Pennsylvania Mechanics Lien Deadlines for Residential Work

In Pennsylvania, a contractor or subcontractor owed more than $500 has to file a mechanics lien claim within six months after finishing its work and serve notice of the filing on the owner within one month, under the Mechanics’ Lien Law of 1963. Subcontractors must also give the owner written notice at least 30 days before filing, and on most owner-occupied homes a subcontractor can’t file a lien at all once the owner has paid the contractor in full.

Who can file a mechanics lien in Pennsylvania?

A lien secures payment for labor or materials used to build, alter or repair an improvement, and the claim has to be more than $500 (49 P.S. § 1301(a)). The law recognizes two kinds of claimants (§ 1201):

• Contractors: anyone who contracts with the owner, expressly or impliedly, to build, alter or repair.
• Subcontractors: anyone who does work or supplies or hauls materials, fixtures or equipment that are reasonably necessary for and actually used in the job, under a contract with the contractor or with a subcontractor that contracts directly with the contractor.

That puts a limit on how far down the chain lien rights go. A sub’s sub can file, but anyone who contracts with that second-tier sub can’t, and neither can a supplier who sells to another supplier.

Pennsylvania mechanics lien deadlines

Step	Deadline	Who	Law
Formal notice of intent to file	At least 30 days before filing	Subcontractors and suppliers	§ 1501(b.1)
File the claim with the prothonotary	Within 6 months after completing your work	All claimants	§ 1502(a)(1)
Serve notice of the filing on the owner	Within 1 month after filing	All claimants	§ 1502(a)(2)
File an affidavit of service	Within 20 days after service	All claimants	§ 1502(a)(2)
Start the lawsuit to enforce the lien	Within 2 years after filing (the owner can extend in writing)	All claimants	§ 1701(b)
Get a verdict or judgment	Within 5 years after filing	All claimants	§ 1701(d)

“Completion of the work” means the day you performed the last labor or delivered the last materials your contract called for, whichever came later (§ 1201). The six months runs from the end of your own work, not the end of the whole project. Missing the service deadline or the affidavit deadline is enough to have the claim struck (§ 1502). Service is made by an adult the same way as a writ of summons, or, if that isn’t possible, by posting the notice on a conspicuous public part of the property.

The working tip: keep delivery tickets, daily logs and dated photos that prove your last day of contract work, and put two dates on the calendar the day you finish. For a subcontractor, the 30-day notice has to go out no later than about five months after completion to leave room to file inside six.

Notice rules for subcontractors and suppliers

A subcontractor’s claim is invalid unless it gave the owner formal written notice of intent to file at least 30 days before filing (§ 1501). The notice has to state the claimant’s name, who it contracted with, the amount claimed, the general nature of the labor or materials, the date the work was completed and a description that identifies the property. It can go by first class, registered or certified mail to the owner or the owner’s agent, be served by an adult like a writ of summons, or, failing both, be posted on a conspicuous public part of the improvement.

Pennsylvania used to require a preliminary notice from subs on alteration and repair work. That requirement was deleted effective January 1, 2007, so a typical home job has no preliminary notice. Projects of $1.5 million or more that are registered as searchable projects in the state’s Construction Notices Directory have their own notices: if a notice of commencement was filed, subs file a notice of furnishing within 45 days after they start.

The rule to file

An owner or contractor doesn’t have to wait six months to find out whether a sub will file. Any time after a subcontractor finishes its work, either one can file a rule in court requiring the sub to file its claim; if the sub doesn’t file within 30 days after notice of the rule, its lien right is gone for good (§ 1506).

When a subcontractor can’t lien your house

Pennsylvania gives homeowners a strong shield against paying twice. A subcontractor has no lien right against residential property when all three of these are true (§ 1301(b)):

1. the owner (or tenant) has paid the full contract price to the contractor;
2. the property is, or will be, the owner’s residence, or is later occupied by the owner’s tenant; and
3. it’s a single townhouse or a building with one or two dwelling units.

A townhouse here means one unit in a group of three or more attached units, running from foundation to roof, with open space or a public way on at least two sides. Two cautions: the shield protects against subs and suppliers, not the contractor you hired if you still owe it, and it only works once the full contract price is paid. If you’re holding back money over a dispute, subs keep their lien rights.

How homeowners avoid paying twice

• Keep proof of payment. Cancelled checks or bank records showing you paid the full contract price are what the § 1301(b) shield turns on.
• Know who’s on the job. Pennsylvania’s home improvement law requires your contract to list the subcontractors known when you sign. See our contract and deposit rules.
• Collect lien waivers. Get a written, signed waiver from the contractor with final payment, and from major subs and suppliers as they’re paid. On residential property, a waiver is valid if it’s in writing and signed (§ 1401(a)).
• Don’t rely on the contractor’s waiver alone. A waiver in your contract binds a sub only with proof the sub had actual notice of it before supplying anything, or that the contract was filed with the prothonotary within the deadlines in § 1402.
• Use joint checks on big deliveries. A check payable to both the contractor and the supplier makes sure the supplier is paid.

Commercial work is different. On nonresidential jobs, a lien waiver is void unless it’s given for payment actually received, and only up to that amount; a sub’s waiver can also stand if the contractor posted a payment bond (§ 1401(b)). So an up-front lien waiver in a home improvement contract can be valid, while the same clause in a commercial contract generally isn’t.

Common mechanics lien mistakes

• Counting six months from the project’s end or an invoice date instead of your own last day of contract labor or delivery.
• Serving the owner more than a month after filing, or never filing the affidavit of service.
• A subcontractor filing without the 30-day formal notice.
• Filing a claim for $500 or less.
• A sub filing against a paid-up, owner-occupied one- or two-unit home.
• Letting a filed lien sit past the two-year deadline to sue.

Sources

• Mechanics’ Lien Law of 1963, Act 497 of 1963, 49 P.S. §§ 1101-1902 (official)
• 49 P.S. §§ 1201, 1301, 1401, 1402, 1501, 1502, 1506, 1701 (FindLaw)
• Pennsylvania Department of General Services, file a construction notice of furnishing

Last checked November 14, 2026.

Common questions

How long do you have to file a mechanics lien in Pennsylvania?

Six months after you finish your work, meaning your last labor or last delivery of materials under your contract. You then have one month after filing to serve notice on the owner and 20 days after service to file an affidavit of service. Subcontractors must give the owner written notice at least 30 days before filing.

Can a subcontractor put a lien on my house if I paid the contractor?

Not if you paid the full contract price, the home is or will be your residence, and it’s a single townhouse or a building with one or two dwelling units. In that case Pennsylvania law gives the subcontractor no lien right.

Do I need to send a preliminary notice in Pennsylvania?

Not on a typical home job. Pennsylvania deleted its preliminary notice for alterations and repairs effective January 1, 2007. Subcontractors still must send a formal notice of intent to file at least 30 days before filing, and projects of $1.5 million or more have separate notice rules.

How long does a mechanics lien last in Pennsylvania?

The claimant must start a lawsuit to enforce it within two years of filing, unless the owner agrees in writing to extend that, and must get a verdict or judgment within five years. Otherwise the lien is lost.

This is a plain-English summary, not legal advice.

See every Pennsylvania building, digging and contractor rule on our Pennsylvania guide. Related: Pennsylvania contractor deposit limits · Pennsylvania contractor registration.