Not been paid? The mechanic's lien is your strongest move.

A mechanic's lien is a legal claim you put on the property you worked on when you have not been paid, and it is the most powerful tool a contractor has. Here is why: the lien attaches to the property itself, not just to the person who owes you. Once it is on record, the owner cannot cleanly sell, refinance, or borrow against that property until you are paid or the lien is cleared. That is real leverage, and it works. Most liens get paid without a lawsuit ever being filed, purely because the lien exists.‍‌‌‌​​​​​​​​​‌​​​​​‌‌‌‌‌‌​​‌‌‌‌​‍

But it runs on short, strict deadlines that are different in every state, and the single biggest mistake contractors make is waiting. The first step usually has to happen when you start the job, not when the check goes bad. Miss it and you can lose the right to lien at all. So the move is simple: protect yourself early on every job, and know your state's clock. Check the Mechanic's Lien Deadline tool for your exact dates.

Why it is so strong

You do not have to sue first or win a hearing to record a lien. You file it against the property, it clouds the title, and that alone usually gets you paid. Two things make it even stronger. If the general contractor takes the money and disappears, you still have a claim against the property, because the owner is ultimately responsible for making sure the people who improved it get paid, even if they already paid the GC. And in many states the lien relates back to the first day work started, which can put you ahead of a bank's mortgage recorded later.

Who can use it

Lien rights run down the chain, but not forever:

• General contractors, subcontractors, and in most states their subs.
• Laborers, for wages on the work.
• Material suppliers, if their materials actually went into the project, not just got delivered to the yard.
• A supplier who sold to another supplier: no, that is barred almost everywhere.

One hard warning: if your state requires a license for your trade and you were not licensed, you usually forfeit your lien rights completely. No license, no lien.

The three steps

1. The preliminary notice, at the START of the job. This is the one people skip and regret. It goes by different names in different states (Notice to Owner, 20-Day Notice, Notice of Furnishing, Pre-lien Notice), and around 40 states require it. It does not create a lien. It is the ticket that lets you file one later if you are not paid. Send it on every job, at the start, whether or not your state strictly demands it. In some states you get as little as a week or two after you first show up, and a late notice only protects your most recent work.
2. Record the lien, when payment is overdue. You prepare a Claim of Lien (the name varies) and record it with the county recorder where the property sits. It has to state the owner, the property, who hired you, the work, the amount, and your first and last dates on the job. The filing fee is usually well under a few hundred dollars, and most states make you serve a copy on the owner within a few days of recording.
3. Enforce it, if they still do not pay. A lien is not forever. If it works, they pay and you release it. If it does not, you have to file a foreclosure lawsuit within your state's window or the lien simply expires. Foreclosure is a real, expensive lawsuit, so that stage is where you want an attorney.

Two things that will sink you

• Deadlines. Every step has one, they are short, and they are state-specific. Lien law is strictly construed, which means a small technical slip that a normal contract claim would forgive, like a wrong property description or a missed date, can void the entire lien. Get the dates for your state from the Mechanic's Lien Deadline tool and treat them as hard.
• Doing it wrong. For a few thousand dollars, plenty of contractors file the lien themselves (the forms are short and the county recorder's site usually has them) or use a lien service for a few hundred. For larger or contested amounts, get a construction attorney. A botched lien is worse than none, because it wastes the one shot you had.

A note on public jobs

You cannot lien government property, so a mechanic's lien is off the table on public work. Instead you make a claim against the project's payment bond. Different process, same idea, and it has its own strict deadlines.

Common questions

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

Not long, and the exact number is different in every state, so treat it as a hard deadline and confirm yours. The clock to record the lien usually runs from your last day of work or last delivery on the job. There is often an earlier clock too: the preliminary notice at the start of the job. Both are short and strictly enforced, and a missed one can cost you the lien entirely. Get your exact dates from the Mechanic's Lien Deadline tool.

Can I file a lien if the homeowner already paid the general contractor?

In most states, yes. The owner is ultimately responsible for making sure the people who improved their property get paid, even if they already paid the GC and the GC never passed it on. That is the double-payment risk, and it is what gives your lien its bite. A few states and some homestead rules complicate it, so check Working in Your State.

Do I lose my lien rights if I'm not licensed?

Usually yes, completely. Where your state requires a license for your trade and you were not licensed for the work, you typically forfeit lien rights altogether, no matter how good the work was or how much you are owed. No license, no lien. Whether your trade needs a license, and at what level, is a state question, so see Working in Your State.

Does filing a lien mean I have to take the owner to court?

No, and most liens never see a courtroom. Recording the lien clouds the title, and that pressure alone is what gets most claims paid, with no lawsuit. Court only comes in if they still refuse to pay, when you would file a foreclosure suit within your state's window. That later stage is where you want an attorney.

Can I put a lien on a house for unpaid work?

Yes, if it is private property, you improved it, and you meet your state's notice and deadline rules. A mechanic's lien attaches to the home or building you worked on and blocks a clean sale or refinance until you are paid. You cannot lien government property, and you must file within your state's short window, so confirm your dates in the Mechanic's Lien Deadline tool.

The honest bit

• Deadlines, notice rules, and who can file all vary by state, and they change. Use the per-state tool for your dates and confirm them before you rely on them.
• This is general guidance, not legal advice. For a real dispute, a large amount, or anything already heading for court, talk to a construction attorney early. On liens, early is everything.

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