How to Sue a Contractor in California: Deadlines, Courts, and Evidence

To sue a contractor in California, you confirm you have a legal claim, meet the filing deadline for that type of claim, check the contractor’s license, complete any required pre-lawsuit notice, then file in the court that fits your damages and formally serve the contractor. Each step has its own rules, and skipping one can delay the case or end it before it starts.

Do You Have a Legal Claim

Every lawsuit needs a legal basis. The most common claim against a contractor is breach of contract. If the contractor used cheaper materials than the contract specified, missed a completion deadline, or didn’t finish the job, that’s a breach. A written agreement makes proving the terms far easier, but the claim can survive without one.

Defective workmanship is a separate ground. Work that fails to meet California building codes or falls below reasonable professional standards can support a claim even when the contractor technically followed the contract’s wording. Plumbing that leaks within months, a deck that begins to sag, tile that lifts—the defect itself is often the evidence.

Project abandonment covers a contractor who walks off the job without legitimate cause. Fraud is different: it applies when the contractor deliberately lied, such as claiming a valid license they didn’t hold, misrepresenting qualifications, or knowingly billing for premium materials while installing inferior ones.

How Long You Have to File

California enforces strict filing deadlines. Miss yours and the court will dismiss the case no matter how strong the evidence.

Written contract: four years from the date of the breach.¹
Oral contract: two years from the date of the breach.¹
Fraud: three years, with the clock starting when you actually discover the fraud.²
Latent construction defects: the ordinary breach deadline applies, but no lawsuit for a hidden design or construction defect may be brought more than 10 years after substantial completion.³

That 10-year outer limit starts running on whichever comes first: final inspection by the local building department, recording of a notice of completion, first use or occupancy, or one year after work stopped.³ It matters most for problems that don’t surface immediately, such as a slowly failing foundation or concealed water intrusion.

Check the Contractor’s License Before Anything Else

Look up the contractor on the Contractors State License Board (CSLB) website before you do anything else. What you find can change your strategy entirely.

If the contractor was unlicensed at any point during the work, California law lets you recover every dollar you paid. Under Business and Professions Code Section 7031, a person who hired an unlicensed contractor can sue to get back all compensation paid, regardless of whether the work was any good.⁴ This is a full disgorgement rule, not a repair-cost measure. Pay $40,000 for a kitchen remodel from a contractor whose license had lapsed, and the entire $40,000 is on the table.

The same statute also blocks an unlicensed contractor from suing you to collect payment.⁴ If one threatens to come after an unpaid balance, that claim is dead on arrival. A narrow exception exists for a contractor who was previously licensed and can show a good-faith effort to remain licensed, but courts apply it rarely.

Extra Step for New Residential Construction

If your dispute involves defects in a newly built home rather than a remodel of an existing house, California’s Right to Repair Act adds mandatory steps before you can file. Under Civil Code Section 910, you must send the builder written notice by certified mail, overnight delivery, or personal delivery, describing the claimed defects in enough detail for the builder to understand the nature and location of the problems.⁵ The builder then has the right to inspect and attempt a repair before the dispute moves to court.

Using the builder’s warranty or customer service process does not satisfy Section 910. The formal written notice is required even if you have already filed warranty claims.⁵ If the builder ignores the notice or fails to follow the statutory procedures, you can proceed with the lawsuit.⁶

Build the Evidence Before You File

Contractors who did bad work almost always dispute the quality, the timeline, and the cost of repairs. Your documentation needs to answer all three.

Paperwork: the original contract, every change order, all invoices and receipts, proof of every payment, and every email, text, and voicemail exchanged with the contractor.
Photos and video: clear images of defective or incomplete work from multiple angles, with both wide shots for context and close-ups. Do this before another contractor touches the project.
Repair estimates: written estimates from at least two other licensed contractors to fix the defective work or finish the job. These translate the problem into the dollar figure the court needs to calculate your award.
Demand letter: a written notice identifying the contract terms the contractor violated, describing the defects, and stating exactly what you want. Courts want to see that you tried to resolve the matter first, and the letter sometimes produces a settlement on its own.

Which Court to File In

The amount of money you’re seeking determines the court, and getting this wrong wastes time and filing fees.

Small claims (up to $12,500): informal, quick hearings, no lawyers permitted at the hearing itself. Filing fees run $30 to $75 depending on the claim amount.⁷
Limited civil (up to $35,000): filed in Superior Court, more formal procedures, but with restrictions on discovery. You can represent yourself, though an attorney helps.
Unlimited civil (over $35,000): full discovery, potential expert witnesses, a $435 filing fee, and procedural rules complex enough that most people need an attorney.⁷

If your damages are only slightly above $12,500, you can voluntarily cap your claim at the small claims limit. You give up the difference, but you skip attorney costs and a much longer Superior Court timeline. For damages in the $13,000 to $15,000 range, the math often favors small claims.

Filing the Forms and Serving the Contractor

For small claims, use the Plaintiff’s Claim and Order to Go to Small Claims Court (Form SC-100), available on the California Courts website or at any courthouse.⁸ For Superior Court, you’ll need a Summons (Form SUM-100) and a Complaint.⁹ The Summons is a standard form; the Complaint is a document you (or your attorney) draft, explaining whom you’re suing, what they did wrong, and what you want.¹⁰ File at the appropriate county courthouse, pay the fee, and the clerk assigns a case number.

You cannot serve the papers yourself. Common methods:

Personal delivery: a process server or any adult who isn’t a party to the case hands the documents to the contractor. Simplest and most reliable.
Substituted service: if the server can’t reach the contractor after reasonable attempts, they leave the papers with a responsible adult at the contractor’s home or business and mail a second copy. Service is complete 10 days after the mailing.
Service by mail with acknowledgment: works only if the contractor signs and returns the acknowledgment form. If they ignore it, you fall back on personal or substituted service.

If the contractor operates as an LLC or corporation, you typically serve the registered agent for service of process, listed on the California Secretary of State’s business search. The county sheriff also serves civil papers for a fee, generally around $40 to $50.

Faster Recovery Paths Outside Court

Claim Against the License Bond

Every licensed California contractor must post a $25,000 surety bond with the CSLB, and that bond exists to protect consumers harmed by license law violations or defective construction.¹¹ A bond claim is separate from a lawsuit. Look up the contractor’s license on the CSLB site to find the surety company, contact the surety directly, and submit your contract, payment records, and documentation of the defective work. If the surety agrees you were harmed, it pays out up to the bond amount.¹²

The $25,000 cap is the main limitation. Damages beyond that require the courts. If the contractor posted a cashier’s check instead of a bond, which is allowed, you’ll need a court order before the CSLB can release those funds.¹²

Complaint With the CSLB

You can also file a complaint with the CSLB asking the board to investigate. Go in with realistic expectations. The CSLB is a regulatory agency, and its own website says financial restitution is not guaranteed and that consumers whose main goal is getting their money back should consider the courts.¹³¹⁴¹⁵ Even if you plan to sue, the complaint creates an official record that can support your court case.

If the Contractor Files for Bankruptcy

A contractor who files for bankruptcy while your case is pending, or before you file it, triggers what federal law calls the automatic stay. Under 11 U.S.C. Section 362, the bankruptcy filing immediately halts almost all lawsuits and collection actions against the contractor.¹⁶ Your case isn’t dismissed; it freezes.

You can ask the bankruptcy court to lift the stay and let your suit proceed, particularly if the litigation would produce meaningful recovery or is directly relevant to the bankruptcy.¹⁶ Even if the stay stays in place, you can file a proof of claim and stand in line with other creditors. The contractor’s surety bond and any insurance coverage sit outside the contractor’s own assets, so those recovery paths remain open through a bankruptcy.

Taxes on What You Recover

A settlement for the loss in value of your property is generally not taxable as long as the payment doesn’t exceed your adjusted basis in the property, roughly what you paid for it plus improvements. You reduce your basis by the settlement amount, which affects your taxes when you eventually sell. Any part of the settlement that exceeds your adjusted basis is taxable income.¹⁷ For larger settlements with multiple components, such as repair costs, lost rental income, and emotional distress, ask a tax professional how each piece is treated.

1
California Courts. Deadlines to Sue Someone
2
California Legislative Information. California Code CCP Section 338
3
California Legislative Information. California Code CCP Section 337.15
4
California Legislative Information. California Business and Professions Code Section 7031
5
California Legislative Information. California Civil Code Section 910
6
Contractors State License Board. Construction Defect Notice to Owners of New Residential, Single
7
California Courts. Statewide Civil Fee Schedule
8
Judicial Council of California. Plaintiff’s Claim and Order to Go to Small Claims Court
9
California Courts. Summons SUM-100
10
California Courts. Summons and Complaint
11
Contractors State License Board. Bond Requirements
12
Contractors State License Board. CSLB Fast Facts – A Guide to Contractor License Bonds
13
Contractors State License Board. Filing a Construction Complaint
14
Contractors State License Board. How the Complaint Process Works
15
Contractors State License Board. Mandatory Arbitration Program Guide
16
Office of the Law Revision Counsel. 11 USC 362
17
Internal Revenue Service. Publication 4345 – Settlements Taxability