Home improvement contractor contract: 8 clauses to review

Quick answer: A legitimate contractor contract should specify: exact scope of work, materials by brand and grade, start and completion dates, payment schedule tied to milestones (not upfront lump sums), lien waiver process, change order procedure, permits and who pulls them, and warranty terms. Never pay more than 10-33% upfront. A contractor who refuses to put specifics in writing is showing you their operating style.

Home improvement fraud costs U.S. homeowners over $200 million annually. Most of it is not dramatic fraud -- it is contracts with vague scope, materials substituted for cheaper alternatives, payment schedules that leave homeowners with no leverage, and "change orders" that balloon the final cost well beyond the original quote. The contract is your primary protection against all of these.

The 8 things a solid contractor contract must include

1. Specific scope of work

The scope section should describe exactly what will be done -- not in general terms ("install new roof") but in specifics ("tear off two layers of existing asphalt shingles, inspect and replace any damaged decking, install 30-lb felt underlayment and GAF Timberline HDZ 30-year architectural shingles in color [X]").

If the scope says "as discussed," "per your specifications," or similar open-ended language, the contractor can argue later that they delivered what was agreed. Vague scope is the #1 source of disputes.

2. Materials by manufacturer, model, and grade

Every material should be specified: brand name, product line, grade, and color where relevant. "Quality flooring" is not a specification. "Anderson natural hickory engineered hardwood, 5-inch plank, floating installation" is.

Contractors have enormous latitude to substitute cheaper materials when specifications are absent. A flooring quote using premium LVP ($3/sqft) versus builder-grade LVP ($0.80/sqft) represents thousands of dollars on a typical project, and without a material spec in the contract, the substitution is undetectable until the job is done.

3. Start date and completion date

Both should be in the contract with clear definitions. "Start date" means when workers arrive on site and begin work, not when permits are pulled. "Completion date" means substantial completion of all specified work, not "when we get to it." Many contracts say "estimated" start and completion -- push for firm dates or at minimum penalty/notice provisions if dates slip significantly.

4. Payment schedule tied to milestones

This is the clause that most protects you financially. Legitimate contractors do not require full payment upfront. The standard schedule for a significant project:

• 10-33% at contract signing (materials deposit)
• Scheduled payments at specific milestones (framing complete, rough-in complete, etc.)
• 10-20% held until final inspection and punch list completion

Never pay 50%+ before work begins. A contractor who needs half the contract value upfront before starting has a cash flow problem you do not want to fund. This is the most common pattern in contractor fraud.

5. Change order procedure

Every deviation from the original scope -- additional work discovered, material substitutions, design changes -- must be documented in a written change order, signed by both parties, with a clear price impact, before the work is done. A contract that does not define a change order process is a contract that permits verbal "additions" and "improvements" to be billed at the end with no prior agreement.

The standard language: "No additional work will be performed and no additional charges incurred without a written change order signed by homeowner and contractor prior to the work being performed."

6. Permit responsibility

The contract should specify who will pull each required permit and who bears the cost. In most jurisdictions, the licensed contractor is responsible for pulling permits for the work they perform. A contractor who asks you to pull permits (to avoid inspection or to work without a proper license) is a red flag. Unpermitted work can prevent you from selling your home, void your homeowners insurance on related claims, and create liability for code violations.

7. Lien waiver

Contractors who use subcontractors and suppliers can place mechanics liens on your property if those parties are not paid -- even if you paid your general contractor in full. A properly structured contract includes a process for obtaining conditional lien waivers from each subcontractor and supplier at each payment milestone, and final unconditional lien waivers from all parties at project completion.

Ask explicitly: "How will you handle lien waivers from your subs and suppliers?" A contractor who cannot explain this process may not understand it -- or may not be paying their subs.

8. Warranty terms

A contractor warranty should specify: what is covered (workmanship, materials, or both), how long coverage lasts (1-2 years for workmanship is standard; longer for specific product warranties), and what the claim process is (who to contact, what documentation is required).

The manufacturer's warranty on materials is separate from the contractor's warranty on installation. Both should be documented.

5 red flags in contractor contracts

Red flag 1: Cash only or no written contract offered. Legitimate contractors provide written contracts. Cash-only payment means no paper trail and no recourse.

Red flag 2: Lump-sum payment required before work starts. 50%+ upfront is a major warning sign. It removes your leverage completely.

Red flag 3: Vague completion timeline. "2-3 weeks, weather permitting, as schedule allows" means the contractor has no accountability for delays.

Red flag 4: No mention of permits. Any structural, electrical, plumbing, or major exterior work requires permits in most jurisdictions. A contractor who does not mention permits is planning to skip them.

Red flag 5: Pressure to sign immediately. "This price is only good today" or "I have another job lined up if you don't want it" are sales tactics designed to prevent you from reviewing the contract or getting competing bids.

For how to interpret contractor pricing and whether your quote is in range, see the homeowner's guide to reading a contractor quote. For a full pre-signing checklist that applies to any contract, see before signing any contract: a 10-item checklist and contract clauses that cost the most.

Frequently asked questions

What if the contractor says they don't use contracts?

Walk away. Any contractor handling more than a few hundred dollars of work operates under a contract -- even informal agreements create contractual obligations. A contractor who refuses to put terms in writing is refusing to be held accountable to them.

How detailed does the scope of work need to be?

Detailed enough that if a dispute arose, a third party reading the contract could determine whether the specified work was done. The test: if you substituted a different contractor mid-project, would the new contractor know exactly what to complete?

Can I write the contract myself?

Yes, or you can use a template from the American Institute of Architects (AIA), which publishes standardized owner-contractor agreement forms. Many states also have required consumer protection contract language for home improvement work. Your state's contractor licensing board website often has resources.

What happens if the contractor asks for a change order I disagree with?

Do not sign it. A change order is an offer to amend the original contract. You can negotiate the price, scope, or both. If you disagree with a change order the contractor says is necessary, get a second opinion before authorizing additional costs.

Is the homeowner responsible if a subcontractor is not paid?

Yes, via mechanics lien law in most states. Even if you paid your general contractor in full, subcontractors and suppliers can lien your property if they were not paid by the GC. This is why lien waivers matter. Your recourse is against the GC, but the lien can still cloud your title.

Run your contractor agreement through BeforeSigning to flag the clauses most homeowners miss before the work starts.