What a mechanics lien does and who can file one

A mechanics lien is a legal claim against a property that gives unpaid workers and suppliers a way to recover money when a contractor or property owner doesn't pay them. If you installed a roof, delivered materials, or performed labor on someone's building or land in California, you can file a lien that essentially freezes the property's title until you're paid. The property owner cannot sell, refinance, or transfer the property without dealing with your claim first.

In California, the people who can file a mechanics lien include general contractors, subcontractors, laborers, equipment rental companies, and material suppliers. You don't need a license to file — you just need to have provided labor or materials to improve the property. The lien applies to residential, commercial, and industrial projects, though the rules and timelines differ slightly depending on the project type.

The lien doesn't automatically pay you. It's a tool that forces negotiation or court action. Once filed, the property owner usually has strong incentive to settle because the lien clouds the title and makes the property difficult or impossible to sell or refinance.

Key Takeaways

  • A mechanics lien is a legal claim on a property that gives unpaid workers and suppliers leverage to recover money when a contractor or owner doesn't pay.
  • You must file a preliminary notice with the property owner, general contractor, and lender before you can file a lien, and the timing of this notice affects your rights.
  • In California, you generally have 90 days from your last work or material delivery to file a lien, but this important date is shorter if you did not serve a preliminary notice.
  • A filed lien must be enforced through a lawsuit within one year, or it expires and becomes unenforceable.
  • The property owner can remove a lien by posting a bond, which lets them sell or refinance while your claim moves through the court system.

The preliminary notice requirement and what it protects

Before you can file a mechanics lien in California, you must serve a preliminary notice (also called a "notice of nonpayment" or "stop notice notice") on the property owner, the general contractor, and the construction lender. This notice tells them you are working on the project and have not been paid. The notice must be in writing and must include your name, address, phone number, the property address, a description of the work or materials you provided, and the name of the person who hired you.

The timing of this notice is critical. If you serve the preliminary notice before or during your work, you have 90 days after your last day of work or material delivery to file a lien. If you do not serve a preliminary notice, or if you serve it after you finish work, your lien important date shrinks to 30 days from your last work or delivery. This is why serving the notice early — ideally within the first few days of the project — protects your rights.

You can serve the preliminary notice by hand delivery, email, certified mail, or through a process server. Keep proof of service, because you will need it when you file the lien. If you cannot locate the lender or general contractor despite reasonable effort, you can file a declaration stating that fact, and the lien will still be valid.

The steps and timeline for filing a mechanics lien

Filing a mechanics lien in California involves several steps, each with a specific important date. First, make sure you have served the preliminary notice and have proof of service. Next, prepare the lien document itself, which must include the property address, a description of the work or materials provided, the dates of work, the amount owed, the name of the person who hired you, and your name and address. California does not have a single official form, but the county recorder's office can point you to templates or you can work with an attorney.

Record the lien with the county recorder in the county where the property is located. You must do this within 90 days of your last work or delivery (or 30 days if you did not serve a preliminary notice). Recording costs vary by county but typically run $50 to $150. Once recorded, the lien becomes a public record and clouds the property's title.

After recording, you must serve a copy of the recorded lien on the property owner and the general contractor within 15 days. This is a separate step from recording and requires proof of service. If you do not serve the lien within this window, it may be invalid. Finally, you must file a lawsuit to enforce the lien within one year of recording it, or the lien expires and becomes unenforceable.

How a property owner can remove or challenge a lien

A property owner can remove a mechanics lien in several ways. The most common is to post a bond — essentially a financial may provide — with the court. The bond amount is typically 1.25 times the lien amount. Once the bond is posted, the lien is removed from the property title, and the owner can sell or refinance. Your claim then transfers to the bond, and you pursue payment through the bond instead of the property.

A property owner can also challenge the lien by filing a motion to remove it. Common grounds include claiming the lien was filed after the important date, that the preliminary notice was not properly served, that the amount claimed is incorrect, or that the work was not actually performed. If the owner wins, the lien is removed and you lose your leverage. This is why accurate record-keeping and timely filing are essential.

The owner may also straightforward pay you to remove the lien. Once paid, you must file a release of lien with the county recorder to clear the title. If you refuse to release a lien after being paid, the owner can sue you for damages.

Residential versus commercial projects and different rules

California law treats residential projects (single-family homes and multi-unit residential buildings) differently from commercial and industrial projects in some ways. For residential projects, the preliminary notice must be served before or within 20 days of your first work or delivery. For commercial and industrial projects, you have more flexibility, though serving it early is still the safest approach.

The lien important date is the same for both — 90 days from last work if you served a preliminary notice, or 30 days if you did not. However, residential projects have additional protections for homeowners. For example, if a homeowner pays a contractor in full but the contractor does not pay subcontractors or suppliers, those unpaid parties can still file a lien. This is why homeowners should require contractors to provide lien waivers from all subcontractors and suppliers before making final payment.

For all project types, the amount you can claim in a lien is limited to the contract price or the reasonable value of the work, whichever is less. You cannot inflate the amount to pressure settlement.

What happens after you file and record a lien

Once a lien is recorded, the property owner will usually contact you or their attorney to negotiate. The lien creates real pressure because it prevents sale or refinancing. Many disputes settle at this stage because the owner wants the title cleared.

If settlement does not happen, you must file a lawsuit to enforce the lien within one year of recording it. This lawsuit is called a foreclosure action, though it is different from a mortgage foreclosure. In the lawsuit, you prove that you performed the work or delivered materials, that you were not paid, and that you followed the lien procedures correctly. If you win, the court can order the property sold to pay your claim, though in practice most cases settle before trial.

The cost of enforcing a lien through litigation can be substantial — attorney fees, court costs, and informed witness fees add up. Some contractors and suppliers factor this into their decision about whether to pursue a lien. However, the existence of the lien often motivates settlement without a lawsuit.

Common mistakes that weaken or invalidate a lien

The most frequent error is missing the preliminary notice important date or serving it incorrectly. If you serve it after you finish work, your lien important date drops from 90 days to 30 days. If you serve it to the wrong person or entity, it may not count. Always serve the property owner, the general contractor, and the construction lender if one exists.

Another common mistake is filing the lien after the important date. The 90-day (or 30-day) window is strict. If you miss it by even one day, the lien is invalid and unenforceable. Keep a calendar and file early, not at the last minute.

Inaccurate information on the lien document can also cause problems. The property address must be correct, the amount claimed must be reasonable and documented, and the description of work must be clear. If the owner challenges the lien and proves a material error, the lien can be removed.

Finally, failing to serve the recorded lien on the owner and contractor within 15 days, or failing to file a lawsuit within one year, are procedural mistakes that can invalidate the lien. Each step has a important date, and each important date matters.

Frequently Asked Questions

Can I file a mechanics lien if I was paid in cash but don't have a written contract?

Yes. A written contract is not required to file a lien. You can file based on an oral agreement, email exchange, or text messages showing you were hired and performed work. However, you must still serve a preliminary notice and follow all filing important date. Documentation of the work performed and the amount owed will help if the owner challenges the lien.

What if the general contractor hired me but the property owner hired the general contractor?

You can still file a lien against the property. The lien attaches to the property itself, not to the person who hired you. You must serve the preliminary notice on the property owner, the general contractor, and the lender, even though you were hired by the contractor.

Does a mechanics lien stop an eviction or foreclosure?

No. A mechanics lien does not stop a mortgage foreclosure or an eviction. However, if a property is in foreclosure, your lien may be paid from the sale proceeds depending on the priority of liens and the sale price. Consult an attorney if your lien is on a property facing foreclosure.

Can I file a lien if the property owner disputes the amount I'm owed?

Yes. You can file a lien for the amount you believe you are owed. If the owner disputes it, they can challenge the lien in court or post a bond. The court will then determine the correct amount. Filing the lien does not mean you will win the dispute, but it gives you leverage to negotiate or litigate.

How much does it cost to file and enforce a mechanics lien?

Recording the lien with the county recorder costs $50 to $150 depending on the county. If you hire an attorney to prepare the lien document, expect to pay $300 to $800. Enforcing the lien through a lawsuit can cost $2,000 to $10,000 or more in attorney fees and court costs, depending on complexity and whether the case goes to trial.