Mechanics Lien Guide: How to File and Key Deadlines

Quick answer: A mechanics lien is a legal claim against a property filed by an unpaid contractor, subcontractor or supplier who improved it. To file one, send any required preliminary notices, record a lien claim with the county within your state's deadline (often about 90 days after completion), serve it on the owner, then release it when paid or sue to enforce it before it expires.

For US contractors, the mechanics lien is the strongest collection tool there is. A lien clouds the property's title, so the owner cannot easily sell or refinance until your bill is settled. That leverage comes with strict rules: miss a notice or a deadline by a single day and the right may be gone. This guide explains how a mechanics lien works, who can claim one, how to file it step by step, and the deadlines in four big construction states, with worked date calculations. Make sure your billing records are complete first: every invoice, change order and payment should be documented, ideally with numbered invoices from our US invoice generator.

If your invoices are not yet in order, rebuild them in the invoice generator before you calculate any lien amount.

This post focuses on liens. For progress billing and retainage, see our construction invoice guide. For giving up lien rights in exchange for payment, see our lien waiver guide.

General information, not legal advice. Lien laws are state-specific and highly technical. Rules vary by state and change, so check the current statute for the property's state or speak to a construction attorney.

How a mechanics lien works

A mechanics lien (called a construction lien or materialman's lien in some states) secures your payment against the property you improved, rather than just against the person who hired you. That matters most when you have no contract with the owner: a subcontractor whose general contractor has not paid can still claim a lien on the owner's property, even if the owner has already paid the GC. That is why owners and lenders insist on lien waivers with each payment.

Once recorded, the lien sits on the title. Owners usually resolve it by paying, by pressing the GC to pay, or by posting a bond to release the property. If nobody pays, the claimant must file a lawsuit to foreclose the lien within a fixed time, or the lien lapses.

Who can file a mechanics lien

• Direct or original contractors: those hired by the owner.
• Subcontractors and sub-subcontractors: lien rights usually reach a few tiers down, depending on the state.
• Material suppliers: those who supplied materials for the project, sometimes limited to suppliers to contractors rather than to other suppliers.
• Equipment rental companies: in many states.
• Design professionals: architects, engineers and surveyors in many states.

Some states require a valid contractor license to claim a lien for licensed work, and most bar liens on public property. On public jobs, look to payment bond claims instead.

How to file a mechanics lien: step by step

1. Check eligibility at the start of the job. Confirm the property is private, identify the owner and note the legal description from county records.
2. Send preliminary notices on time. Many states require them, especially for subcontractors and suppliers. Late or missing notices can destroy lien rights.
3. Invoice and document everything. Keep signed contracts, change orders, delivery tickets and dated invoices. Your lien amount must be supported.
4. Try to collect first. Send reminders, a final notice before legal action and, in some states, a required notice of intent to lien.
5. Calculate your deadline. Work out the last date to record from your state's trigger, such as completion, last furnishing or a notice of completion.
6. Prepare the lien claim. Use the state-required content: claimant, owner, hiring party, property description, work supplied and amount owed. Many states require notarisation.
7. Record it with the county recorder or clerk where the property is located and pay the recording fee.
8. Serve the owner and others the statute requires, in the required way and time.
9. Follow up. If paid, record a lien release promptly. If not, file an enforcement action before the lien expires.

Mechanics lien deadlines in four states (as of 2026)

Deadlines are the part contractors get wrong most often. The table below summarises the recording deadline for some of the largest construction markets, based on the current statutes.

State	Recording deadline	Earlier deadline if	Common preliminary notice
California	Direct contractor: 90 days after completion of the work of improvement	60 days after owner records a notice of completion or cessation (30 days for other claimants)	Preliminary notice, generally within 20 days of first furnishing
Texas	15th day of the 4th month after the relevant month (non-residential)	15th day of the 3rd month for residential projects	Monthly notices for claimants who did not contract with the owner
Florida	90 days after final furnishing of labor, services or materials	Earlier date may apply if the original contract is terminated	Notice to Owner for claimants not in privity with the owner
New York	8 months after the last work or materials	4 months for a single-family dwelling	Generally none required for most private jobs

Primary sources include Florida Statutes section 713.08 and Texas Property Code section 53.052, which was rewritten from 1 January 2022. California's rules are in Civil Code sections 8412 and 8414. In California, you must generally also sue to enforce within 90 days after recording, or the lien becomes unenforceable.

Worked example: calculating lien deadlines

Deadlines are counted from specific events, so do the arithmetic in writing and keep the result in the job file.

California direct contractor

Work of improvement completed on 10 March 2026. Ninety days later: 21 days remain in March (to 31 March), 30 in April (51), 31 in May (82), plus 8 days takes you to 8 June 2026. But the owner recorded a notice of completion on 20 March 2026. Sixty days from 20 March: 11 days to 31 March, 30 in April (41), plus 19 days takes you to 19 May 2026. The earlier date controls, so the lien must be recorded by 19 May.

Texas commercial and residential

An original contractor finished a commercial job in June 2026. The deadline is the 15th day of the fourth month after June: 15 October 2026. Had it been a residential project, the third month applies: 15 September 2026.

Florida supplier

Final delivery of materials on 4 August 2026. Ninety days: 27 days to 31 August, 30 in September (57), 31 in October (88), plus 2 days gives 2 November 2026.

The amount to claim

A contractor's original contract is $48,000 and an approved change order adds $3,500, for a revised total of $51,500. The owner has paid $30,000. The lien amount is $51,500 - $30,000 = $21,500. Unapproved extras or disputed charges should not be included without solid support.

Some states let you add interest or certain costs to the lien amount, while others limit it to the value of labor and materials supplied. If you are a subcontractor, your lien may also be capped by what the owner still owes the general contractor in some states, so a quick check of the statute before you record can avoid an overstated claim. Whatever the figure, it should tie back to invoices the owner or GC has already seen: the original contract value, each approved change order, and each payment received. A lien amount that appears for the first time in the lien itself invites a challenge, while one that matches a trail of dated invoices and statements is much harder to dispute.

Preliminary notices: the step people miss

In many states your lien rights depend on notices sent long before payment is late. They tell the owner who is working on the property, which is why they matter so much to subcontractors and suppliers who never meet the owner. Treat them as routine paperwork at the start of every job, not as a hostile act. Many experienced GCs expect them.

• Record the date you first supply labor or materials.
• Send notices by a method that gives proof of delivery.
• Diary any monthly or repeated notices your state requires.
• Keep a copy of each notice with the proof of mailing in the job file.

Some states also require or encourage a notice of intent to lien a set number of days before recording. Even where it is optional, a short letter saying you will record a lien by a stated date unless paid often resolves the debt, because owners and lenders want to avoid a cloud on title. Make sure the date in the letter still leaves time to record before the statutory deadline.

Mechanics lien vs other ways to collect

Remedy	Against	Leverage	Complexity
Demand letter	Your customer	Low to medium	Low
Mechanics lien	The property	High	High: strict notices and deadlines
Payment bond claim	The surety (public and some private jobs)	High	Medium to high
Prompt payment law claim	Owner or GC, for late payment interest	Medium	Medium
Small claims court	Your customer	Medium	Low, within court limits

A demand letter for payment that mentions your lien rights, sent before the deadline, often resolves the debt. Many states also have prompt payment laws that add interest to late construction payments. For smaller amounts or non-construction work, small claims court may be simpler.

Is a lien worth it for this debt?

Before you file, weigh four practical questions:

• Size of the debt: recording costs are modest, but enforcement through a lawsuit costs far more. A lien on a very small balance may not be economic if the owner calls your bluff.
• Equity in the property: if the property is heavily mortgaged, the lender's earlier interest may rank ahead of yours.
• The relationship: a lien on a repeat client's building ends most relationships. Sometimes a payment plan is worth more.
• The strength of your paperwork: missing notices, unsigned change orders or vague invoices give the owner grounds to fight.

After the lien: release or enforce

If the owner pays, record a release of lien promptly; holding on to a paid lien can lead to penalties. If they do not, the lien will not collect money on its own. You must file a foreclosure lawsuit within the state's enforcement period. California generally allows 90 days from recording; other states allow longer, often around a year. Owners may also shorten the timeline in some states by serving a notice to contest the lien.

Common mechanics lien mistakes

• Missing preliminary notices and assuming the lien will still be valid.
• Counting from the invoice date instead of the statutory trigger.
• Naming the wrong owner or using an incomplete property description.
• Overstating the amount, which can invalidate the lien in some states.
• Signing an unconditional lien waiver before payment clears.
• Recording the lien and then forgetting the enforcement deadline.

Keep lien-ready invoices from day one

A mechanics lien is only as good as your paperwork. Issue a numbered, dated invoice for every pay period, show change orders and payments received, and keep copies with your notices. Create them in our free invoice generator, use the invoice number generator to keep sequences clean, and start from a contractor invoice template so every job is billed the same way. If you pour foundations or slabs, our concrete invoice template shows the line items to track. Every invoice exports as a PDF, so it looks the same on your client's phone, laptop or printer.