Updated September 7, 2026. Filing a New York mechanic's lien requires more than completing a form. Identify the correct property or public contract, calculate the deadline, serve the required parties and file proof of service.
Step 1: Identify the project and your lien rights
Private liens attach to a qualifying interest in real property. Public-improvement liens generally attach to contract funds. Confirm the owner, the party that hired you, your position in the contract chain and any applicable licensing requirement. A project on publicly owned land can require special analysis even if the work was privately commissioned.
Step 2: Calculate the filing deadline
Lien Law § 10 generally allows a private lien during the work or within eight months after the last qualifying work or materials. For a single-family dwelling the usual period is four months. The statute excludes certain developer-owned subdivision properties from that single-family rule; ownership by a corporation alone does not answer the question. Calendar months are not interchangeable with a fixed number of days.
A notice for retainage has a separate 90-day filing provision measured from the date the retainage was due to be released. Do not use that provision as a blanket extension for other unpaid amounts.
For a public improvement, § 12 generally permits filing before completion and acceptance and within 30 days afterward. Confirm both events and the relevant agency records. Do not wait for the deadline to investigate.
Step 3: Verify the parties, property and amount
Check the deed and property description using the appropriate land records or a title search. Condominiums, cooperative buildings, tenant work and multi-parcel developments require particular care. Reconcile the contract, changes, invoices, payments and credits. Separate amounts that may support a lien from other claimed damages.
Step 4: Prepare and verify the notice
§ 9 specifies the contents of a private notice, including information about the lienor and attorney, owner and interest, hiring party, work and materials, amount unpaid, work dates and property. The notice must be verified. Foreign corporations and partnerships should obtain advice about the information required for their particular circumstances.
Step 5: File in the proper office and complete service
A private notice is filed with the county clerk where the property is located; property in more than one county requires attention to each county. Check the clerk's current filing procedure and fee.
Under § 11, serve the owner using an authorized method within five days before or 30 days after filing. § 11-b adds certified-mail service requirements for the relevant contracting parties and, in specified lower-tier situations, the general contractor. File proof of required service within 35 days after the lien filing. Filing the notice alone does not complete the process.
A public lien uses the designated department and financial officers under § 12, with additional service requirements under § 11-c. Do not use the private-property filing procedure for a public-improvement claim.
Step 6: Calendar continuation and enforcement
The initial lien period is generally one year. § 17 governs private-lien continuation and § 18 governs public liens. Single-family extensions require a court order. Foreclosure may require a notice of pendency as well as commencing suit; the procedure differs after a discharge bond or deposit. Start this review well before expiration.
A filed lien secures a potential remedy; it does not automatically collect the debt. Kushnick Pallaci PLLC assists with New York mechanic's liens and lien foreclosure and defense. Call (631) 752-7100 for help evaluating a particular claim.
General information only. Confirm the facts and applicable deadlines before taking action.
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