New York Lien Law: Mechanic's Liens on Real Property — Filing Deadlines, Foreclosure, and Discharge

A mechanic's lien is a statutory security interest that attaches to real property when someone who improved that property has not been paid. In New York, the entire system is governed by the Lien Law. In plain terms: if a contractor, subcontractor, laborer, or material supplier furnishes labor or materials for the improvement of privately owned real property with the consent of the owner, Lien Law § 3 gives that party the right to file a lien against the property itself — not just a claim against the person who hired them. The lien converts an unpaid invoice into an encumbrance on title, which is why it is one of the most powerful collection tools in New York construction practice, and one of the most disruptive events for a property owner trying to refinance or sell.

Who May File and What the Lien Secures

Lien Law § 3 extends lien rights to contractors, subcontractors, laborers, and materialmen (suppliers), among others, who perform labor or furnish materials "for the improvement of real property with the consent or at the request of the owner." Two practical points follow from the statute's text:

• Consent of the owner is required. A tenant's renovation, for example, supports a lien against the fee only if the fee owner consented to or affirmatively required the improvement — mere knowledge or acquiescence is generally not enough.
• The lien is limited by the "lien fund." Under Lien Law § 4, the lien attaches only to the extent of the amount the owner still owes the general contractor at the time of filing (plus amounts that later become due). A subcontractor who files after the owner has fully paid the general contractor may hold a lien secured by nothing.

Filing Deadlines Under Lien Law § 10

The deadlines are strict and jurisdictional — a late lien is void, and courts cannot extend the time to file. Lien Law § 10 sets two different periods for private improvements:

• Single-family dwellings: the notice of lien must be filed within four months after the last item of work was performed or materials were furnished.
• All other real property (commercial buildings, multi-family properties, condominiums, etc.): the notice of lien must be filed within eight months after the final furnishing of labor or materials.

The clock runs from the last date of actual, contract-related work — not from punch-list visits, warranty repairs, or token returns to the site staged to revive an expired deadline. The notice is filed with the county clerk of the county where the property is located.

Worked Example

A plumbing subcontractor last furnishes labor on a Brooklyn mixed-use building on March 10. The eight-month period of Lien Law § 10 runs to November 10. If the sub returns on July 1 solely to fix a leaking joint under warranty, that visit does not restart the clock. If the same work had been performed on a single-family house, the deadline would have been July 10 — four months from March 10.

Contents and Service of the Notice of Lien (§§ 9, 11, 11-b)

Lien Law § 9 prescribes the required contents of the notice of lien, including the lienor's name and address, the name of the owner, the person by whom the lienor was employed, the labor performed or materials furnished, the agreed price or value, the amount unpaid, the dates of first and last work, and a description of the property sufficient for identification. Section 9 must be substantially complied with; material misstatements can render the lien subject to summary discharge.

Filing alone is not enough. Under Lien Law § 11, the lienor must serve a copy of the notice on the owner within five days before or thirty days after filing, and proof of service must be filed with the county clerk within thirty-five days after filing. Failure to serve and file proof of service terminates the lien. Lien Law § 11-b imposes a parallel obligation on subcontractors and suppliers to serve the general contractor.

Duration of the Lien and Extensions (§ 17)

A mechanic's lien on private property lasts one year from the date of filing (Lien Law § 17). Before the year expires, the lienor must either:

1. Commence a foreclosure action and file a notice of pendency; or
2. Extend the lien. For commercial and multi-family property, one extension of one year may be obtained by filing an extension with the county clerk before expiration; any further extension requires a court order. For a lien on a single-family dwelling, no extension by mere filing is allowed — every extension requires a court order.

If the lien is neither foreclosed nor properly extended within the year, it lapses automatically by operation of law.

Foreclosing a Mechanic's Lien

A mechanic's lien is enforced by a foreclosure action under Article 3 of the Lien Law (§ 41 et seq.), which proceeds much like a mortgage foreclosure: necessary parties (the owner, other lienors, mortgagees, and encumbrancers) must be joined, and a judgment of foreclosure directs the sale of the property with the proceeds distributed according to priority. Two procedural points deserve emphasis:

• A notice of pendency is essential. Filing a notice of pendency against the property both preserves the lien beyond its one-year life while the action is pending and binds subsequent purchasers and encumbrancers to the outcome. Our page on notices of pendency in real property litigation explains the mechanics and risks in detail.
• Priority matters. Mechanic's liens generally take priority among themselves under Lien Law § 13 rules, and their standing against mortgages and other consensual security depends on recording sequence and building loan compliance. Where the dispute also involves contractual security interests, see our discussion of enforcing a security agreement against real property.

Discharging a Mechanic's Lien (§ 19)

Owners are not without remedies. Lien Law § 19 provides several routes to remove a lien from title:

• Expiration: if the lien has lapsed under § 17, the owner may obtain an order discharging it of record.
• Payment or satisfaction: the lienor files a satisfaction upon payment.
• Bonding off (§ 19(4)): the owner or contractor may substitute a surety bond for 110% of the lien amount. The lien then attaches to the bond instead of the property, freeing title for a sale or refinance while the dispute is litigated. This is the standard mechanism when a lien surfaces on the eve of a closing — a scenario our real estate closing attorneys encounter regularly in title searches.
• Summary discharge (§ 19(6)): if the lien is invalid on its face — filed late, missing a § 9 requirement, or filed by a party with no lien rights — the owner may move for summary discharge. Critically, courts will not summarily discharge a lien based on disputed facts (for example, a claim that the work was defective); those disputes must await the foreclosure trial.

Willful Exaggeration (§§ 39, 39-a)

A lienor who deliberately inflates the lien amount faces severe consequences. Lien Law § 39 voids a willfully exaggerated lien in its entirety — including any legitimate portion — and § 39-a exposes the lienor to damages, including the owner's attorneys' fees and the amount of the exaggeration. Lien amounts should be documented, conservative, and tied to the contract and change orders.

Common Pitfalls

• Miscalculating the four- versus eight-month deadline based on property type.
• Filing the notice but failing to serve it under § 11 and file proof of service within thirty-five days.
• Letting the one-year duration lapse without an extension or foreclosure action and notice of pendency.
• Attempting to extend a single-family dwelling lien by filing rather than court order.
• Filing a subcontractor lien after the owner has exhausted the lien fund under § 4.
• Inflating the lien amount and triggering §§ 39 and 39-a exposure.

You can contact the Law Offices of Albert Goodwin by phone at 212-233-1233 or by email at [email protected].