax-free line means no tax is due. Ask which taxes the contractor expects to collect, the rate used, the taxable base and whether the rate is an estimate that will be reconciled at invoicing. Tax treatment varies by state, municipality, project type and whether materials are sold separately or incorporated into an improvement. Confirm uncertain treatment with the relevant revenue authority or a qualified tax professional in your jurisdiction. Have the contract state whether the quoted total includes applicable sales or other taxes and how a later rate change would be handled.
Permits and inspections
Ask which permits, plan reviews and inspections the project requires; who applies, pays and schedules them; and whether the estimate includes agency fees, plan-review charges and reinspection costs. Put the responsible party and expected fees in writing. A contractor saying “permits by owner” can leave you responsible for applications, delays and compliance even if a fee appears nowhere in the headline total.
Local rules differ. In New York City, the Department of Consumer and Worker Protection requires a written permit disclosure before the contract. The disclosure identifies the permit type, the party responsible for obtaining it, required steps, estimated fees and a way to verify permit status. That requirement is NYC-specific and should not be presented as a nationwide rule. Elsewhere, confirm requirements with your building department.
Financing and payment costs
Separate the construction price from the cost of borrowing. Request the annual percentage rate, interest, points, origination or dealer fees, late charges and any cancellation or prepayment terms for contractor-arranged financing. Compare the total amount you will repay, not just the monthly installment. A cash bid and a financed bid are not equivalent until these costs are shown.
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Clarify who supplies dumpsters, hauling, hazardous-material handling, daily cleanup and final site cleaning. Ask whether subcontractor costs are included and whether the prime contractor adds a management markup. The contract should identify who coordinates subcontractors and remains responsible for their work and payment.
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Warranties and post-completion work
Record workmanship coverage, manufacturer warranties, start dates, exclusions, maintenance requirements and the process for reporting defects. A manufacturer warranty may cover a product but not labor to remove and reinstall it. A contractor workmanship warranty may exclude products or damage caused by other trades, so read both documents.
How to use a fee-and-scope checklist
Send this checklist to each bidder and require a response beside every item. “Unknown” is a prompt for clarification, not an acceptable final answer.
| Item | Included, excluded, not applicable or unknown? | Detail to obtain |
|---|---|---|
| Labor and described scope | Ask for a line-item answer | Tasks, hours or unit prices; removal and disposal where relevant |
| Materials and products | Identify each product | Specifications, quantities, delivery, storage and installation |
| Sales or other taxes | State the tax basis | Rate, taxable items and reconciliation method |
| Permits and inspections | Name the responsible party | Permit types, application fees, inspections and reinspection charges |
| Down payment | State amount and due date | Whether it is credited to the contract price and how it is protected |
| Payment milestones | Tie payments to work | Amounts, completion points and final-payment conditions |
| Financing charges | Show separately from construction price | APR, points, origination, late and prepayment costs |
| Cleanup and debris | Define the standard | Daily housekeeping, dumpster, hauling and final cleanup |
| Subcontractors | Explain responsibility | Trades involved, coordination and payment responsibility |
| Warranties | Attach terms | Duration, coverage, exclusions and claim procedure |
| Allowances and assumptions | List every allowance | Amount, selection deadline, markup, credit and adjustment formula |
| Exclusions and contingencies | Describe possible additions | Concealed conditions, owner-supplied items and triggering evidence |
| Change orders | Require written approval | Scope, price, schedule effect and signatures before extra work |
What belongs in the written contract?
Convert the chosen estimate into a contract rather than relying on a sales conversation. Include the exact scope, drawings or specifications, product selections, total price, tax treatment, permit responsibility, start and completion assumptions, payment schedule, subcontractor arrangements, cleanup standard, warranties, insurance information and the change-order procedure. Keep the signed estimate and every attachment with the contract.
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Define changes before they happen
A change order should describe the added, deleted or substituted work; the price increase or credit; any schedule adjustment; and the signatures or other approval required. Do not authorize extra work through an informal text message if the contract requires a signed document. Keep copies of approvals, invoices, receipts and inspection records.
California has a specific rule: the Contractors State License Board says covered home-improvement changes must be in a written change order signed by both parties before the change is performed. This is California-specific; other jurisdictions may use different requirements.
State payment and deposit terms precisely
List each payment trigger, the amount or percentage, and the work that must be complete before payment. Avoid a schedule that pays substantially ahead of progress without a clear reason and protection for unfinished work. California CSLB’s page describes a California down-payment cap of $1,000 or 10% of the contract price, whichever is less, subject to the conditions and scope of California law. Do not apply that figure to another state or project without checking the current local rule.
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Jurisdiction-specific protections and limits
Consumer laws governing estimates, deposits, cancellation rights, overages, permits and required contracts vary by jurisdiction and can change. Treat the following examples as local rules, not a national template.
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The Government of Ontario states that when an estimate is included in a renovation contract, the final price for goods and services cannot exceed the estimate by more than 10% unless the consumer agreed to new work or a new price and signed a contract change. The 10% threshold is Ontario-specific and applies in the circumstances described by Ontario’s guidance; it is not a general allowance for contractors everywhere.
New York City permit disclosure
NYC’s disclosure requirement applies before the contract and covers permit type, responsibility, steps, estimated fees and permit-status verification. A project outside NYC may have a different disclosure or no comparable form, so consult the local authority.
Other locations
State, provincial, county and municipal agencies may impose their own contract language, cancellation periods, licensing checks, deposit limits or estimate rules. Ask the authority having jurisdiction which permits and consumer forms apply to your address and project. If a dispute is developing, use the contract’s notice procedure and consider advice from a licensed local professional rather than assuming another state’s rule controls.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical sequence from first bid to signed agreement
- Write the scope. Describe the work, dimensions, quantities, finishes, site conditions, owner-supplied items and target dates.
- Request comparable written estimates. Give every contractor the same scope and material specifications. Request line items for labor, materials, taxes, permits, inspections, installation, disposal and financing.
- Normalize the totals. Build a side-by-side table and mark included, excluded, not applicable and unknown. Add allowances and conditional costs as separate lines rather than silently treating them as included.
- Question differences. Ask for explanations of unusually low or high labor, quantities, product quality, permit assumptions, schedule, warranty and exclusions. Get revised answers in writing.
- Verify qualifications and logistics. Check the contractor’s required license or registration, insurance evidence, references and subcontractor plan with the appropriate local authority. Confirm who will obtain permits and schedule inspections.
- Confirm taxes and fees. Ask how taxes were calculated and whether rates could change. Verify permit and inspection requirements with the building department or other authority when the contractor’s answer is uncertain.
- Negotiate only documented changes. If you alter materials, scope or dates, issue the same revision to bidders or obtain a written change order from the selected contractor.
- Sign a complete contract. Attach the final estimate, specifications, allowances, schedule, payment plan, warranties and change-order form. Do not start on a verbal promise that the paperwork will follow.
- Keep a project file. Save estimates, signed contracts, permits, inspection results, receipts, payment confirmations, photographs and every approved change.
Warning signs in an estimate
- A single rounded total with no scope, quantities or material specifications.
- A price dramatically below comparable bids with no explanation of omissions.
- “By owner,” “allowance,” “as needed” or “standard” used without amounts, limits or definitions.
- No statement about taxes, permits, inspections, delivery, installation, disposal or subcontractors.
- A large deposit or accelerated payment schedule unrelated to completed work.
- Pressure to sign immediately, pay in cash, use a lender without seeing loan terms or approve extras verbally.
- A promise that permits are unnecessary without confirmation from the local building authority.
- Refusal to put the scope, price, warranty or change process in writing.
One warning sign does not prove misconduct, but it identifies a question that must be answered before you commit money. A contractor who cannot explain the estimate clearly is not offering a comparable bid.
When the final bill is higher
Compare the invoice with the signed scope and approved changes line by line. Separate legitimate owner-requested additions from concealed conditions, contractor errors, tax adjustments and unapproved work. Request copies of receipts or permit invoices when a pass-through cost is disputed. Check whether an allowance was exceeded under the agreed formula and whether the contractor gave the notice required by the contract.
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If the contractor performed extra work without the written approval required by your agreement or local law, state that fact in writing and preserve the evidence. Use any notice, mediation or licensing-board process available in your jurisdiction. Do not withhold an amount that local law or the contract requires you to pay without obtaining local legal advice.
Questions to ask before signing
- What exact work and products are included, and what is excluded?
- Does the total include applicable taxes, permits, inspections, delivery, installation, cleanup and disposal?
- Who applies for each permit, pays each fee and schedules each inspection?
- Which costs are allowances or contingencies, and how are they adjusted?
- What deposit and milestone payments are due, and what work triggers each one?
- What financing charges apply if I use your lender or payment plan?
- Which employees and subcontractors will perform the work?
- What are the workmanship and product warranties?
- How will a change be priced, scheduled and approved before work starts?
- What happens if concealed conditions, material delays or an inspection failure affect cost or timing?
Bottom line: compare complete obligations, not headline totals
The safest bid is the one you can explain line by line. Match scope and specifications, expose taxes and fees, assign permit responsibility, compare schedule and warranty terms, and require written approval for every change. Local rules may add protections—such as Ontario’s specific estimate-overage rule, California’s written-change-order and deposit provisions, or NYC’s permit disclosure—but none should be generalized beyond its jurisdiction. Sign only after the complete price and the process for changing it are written and understood.
Frequently Asked Questions
Should I always get three contractor estimates?
Obtaining three written estimates is practical guidance from several consumer agencies, not a universal legal requirement. More important than the exact number is giving every bidder the same detailed scope and comparing equivalent work and materials.
Does a contractor estimate automatically include sales tax and permit fees?
No. Ask the contractor to state whether each tax, permit and inspection fee is included, excluded or estimated, and verify uncertain treatment with the appropriate local authority.
What is an allowance in a construction estimate?
An allowance is a budget placeholder for an item not finally selected. Record its amount, the selection deadline, any markup and the formula for a credit or additional charge.
Can a contractor charge for extra work without a signed change order?
The answer depends on the contract and local law. Require written scope, price and schedule approval before extra work; California has a specific signed-change-order requirement for covered home-improvement changes.
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