New York: Mechanic's Lien Deadlines & Notice Requirements

The short answer

New York skips the preliminary-notice step entirely: filing the notice of
lien is the first thing a claimant does, not the last step in a chain of
earlier warnings. That filing is due within 8 months of the lienor's own
completion or last day of work — 4 months if the job is on a single-family
dwelling. Once filed, the claimant must both serve a copy on the owner and
get proof of that service into the county clerk's file within 35 days, or
the filing stops counting as a lien at all. From there, a foreclosure suit
has to follow within a year, and single-family-dwelling liens get one extra
restriction: only a judge, not a simple filing, can push that year further
out.

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."

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,
these make a homeowner's project the tightest deadline profile in the
survey for this state.

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 — New York doesn't have a preliminary notice requirement. The notice of
lien filed after the fact is the whole notice obligation.

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?
The opposite — a single-family dwelling gets a shorter 4-month filing
deadline instead of 8 months, and its lien can only be extended by a court
order rather than a simple filed extension.

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 2026-07-04)
• N.Y. Lien Law § 10 (filing of notice of lien; deadline) —
  https://www.nysenate.gov/legislation/laws/LIE/10 (accessed 2026-07-04)
• N.Y. Lien Law § 11 (service of copy of notice of lien) —
  https://www.nysenate.gov/legislation/laws/LIE/11 (accessed 2026-07-04)
• N.Y. Lien Law § 17 (duration of lien) —
  https://www.nysenate.gov/legislation/laws/LIE/17 (accessed 2026-07-04)
• N.Y. Lien Law § 19(2) (discharge of lien for private improvement) —
  https://www.nysenate.gov/legislation/laws/LIE/19 (accessed 2026-07-04)
• N.Y. Lien Law § 70(1) (Article 3-A trust fund definition) —
  https://www.nysenate.gov/legislation/laws/LIE/70 (accessed 2026-07-04)