Legal recourse · Liens

Mechanic's lien: how contractors force payment for unpaid work

Updated June 2026 · 5-minute read

A mechanic's lien (also called a construction or contractor's lien) is the strongest leverage a tradesperson has for unpaid work. It attaches a legal claim to the property you improved, so the owner usually can't sell or refinance until you're paid. It's also strictly deadline-driven and state-specific — miss the window or skip a required notice and you can lose the right entirely. Here's how it works.

How a mechanic's lien works, step by step

1 Confirm you're eligible

Lien rights generally cover those who furnished labor or materials that improved real property — contractors, subs, and many suppliers. Eligibility and who qualifies vary by state, and unlicensed work may not be lienable where a license is required. Confirm your status before you rely on it.

2 Send the preliminary notice (if required)

Many states require a preliminary or 'pre-lien' notice early in the job — sometimes within ~20 days of starting — to preserve your lien rights. Subs and suppliers especially need this. Sending it isn't aggressive; it's standard, and skipping it is how good contractors lose the right to lien.

3 Track the filing deadline

The window to record a lien is short and counts from a specific date — often your last day of work or last material delivery — and ranges roughly 60–120 days depending on the state. Calendar it the day you finish. This deadline is the single most common reason valid liens fail.

4 File (record) the lien

You record a lien claim with the county recorder where the property sits, using your state's form: the property description, the amount owed, the work performed, and the owner's details. Accuracy matters — an over-stated or sloppy lien can be challenged or thrown out.

5 Notify the owner and enforce

After recording, notify the owner. Often the lien alone forces payment, because it blocks a clean sale or refinance. If they still don't pay, you enforce by filing a foreclosure suit within your state's statute — usually the point to bring in a construction attorney.

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FAQ

How long do I have to file a mechanic's lien?

It varies by state, but the window is short — commonly 60–120 days from your last day of work or last material delivery, and some states require an earlier preliminary notice. Treat the deadline as urgent and check your specific state's rule.

Can I file a lien on someone's home?

Often yes for work that improved the property, though residential projects have extra notice requirements and homestead protections in many states. The rules are stricter for homes than commercial property, so confirm your state's residential lien process.

Do I need a lawyer to file a lien?

Recording the lien itself can often be done yourself with the correct state form and deadlines. Enforcing it (foreclosure) is where most contractors bring in a construction attorney. Because the deadlines and notices are unforgiving, many get a quick legal review even for filing.

This is general information for tradespeople, not legal advice. Lien deadlines, small-claims limits, and collection rules vary by state — check your state's rules or talk to a local attorney before acting.