CALIFORNIA · B&P §7159
California home improvement contract requirements
A plain-English field guide to the California rules that shape a home improvement agreement: what belongs in the contract, how payments are staged, which notices matter, and how later changes should be documented. Primary-source links are included throughout.
Last reviewed: September 26, 2026
When a written home improvement contract is required
Once a typical California home improvement job goes above the $500 threshold, plan on a written agreement. That figure covers the whole deal, so services and materials count alongside labor. CSLB's public guidance draws the line in the same place.
Paperwork isn't identical from job to job, though. Service-and-repair work, special contract categories and statutory exceptions each bring their own rules. On a real project, begin with the current statute and CSLB guidance rather than relying on a generic template.
Read the contractor guide to B&P §7159 →
Use the 15-point California contract checklist →
See the California contract template guide →
Walk through the California contract example →
Review California start and completion date requirements →
Review California Home Improvement Salesperson requirements →
Review California contractor license information requirements →
Review California home improvement contract insurance disclosures →
Review California plans, specifications and incorporated-document requirements →
Review when a California home improvement contract must be in writing →
Core contract information
- Who is contracting: contractor name, business address and license number
- Total agreed price, shown in dollars and cents
- What the contractor is agreeing to build, repair or install
- Key materials and equipment the job depends on
- Expected start date
- Expected substantial-completion date
- Plans, specifications or other documents incorporated into the agreement
Deal terms are only part of what the statute covers. It also reaches presentation and process: type size, signatures, when the customer gets a copy, and which notices go in. Use the list above to know what to look for, and confirm the details against the current statutory text.
Down payments and progress payments
- General down-payment rule: if you take a down payment, weigh $1,000 against 10% of the contract price. Under the general rule the smaller number wins, and finance charges stay out of the math.
- Progress payment schedule: tie every installment to a defined stage of the job, and name the work, services or materials that stage covers.
- Payment ahead of work: apart from a permitted down payment and any exception that applies, payment generally shouldn't outrun completed work or delivered materials.
CSLB also describes a narrow exception for contractors with a blanket performance-and-payment bond. Few contractors operate that way, so check both your status and the current rule before counting on it. See CSLB's contracts and binding agreements guidance and the current text of §7159.
Related payment guides
Change orders
Owners change their minds. They add a pantry, drop a window, swap one tile for another. Whatever the change, get it documented before the new work starts. A useful change order shows the impact at a glance: what's different, how the price moves, and whether the payment plan or completion date shifts.
Read the California Change Order Guide →
Required notices and disclosures
Several required notices and disclosures come straight from §7159. Which ones appear depends on the job, but the list can take in insurance status, change-order information, mechanics-lien language, CSLB information and cancellation paperwork.
Cancellation timing is where old forms most often go wrong. The type of transaction, the customer's circumstances and statutory exceptions can all move the deadline, so the notice has to match the rule that actually governs the sale.
Read the California Mechanics Lien Warning Guide →
Read the California Cancellation Rights Guide →
A practical contractor workflow
- Confirm the contract category before choosing the paperwork.
- Collect contractor, owner and job-site details.
- Write the scope in project language a homeowner can follow.
- List important materials and equipment, price and project dates.
- Set the down payment and progress-payment structure.
- Add the notices and disclosures that apply to this transaction.
- Read the entire agreement before anyone signs.
- Deliver the signed customer copy at the required time.
- Use a separate written change order when the job changes.
It's a sequence for the office to follow. It isn't a legal conclusion about any particular job.
Where software helps — and where it does not
Keeping all of that straight across several jobs at once is the problem ContractBuilderAI was built around. Guided intake, draft assistance for scope and materials, payment-stage setup, review checkpoints, e-signature and an audit trail sit in one workflow.
The software helps organize the process; the contractor still decides what goes into the agreement and remains responsible for project-specific legal review.
Primary sources
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 →