Mechanic's Liens in Pennsylvania (49 P.S. § 1101 et seq.)

Pennsylvania's Mechanic's Lien Law gives contractors, subcontractors, and suppliers a powerful tool: the right to place a lien directly on the property where they performed work or supplied materials, even if they have no contract with the property owner. The lien secures payment by encumbering the real estate itself, making it difficult for the owner to sell or refinance until the lien is resolved.

Who Can File a Mechanic's Lien?

• General contractors : Can file a lien for any unpaid work, provided they had a contract with the owner.
• Subcontractors : Can file a lien even though their contract is with the general contractor, not the owner. However, subcontractors must give the owner a formal written notice of intention to file a claim at least 30 days before filing the lien claim (49 P.S. § 1501(b.1)). This is the single most important requirement that subcontractors miss.
• Suppliers : Material suppliers who furnish materials to the project may have lien rights, but only if they provided materials that were actually incorporated into the improvement.

The Residential Property Exception

For residential properties, the Mechanic's Lien Law and related statutes provide important homeowner protections that do not apply to commercial projects:

• Defense of payment (§ 1301(b)). If an owner of an owner-occupied residential property pays the general contractor in full, subcontractors lose their lien rights against that property. This is an automatic protection that does not exist on commercial projects.
• Waiver of liens (§§ 1401, 1402). On residential property of three stories or less, a contractor or subcontractor may waive lien rights by written instrument (§ 1401). The owner and contractor can also agree by stipulation filed with the Prothonotary that no liens may be filed, which is binding on subcontractors with proper notice (§ 1402).
• Written contract requirement (73 P.S. § 517.7(a)). Separately, the Home Improvement Consumer Protection Act (HICPA) requires a written contract for all home improvement work exceeding $500. A contract that fails to comply with HICPA's requirements is void and unenforceable (§ 517.7(a)). However, the Pennsylvania Supreme Court has held that even without a HICPA-compliant written contract, a contractor may still pursue a mechanic's lien based on an implied contract and may recover under quantum meruit. Shafer Elec. & Const. v. Mantia , 96 A.3d 989 (Pa. 2014).

The practical takeaway for homeowners: these protections are significant but not absolute. If you are hiring a contractor for residential work, insist on a written contract, verify HICPA registration, and understand that paying your general contractor in full is your strongest defense against subcontractor liens.

Filing Deadlines: These Are Strict

Mechanic's lien claims must be filed within 6 months from the date the claimant last performed work or supplied materials to the project. This is a hard deadline; miss it by one day and the lien right is lost. The claim must be filed with the Prothonotary of the Court of Common Pleas in the county where the property is located.

After filing, the claimant must serve a copy of the claim on the property owner within one month of filing. The claimant must also commence an action to enforce the lien within 2 years of filing the claim, or the lien expires.

Defending Against a Mechanic's Lien

Property owners who receive a mechanic's lien have several options:

• Preliminary objections : Challenge the lien on procedural grounds: was the notice given? Was the claim timely? Is there a valid contract (express or implied) supporting the claim?
• Bond-off the lien: Post a bond with the court equal to 150% of the lien amount, which removes the lien from the property and transfers it to the bond. This allows a sale or refinance to proceed while the dispute is resolved.
• Negotiate a settlement: Many mechanic's lien disputes involve legitimate disagreements about scope of work, quality, or change orders. A negotiated resolution is often the most cost-effective outcome.
• Strike the lien: If the lien is procedurally defective, the owner can petition to strike it. Common defects include failure to give proper notice, late filing, insufficient description of work, or lack of any contractual basis (express or implied) for the claim.

Statutory content on this page was last verified against Pennsylvania statutes (68 Pa.C.S.; 21 P.S.): February 2026 . If you are reading this significantly after that date, confirm key provisions with current statute text or contact our office.