Mechanic's Lien Deadlines & Notice Requirements in New York

At a glance

Requirements one by one

Governing law

New York's mechanic's lien law is Lien Law Article 2 (§§ 3-24). Running alongside it — and often more consequential in practice — is Article 3-A (§§ 70-79), which makes money an owner, contractor, or subcontractor receives for a project a statutory trust for the benefit of the subs, suppliers, and laborers who worked on it. Article 3-A's trust-fund protection is a distinct legal remedy from the lien itself; this survey focuses on the lien's deadlines, but the trust exists as extra leverage on top of it.

Who can claim

Section 3 gives lien rights broadly: "a contractor, subcontractor, laborer, materialman, landscape gardener, nurseryman or person or corporation selling fruit or ornamental trees, roses, shrubbery, vines and small fruits, who performs labor or furnishes materials for the improvement of real property with the consent or at the request of the owner," plus certain benefit trust funds for laborers. Direct privity with the owner isn't required — a subcontractor with no contract with the owner can still lien, as long as the owner consented to or requested the underlying work.

Preliminary notice

There isn't one. New York doesn't require any notice before a claimant files — the notice of lien under § 10 is the claimant's first formal step, in contrast to states that require a separate pre-lien or preliminary notice sent at the start of the job.

Deadline to file the lien

Section 10 sets the deadline at "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." That drops to four months "where the improvement is related to real property improved or to be improved with a single family dwelling." The lien can also be filed earlier, "at any time during the progress of the work." For retainage, § 10 separately allows filing within 90 days after the date the retainage was due to be released. Its single-family definition excludes a developer-owned unit in a filed subdivision when the developer does not own it as a personal residence.

Notice of completion effect

New York has nothing resembling an owner-filed notice that shortens the window. The clock in § 10 runs entirely off the lienor's own last day of work or the contract's completion — there's no equivalent to a recorded notice of completion or cessation that an owner can use to cut the deadline short.

Serving the lien on the owner

After filing, § 11 requires the claimant to serve a copy on the owner "within five days before or thirty days after filing the notice of lien." That alone isn't enough: "Failure 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." Skipping the paperwork trail after service is just as fatal as skipping service itself.

Deadline to sue to foreclose

Section 17 caps a lien at "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 pendency of that action is filed. Most liens can also be kept alive by filing a written extension within that first year, but that particular escape hatch is unavailable for a single-family dwelling — see below.

Homestead/residential extras

A single-family dwelling gets two distinct breaks from the general rule, both making the lien harder to keep alive, not easier. First, the filing deadline itself is shorter: four months instead of eight (§ 10). Second, once filed, that lien "may only be extended by an order of a court of record, or a judge or justice thereof" — the simple written-extension filing that works for other property isn't available (§ 17). Together, the ordinary single-family timetable is therefore shorter and the extension method is different from other property. Section 10's subdivision exception can make the eight-month rule apply to a developer-owned unit.

What trips people up

Because New York has no preliminary notice, claimants sometimes assume there's nothing to track until the job is nearly done — but the 8-month (or 4-month) clock starts running from the lienor's own last day of work, not from any project-wide completion date, so a sub who finishes early has a correspondingly earlier deadline. Separately, filing the notice of lien itself is only half the job: serving it on the owner and then filing proof of that service with the county clerk within 35 days are two more, easy-to-miss steps that can undo an otherwise timely lien.

Common questions

Do I need to send any notice before I start work to preserve my lien rights? No separate pre-filing notice is required. The filed notice of lien still must be served on the owner and proof of service filed under § 11.

What happens if I file the lien on time but forget to serve it on the owner? Section 11 makes the consequence explicit: failing to get proof of service to the county clerk within 35 days of filing "shall terminate the notice as a lien" — the same hard result as never filing at all.

Is a homeowner's project treated more leniently because it's smaller? Ordinarily, the filing limit is four months instead of eight, and an extension needs a court order. Section 10 excludes qualifying developer-owned subdivision units from its single-family definition.

Pending bills

A10348 would lengthen the § 10 ordinary filing periods to 18 and 12 months. A10682-A would change § 17 for liens discharged by deposit, undertaking or order. The official Assembly histories show neither change enacted as of October 6, 2026; the current statutory periods above still govern.

Statutes and sources

• N.Y. Lien Law § 3 (mechanic's lien on real property; who can claim) — https://www.nysenate.gov/legislation/laws/LIE/3 (accessed 2026-10-06)
• N.Y. Lien Law § 10 (filing of notice of lien; deadline) — https://www.nysenate.gov/legislation/laws/LIE/10 (accessed 2026-10-06)
• N.Y. Lien Law § 11 (service of copy of notice of lien) — https://www.nysenate.gov/legislation/laws/LIE/11 (accessed 2026-10-06)
• N.Y. Lien Law § 17 (duration of lien) — https://www.nysenate.gov/legislation/laws/LIE/17 (accessed 2026-10-06)
• N.Y. Lien Law § 19(2) (discharge of lien for private improvement) — https://www.nysenate.gov/legislation/laws/LIE/19 (accessed 2026-10-06)

• N.Y. Lien Law § 70(1) (Article 3-A trust fund definition) — https://www.nysenate.gov/legislation/laws/LIE/70 (accessed 2026-10-06)

• N.Y. Lien Law § 10 (developer-owned subdivision exception) — https://www.nysenate.gov/legislation/laws/LIE/10 (accessed 2026-10-06)