Mechanics Liens in New York: The Deadlines That Decide Who Gets Paid

By Eugene Bondar, Esq. · Updated September 29, 2026

If you furnish labor or materials to a construction project and don’t get paid, a mechanics lien is often your most powerful remedy: it attaches your claim directly to the property itself. But lien rights are a use-it-or-lose-it proposition, and the simplest way to lose them is waiting too long.

New York’s Lien Law is unusually forgiving on the front end (Lien Law § 10 imposes no pre-filing notice requirement) and unusually strict on the back end. Every step after the work stops runs on a statutory clock.

Every New York mechanics lien deadline, in one place

What you must do	Deadline
File the notice of lien: most private projects	”within eight months after the completion of the contract, or the final performance of the work, or the final furnishing of the materials, dating from the last item of work performed or materials furnished” (Lien Law § 10(1))
File the notice of lien: single-family dwelling	”within four months” of the same events (§ 10(1))
File a lien for retainage	”within ninety days after the date the retainage was due to be released” (§ 10(1))
Serve the notice of lien on the owner (§ 11) and, by certified mail, on the contractor or subcontractor you worked for (§ 11-b)	“Within five days before or thirty days after filing the notice of lien”
File proof of service with the county clerk	”within thirty-five days after the notice of lien is filed” or the notice terminates as a lien (§§ 11, 11-b)
Foreclose (and file a notice of pendency) or extend the lien	Within “one year after the notice of lien has been filed” (§ 17)
Extend by county clerk filing (property other than a single family dwelling)	“within one year from the filing of the original notice of lien”; “[n]o lien shall be continued by such extension for more than one year from the filing thereof” (§ 17)
Any further extension, or any single-family extension	”an order be granted by a court of record” (§ 17)
Respond to an owner’s § 59 notice	Commence the action within the time the notice specifies, “not less than thirty days from the time of service,” or show cause (§ 59)

The rest of this post explains where each of these comes from and how they trip people up.

The clock starts before you think it does

The filing window under Lien Law § 10(1) runs “after the completion of the contract, or the final performance of the work, or the final furnishing of the materials, dating from the last item of work performed or materials furnished” (not from when your invoice went unpaid, and not from when negotiations broke down). The statute also permits filing “at any time during the progress of the work and the furnishing of the materials,” and sometimes that is exactly the right move. But by the time many contractors accept that a payment dispute is real, a substantial part of the window is already gone.

Two traps inside this rule. First, going back to the site for repair or warranty work after the contract work is done does not necessarily move the date. In Nelson v. Schrank, 273 App. Div. 72, 73 (2d Dep’t 1947), the contract work was finished in January 1944, the contractor repaired a faucet that June, and the lien filed in July was held “invalid because it was not filed within the time required by section 10 of the Lien Law”: there “was no proof that the extra work … was part of the … contract, nor that it was anticipated when the original contract was made, nor that it was in continuance of any work done under that contract.” The First Department has framed the question as whether work performed within the statutory period “was performed pursuant to the parties’ contract, or constituted warranty or repair work, or new work outside the parties’ contract” (72 Pyrgi, Ltd. v. Gkam Corp., 293 A.D.2d 387, 388 (1st Dep’t 2002)). Second, the four-month window applies “where the improvement is related to real property improved or to be improved with a single family dwelling” (§ 10(1)), a fact subcontractors working through a GC sometimes never confirm until it’s too late. (Section 10(1) carves out of “single family dwelling” a unit in a filed subdivision that a developer owns “for purposes other than his personal residence” at the time the lien is filed.)

Filing is only step one

A lien that is filed must also be perfected. Under § 11, “[w]ithin five days before or thirty days after filing the notice of lien, the lienor shall serve a copy of such notice upon the owner.” Under § 11-b, in the same window “the lienor shall serve a copy of such notice … by certified mail on the contractor, subcontractor, assignee or legal representative for whom he was employed or to whom he furnished materials,” and a lienor “having a direct contractual relationship with a subcontractor or a sub-subcontractor but not with a contractor shall also serve a copy … to the contractor.” Both sections provide that “[f]ailure to file proof of such a service with the county clerk within thirty-five days after the notice of lien is filed shall terminate the notice as a lien.”

Service is not a formality. “Until service of the notice has been made … an owner, without knowledge of the lien, shall be protected in any payment made in good faith to any contractor or other person claiming a lien” (§ 11), meaning the fund your lien attaches to can shrink, dollar by dollar, while your notice sits unserved.

Accuracy matters just as much. Under § 39, “if the court shall find that a lienor has wilfully exaggerated the amount for which he claims a lien as stated in his notice of lien, his lien shall be declared to be void and no recovery shall be had thereon,” and “[n]o such lienor shall have a right to file any other or further lien for the same claim.” Section 39-a adds real teeth: where the lien is declared void for wilful exaggeration, “the person filing such notice of lien shall be liable in damages to the owner or contractor,” including “the amount of any premium for a bond given to obtain the discharge of the lien or the interest on any money deposited for the purpose of discharging the lien, reasonable attorney’s fees for services in securing the discharge of the lien, and an amount equal to the difference by which the amount claimed to be due or to become due as stated in the notice of lien exceeded the amount actually due or to become due thereon.” Round numbers, padded change orders, and “negotiating positions” have no place in a notice of lien. An itemized, documented claim gets paid; an inflated one produces motion practice, or a counterclaim.

You have one year, then the lien dies

Under § 17, “[n]o lien specified in this article shall be a lien for a longer period than one year after the notice of lien has been filed, unless within that time an action is commenced to foreclose the lien, and a notice of the pendency of such action … is filed with the county clerk,” or unless an extension, “except for a lien on real property improved or to be improved with a single family dwelling, is filed with the county clerk … within one year from the filing of the original notice of lien.” “No lien shall be continued by such extension for more than one year from the filing thereof,” and if no foreclosure action is commenced within the extended period the lien “shall be extinguished unless an order be granted by a court of record or a judge or justice thereof, continuing such lien.” A lien on a single family dwelling “may only be extended by an order of a court of record, or a judge or justice thereof.” Under § 19(2), a private-improvement lien is discharged “[b]y failure to begin an action to foreclose such lien or to secure an order continuing it, within one year from the time of filing the notice of lien,” subject to the exceptions stated there.

Owners can compress this timeline. A notice served under § 59 “shall require the lienor to commence an action to enforce the lien, within a time specified in the notice, not less than thirty days from the time of service, or show cause … why the notice of lien filed or the bond given should not be vacated and cancelled.” If you hold a lien and receive one, the response window is short and the consequence of ignoring it is losing the lien.

Filing the foreclosure itself is technical: it is a real litigation, § 44 lists the “necessary parties defendant” who must be joined, and under CPLR 321(a) “a corporation or voluntary association shall appear by attorney.” This is the stage where a well-built demand letter and a credible readiness to try the case tend to produce the settlement.

Public projects run on different rules

Liens on public improvements (schools, roads, municipal buildings) don’t attach to the property at all. Under Lien Law § 5 the lien is “upon the moneys of the state or of such corporation applicable to the construction or demolition of such improvement, to the extent of the amount due or to become due on such contract.” Under § 12 the notice may be filed “[a]t any time before the construction or demolition of a public improvement is completed and accepted by the state or by the public corporation, and within thirty days after such completion and acceptance,” and it is filed “with the head of the department or bureau having charge of such construction or demolition and with the comptroller of the state or with the financial officer of the public corporation,” not the county clerk. If your unpaid work is on a public job, the analysis changes from the first step; see the firm’s construction & infrastructure and government procurement practices.

What owners should know

If a lien has been filed against your property, you have tools as well, several of them time-sensitive. Under § 38 a lienor “shall, on demand in writing, deliver to the owner or contractor making such demand a statement in writing which shall set forth the items of labor and/or material and the value thereof which make up the amount for which he claims a lien”; if the lienor “shall fail to comply with such a demand within five days” or “delivers an insufficient statement,” the owner may petition for an order directing compliance, and if that order is ignored the court “may make an order cancelling the lien.” You can discharge the lien by “executing a bond or undertaking in an amount equal to one hundred ten percent of such lien” (§ 19(4)) to clear title while the dispute plays out; apply for an order “summarily discharging of record the alleged lien” where “it appears from the face of the notice of lien that the claimant has no valid lien” or the notice fails to comply with § 9 or was not filed in accordance with § 10 (§ 19(6)); or serve the § 59 notice and put the lienor to its proof. Which tool fits depends on whether you dispute the debt, the amount, or just need clean title for a closing or refinance.

The practical takeaway

Whether you are owed money or a lien just hit your property, the calendar is the first thing a lawyer should look at; every option above gets narrower with time. This firm handles lien filings, foreclosures, defenses, and the payment-clause disputes behind them, as Rockland County construction and business counsel and across New York and Northern New Jersey. The initial consultation is free.

Related services: Civil Litigation & Disputes · Construction & Infrastructure · Rockland County Construction Disputes

Attorney Advertising. This post is for general informational purposes only and does not constitute legal advice. Deadlines vary by project type and circumstance; consult an attorney about your specific situation.

Frequently asked questions

How long do I have to file a mechanics lien in New York?

Lien Law § 10(1) permits a notice of lien to be filed "at any time during the progress of the work and the furnishing of the materials, or, within eight months after the completion of the contract, or the final performance of the work, or the final furnishing of the materials, dating from the last item of work performed or materials furnished." Where the improvement is related to "a single family dwelling," the window is "within four months." And "where the notice of lien is for retainage, the notice of lien may be filed within ninety days after the date the retainage was due to be released."

When does the filing clock start running?

Lien Law § 10(1) measures the window "dating from the last item of work performed or materials furnished," not from the date of your unpaid invoice, and not from when settlement talks break down. Going back later for repair or warranty work does not necessarily move that date. In Nelson v. Schrank, 273 App. Div. 72, 73 (2d Dep't 1947), the contract work was finished in January 1944, the contractor repaired a faucet that June, and the lien filed in July was held "invalid because it was not filed within the time required by section 10 of the Lien Law": there "was no proof that the extra work ... was part of the ... contract, nor that it was anticipated when the original contract was made, nor that it was in continuance of any work done under that contract." The First Department has framed the question as whether work performed within the statutory period "was performed pursuant to the parties' contract, or constituted warranty or repair work, or new work outside the parties' contract" (72 Pyrgi, Ltd. v. Gkam Corp., 293 A.D.2d 387, 388 (1st Dep't 2002)).

How long does a New York mechanics lien last once filed?

Under Lien Law § 17, no lien "shall be a lien for a longer period than one year after the notice of lien has been filed, unless within that time an action is commenced to foreclose the lien, and a notice of the pendency of such action ... is filed with the county clerk," or unless an extension, "except for a lien on real property improved or to be improved with a single family dwelling, is filed with the county clerk ... within one year from the filing of the original notice of lien." "No lien shall be continued by such extension for more than one year from the filing thereof," and after that the lien "shall be extinguished unless an order be granted by a court of record" continuing it. A lien on a single family dwelling "may only be extended by an order of a court of record."

Do I have to serve the lien after filing it?

Yes. Under Lien Law § 11, "[w]ithin five days before or thirty days after filing the notice of lien, the lienor shall serve a copy of such notice upon the owner," and "[f]ailure to file proof of such a service with the county clerk within thirty-five days after the notice of lien is filed shall terminate the notice as a lien." Section 11-b imposes the same windows for service by certified mail on the contractor or subcontractor for whom the lienor worked. Until service, "an owner, without knowledge of the lien, shall be protected in any payment made in good faith to any contractor or other person claiming a lien" (§ 11).

I'm past the deadline. Do I still have a claim?

Lien Law § 10(1) says the notice of lien "may be filed" within the periods it states, and the section contains no provision for extending them. But the underlying claims usually survive: breach of contract, quantum meruit, and, on some projects, payment bond claims (State Finance Law § 137 on public improvements) or trust fund claims under Lien Law Article 3-A, which makes funds received by an owner, contractor, or subcontractor for an improvement "assets of a trust" (§ 70(1)) to be "held and applied" for, among other things, "payment of claims of subcontractors, architects, engineers, surveyors, laborers and materialmen" (§ 71(2)(a)). The sooner those are assessed, the more options remain.

A lien was just filed against my property. What can I do?

Owners have fast tools: a written demand for an itemized statement of the claim, which the lienor must answer "within five days" (Lien Law § 38); discharge of the lien by "executing a bond or undertaking in an amount equal to one hundred ten percent of such lien" (§ 19(4)); an application for an order "summarily discharging of record the alleged lien" where the invalidity appears from the face of the notice (§ 19(6)); or a § 59 notice requiring the lienor "to commence an action to enforce the lien, within a time specified in the notice, not less than thirty days from the time of service, or show cause ... why the notice of lien filed ... should not be vacated and cancelled." Several of these are time-sensitive, so move promptly.