Subcontractor Mechanics Lien Rights in California

California subcontractors, sub-subcontractors, and material suppliers have independent lien rights against the property — even if the property owner has already paid the general contractor in full. This is one of the most powerful protections in California construction law.

The Core Right: Independent Lien Claims

Unlike many states, California's mechanics lien law does not require a subcontractor to prove that the property owner has an unpaid balance due to the general contractor. A sub's lien rights are independent — rooted in the contribution the sub made to the improvement of the property, not in the payment chain above them.

This matters enormously in practice. If a GC is paid by the owner and then fails to pay its subs — whether due to insolvency, fraud, or mismanagement — those subcontractors can still enforce liens against the property.

Preliminary Notice: The Essential First Step

To preserve lien rights, subcontractors and suppliers must serve a 20-day preliminary notice within 20 days of first furnishing labor or materials. This notice must go to the owner, the GC, and the construction lender.

Failing to serve a timely preliminary notice limits lien rights to work performed in the 20 days before actual service. It does not completely extinguish rights, but the limitation can be severe on longer projects.

Filing Deadlines for Subcontractors

• No Notice of Completion filed: 90 days from the last day you furnished labor or materials
• Notice of Completion or Cessation filed: 30 days from the recording of the notice

Stop Payment Notice: A Parallel Remedy

In addition to (or instead of) a mechanics lien, subcontractors can serve a stop payment notice on the construction lender. This requires the lender to withhold funds in an amount equal to the unpaid claim from disbursements to the borrower/GC. The stop payment notice is especially powerful on projects with active construction financing.

Payment Bond Claims

On public works projects and many large private projects, the general contractor is required to post a payment bond. Subcontractors and suppliers can make claims directly against the payment bond — bypassing the property lien process entirely — and often recover faster.

Protecting Yourself Before a Dispute Arises

• Always serve preliminary notice on day one (or within 20 days of starting)
• Request a copy of the payment bond at the start of every project
• Require written change orders for any extra work before performing it
• Keep accurate records of all labor hours, materials delivered, and work performed
• Do not sign unconditional lien waivers until payment has actually cleared

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