1. Start by Identifying the Project and Lien Type
Construction filing for a payment dispute is different from permit filing. A mechanic’s lien follows rules tied to the project, property, claimant, and timing of the work. Identifying the correct lien framework comes first.
Private and Single-Family Projects
- A private-improvement lien may be filed during the work or within the statutory eight-month period afterward.
- A single-family dwelling generally uses a shorter four-month period.
- See the firm's construction and engineering law resource for broader project issues.
Public Improvements Use a Different Rule
- A public-improvement lien follows a separate filing process.
- Filing may occur before completion and acceptance or within 30 days afterward.
- The notice goes to the public officials identified by the statute.
2. Construction Lien Filing Deadlines Change with the Project
The filing window depends on the project category and the event that starts the clock. Lien Law § 10 governs private improvements, while § 12 applies to public improvements. Project records should be used to calculate the date.
Compare the Main Filing Windows
| Project Type | General Filing Window |
|---|---|
| Private improvement | During the work or within eight months after the applicable completion, final work, or final furnishing date. |
| Single-family dwelling | During the work or within four months after the applicable completion, final work, or final furnishing date. |
| Public improvement | Before completion and acceptance or within 30 days afterward. |
Private improvement
- General Filing WindowDuring the work or within eight months after the applicable completion, final work, or final furnishing date.
Single-family dwelling
- General Filing WindowDuring the work or within four months after the applicable completion, final work, or final furnishing date.
Public improvement
- General Filing WindowBefore completion and acceptance or within 30 days afterward.
Check the Trigger Date Carefully
- Review final work, material delivery, and contract-completion records.
- Confirm whether the property falls within the single-family rule.
- A retainage lien may be filed within 90 days after the retainage was due to be released.
3. Private Liens Must Be Filed in the Proper County
For a private improvement, § 10 requires filing with the county clerk where the property is situated. If the property spans more than one county, filing is required in each applicable county. Public-improvement liens use a different route.
Check the Property before Filing
- Confirm the property location and correct county clerk.
- Review the owner information and property description in the notice.
- See the firm's construction resource for broader project matters.
Public Filing Goes to Different Officials
- Section 12 requires filing with the department or bureau in charge of the work.
- The notice must also be filed with the appropriate financial official identified by the statute.
- Do not substitute private-property filing steps for this process.
4. Service Requirements Continue after Filing
Filing a private lien does not complete the process. Under § 11, the lienor must serve the owner within five days before or 30 days after filing. Proof of service must be filed within 35 days after the lien is filed.
Owner Service Has Its Own Deadline
- Serve the owner within the statutory window using an authorized method.
- Keep records showing when and how service occurred.
- Failure to file proof of service within 35 days terminates the notice as a lien.
Other Project Parties May Need Service
- Section 11-b may require certified-mail service on a contractor or subcontractor.
- The proper recipient depends on the lienor's contractual relationship.
- Proof of required service must also be filed within 35 days.
Public Improvement Service Is Different
- Section 11-c requires certain public-improvement lienors to serve specified project parties before or when filing.
- Proof of service must appear on or be filed with the notice.
- Failure to file that proof renders the notice of lien a nullity.
5. A Missed Deadline Can Affect the Lien
Late filing, defective service, or filing in the wrong place can put lien rights at risk. Not every error can be cured by amendment. The response depends on the missed requirement.
Identify the Problem First
- Check whether the defect concerns timing, location, notice content, or service.
- Review whether the statute permits amendment or another corrective step.
- Do not assume a later filing restores an expired lien right.
A Payment Dispute May Continue Separately
- Owners and lienors may dispute the validity, amount, or enforcement of the lien.
- Contract or payment claims may remain even when lien rights are contested.
- See the firm's civil litigation resource for related court disputes.
6. A Filed Lien Has Its Own Enforcement Calendar
Section 17 generally limits a private-improvement lien to one year after filing unless it is properly continued or enforced. A timely foreclosure action and notice of pendency can continue the lien. Single-family dwelling liens have a stricter extension rule.
Track the One-Year Period
- Record the date the notice of lien was filed.
- Review foreclosure and notice-of-pendency requirements before expiration.
- Do not treat the initial filing as permanent protection.
Single-Family Extensions Are Different
- A single-family dwelling lien cannot use the ordinary extension filing.
- Section 17 requires a court order to extend that lien.
- Review the enforcement calendar before the lien expires.
7. Frequently Asked Questions
Can a mechanic’s lien be filed before the work is finished?
For a private improvement, filing may occur while work or material furnishing is still in progress. The applicable lien and project should still be confirmed first.
Is there a different deadline for retainage?
Yes. Section 10 allows a retainage lien to be filed within 90 days after the retainage was due to be released.
Does filing a lien automatically start foreclosure?
No. Filing the lien and enforcing it through foreclosure are separate steps.
Can an owner challenge a mechanic’s lien?
Yes. Depending on the issue, the lien may be challenged, discharged, or contested in enforcement proceedings.
8. Review a Construction Filing Deadline with SJKP
A construction lien can turn on several dates, filing locations, and service requirements. SJKP's attorneys can review the project type, work and material dates, proposed notice, service obligations, and enforcement timeline for contractors, subcontractors, suppliers, and property owners. Contact SJKP to discuss the filing requirements that may apply.
03 Feb, 2026
