To fight a mechanics lien in Pennsylvania, start by attacking the claimant’s compliance with the Mechanics’ Lien Law of 1963. Even a legitimate underlying debt can’t support a lien that missed a filing deadline, skipped a required notice, or inflated the amount owed. If the lien survives that review, you have further options: residential owners who’ve already paid their general contractor get a near-automatic discharge, any owner can clear title by posting a bond, and the claimant can be forced to either sue within two years or lose the lien entirely.
Check the Lien for Procedural Defects First
Pennsylvania’s lien law is unforgiving about deadlines and notice content. One missed step is enough to get the claim stricken, which is faster and cheaper than litigating whether money is owed.
Get a complete copy of the lien claim from the Prothonotary’s office in the county where the property sits. The document shows the claimant’s name, the amount demanded, the basis for the claim, and the filing date. Work through the following in order.
The Six-Month Filing Deadline
Every claimant must file with the Prothonotary within six months after completing their work on the property. A filing even one day late is defective. The claimant must also serve you with written notice of the filing within one month, then file proof of that service within 20 days. Failure on either step is independent grounds for striking the claim.1Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 502
The 30-Day Subcontractor Notice
A subcontractor you didn’t hire directly must deliver you a formal written notice of intent to file at least 30 days before filing the claim. That notice has to state the subcontractor’s name, who they contracted with, the amount claimed, a description of the work or materials, the completion date, and enough detail to identify the property.2Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 501 Skipping this step or botching the required content invalidates the lien. This is one of the most common defects owners find.
Searchable Project Failures
For construction projects costing $1.5 million or more, the state runs an online directory. When the owner files a Notice of Commencement, subcontractors and suppliers must file a Notice of Furnishing within 45 days of first performing work on the site, or they forfeit lien rights.3Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 201 and Section 501.3 If you own a commercial property with a large project, filing the Notice of Commencement is a powerful defensive move. It shifts the burden to every sub and supplier to register or lose the right to lien.
Inflated or Improper Amounts
A mechanics lien can only cover labor and materials actually incorporated into the improvement. Charges for breach of contract damages, lost profits, or work on a different project don’t belong, and tacking them on makes the claim defective. Anyone who abuses the searchable-project directory by filing notices to extract more than is due faces liability for actual damages or $2,000, whichever is greater.4Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 501.6
If you spot an obvious defect, consider sending the claimant or their attorney a letter identifying the problem and requesting a voluntary withdrawal. Many claimants will release a lien they know can’t survive a court challenge rather than pay to defend it. If they don’t respond promptly, move to the formal filings below.
The Residential Homeowner Shield
If you own a single townhouse or a building with one or two dwelling units used for living purposes, Pennsylvania gives you a defense most homeowners don’t realize they have.5Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 301
If you hired a general contractor and paid the full contract price, a subcontractor has no lien rights against your home at all. The court will discharge the lien on a simple petition or motion. If you’ve paid part of the contract price but not all of it, the lien gets reduced to whatever balance you still owe the general contractor.6Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 510 Either way, you’re not on the hook for more than what remains unpaid to your contractor.
Keep meticulous records of every payment to your general contractor: canceled checks, wire transfer confirmations, signed receipts. Those records are what trigger this protection. A subcontractor who filed because the GC didn’t pay them has a dispute with the GC, not with your home.
Filing Preliminary Objections
When informal efforts fail, preliminary objections are your first formal move. The filing asks the court to strike the lien based on defects visible in the claim itself, without reaching whether money is actually owed.7Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 505
Grounds include the property being exempt from liens or the claim failing to conform with any requirement of the lien law. A missed filing deadline, a subcontractor’s failure to send the 30-day advance notice, missing required content in the claim, or failure to serve notice of filing properly are all strong bases. If the defect is clear on the record, the judge can order the lien stricken. If the objections raise a factual dispute, the court can take evidence through depositions or other means before ruling.7Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 505
One useful nuance: choosing not to file preliminary objections doesn’t waive your right to raise the same defense later during litigation. If you miss the window or decide to skip this step, the defect can still be argued at trial.
Clear Title Now by Posting a Bond or Cash
Sometimes the lien has to come off the title immediately because you’re selling, refinancing, or closing on a new loan. Pennsylvania lets you remove the lien without resolving the underlying payment dispute by depositing cash or posting a surety bond with the court.6Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 510
A cash deposit must equal the full amount of the lien claim. A surety bond defaults to double the lien claim, though the court can approve a lower figure as long as it’s not less than the full claim amount.6Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 510 Surety bond premiums typically run between 1% and 15% of the bond amount depending on your credit and financial profile, and the surety company often requires full collateral because these bonds carry real payout risk.
Once the court approves your petition and the money or bond is secured, the judge discharges the lien from the real estate. The claim then attaches to the deposited funds or bond rather than your property. You still have to resolve whether anything is owed, but your title is clear in the meantime, and any excess funds beyond what’s ultimately determined to be due get refunded.6Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 510
Force the Claimant to Sue or Lose the Lien
A mechanics lien sitting on your title creates uncertainty, and some claimants are content to let it linger without ever filing suit. Pennsylvania gives you two ways to force the issue.
Rule to File a Claim
If a subcontractor has finished work but hasn’t yet filed a lien claim, an owner or general contractor can file a rule requiring the subcontractor to file within 30 days or be permanently barred.8Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 506 This is a proactive move you can make before a lien even appears, clearing the air with subcontractors who might be considering a claim. If they don’t file within those 30 days, the right is gone forever.
The Two-Year Enforcement Deadline
Once a lien claim is on file, the claimant must commence an action to obtain a judgment within two years from the filing date, unless you agree in writing to extend the deadline.9Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 701 If the claimant doesn’t sue in that window, the lien becomes unenforceable and you can petition the court to strike it. Never agree to extend this deadline in writing unless you have a strong reason, because that two-year clock is one of your best automatic defenses.
Check for a Lien Waiver
Before launching a full defense, read your construction contract for waiver language. On residential projects, a contractor or subcontractor can waive lien rights through a signed written agreement or through conduct that makes it unfair for them to later claim a lien.10Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 401 A signed waiver from the contractor on a residential job is enforceable and can block the lien at the door.
Commercial projects work differently. A contractor’s waiver is void unless given in exchange for actual payment received, and only to the extent of that payment. A subcontractor’s waiver is similarly void unless the sub actually received payment or the general contractor posted a bond guaranteeing payment to subcontractors.10Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 401 Blanket advance waivers on commercial jobs are treated as against public policy, which is why conditional lien waivers tied to each progress payment are the standard practice on those projects.
What a Defense Will Cost
Pennsylvania’s lien law includes a fee-shifting provision that can help you in a narrow situation. When a subcontractor files a lien and the general contractor fails to settle, discharge, or defend against the claim, you can step in to fight the lien and recover all costs, expenses, and reasonable attorney fees from the general contractor, regardless of whether the defense succeeds.4Pennsylvania General Assembly. Mechanics Lien Law of 1963 – Section 501.6
Outside that provision, each side generally bears its own legal costs. Budget for attorney fees ranging from a few thousand dollars for straightforward preliminary objections to significantly more at trial. A complex commercial lien dispute with discovery, depositions, and expert witnesses can run into five figures. That cost reality is why spotting procedural defects early matters so much. Striking a lien on preliminary objections is faster, cheaper, and more decisive than litigating the underlying debt.