What Is a Mechanic's Lien?

A mechanic's lien is a legal claim against a property, filed by a contractor, subcontractor or supplier who improved it and wasn't paid. It clouds the title until the debt is paid or the lien is released, and it can be foreclosed. Every state sets strict notice, filing and lawsuit deadlines; miss one and the lien is lost.

How does a mechanic's lien work?

A mechanic's lien works by turning an unpaid construction bill into a claim on the property itself. If you add value to real estate (framing, wiring, a new roof, a furnace install) and don't get paid, state law lets you record a lien in the county records. The owner can't sell or refinance cleanly until it's resolved, and if nobody pays, you can sue to force a sale.

The right exists because of the work, not because of a contract clause. That's also why it's fragile: the lien is a statutory remedy, and courts read the statute strictly. A lien recorded a day late, sent to the wrong party, or missing a required notice is usually unenforceable.

The three deadlines that matter

1. 1

   Preliminary notice (sometimes called notice to owner).

   Many states require subcontractors and suppliers to warn the owner early that they're on the job. In California it's due within 20 days of starting work; in Florida within 45 days.

2. 2

   Recording the lien.

   The lien claim (also called a claim of lien or lien affidavit) must be recorded with the county within a set period after you finish or stop work. Ninety days is common, but it ranges from month-based deadlines in Texas to eight months in New York.

3. 3

   Enforcing the lien.

   A recorded lien expires unless you file a lawsuit to foreclose it in time: 90 days after recording in California, six months in Arizona, one year in Florida and New York.

Mechanic's lien deadlines by state

Deadlines vary more than most owners expect. The table below quotes six state statutes or state agency guides, checked on October 12, 2026. It covers private residential and commercial work; public projects usually use payment bonds instead of liens.

A worked example: a roofing sub who didn't get paid

Notice what made this lien work: an early notice, a calendar entry for every deadline, and an amount backed by invoices. That paper trail is the same one you need to collect unpaid invoices before a lien is even on the table.

Who can file a mechanic's lien?

Generally, anyone who supplies labor, materials or certain professional services to improve private property can claim a lien: general contractors, subcontractors, sub-subs, material suppliers, equipment renters and, in many states, laborers. Some states also cover architects, engineers and surveyors.

• Direct (original) contractors usually don't need a preliminary notice, but must still record and enforce on time.
• Subcontractors and suppliers typically must send preliminary notices to keep their rights. In Florida, failing to serve the notice to owner is a complete defense to the lien.
• Unlicensed contractors often can't lien at all. Florida makes contracts by unlicensed contractors unenforceable by the contractor (Fla. Stat. § 489.128). See contractor license.
• Public projects usually can't be liened. Claimants look to the contractor's payment bond instead. See surety bond.

Mechanic's liens by trade

Mechanic's lien vs. lien waiver vs. payment bond

A mechanic's lien is the claim; a lien waiver is the document where you give up that claim, usually in exchange for a payment. On public jobs, and on some private ones, a payment bond replaces lien rights: instead of liening the property, you claim against the surety that issued the bond. The deadlines for bond claims are different again, so check them separately.

Liens also interact with retainage. Texas, for example, sets a separate deadline for subcontractors claiming a lien for retainage: the 15th day of the 3rd month after the original contract is completed, terminated or abandoned (Tex. Prop. Code § 53.052(d)).

Common mistakes that kill lien rights

1. Counting from the wrong date. "Completion" means different things in different statutes. Small punch-list or warranty work often doesn't extend the deadline.
2. Skipping the preliminary notice. Subs who wait until they're unpaid to think about liens have often already lost them.
3. Overstating the amount. Some states penalize willfully exaggerated liens. Lien only for work performed, not lost profit on the rest of the job.
4. Signing an unconditional waiver before the check clears. That can give up the lien for money you never received.
5. Recording but never suing. A recorded lien expires on its own if you don't enforce it in time.
6. Wrong county or wrong legal description. Record where the property sits, with the description from the deed.

How to protect your lien rights on every job

• Collect the owner's name, the property's legal description and any lender at the start of every job.
• Send preliminary notices as standard practice, not as a threat. Owners and GCs on well-run jobs expect them.
• Bill in documented stages with progress billing, so each invoice shows the work and dates it covers.
• Log the last day you furnished labor or materials. That date drives most deadlines.
• Put every notice, recording and lawsuit deadline on a calendar the day the job starts.
• Check your state's rules in our state tax and licensing guides and with an attorney before recording.