Filing a mechanics lien in California requires written notice to the property owner within 30 days of last work, a completed lien form with specific property and labor details, and recording at the county recorder's office before the statute of limitations expires — typically 90 days after the last date you provided labor or materials.

A mechanics lien is a legal claim against a property that secures payment for work or materials you supplied. In California, the process is governed by the Mechanics Lien Law (found in the California Civil Code, sections 8000–8800). Unlike a general debt, a lien attaches to the property itself, which means the property owner cannot sell or refinance without addressing your claim.

The timeline is strict. You must send a preliminary notice to the property owner, general contractor, and construction lender within 20 days of first providing labor or materials — this notice tells them you might file a lien. Then, after you stop work and are not paid, you have 90 days from your last date of work to record the actual lien document at the county recorder's office. Missing these important date forfeits your lien rights entirely.

Key Takeaways

  • You must send a preliminary notice within 20 days of starting work; failure to do so may reduce the amount you can later claim in a lien.
  • The mechanics lien itself must be recorded at the county recorder's office within 90 days of your last date of work or material delivery.
  • Your lien document must include the property address, owner name, description of work performed, dates of work, and the amount owed — vague or incomplete forms are rejected or challenged in court.
  • After recording, you have 90 days to file a lawsuit to enforce the lien; if you do not sue within that window, the lien expires and becomes unenforceable.
  • Homeowners and property owners can remove a lien by posting a bond equal to 150 percent of your claimed amount, which shifts your claim from the property to the bond.

The preliminary notice requirement and what it covers

Before you can file a mechanics lien, California law requires you to send a preliminary notice to three parties: the property owner, the general contractor (if there is one), and the construction lender (if the work is financed). This notice must be sent within 20 days of the first day you provide labor, services, equipment, or materials to the project.

The preliminary notice does not have to be fancy. It can be a straightforward letter or form that includes your name and address, the property address, a description of the work or materials you will provide, and the name of the person who hired you. Many contractors use the California Preliminary Notice form (available from the California Contractors State License Board), but a plain letter works if it contains the required information.

Why does this matter? If you fail to send the preliminary notice within 20 days, you lose the right to claim a lien for any work or materials provided before the notice was sent. This is a hard rule — courts do not grant exceptions for good faith mistakes. If you discover you missed the important date, you can still send the notice when ready, but your lien will only cover work done after the notice is sent.

Send the preliminary notice by certified mail, email, or personal delivery. Keep proof of delivery. If you cannot locate the property owner or lender, document your good-faith effort to find them — this protects you if the owner later claims they never received notice.

Gathering the information needed for your lien document

Your mechanics lien form must contain specific information or it will be rejected by the county recorder or challenged in court. Before you sit down to fill it out, collect these details:

  • Property address: The street address, city, and county where the work was performed. If the property has a legal description (lot and block number), include that too — you can find it on the property deed or the county assessor's website.
  • Property owner's name: The person or entity that owns the property. This is not always the person who hired you. Check the county recorder's records or the property deed to confirm.
  • Your name and address: Your full legal name and mailing address. If you are a business, use the business name and address.
  • The person who hired you: The name of the contractor, subcontractor, or property owner who contracted with you for the work.
  • Description of work or materials: A clear, specific account of what you provided — for example, "framing labor, 40 hours at $50/hour" or "electrical materials and installation for kitchen remodel." Vague descriptions like "construction services" are weak and invite challenge.
  • Dates of work: The first and last dates you provided labor or materials. This is critical because your 90-day filing important date runs from the last date of work.
  • Amount owed: The total dollar amount you are claiming. This should match invoices or contracts you have.

If you are missing any of this information, contact the general contractor, the property owner, or the county assessor's office to fill in the gaps. A lien with missing or incorrect information can be removed by the property owner in court.

Completing and recording the lien form at the county recorder

California does not have a single state-mandated lien form, but the county recorder's office in the county where the property is located will accept a form that meets the legal requirements. Many county recorders provide their own template or accept the California Preliminary Notice form adapted for recording. Call or visit the recorder's website to ask what form they prefer and whether they have a template.

The lien document must be signed and notarized. You will need to go to a notary public (often available at banks, UPS stores, or online) and sign the document in front of them. The notary will stamp and sign it, confirming your identity. This step is not optional — an unnotarized lien will be rejected.

Once notarized, take or mail the original lien document to the county recorder's office in the county where the property is located. Include a cover sheet (the recorder will provide a template), the notarized lien, and the recording fee. Fees vary by county but typically range from $50 to $100. Some recorders accept payment by check, credit card, or online portal.

The recorder will stamp the document with the recording date and number, then return a copy to you. This recorded copy is your proof that the lien was filed. Keep it in a safe place — you will need it if you later have to sue to enforce the lien or if the property owner challenges it.

The 90-day important date runs from your last date of work, not from the date you record the lien. If your last day of work was January 15, you must record the lien by April 15, even if you only learned the owner was not paying on March 1. Missing this important date means the lien is void.

What happens after you record the lien

Once recorded, your lien is a public record. The property owner will likely discover it when they try to refinance, sell, or obtain a loan. At that point, they have three main options: pay you, post a bond, or go to court to challenge the lien.

If the owner posts a bond, they are putting up cash or a surety bond equal to 150 percent of your claimed lien amount. This removes the lien from the property and transfers your claim to the bond. You can still pursue payment, but now you are claiming against the bond instead of the property. This is often faster than waiting for a sale or refinance.

If the owner disputes the lien, they can file a lawsuit asking the court to remove it. Common grounds for removal include claiming the work was not performed, the amount is wrong, or the preliminary notice was not sent properly. If you are sued, you will need to prove your work, your dates, and your costs — keep detailed records, photos, invoices, and timesheets.

You have 90 days from the date you record the lien to file a lawsuit to enforce it. If you do not sue within 90 days, the lien expires and becomes unenforceable. This does not mean you lose the right to collect the debt — you can still sue for the money — but you lose the special power of the lien, which is the ability to force a sale of the property to pay you.

Common reasons liens are rejected or removed

The county recorder will reject a lien if it is missing required information, is not notarized, or does not include a valid legal description of the property. If this happens, you will receive a notice explaining what is wrong. You can correct the document and resubmit it, but your 90-day important date still runs from your last date of work — resubmitting does not extend the important date.

Property owners often challenge liens in court on these grounds: the preliminary notice was not sent within 20 days, the lien was recorded after 90 days, the work was not performed as described, the amount claimed is inflated, or the lien was filed by someone without the right to file (for example, a supplier who did not have a direct contract with the owner or general contractor).

To defend against a challenge, you need documentation: signed contracts or purchase orders, invoices, timesheets, photos of the work, delivery receipts, and proof that you sent the preliminary notice. If you cannot produce these, the court is likely to remove the lien. Start keeping records the day you are hired, not after a dispute arises.

When you should consider hiring an attorney

Filing the lien yourself is straightforward if the facts are clear — you did the work, you have documentation, and the owner straightforward has not paid. In that case, a notary and the county recorder are all you need.

You should consult an attorney if the owner challenges the lien in court, if the preliminary notice important date is unclear or may have been missed, if multiple parties are involved and it is not clear who hired you, or if the amount owed is large enough to justify the cost of legal help. An attorney can also advise you on whether filing a lien is the best strategy or whether small claims court, demand letters, or collection agencies might be faster or cheaper.

California allows you to recover attorney fees if you win a lien enforcement lawsuit, so the cost of hiring a lawyer may be paid by the property owner at the end. Many construction attorneys work on contingency or offer flat fees for lien work.

Frequently Asked Questions

What if I did not send a preliminary notice within 20 days?

You lose the right to claim a lien for any work done before the notice was sent. Send the notice when ready. Your lien will only cover work performed after the notice is sent, and you will have 90 days from your last date of work to record it.

Can I file a lien if I was paid in part but not in full?

Yes. Your lien covers the unpaid balance only. If you were paid $5,000 of a $10,000 contract, you can file a lien for $5,000. Make sure your lien document clearly states the total amount owed and any payments received.

What if the property owner is a corporation or LLC?

You must name the actual owner of record at the county assessor's office, not the company that hired you. If the general contractor is an LLC but the property owner is an individual, the lien goes against the individual's property. Use the county assessor's website or a title search to confirm the owner's legal name.

Can the property owner remove my lien by paying me after I record it?

Yes. Once you are paid in full, you must file a release of lien at the county recorder's office. This removes the lien from the public record. If you do not file a release after being paid, the owner can sue you for wrongful lien.

What if I miss the 90-day important date to record the lien?

Your lien rights are gone. You can no longer file a mechanics lien, but you can still sue the owner for breach of contract or payment in small claims court or civil court, depending on the amount owed. You will not have the advantage of a lien against the property.