California home improvement contract requirements

When a written home improvement contract is required

§7159 defines a home improvement contract to include qualifying agreements where the aggregate contract price exceeds $500, including labor, services and materials. CSLB guidance likewise describes a written contract as required when combined labor and material costs are over $500.

Specialized contract categories and statutory exceptions can have different rules, so check the current statute and CSLB guidance for the job in front of you.

Core contract information

• ✓Contractor name, business address and license number
• ✓Contract price in dollars and cents
• ✓Description of the project
• ✓Significant materials and equipment
• ✓Approximate start date
• ✓Approximate completion date
• ✓Applicable documents incorporated into the contract

§7159 also contains formatting, signature, copy-delivery and notice requirements. This page is an overview, not a substitute for the statute.

Down payments and progress payments

• General down-payment rule: if a down payment is charged, it generally may not exceed $1,000 or 10% of the contract price, whichever is less, excluding finance charges.
• Progress payment schedule: if progress payments are used, the schedule must tie dollar amounts to the work, services or materials associated with each phase.
• Payment ahead of work: as a general rule, contractors may not collect payment for work not yet completed or materials not yet delivered, apart from a permitted down payment and subject to statutory exceptions.

Exceptions exist, including the rare blanket performance and payment bond situation described by CSLB. See CSLB's contracts and binding agreements guidance and the current text of §7159 before relying on an exception.

Related payment guides

Change orders

Changes and extra work should be prepared in writing and signed before the changed work begins. The written change order addresses the change in scope, the price added or subtracted, and the effect on progress payments or the completion date.

Required notices and disclosures

§7159 includes multiple notices and disclosures, including insurance information, change-order information, a mechanics lien warning, CSLB information, and applicable cancellation notices.

Cancellation rights depend on the circumstances and can have different time periods and exceptions. Confirm the current rule that applies to the transaction.

A practical contractor workflow

1. Gather contractor, customer and project information.
2. Define the scope, significant materials and equipment, price and dates.
3. Build the payment schedule under the rules that apply.
4. Include the current required notices and disclosures.
5. Review the complete contract before signature.
6. Give the customer the required signed copy.
7. Use written, signed change orders for later changes.

This is an operational checklist, not legal advice.

Where software helps — and where it does not

ContractBuilderAI can assist with structured intake, AI-assisted scope and materials drafting, a payment-schedule workflow, review checkpoints, e-signature and an audit trail.

Software can organize the workflow; it does not replace the contractor's responsibility to review the contract or professional legal advice.

Primary sources

• CSLB — What Is a Home Improvement Contract?
• California Legislature — Business and Professions Code §7159
• CSLB — 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.