A contractor contract must include a detailed scope of work, materials list with brands and grades, start and completion dates, total price, a milestone-based payment schedule, a signed change order clause, proof of current insurance and license, warranty terms for materials and workmanship, a lien waiver requirement, and a dispute resolution process. Missing any of these creates gaps that disputes fill.
Key Takeaways
- A complete contractor contract has 12 core sections. Each protects a different part of your investment.
- The scope of work must be specific enough that a third party could read it and know exactly what is and is not included.
- The payment schedule must tie every payment to a verifiable milestone, not to a date or a contractor’s request.
- The change order clause must require written sign-off before any modification to scope, price, or timeline takes effect.
- Proof of current general liability and workers’ compensation insurance must be provided at signing, not promised later.
- The AIA A105 is the most widely used standard contractor agreement form for small residential projects.
Table of Contents
- The 12 Required Contract Sections
- How to Write a Strong Scope of Work
- Payment Schedule Requirements
- Change Order and Materials Clauses
- Insurance and License Documentation
- Warranty and Dispute Resolution
- Contract Checklist Before Signing
- Frequently Asked Questions
- Final Word
The 12 Required Contract Sections
This contractor contract checklist, covering all construction contract requirements, has 12 core sections. Each one addresses a specific risk. Skipping any creates a gap that can cost you money or legal standing later.
| # | Section | What It Protects |
| 1 | Scope of work | Defines exactly what is being done |
| 2 | Materials list | Prevents cheaper substitutions |
| 3 | Start and completion dates | Holds contractor to a timeline |
| 4 | Total contract price | Fixes the agreed number |
| 5 | Payment schedule | Ties payments to completed work |
| 6 | Change order clause | Requires written approval for all changes |
| 7 | Insurance requirements | Protects you if workers are hurt |
| 8 | License information | Confirms contractor is legal to work |
| 9 | Warranty terms | Gives you recourse for defective work |
| 10 | Lien waiver requirement | Protects your property title |
| 11 | Dispute resolution | Sets the process if things go wrong |
| 12 | Right of rescission notice | Required by law in most states |
The AIA A105 standard form, published by the American Institute of Architects, covers all 12 and is the most widely recognized contractor agreement document in the US residential market. For a home improvement project over $10,000, using the AIA A105 or a similarly complete form is the simplest way to ensure nothing is missed. Our pillar guide to contractor contracts covers each section in depth.
How to Write a Strong Scope of Work
The scope of work section is the most important in any contract. It defines what is being built, removed, or changed, and what is not. A vague scope is where most renovation disputes begin.
A strong scope of work answers these questions for every element of the project:
- What material or product is being used (brand, grade, model, finish)?
- What quantity or dimension applies?
- Who supplies it, contractor or homeowner?
- What is done with the old material (removed, disposed, retained)?
- What exactly is the installation method or standard?
A bad scope reads: “Install new kitchen cabinets.” A good scope reads: “Remove and dispose of existing upper and lower cabinets. Supply and install 28 linear feet of KraftMaid Cabinetry in the Maple/Dove White finish, including all trim, fillers, and hardware, per the attached drawing. Install to manufacturer specifications, level and plumb, with full overlay doors.”
The second version removes room for substitution, disagreement, or misunderstanding. Every major item should have this level of specificity: cabinets, countertops, flooring, tile, plumbing fixtures, appliances, paint colors, hardware. The contractor agreement requirements in most states do not mandate this level of detail, but without it, you are unprotected.
Where an item has not been chosen yet, use an allowance with a specific dollar amount and a note that the final selection will be documented in a change order. Our full guide to what is a contractor allowance explains how allowances work within the contract.
Payment Schedule Requirements
The payment schedule clause is where homeowners lose money most often when a renovation goes wrong. A schedule that pays too much too early leaves you with no leverage and no recourse if the contractor stops working.
A compliant payment schedule, which avoids front-loaded payments and preserves your leverage, has these characteristics:
| Requirement | Why It Matters |
| Tied to milestones, not dates | Prevents payment for work not done; avoids a lump sum paid upfront |
| Final payment 10% to 15% | Keeps contractor accountable to completion |
| No payment before any work begins exceeds 25% to 33% | Limits exposure if contractor disappears |
| Each payment described specifically | No ambiguity about what triggers it |
| Payment method specified | No cash; traceable payment only |
What triggers each payment should be objectively verifiable. “Rough-in electrical and plumbing inspected and approved by the building department” is a verifiable milestone. “Upon contractor request” is not a milestone at all. Each release of funds should correspond to work you can see, touch, and confirm is complete.
The contractor contract requirements in California and many other states explicitly cap initial deposits. In California, the maximum deposit is the lesser of 10% of the contract price or $1,000. Even in states without a cap, exceeding 25% to 33% as an initial payment is a financial warning sign. Our full guide to the contractor payment schedule covers the structure for different project types.
Change Order and Materials Clauses
Two clauses often omitted or poorly written are the change order process and the materials substitution policy. Both have significant financial implications.
The change order clause must state that no change to scope, price, or timeline is valid without a signed written change order from both parties. It should specify the markup rate for change order work and any administrative fee. Without this clause, a contractor can perform additional work and bill for it at the end, or substitute cheaper materials without written notice, and you have limited recourse.
The materials substitution clause addresses what happens if the specified material is unavailable. It should require written notice from the contractor before any substitution is made, specify that the homeowner must approve any substitution, and state whether the price adjusts up or down for the substitute. Without it, a contractor can quietly swap a specified brand for a cheaper alternative and stay within the letter of the contract while violating its spirit.
Together, these two clauses close the two most common gaps in contractor agreement requirements. Our full guide to change orders explained shows how these provisions work in practice.
Insurance and License Documentation
Two documents should be in your hand, not promised, before you sign. First, a current certificate of general liability insurance naming you as an additional insured for the duration of the project. This covers property damage the contractor causes. Second, a current certificate of workers’ compensation insurance covering all workers on the site. This covers injuries to workers who would otherwise have a claim against you as the property owner.
Verify these certificates yourself. Do not accept a photocopy that may be outdated. Call the insurance carrier or use their online verification system to confirm the policy is active and the limits are adequate. A minimum of $500,000 to $1,000,000 in general liability is typical for residential work. Workers’ comp coverage should match your state’s statutory requirements.
The contract must also include the contractor’s license number and issuing state. You can verify the license is active, in good standing, and covers the type of work at your state’s Contractors State License Board website or equivalent licensing portal. Our guide on how to verify contractor license and insurance walks through this process step by step.
Warranty and Dispute Resolution
The warranty section should cover both materials and workmanship, specify the duration (one to two years is standard for residential work), and state the remedy: repair, replacement, or refund. Warranty language that covers only “defects in materials supplied by contractor” provides no protection if the contractor’s installation caused the problem. Get a warranty that covers the installation itself.
The dispute resolution clause sets the process if something goes wrong. Most construction contracts specify mediation as a first step. If mediation fails, most proceed to binding arbitration rather than litigation. Arbitration is faster and cheaper than going to court, though it limits your ability to appeal. If the contract specifies arbitration, confirm the rules that apply (AAA, JAMS, or another body) and the location.
Finally, confirm the contract includes the right of rescission notice required by the Federal Trade Commission Cooling-Off Rule (FTC) for contracts signed at your home. This is the homeowner’s legal right to cancel within three business days without penalty. A contractor who omits this notice is violating federal law. The omission may make the contract voidable and creates a useful paper trail if you need to cancel.
Contract Checklist Before Signing
Use this checklist before signing any home improvement contract:
| Item | Check |
| Scope covers every item with brand, grade, and quantity | |
| All major material choices or allowances are listed | |
| Start date and completion date are written in | |
| Total price matches the estimate | |
| Payment schedule ties every payment to a milestone | |
| Final payment is 10% to 15% and held until punch list done | |
| Change order clause requires written sign-off before any change | |
| Materials substitution clause requires written notice and approval | |
| General liability certificate (you named as additional insured) | |
| Workers’ comp certificate in hand and verified | |
| Contractor license number listed and verified | |
| Warranty covers both materials and workmanship with a stated remedy | |
| Lien waiver requirement states when and how waivers will be provided | |
| Dispute resolution clause specifies mediation then arbitration | |
| Right-of-rescission notice included if contract signed at your home |
Any unchecked box is a conversation to have with the contractor before you sign. Every item on this list either protects your money, your property, or your legal rights. None of them is optional.
Frequently Asked Questions
What should be in a contractor contract?
A contractor contract must include a detailed scope of work with specific materials, start and completion dates, total price, a milestone-based payment schedule, a change order clause requiring written approval, current insurance and license certificates, warranty terms covering both materials and workmanship, a lien waiver requirement, and a dispute resolution process.
Is there a standard contractor contract form?
Yes. The AIA A105 is the most widely used standard contractor agreement for small residential projects. It covers all required sections and is recognized by courts across the US. AIA contract forms are available through the AIA website and are used by contractors, builders, and attorneys as a reliable baseline document.
What is the most important part of a contractor contract?
The scope of work is the most important section because it defines what is being built and what is not. Every dispute about what was agreed traces back to a vague or incomplete scope. Specific materials, brands, quantities, and installation standards in the scope prevent most disputes before they start.
Can I use a contractor’s own contract form?
Yes, but review it carefully. Contractor-provided contracts are often written to protect the contractor, not you. Use the checklist in this guide to verify that all 12 required sections are present and adequately written. Have a construction attorney review any contract over $25,000 before signing.
What should I do if a contractor refuses to sign a written contract?
Do not hire them. A contractor who resists putting the agreement in writing is either poorly organized or trying to preserve flexibility that works in their favor and against yours. Verbal agreements are not enforceable in construction disputes. No legitimate contractor should refuse a written contract. Refusal is a breach of contract waiting to happen.
How specific does the scope of work need to be?
Specific enough that a third party reading the contract could tell exactly what is and is not included without asking anyone. Every major material should list brand, grade, model or product line, and quantity. Every task should state what is done, how, and what happens to existing materials. If you could argue about what a clause means, it is not specific enough.
Final Word
Knowing what should be in a contractor contract protects your money, your home, and your legal rights before a single tool touches the property. The 12 required sections, from scope and materials to lien waivers and dispute resolution, each address a specific risk that vague or missing language leaves open. Use the checklist in this guide before signing anything.
Never begin work without a signed contract. Never pay the final installment until the punch list is complete. Never accept expired insurance certificates or promises to provide them later. The time to negotiate every clause is before you sign, because after work begins, your leverage drops significantly. For the full framework, see our pillar guide to contractor contracts, our guides to change orders explained and the contractor payment schedule, and our guide on how much does a general contractor cost to understand the full fee structure.
