CALIFORNIA CONTRACTOR RESOURCE CENTER
California home improvement contract requirements
Practical, source-linked guidance for licensed California home improvement contractors who need to understand the contract information, payment structure, notices and change-order workflow that California requires.
Last reviewed: September 26, 2026
Start with the core rule
California Business and Professions Code §7159 applies to qualifying home improvement agreements where the aggregate contract price exceeds $500, including labor, services and materials. It sets out what the written contract must contain, how payments are structured, which notices are included and how changes are documented.
Contractors should also confirm whether other specialized rules apply to a particular job before relying on this overview.
The contract workflow at a glance
Put the agreement in writing
California requires a written contract for home improvement projects over $500. The contract and any changes to it must be in writing.
Define scope, materials, price and dates
The contract describes the project, significant materials and equipment, the contract price, and approximate start and completion dates.
Structure down payment and progress payments
As a general rule, a down payment may not exceed $1,000 or 10% of the contract price, whichever is less, and statutory exceptions can apply. When progress payments are used, a detailed payment schedule is required.
Document changes before changed work begins
Change orders must be written and signed before the changed work is performed.
California contractor guides
California Home Improvement Contract Requirements
An overview of B&P §7159: required contract information, down payments and the progress payment schedule, required notices and written change orders.
California Contractor Down Payment Limit
How the general $1,000-or-10% rule is calculated, what special-order materials do not change, and where the statutory exception appears.
California Contractor Progress Payment Rules
How payment schedules tie dollar amounts to project phases, work performed and materials delivered.
California Contractor Change Order Requirements
How to document scope changes, price adjustments and effects on progress payments or completion dates.
California Mechanics Lien Warning
Why the warning appears in home improvement contracts and where to find CSLB mechanics-lien guidance.
California Contract Cancellation Rights
Why California uses different three-day, five-day and seven-day cancellation frameworks — and why Service and Repair contracts need separate analysis.
How ContractBuilderAI fits
ContractBuilderAI is a guided workflow that helps contractors collect project details, draft scope and materials, organize payment schedules, work through review checkpoints, use e-signature and retain an audit trail.
The contractor remains responsible for reviewing the contract and confirming the requirements that apply to the project.
Official sources
- Contractors State License Board — What Is a Home Improvement Contract?
- California Legislature — Business and Professions Code §7159
- Contractors State License Board — Contracts and Binding Agreements
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 →