California Mechanic's Lien

What is a California mechanic's lien?

A California mechanic's lien is a legal claim against real property that helps contractors, subcontractors, suppliers, and design professionals collect unpaid construction debts. California lien rights come mainly from the California Civil Code (mechanics lien statutes).

California is a notice-heavy lien state. Many claimants must send a preliminary notice early in the project. Miss that step and you may lose lien rights even when the work was done and the balance is undisputed.

Who can claim a lien?

Parties who provide work, services, or materials that improve real property may have lien rights, including:

• Direct contractors (prime contractors with an owner contract)
• Subcontractors
• Material suppliers
• Equipment lessors in some cases
• Design professionals on qualifying projects

Your role on the job determines which notices and deadlines apply. Direct contractors, subs, and suppliers do not follow identical checklists.

Preliminary 20-day notice

The document California contractors discuss most is the Preliminary Notice (often called the 20-day notice).

In general, subs, suppliers, and others without a direct contract with the owner must serve a preliminary notice to protect full lien rights. Best practice is to send it within 20 days of first furnishing labor, materials, or services.

Key points:

• Serve the owner, general contractor, and construction lender (if any)
• Use statutorily compliant form language
• Keep proof of service (certified mail, courier receipts, etc.)
• Late notices may still protect work furnished after service, but early work can be lost

Direct contractors with an owner contract have different rules, but many still send notice to preserve rights and clarify the chain.

Stop payment notice

California also allows a stop notice on some projects. A stop notice can tie up construction funds held by the owner or lender before they reach a non-paying downstream party.

Stop notices and mechanic's liens are related but different tools. Some contractors use both in a serious non-payment fight. Each has its own forms and deadlines.

Recording the lien

To enforce rights against the property, claimants typically record a mechanic's lien with the county recorder where the work was located.

Deadlines depend on role and project type:

• Direct contractors generally have 90 days after completion of the work to record (shorter if a notice of completion or cessation was recorded)
• Subs and suppliers often have 90 days after completion, but only if preliminary notice requirements were met
• Notice of completion or notice of cessation filed by the owner can shorten deadlines dramatically (sometimes to 30 days or less)

Treat owner-filed completion notices like fire alarms. Calendar your response immediately.

Private works vs public works

This entry focuses on private real property liens. Public works projects use different payment remedies (including stop notices on public funds and bond claims in many cases). Public jobs also trigger California prevailing wage rules.

Lien releases and waivers

Owners and lenders often require lien waivers at each progress payment. California statutory lien waiver forms are common on commercial and residential projects.

Read whether a waiver is conditional (effective on payment) or unconditional (effective on signing). Signing the wrong waiver before funds clear can remove leverage you needed to get paid.

Practical tips for California contractors

Send preliminary notice on every job where you are not the direct owner contractor. Make it a standard onboarding step, not a collections afterthought.

Track notice of completion filings. Subscribe to recorder alerts or assign someone to watch the job file.

Document scope and approvals. Clean contracts, change orders, and invoices support lien amounts if disputed.

Use California counsel on large balances. One wrong date or a defective legal description can void the claim.

Disclaimer

This glossary entry is general information only, not legal advice. California lien deadlines and notice rules change and depend on project facts. Consult a California construction attorney before serving notices or recording a lien.