Billing and cash flow

When should a contractor file a mechanics lien?

File when a payment is past due, normal collection has stalled, and your state deadline is close enough that waiting would cost you the right. The deadline, not your patience, sets the date.

An office manager and contractor review invoices with a calculator and laptop in a construction office.
Review invoices, committed costs, and cash timing together before making project decisions. AI-generated illustration.

The short answer: file a mechanics lien once a payment is clearly overdue and your state's recording deadline is getting close, and never after that deadline passes. Every state sets its own window, usually counted from your last day of work or delivery, or from when the project is completed. Miss it and the lien right is gone, no matter how much you are owed. So the real question is not whether you feel ready to file. It is how many days you have left.

That makes lien timing a calendar problem first and a relationship problem second. Most contractors who lose lien rights do not lose them in court. They lose them by waiting politely for a check that never comes.

What starts the mechanics lien clock

Before you can decide when to file, you need to know which event starts the count in your state. The common triggers are:

  • Last furnishing: the last day you performed work or delivered materials on the job. Warranty or punch work often does not count, so do not assume a return trip resets the clock.
  • Completion of the project: the whole job, not just your scope. A drywall sub can finish in March on a job that completes in August.
  • Recorded notice of completion or cessation: in some states an owner can record a notice that shortens everyone's window.

Florida is a clean example. Its statute requires a claim of lien to be recorded no later than 90 days after the lienor's final furnishing of labor, services, or materials, and a copy must be served on the owner before recording or within 15 days after recording. Other states count differently, use different days for prime contractors and subs, or split residential from commercial work. Check your state on the mechanics lien laws by state hub before you rely on any number.

A step-by-step way to decide when to file

1. Confirm you protected the right in the first place

Many states require a preliminary notice or notice to owner early in the job, especially from subs and suppliers who have no direct contract with the owner. If you skipped it, you may have no lien right to file. See how to send a preliminary notice so this does not happen on the next job.

2. Write down your last furnishing date the day it happens

Pull it from the daily log, the delivery ticket, or the timesheet. Put it on the job record, not in someone's memory. Disputes over lien timing almost always come down to this date.

3. Calculate the deadline and set two earlier alarms

Count forward to the statutory deadline. Then set an internal decision date about 30 days before it and a hard "file now" date about 10 days before it. Recording offices, notaries, and legal descriptions all take time.

4. Escalate collection before the decision date

Send a clear past-due notice. Call the person who approves payment, not just accounts payable. If your state uses one, a notice of intent to lien often gets paid faster than the lien itself, because it tells the owner a cloud on title is coming.

5. At the decision date, file unless payment is certain

"Certain" means money in your account or a signed, dated payment commitment you trust. A promise that the check is being cut is not certainty. If it is not in hand, record the lien and serve it as your state requires.

6. Calendar the enforcement deadline

Recording a lien is not the end. States also set a deadline to file suit to foreclose it, and a lien that is not enforced in time expires. Add that date the same day you record.

Worked example: a framing sub on a commercial job

Say a framing subcontractor finished its last work on a Florida retail job on June 3. The contract balance is $62,000, including $18,500 of retainage and a $9,200 approved change order.

Example lien calendar for a June 3 last furnishing date (Florida 90-day window)
DateMilestoneAction
June 3Last furnishingRecord the date in the job file
July 3Payment 30 days latePast-due letter and call to the GC's PM
August 1Internal decision dateFinal demand, notice of intent if used
August 22File-now datePrepare and record the claim of lien
September 1Statutory deadline (90 days)Too late after this

The GC keeps saying the owner has not released funds. By August 1 nothing has moved. The sub's office manager sends a final written demand with a copy of the draft lien. On August 22, still unpaid, they record the lien and serve the owner within the service window. That is the textbook timeline: friendly for 60 days, firm at the end, and never past the deadline.

Change the facts and the timeline changes. If the sub had a pay-if-paid clause, the lien may be the only way to reach the owner's money at all.

When not to file a mechanics lien

Some situations call for a different tool:

  • Federal projects. You cannot lien federal property. The Miller Act payment bond is the remedy instead. A party with a contract with a subcontractor, but none with the prime, must give the prime written notice within 90 days of its last labor or materials, and suit must be brought within one year of the last labor. See how the Miller Act protects subcontractors.
  • Most state and local public jobs. These usually rely on a payment bond claim, not a lien on public property. The notice rules are state specific.
  • When you signed an unconditional waiver. An unconditional lien waiver for a payment you never received can wipe out rights for that amount. Read conditional vs unconditional lien waivers.
  • When the amount is disputed in good faith. Liening for more than you are owed can create liability in some states. File for the undisputed amount and document the rest as a claim.

Mistakes that cost contractors lien rights

  1. Counting from the invoice date instead of the last furnishing date.
  2. Assuming a punch-list return or warranty visit restarts the clock.
  3. Waiting on a GC's "next draw" promise until the window closes.
  4. Using the wrong legal description or owner name, which can invalidate the lien.
  5. Recording the lien but forgetting to serve it, or to enforce it before it expires.
  6. Signing unconditional waivers before the money clears.

Tools that make lien timing routine

Lien rights are lost through missing dates, so treat them like any other recurring deadline. Keep the preliminary notice date, last furnishing date, recording deadline, and enforcement deadline on every job. Pair that with clean billing so the amount you lien is defensible, which starts with a solid pay application and an accurate retainage tracking template.

Smart Business Automator keeps invoices, change orders, and job dates together, so the office can see which jobs are past due and how close each one is to its lien deadline. The construction accounts receivable automation page shows how past-due follow-up and reminders work.

Frequently asked questions

How soon can I file a mechanics lien?

In most states you can record once payment is due and unpaid, as long as you met any preliminary notice rules. Some states also set a waiting period or require a notice of intent first, so check your state's rules before recording.

Does filing a lien ruin the relationship with the GC?

It can strain it, which is why a final demand or notice of intent usually comes first. Many GCs and owners expect liens as a routine step when payment stalls, and a lien often moves money that was stuck between the owner and the GC.

Can I file a lien for retainage?

Generally yes, retainage is part of what you are owed. The catch is timing: retainage is often released after your lien window has closed, so you may need to file before it is due if payment looks uncertain.

What if I miss the lien deadline?

The lien right is usually lost. You may still have a contract claim, a payment bond claim, or a prompt payment claim, but those are slower and have their own deadlines.

Do I need a lawyer to file a mechanics lien?

Not always, and many contractors record their own. Errors in the legal description, amount, or service can invalidate a lien, so many use an attorney or a lien service for large balances or contested jobs.

Sources

  1. Florida Statutes 713.08: Claim of lien
  2. 40 U.S.C. 3133: Rights of persons furnishing labor or material (Cornell LII)
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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