A contractor who works without a written contract is one misunderstanding away from a costly dispute. The contract is not bureaucracy — it is the foundation that makes every other part of your business work. Here is what every home improvement contract must include to protect you and your client.
What every contractor contract must include
A legally enforceable contractor agreement needs to cover the basics clearly enough that there is no ambiguity if the relationship goes sideways. At minimum, include:
- Full names and addresses of both parties
- Detailed scope of work — what is included and what is explicitly excluded
- Start date and estimated completion date
- Total contract price and payment schedule
- Deposit amount required before work begins
- Change order process — how additions are priced and authorized
- Materials list with specifications (brand, model, finish) where applicable
- Warranty terms on workmanship
- License number and proof of insurance reference
- Dispute resolution process
How to write a scope of work that protects you
The scope of work is the most important section of the contract. Be specific. "Remodel the bathroom" is not a scope of work. "Demolish existing tile surround, install 12x24 porcelain tile per client-supplied selection, grout, and seal. Does not include subfloor repair, plumbing relocation, or fixture upgrades" — that is a scope of work.
Every item that is out of scope should be explicitly stated as excluded. When the client later asks you to paint the ceiling or replace the toilet, you point to the contract and write a change order. This protects you from the slow scope creep that quietly eats your profit.
Change orders are not optional
Any change to the original scope of work — additions, deletions, material substitutions — should be documented in a signed change order before the work is performed. Verbal agreements about additions routinely become disputes at final payment. The client remembers a different price. You remember a different conversation.
Your contract should state explicitly that no change to scope or price is effective without a signed change order. Then enforce it consistently. Clients who respect your process will not push back. Those who do are flagging a potential problem early.
Payment terms and deposit requirements
Your payment schedule should be written into the contract — not handled informally. A typical structure for larger jobs: 30 to 50 percent deposit before work starts, a progress payment at a defined milestone, and the balance at completion. Never start a job without a deposit. A client unwilling to pay a deposit before work starts is a serious warning sign.
Include a late payment clause specifying interest on overdue invoices and what happens if payment is not received. For more detail on structuring payment schedules, see our guide on contractor payment terms.
Using templates and tools to streamline contracts
Start with a solid attorney-reviewed template specific to your state and trade. Many contractor associations provide them as member benefits. Customize it for your business, then store it somewhere you can pull it up and send it quickly. Threecus lets you attach contracts directly to client records and track signature status, so you always know which jobs have signed agreements before work begins.
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