What Is a Mechanic’s Lien in Pennsylvania? The Complete Guide

A mechanic’s lien is a legal tool contractors and subcontractors use to make sure they get paid when a customer refuses to pay for completed work. It’s built around the kind of $10,000 to $250,000 jobs that make up most contracting and subcontracting work, not large commercial projects, which are typically over $1.5 million and follow a different process.

What Is a Mechanic’s Lien, and Who’s Who?

Before getting into how a mechanic’s lien works, a few terms matter:

• The owner is the person who owns the property where the work is being performed. The owner may or may not be the one who actually entered into the contract for the work.
• A contractor is typically the person who enters into an agreement directly with the owner to perform the work, whether that’s installing windows, doing floors, or renovating a kitchen. A contractor can also be an architect or engineer who contracts directly with the owner.
• A subcontractor has a contract with the contractor, not with the owner, and usually hasn’t dealt directly with the owner at all.

Because small business contractors and subcontractors make up most of the people who use mechanic’s liens, which one you are changes the rules that apply to you. The best way to tell: did you enter into an agreement with a contractor, or with the property owner directly? If it was the owner, you’re the contractor. If it was another contractor, you’re the subcontractor, and different filing rules apply.

One more term worth knowing: completion of work. This is the point when either the last materials or the last substantial piece of work is delivered to the property. If you finish a kitchen (cabinets installed, materials on site) but a few small touch-ups remain, the work is still considered substantially complete. The clock doesn’t wait for those touch-ups to be finished.

Mechanic’s Lien Deadline Calculator

Mechanic’s Lien vs. a Judgment: What’s the Difference?

A judgment and a mechanic’s lien work in opposite directions.

A judgment is typically what you get at the end of a trial or legal proceeding, after a court has had the chance to determine who’s at fault and how much money is owed.

A mechanic’s lien goes the other way. You file it first, shortly after completing the work, to preserve your right to collect. Only afterward do you go and figure out exactly how much is owed. Even so, you still have to act in good faith, and the actual damages need to be explicitly set out in the filing.

In practical terms, a mechanic’s lien is a way to tell the property owner: you owe me money, so don’t sell this house, don’t get a new mortgage, and don’t do anything else with this property until your obligations have been paid.

Who Can File a Mechanic’s Lien?

To file a mechanic’s lien, your claim has to be worth more than $500. Below that, a lawyer usually isn’t involved, and realistically it’s often better to let a small claim go than to spend more money chasing it than it’s worth.

The rules below are typical, not universal. There are exceptions, and situations are fact specific: this is general information, not a substitute for a lawyer reviewing your particular case before you act. Also, this is specific to Pennsylvania. Different states have different rules for Mechanic’s liens.

Contractors. A contractor can typically file a lien without giving the owner any advance notice, because the owner already knows the contractor has a claim against them for nonpayment. A contractor can generally file as soon as they know they aren’t going to get paid.

Subcontractors. A subcontractor has an extra step: 30 days’ notice to both the contractor and the owner before filing. The point of that notice is to give an owner, who may have no idea a subcontractor is even working on their property, a chance to check whether money is actually owed and unpaid, or whether it’s already been paid.

There’s also a carve-out for subcontractors on residential property. If you did work on a home the owner lives in or rents out, and the contractor was already paid in full by that owner, you can’t file a lien against the owner or the property. Your claim in that case is really against the contractor, not the homeowner.

Giving notice before filing, even for contractors who technically don’t have to, is worth considering. People generally want to resolve payment disputes before spending money on a lawyer or going to the courthouse, since that just adds delay. Notice gives the owner about 30 days to respond and potentially settle before things escalate.

How Long Do You Have to File, Serve, and Confirm a Mechanic’s Lien?

A mechanic’s lien can only be filed within 6 months of the completion of the work, using the same “substantially complete” standard covered above. That six-month clock runs from the date most of the work was finished, not from the date any final touch-ups were wrapped up.

Filing is only the first deadline. Once you’ve filed the lien, you have 30 days to serve it. How that happens depends on where the property is:

• In Philadelphia, a process server can serve it, which is usually relatively straightforward.
• In the surrounding counties, it has to be served by a sheriff.

Sheriffs can take time to get out and serve the lien, and people being served sometimes try to dodge it (not answering the door, pretending they’re not home, keeping the gate locked). Because service can take a while, get the lien to the sheriff’s office as soon as possible after filing rather than waiting.

After the lien has been served, you have 20 more days to notify the court that service happened.

Put together, the full timeline looks like this:

1. 6 months from substantial completion of the work to file the lien.
2. 30 days after filing to serve it.
3. 20 days after service to notify the court that it was served.

Miss any of these windows and the consequences are real: if a lien isn’t served in time, or the court isn’t notified in time that it was served, the lien can be stricken and you lose your place in line.

What Information Do You Need to File a Mechanic’s Lien?

A mechanic’s lien filing needs to answer the basics: what, when, where, why, and how much. Specifically, it should include:

1. Your name, and whether you’re filing as the contractor or the subcontractor.
2. The owner’s name and address. If the owner lives somewhere other than the property in question, include both addresses.
3. The amount you’re claiming is owed, which can include legal fees if that was part of what you contracted for.
4. Who you contracted with. If you contracted with the owner directly, say so. If you contracted with a contractor (meaning you’re filing as a subcontractor), attach the notice you sent and show that it went out at least 30 days before you filed.
5. The contract or scope of work: what materials you provided and what labor you performed. This doesn’t need to be exhaustively detailed if you have an agreement or scope-of-work document you can attach.
6. The date the work was substantially complete, so anyone reading the lien can confirm it was filed within the 6-month window.
7. A good description of the property. Beyond the street address, this means the parcel ID or lot number from the county’s own records. The exact way counties label this varies, so check the specific county’s records for the property.

Once the filing is in, don’t lose track of the deadlines that follow: serve it within 30 days, and notify the court that it’s been served within 20 days of service.

What Happens When a General Contractor Won’t Pay a Subcontractor?

Timing works differently, and less generously, for subcontractors than for general contractors.

A general contractor who shows up close to the end of the six-month window, even as late as five months and ten days after completion, might still be able to file the lien. A subcontractor doesn’t have that room. Subcontractors need 30 days to provide notice to the homeowner before filing, so waiting until the last few weeks simply doesn’t leave enough time. That means a subcontractor has to be more vigilant, and protect their rights earlier, than a general contractor does.

Here’s a scenario that plays out often: a homeowner refuses to pay the general contractor the full amount owed. The general contractor, in turn, tells the subcontractor they haven’t been paid either, so the subcontractor isn’t getting paid right now. The subcontractor is then left to pursue the homeowner directly, even though the subcontractor likely never contracted with that homeowner at all. That usually means tracking down the homeowner’s contact information from the general contractor, who may or may not hand it over quickly.

Because of this, a general contractor’s six-month window tends to erode fast in practice. If a general contractor hasn’t been paid within the first 30 days, it’s worth starting to think seriously about the lien. For a subcontractor, the timeline is tighter still: since typical payment terms run 30 days, by the time 90 days have passed unpaid, a subcontractor really needs to act, since preparing and sending the required notice letter takes about a month on its own. Waiting too long, and treating it as something to deal with later, risks missing the filing window altogether.

It’s worth knowing that a subcontractor’s dispute with the general contractor over nonpayment is a separate legal matter from the mechanic’s lien itself. Even if a subcontractor loses the right to file a lien, they can still bring a regular lawsuit: breach of contract, breach of implied contract, or unjust enrichment, among other claims.

Before any of this becomes an issue, it’s worth having a lawyer look at your subcontractor agreement. Some of these agreements contain language waiving the subcontractor’s right to seek a lien in the first place. Contractors sometimes agree with the homeowner not to seek any lien on the property at all, an agreement that can bind the subcontractors working under them too. If you’re a subcontractor, it’s reasonable to ask the general contractor directly whether they’ve signed any waiver of lien, or anything else related to filing a lien on the property.

Release of Lien: What to Watch For Before You Sign

A “release of lien” is a document where a subcontractor agrees not to file a mechanic’s lien on a property. Used the right way, it’s simple and reasonable: once a subcontractor has been paid in full for their work, they sign the release confirming they won’t come after the property later.

The problem is when that gets flipped around. Some general contractors ask subcontractors to sign a release of lien before any work has even started, or before the subcontractor has been paid a single dollar. Subcontractors, often smaller mom-and-pop businesses, don’t always recognize this for what it is. If a subcontractor pushes back on signing early, a general contractor will sometimes agree to change the terms, but sometimes will just find a different subcontractor willing to sign it instead.

Here’s the part that surprises people: courts don’t automatically protect you from an early release of lien. There’s no built-in court rule that voids a release just because it was signed before you did any work or got paid. There’s a real argument that a release signed with nothing paid in exchange might not hold up, but by the time a judge actually reviews that question, each side will typically have spent tens of thousands of dollars getting there. Practically speaking, that often means it doesn’t matter whether the release is technically valid or not, even though validity does matter if a dispute goes all the way through the court system.

Think about what that means in dollar terms. If you did a $20,000 to $50,000 job as a subcontractor, then spend six months to a year fighting this out in court, you can end up spending tens of thousands of dollars more on top of the amount you were never paid in the first place. The mechanic’s lien statute exists specifically to protect against that kind of situation, and signing a release of lien early is one of the main things that can take that protection away from you.

The general takeaway: read documents carefully before signing them. Confirming you’ve actually been paid first, or having a lawyer review the agreement, is worth the extra step.

Mechanic’s Lien FAQ

Talk to Kaminsky Law

Mechanic’s liens involve tight deadlines and paperwork that has to be exact, and the rules change depending on whether you’re the contractor or the subcontractor on the job. If you’re facing a nonpayment situation, dealing with a release of lien you’re unsure about, or need help meeting one of these deadlines, contact Kaminsky Law to talk through your specific situation.

Related Reading

• Why Pennsylvania Contractors Need an HICPA Contract for All Jobs
• Legal Essentials for Your Small Business
• Contract Basics: What Are Material Terms?

This article is general information based on a recorded discussion. It is not legal advice and does not create an attorney client relationship. Every case is different. Prior results do not guarantee a similar outcome. For advice about your situation, contact Kaminsky Law directly.

Anton Kaminsky Partner

Anton Kaminsky is the founder of Kaminsky Law and a Philadelphia business and employment litigator. He spent over a decade in finance and banking, including trading equities and evaluating strategies at a hedge fund, before earning his law degree at Temple and litigating for five years at Bochetto & Lentz. He represents small businesses and individuals in shareholder disputes, contract fights, and employment claims across Pennsylvania and New Jersey.

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