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New York Lien Law Deadlines for Suppliers and Subcontractors
On a private New York project, the ordinary supplier filing period is 8 months after last furnishing, or 4 months for a qualifying single-family dwelling. The developer-subdivision exception and retainage rules can change that result. Owner service and any additional service required by your contracting role must be completed, with proof filed on time. New York has no separate preliminary notice on private projects.
Public date calculations cover Florida and Kansas. New York dates require qualified review.
Risk context
New York is High Risk When "Last Furnishing" is Mis-Traced
In New York, suppliers commonly lose lien rights because the last furnishing date is documented inconsistently (multiple deliveries, backorders, returns, pickup vs delivery, change orders). The lien deadline is measured in months, but the clock still starts from the last furnishing date that legally counts. Waiting also costs money: a lien for materials sold to a contractor or subcontractor reaches only what is earned and unpaid on the contract when you file, plus amounts earned later. And a lien filed on time still terminates if proof of service is not filed with the county clerk within 35 days.
Deadline schedule
New York Mechanics Lien Deadlines (Updated 2026)
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| Deadline Type | Timing | Details |
|---|---|---|
| Preliminary Notice | None required on private projects | New York's Lien Law has no notice step before the lien on a private improvement. Your first required filing is the verified notice of lien, which must state the dates of your first and last work or deliveries and whether the property is a single-family dwelling (Lien Law § 9). |
| Lien Filing (Material Suppliers) | 8 months from last furnishing services/materials | For many private projects, a supplier must file within 8 months of the last furnishing date. This is measured from the last date that legally qualifies as furnishing, not the last invoice date. File the notice of lien in the county clerk's office for the county where the property is located (Lien Law § 10). |
| Single-Family Homes | 4 months from last furnishing | When the property is improved or to be improved with a single-family dwelling, the filing window is 4 months. A house in a filed subdivision that the developer still owns for purposes other than its own residence does not count (Lien Law § 10). A general residential label is insufficient: mixed-use, condominium and disputed subdivision classifications need review. |
| Retainage Timing | Within 90 days after retainage payment is due | If the claim involves retainage, timing can be tied to when retainage becomes due. If you supply on projects with structured retainage, confirm the retainage due date and calendar the 90-day window. Lien Law § 10 lets a notice of lien for retainage be filed within 90 days after the date the retainage was due to be released. |
| Service / Delivery of Lien | Within 5 days before or 30 days after filing | Serve the owner as required by Lien Law § 11. Section 11-b additionally requires certified-mail service on the specified contractor or subcontractor customer, with service on the contractor for a qualifying lower-tier relationship. A direct-owner material supplier must resolve its statutory role before assuming that the same additional customer-service rule applies; owner service remains required. |
| Proof of Service | Within 35 days after filing | File proof of each service with the county clerk within 35 days after the notice of lien is filed. If you do not, the notice terminates as a lien (Lien Law §§ 11, 11-b). |
| Enforcement / Foreclosure | 1 year after filing the notice of lien | After filing, you generally have 1 year to start an action to enforce the lien. Filing is not the end: it is the start of an enforcement timeline. Within that year, start the foreclosure action and file a notice of pendency with the county clerk, or file an extension, which continues the lien for up to 1 year from the date the extension is filed. A lien on a single-family home can be extended only by court order (Lien Law § 17). |
| Owner's Demand to Sue | At least 30 days after the owner's notice | The owner can serve a notice requiring you to start the foreclosure action within the time it states, at least 30 days, or show cause in court why the lien should not be vacated (Lien Law § 59). |
| Public Improvements | Within 30 days after completion and acceptance | On a state or public-corporation project, the lien is on the public funds for the job, not the land. File with the agency in charge and with the state comptroller or the public owner's financial officer. Within 5 days before, or at the same time as, the filing, mail a copy by certified mail to your customer, and to the prime contractor if your customer is a subcontractor, and file proof of that service with the notice, or the notice is a nullity. The lien lasts 1 year unless you start the foreclosure action and file the notice of pendency, or an extension, with that same comptroller or financial officer (Lien Law §§ 5, 11-c, 12, 18). |
| Statutes | NY Lien Law | NY Lien Law § 3 et seq.; § 9; § 10; § 11; § 17; § 18. Also §§ 4, 5, 8, 11-b, 11-c, 12, 38, 39, 39-a, and 59. |
Supplier pitfalls
Common Supplier Mistakes in New York
Using the Last Invoice Date Instead of the Last Furnishing Date
Invoices are accounting artifacts. Lien timing is driven by furnishing. If deliveries continued after the last invoice, or invoices continued after the last delivery, the wrong date can put you outside the filing window.
Assuming "8 Months" Means There's No Urgency
A lien for materials sold to a contractor or subcontractor reaches only what is earned and unpaid on the contract when you file, plus amounts earned later (Lien Law § 4). Every payment the owner makes while you wait can shrink what the lien can collect, and on a single-family home you have only 4 months. You can demand in writing that the owner state the contract terms and the amount due or to become due (Lien Law § 8).
Serving the Lien Without Filing Proof of Service
Service alone is not enough. File proof of owner service and every additional service required by your statutory role with the county clerk within 35 days after filing, or the notice terminates as a lien (Lien Law §§ 11, 11-b). Identify the contract chain rather than treating every supplier as having the same recipients.
Overstating the Lien Amount
If a court finds the amount wilfully exaggerated, the lien is void, you cannot file another lien for the same claim, and you can owe the owner or contractor damages, including their attorney's fees for discharging it (Lien Law §§ 39, 39-a). The owner or contractor can also demand a verified itemized statement, due within 5 days (Lien Law § 38).
Deadline calculator
Not Sure Which New York Deadline Applies?
Use this New York guide and collect your project facts for qualified review.
Review New York project factsThe public calculator provides dates only for reviewed Florida and Kansas scenarios; it does not calculate a New York date.
Common questions
Frequently Asked Questions
What are the New York lien law deadlines?
On an ordinary private claim, the filing period is eight months after last furnishing, or four months for a qualifying single-family dwelling, subject to the developer and retainage provisions. Serve the owner and any additional recipients required by your role within the applicable five-days-before/30-days-after window, and file proof within 35 days. The general enforcement or extension period is one year after filing.
When is the New York lien filing deadline for suppliers?
Ordinarily eight months after last qualifying furnishing, or four months for the single-family dwelling category, including the developer exception described above (Lien Law § 10). You can also file during the work. Use actual furnishing records; undelivered materials or an uncertain last qualifying delivery need review rather than an assumed invoice-based date.
Does New York require a preliminary notice for suppliers?
No. New York has no preliminary notice on private projects; the first required step is the verified notice of lien. Filing early still helps, because a lien for materials sold to a contractor or subcontractor reaches only what is earned and unpaid on the contract when you file, plus amounts earned later (Lien Law § 4). See our preliminary notice deadline guide for how other states differ.
Who needs to be served?
The owner must be served under §11. Section 11-b adds recipients according to the lienor's statutory role and contract chain, including the contractor for qualifying lower-tier claims. If you supplied the owner directly, confirm whether any separate §11-b obligation applies rather than assuming the downstream-supplier rule. File proof of all required service within 35 days after filing.
How does retainage affect timing?
A notice of lien for retainage can be filed within 90 days after the date the retainage was due to be released (Lien Law § 10). Establish that due date from the applicable contract and release conditions. A missing or disputed date requires review; final delivery is not a substitute.
When do I have to enforce the lien?
Within 1 year after filing, start the foreclosure action and file a notice of pendency with the county clerk, or file an extension, which continues the lien for up to 1 year from the date it is filed. On a single-family home, only a court order can extend the lien (Lien Law § 17). If the owner serves a demand, you may have as little as 30 days to sue (Lien Law § 59). See how long a mechanics lien lasts for how expiration works.
Does every residential project have a four-month filing period?
No. Section 10 uses the single-family dwelling classification, with a specific developer-owned filed-subdivision exception. Confirm the actual property and ownership facts, especially for a condominium or mixed-use improvement, before choosing four or eight months.
Important note