How to Sue a Contractor in California for Bad Work

Suing a contractor for defective or unfinished work is one of the remedies covered in California consumer rights: laws, complaints, and remedies. This article covers the legal claims available to a homeowner, how to check the contractor’s license, which court the case belongs in, the deadline to file, and the steps California expects before a lawsuit begins.

What you can sue a contractor for

A dispute over bad work usually rests on one or more of three claims. The most common is breach of contract: the written agreement promised a result the contractor did not deliver, whether the work was defective, incomplete, or never started. A second claim is negligence, meaning the work fell below the standard of care a competent contractor in the same trade would meet. A third is breach of warranty, either an express warranty written into the contract or an implied warranty that the work would be fit for its ordinary purpose.

For newer residential construction, the state sets specific quality benchmarks. The Right to Repair Act lists building standards a home must meet, covering water intrusion, structural soundness, plumbing, electrical systems, and other components under Cal. Civ. Code § 896. A construction defect that violates one of those standards gives the homeowner a claim without having to separately prove negligence.

The same facts can support more than one claim. Deceptive conduct by a contractor, such as charging for materials never installed, can also fall under the Consumer Legal Remedies Act, which reaches unfair and deceptive practices in transactions with consumers.

Check whether the contractor was licensed

Before filing, the contractor’s license status is worth confirming, because it changes what a court can order. California requires most construction work over $500 in combined labor and materials to be performed by a contractor licensed by the Contractors State License Board. License status can be verified through the board’s online license check.

An unlicensed contractor faces a severe rule. Under Cal. Bus. & Prof. Code § 7031, a person who was not a licensed contractor at all times during the work cannot sue to collect payment, and a customer can recover all compensation already paid for the unlicensed work, even if some of the work was done correctly. This disgorgement remedy applies regardless of the quality of the job.

Which court hears the case

California civil courts are divided by the amount in dispute, and the division determines the procedure, the fees, and whether attorneys appear.

Small claims court handles money disputes up to $12,500 for an individual, the limit set by Cal. Code Civ. Proc. § 116.221. It is the simplest and cheapest option, and parties represent themselves without lawyers. Claims above that amount go to the regular civil court. As of 2026, a limited civil case covers demands up to $35,000 under Cal. Code Civ. Proc. § 85, and an unlimited civil case covers anything larger. Both allow attorneys and follow formal discovery and motion procedures.

A claim for more than $12,500 can still be filed in small claims if the plaintiff gives up, or waives, the amount over the limit. That waiver is permanent, so the excess cannot be recovered later in any court. For a large defect claim, that trade-off is the reason many homeowners choose limited or unlimited civil instead, despite the added cost and formality. Within the chosen county, the Superior Court’s court locator identifies which courthouse handles the filing.

How long you have to file

California measures the filing deadline, called the statute of limitations, from the type of claim and the kind of defect. Missing the deadline generally ends the case regardless of its merits.

A claim for breach of a written construction contract must be filed within four years under Cal. Code Civ. Proc. § 337. A claim on an oral agreement carries a shorter two-year deadline under Cal. Code Civ. Proc. § 339. Construction-defect claims have their own outer limits: a patent defect, one that a reasonable inspection would reveal, must be pursued within four years, while a latent defect, one hidden until it causes damage, carries a limit of ten years from substantial completion under Cal. Code Civ. Proc. § 337.15.

What to do before you file

California expects several steps before a construction lawsuit, and some are mandatory for particular claims.

1. Send a written demand

   A dated letter describing the defect, the contract terms it violated, and the amount claimed creates a record and often prompts a resolution. The Contractors State License Board publishes a sample demand letter for this purpose. Keep a copy of the letter and proof that it was sent.

2. File a complaint with the licensing board

   A homeowner can file a complaint with the Contractors State License Board against a licensed or unlicensed contractor within four years of the act, according to the board’s complaint guidance. The board investigates license-law violations and can discipline the license, though it does not award money to the homeowner.

3. Give Right to Repair notice for a new home

   For claims covered by the Right to Repair Act, the homeowner must serve written notice on the builder and allow an inspection and a chance to repair before suing, under Cal. Civ. Code § 910. Skipping this prelitigation step can pause or bar the case.

4. Gather documentation

   The contract, change orders, invoices, canceled checks, photographs of the work, and any inspection or repair estimates form the core of the evidence. An estimate from a second licensed contractor to correct the work helps establish the cost of repair.

If the contractor recorded a mechanics lien on the property for the disputed balance, that lien becomes part of the dispute and may be addressed in the same litigation or through a separate release process. ## Proving the claim and collecting a judgment At the hearing or trial, the homeowner carries the burden of proving the defect and the resulting loss. The usual measure of damages is the cost to repair or complete the work correctly, which is why a written repair estimate matters. Photographs, the contract, and testimony about what was promised and what was delivered support the claim. In a construction-defect case, an expert who inspected the work often testifies about the standard the work failed to meet. Winning produces a judgment, which is a court order that the contractor owes a set amount. A judgment does not collect itself. If the contractor does not pay voluntarily, California allows enforcement tools such as a lien on the contractor’s real estate, a levy on a bank account, or an order to garnish the contractor’s wages. The Contractors State License Board can also suspend the license of a contractor who fails to pay a final construction-related judgment.