CALIFORNIA WRITTEN CONTRACT REQUIREMENT
When a California Home Improvement Contract Must Be in Writing
For a covered California home improvement project, the contract workflow starts before field work begins. Section 7159 uses an aggregate project-price threshold, requires the agreement and later changes to be written and signed, and requires the buyer to receive the signed and dated contract copy before covered work starts.
Last reviewed: September 27, 2026
The threshold starts with the aggregate project price
B&P §7159(b) applies this home improvement contract framework when the aggregate contract price specified in one or more improvement contracts, including labor, services and materials, exceeds $500.
The threshold looks at the aggregate deal the statute describes — the combined labor, services and materials specified in one or more improvement contracts — rather than a single invoice or a single payment. B&P §7159(a)(1) identifies the projects for which a home improvement contract is required, and §7159(a)(2) addresses the separate Service and Repair track discussed below.
Do not evaluate the threshold from one isolated invoice when the statute is looking at the aggregate contract price in one or more improvement contracts.
The statute says the aggregate price exceeds $500. This guide does not rewrite that threshold as 'exactly $500 or more.'
Covered home improvement contracts must be written and signed
B&P §7159(d) requires the home improvement contract and any changes to the contract to be in writing and signed by the parties before the work covered by the contract or applicable change order begins.
The definition in §7159(b) describes a home improvement contract as an agreement "whether oral or written." That language defines what counts as a covered contract. The operative formal requirement in §7159(d) then requires the covered agreement to be in writing and signed. B&P §7159(c)(1) also requires the writing to be legible.
The definition and the execution rule do different jobs. Do not read the words 'whether oral or written' in §7159(b) as permission to skip the written-and-signed requirement in §7159(d).
Give the buyer the signed and dated copy before work starts
B&P §7159(c)(3)(A) requires the contractor, before any work is started, to give the buyer a copy of the contract signed and dated by both the contractor and the buyer.
Signed
Both you and the buyer sign before covered work begins.
Dated
The customer's copy shows the signing-date information the contract calls for.
Delivered
The buyer has the completed signed and dated copy in hand before covered work begins.
Signing the agreement is not the last step. The buyer-copy delivery step happens before covered work starts.
The contract itself warns against starting work too early
B&P §7159(d)(4) requires the contract to include a statement telling the buyer they are entitled to a completely filled-in copy of the agreement, signed by both the buyer and the contractor, before any work may be started. Use the current statutory wording from the official text rather than a paraphrase.
The required notice reinforces the workflow: complete the agreement, sign it, deliver the buyer copy, then start the covered work.
Changes and extra work go back into writing
The written-contract requirement continues after signing. Section 7159(d) covers changes to the contract, and §7159(c)(5), §7159(d)(13) and §7159(e)(3) separately address written change orders, including the changed scope, the price effect and the effect on progress payments or completion.
Scope change
When the scope shifts after signing, look at the written change-order requirements before the changed work starts.
Price change
Price going up or down? Put the addition or subtraction in the written change.
Timing or payment impact
Capture the effect on progress payments or completion timing when the statutory change-order rules require it.
A signed base contract won't cover for verbal changes made later. Those still need their own written change-order record.
Read the California change orders guide → · B&P §7159 · CSLB — Contracts and Binding Agreements
Service and Repair contracts are a separate statutory track
Section 7159 does not apply to a qualifying Service and Repair contract that is subject to §7159.10 and complies with §§7159.10–7159.14.
At a high level, B&P §7159.10 describes a contract amount of $750 or less, a buyer who initiated contact with the contractor, a contractor who does not sell goods or services beyond those reasonably necessary to address the buyer's problem, and no payment due or accepted until the work is complete. If a job does not meet those conforming requirements, the ordinary §7159 home improvement contract requirements can apply.
Do not classify a job as Service and Repair from price alone. The statutory conditions work together.
Qualifying Service and Repair contracts still have their own written, signed-or-acknowledged and buyer-copy requirements.
Electronic records and signatures can satisfy writing and signature requirements
California's Uniform Electronic Transactions Act provides that an electronic record can satisfy a legal writing requirement and an electronic signature can satisfy a legal signature requirement.
UETA applies to an electronic transaction when the parties have agreed to conduct that transaction by electronic means.
That general electronic-transactions rule addresses the medium. It does not waive the content, timing, buyer-copy, cancellation or other requirements that §7159 and other applicable law impose; §7159(c)(9) also makes clear §7159 does not relieve the contractor from other applicable law.
Electronic form changes the medium, not the contractor's responsibility to complete the required contract workflow.
Fictional pre-work contract workflow
Fictional example — workflow illustration only
- Project price
- $42,000 kitchen remodel (fictional)
- Contract prepared
- September 20, 2026 (fictional)
- Buyer and contractor sign
- September 22, 2026 (fictional)
- Signed buyer copy delivered
- September 22, 2026 (fictional)
- Covered work starts
- September 29, 2026 (fictional)
These dates are fictional. A real contractor should use the actual agreement, actual signatures, actual delivery event and the requirements that apply to the project.
1. Confirm the contract path
Determine whether the ordinary §7159 home improvement contract rules or another statutory track applies.
2. Complete and sign
Fill in the contract information and get the required signatures before covered work.
3. Deliver and record
Hand the buyer the signed and dated copy, and file the contract record, before the job moves into performance.
Common written-contract mistakes to catch
Starting work after signatures but before buyer copy
Everyone signed, but the buyer still doesn't have the completed signed and dated copy.
Looking at one invoice instead of the aggregate deal
The contractor treats one invoice as the threshold measure even though §7159(b) looks at the aggregate contract price in one or more improvement contracts.
Treating an oral agreement as enough
There's a handshake deal, but the covered §7159 agreement hasn't been put into the required written and signed contract.
Change made only by text or phone
The crew changes contracted work in the field before the applicable written change-order step is done.
Service and Repair chosen from price alone
The contractor sees a job at $750 or less and ignores the other statutory Service and Repair conditions.
Electronic signature treated as a shortcut
E-signature is used, but required contract content, timing, buyer-copy or notice steps get skipped.
Blank or incomplete contract sent for signature
The document goes out for signature before the information required for this transaction is complete.
Pre-work contract execution checklist
- Confirm the project falls under the ordinary §7159 home improvement contract path or identify the different statutory path that applies.
- Calculate the aggregate contract price across the labor, services and materials covered by the deal.
- Put the covered home improvement contract into writing.
- Complete the required project, contractor, payment, date, notice and disclosure information before signature.
- Obtain the required signatures before covered work begins.
- Confirm the buyer and contractor signing dates are captured.
- Give the buyer the completed signed and dated contract copy before covered work begins.
- If the transaction is electronic, confirm the parties agreed to transact electronically and preserve the required contract record.
- Route later covered changes through the written change-order process before changed work begins.
- Review current law and project-specific requirements before starting work.
Related California contract guides
For a closer look at coverage, read When B&P §7159 applies to a home improvement contract.
B&P §7159 statute guide
The statute behind the writing, signature, copy and timing rules.
Contract requirements
The bigger picture of California home improvement contract content and workflow.
15-point contract checklist
A full pre-signature pass before the agreement goes out.
Contract template guide
How the required sections fit together before a project-specific agreement is signed.
Annotated contract example
The contract workflow applied to a fictional California remodel.
Plans & specifications
Keeping incorporated documents in step with the signed agreement and later written changes.
Change orders
Putting later scope, price, payment or timing changes in writing.
Cancellation rights
The separate cancellation framework that can apply once the contract is delivered.
How ContractBuilderAI fits
ContractBuilderAI can keep project setup, contract drafting, contractor review, e-signature, buyer-copy delivery, change orders and the contract record in one guided workflow.
ContractBuilderAI helps organize the workflow. The contractor remains responsible for choosing the correct contract path, completing the required agreement, delivering the customer copy and confirming the rules that apply before work begins.
Primary sources
- California Legislature — B&P §7159
- California Legislature — B&P §7159.10
- CSLB — What Is a Home Improvement Contract?
- CSLB — Contracts and Binding Agreements
- CSLB — 2026 California Contractors License Law & Reference Book
- CSLB — Sample Home Improvement Contract
- California Legislature — Civil Code §1633.5
- California Legislature — Civil Code §1633.7
Building California contracts should not start from a blank page.
ContractBuilderAI is opening a California private beta on November 1, 2026 for licensed home improvement contractors.
Apply for the California beta →