Mechanic's Liens in California: What Homeowners Need to Know

California's mechanic's lien law is one of the most powerful and misunderstood consumer protection (and risk) features of residential construction. Understanding it before starting a renovation project can protect your property from significant legal complications.

What a Mechanic's Lien Is

A mechanic's lien (also called a construction lien) is a legal claim against your property that a contractor, subcontractor, material supplier, or laborer can record if they're not paid for work or materials on your project.

The critical point that surprises homeowners: You can be subject to a mechanic's lien even if you've paid your general contractor in full, if the general contractor hasn't paid their subcontractors or suppliers.

Example: You hire a GC for $80,000 and pay the full amount. The GC then fails to pay the tile subcontractor $8,000 they're owed. The tile sub can record a mechanic's lien against your property for $8,000. You may have to pay the $8,000 to clear the lien — even though you already paid your GC — and then pursue the GC separately.

The Preliminary Notice

California law gives homeowners an important protection: for a claimant (sub or supplier) to be able to record a valid lien, they must first serve a "Preliminary Notice" (20-Day Notice) on the owner, the construction lender (if any), and the original contractor within 20 days of first furnishing work or materials.

This means:

Any sub or supplier who didn't serve you a preliminary notice within 20 days of starting work loses their lien rights
When you receive preliminary notices (and you will, for any significant renovation), keep them — they tell you who is working on your project and who has lien rights

Don't ignore preliminary notices. Receiving a preliminary notice does NOT mean you've done anything wrong; it's a routine legal notification. It means you now know who has lien rights on your project.

How to Protect Yourself

Conditional Lien Waivers

A conditional lien waiver is a document signed by the claimant (GC, sub, or supplier) stating that in exchange for payment, they waive their lien rights for work performed through a specific date. "Conditional" means the waiver becomes effective when the payment actually clears.

Best practice: Require a conditional lien waiver from your GC and any major subs before each progress payment.

Unconditional Lien Waivers

An unconditional waiver is effective immediately upon signing — it's used after payment has cleared. Request unconditional waivers from all claimants when making final payment.

Joint Checks

For major subcontractors, some owners issue a joint check payable to both the GC and the sub. This ensures the sub is paid directly rather than depending on the GC to forward payment.

Lien Timelines in California

After a private residential project:

Direct contractors (GC): Must record a lien within 90 days of completion of the project
Subcontractors and suppliers: Must record within 60 days of project completion
After recording, the claimant has 90 days to file a lawsuit to enforce the lien

If a claimant misses these deadlines, their lien rights are forfeited.

What to Do If a Lien Is Recorded

Don't panic. A recorded lien is a claim, not a judgment.
Determine if the claimant served a valid preliminary notice and is within the timeline requirements.
Contact the claimant to understand the claim.
If the claim is valid (sub wasn't paid), negotiate resolution — either the GC pays the sub, you pay the sub and deduct from what you owe the GC, or a settlement is reached.
If the claim is invalid, consult a construction law attorney about a lien release bond or petition to release.

We use lien waiver exchanges at every payment milestone in our projects. Contact us for more information on how we structure our contracts to protect clients.