CALIFORNIA CONTRACT DATES
California Home Improvement Contract Start and Completion Date Requirements
California's home improvement contract rules treat project timing as more than a scheduling note. The contract addresses what counts as substantial commencement, gives an approximate start date and gives an approximate completion date — then later written changes need to keep timing effects visible.
Last reviewed: September 26, 2026
What §7159 requires for project dates
Substantial commencement
What will count as substantial commencement on this particular job. There's no one-size definition in the statute, so the contract has to describe it.
Approximate Start Date
Roughly when the crew expects to start.
Approximate Completion Date
Roughly when the work should be finished.
California's statute treats commencement and completion differently: the start-date section includes a project-specific description of substantial commencement, while the completion-date section calls for an approximate completion date.
See §7159(d)(10) and §7159(d)(11) in the current statute for the controlling text.
What substantial commencement means in the contract
Substantial commencement is not a blank label to leave for later. §7159(d)(10) calls for the contract to describe what constitutes substantial commencement of work under that agreement.
Because it's tied to the agreement, the description should reflect the real first stage of the job you're contracting for. You won't find a universal definition here, or a clause to paste into a contract.
FICTIONAL WORKFLOW EXAMPLES — NOT CONTRACT LANGUAGE
- Kitchen remodel: onsite demolition begins.
- Window replacement: the first scheduled installation crew begins removal and replacement work.
- Exterior paint project: scheduled surface-preparation work begins onsite.
These illustrations are fictional. On a real job, the right description depends on the actual project and agreement.
Why the dates are approximate
The statute's own labels are “Approximate Start Date” and “Approximate Completion Date.” Weather, inspections and material lead times rarely cooperate to the day, and the wording lets a contract state a realistic schedule without pretending otherwise.
Approximate does not mean optional. The workflow still needs an actual project date to review before signature.
Start date, completion date and the signed customer copy
The approximate dates are terms the customer reads before signing. A separate requirement, §7159(c)(3)(A), calls for the buyer to receive a signed and dated copy of the contract before covered work begins.
The contract timeline and the signing timeline are related, but they are not the same requirement.
Review both in the 15-point contract checklist and the contract requirements guide.
When the project schedule changes
Few jobs finish exactly as signed. Owners add or drop scope, materials get substituted, and other changes are documented along the way. Some of those changes stretch the schedule.
When a written change order affects project timing, the change-order record should keep that completion-date effect visible rather than leaving the original contract date and the changed project schedule disconnected.
§7159's change-order notice addresses the effect of a change on progress payments or the completion date. See §7159(e)(3)(B)(iii) in the current statute and the change order guide.
How dates connect to progress payments
PRACTICAL WORKFLOW GUIDANCE — NOT A SEPARATE STATUTORY RULE
Start dates, completion dates and progress-payment stages are separate contract fields, but they describe the same project. A practical review should check that the timeline and the payment-stage story do not contradict each other.
Project sequence
Would a superintendent recognize the stages as the order the job will really run?
Payment stages
Are payments labeled by work, services, materials or equipment, not just by calendar date?
Schedule changes
After a written change shifts timing or payment stages, do the related records still agree?
Fictional kitchen-remodel timeline
Contract signed and customer copy delivered
January 5, 2027 (fictional)
The signing record is completed before covered work begins.
Approximate Start Date
January 12, 2027 (fictional)
The fictional project schedule expects onsite work to start.
Substantial commencement
January 12, 2027 (fictional)
For this walkthrough only, onsite demolition is the described commencement event.
Mid-project stages
January–March 2027 (fictional)
Demolition, cabinets, countertops and finish work move through the fictional payment-stage sequence.
Approximate Completion Date
March 20, 2027 (fictional)
The walkthrough uses this as its approximate project completion date.
This timeline is fictional and educational. It is not a recommended schedule or contract clause for a real project.
Common date-field mistakes to catch before signature
Missing commencement description
There's a start date, but nothing that says what counts as substantial commencement.
Blank project dates
The contract gets to signature with the approximate start and completion dates still blank.
Dates copied from an old job
Last month's template still carries last month's dates.
Change order and schedule disagree
A signed change pushes the schedule, yet the contract record never shows the new completion-date effect.
Payment stages and project sequence conflict
The payment schedule describes one job; the scope and work sequence describe another.
Pre-signature project-date checklist
- Substantial commencement is described for this project.
- Approximate Start Date is populated.
- Approximate Completion Date is populated.
- The dates match the current scope and project assumptions.
- The payment-stage sequence makes sense against the project timeline.
- Any already-agreed written change affecting timing is reflected in the contract record.
- The customer-copy and signature workflow is ready before covered work begins.
- Current law and project-specific requirements have been reviewed.
Related California contract guides
B&P §7159 statute guide
See the wider statutory framework around contract content, payments, notices and changes.
Contract requirements
Review the full California home improvement contract workflow.
15-point contract checklist
Run the broader pre-signature review.
Contract template guide
See where project dates sit in the overall contract anatomy.
Annotated contract example
See the same fictional dates in the kitchen-remodel walkthrough.
Progress payments
Connect payment stages to recognizable work and materials.
Change orders
Keep scope, price, payment and completion-date effects visible in written changes.
From project dates to a guided contract workflow
In ContractBuilderAI, project dates live in the same workflow as scope, materials, price, payment stages, review checkpoints, change orders, e-signature and the contract record.
ContractBuilderAI helps organize the workflow. The contractor remains responsible for the final agreement and for confirming which requirements apply to the project.
Primary sources
- California Legislature — Business and Professions Code §7159
- CSLB — What Is a Home Improvement Contract?
- CSLB — Contracts and Binding Agreements
- CSLB — Sample Home Improvement Contract
Building California contracts should not start from a blank page.
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