CALIFORNIA · CONTRACT CHANGES
California contractor change order requirements
A contractor-focused guide to documenting extra work, scope changes, price adjustments and schedule effects in California home improvement projects.
Last reviewed: September 26, 2026
Why change orders matter
Project conditions and customer decisions can change the scope, materials, price or timing of a job. California home improvement rules treat those changes as part of the written contract workflow rather than informal side agreements. See the California home improvement contract requirements overview for the broader contract framework.
Put the change in writing before changed work begins
CSLB guidance says that when the contract price or scope changes, the change should be documented in a written Change Order signed by the customer and the contractor before the changed work. The signed change order becomes part of the contract.
B&P §7159 includes a notice about extra work and change orders that addresses prior written authorization before extra or changed work begins. How these rules apply can depend on the facts of a particular project.
What the change order should identify
- The scope of the extra or changed work
- The amount added to or subtracted from the contract price
- The effect on progress payments, if any
- The effect on the completion date, if any
- Written authorization and signatures before the changed work begins
This list follows the extra work and change order notice in §7159(d)(13) at an overview level. Confirm the current statute text for the exact wording.
Changes to materials, schedule and payment
Material/equipment substitution
When materials or equipment are substituted, CSLB guidance says the change should be recorded in a written change order, including any change in price.
Added or removed work
When work is added or removed, the written change order describes the changed scope and the amount added to or subtracted from the contract.
Completion/payment effects
If the change moves the completion date or affects progress payments, the change order records that effect so the schedule and payments stay aligned with the contract.
What happens if the paperwork is missing?
California's statute addresses enforceability of extra/change-order work when the required written information and authorization are missing. It also preserves certain legal or equitable remedies designed to prevent unjust enrichment. The outcome depends on the facts and applicable law.
Review the current B&P §7159 and consult legal counsel as appropriate for a specific situation.
A practical contractor workflow
- Identify the requested change
- Define the changed scope and materials
- Price the addition or subtraction
- Record the progress-payment or completion-date effect
- Get written authorization and signatures
- Perform the changed work
- Retain the change order with the contract record
Operational workflow, not legal advice.
How ContractBuilderAI fits
ContractBuilderAI helps contractors keep the contract, payment schedule and related records organized in one place.
Software can organize the change-order record; the contractor remains responsible for confirming the legal requirements that apply to the change.
Primary sources
- California Legislature — Business and Professions Code §7159
- Contractors State License Board — What Is a Home Improvement Contract?
- Contractors State License Board — Contracts and Binding Agreements
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