A construction lien, also called a mechanic’s lien or supplier’s lien, is a legal claim filed against your property by a contractor, subcontractor, or supplier who was not paid for work or materials. It attaches to your property title and can prevent you from selling or refinancing until it is resolved. You can receive a lien even if you paid your general contractor in full, if the contractor did not pay their subcontractors and suppliers.
Key Takeaways
- A construction lien gives unpaid contractors, subcontractors, and suppliers a legal claim on your property title.
- You can receive a lien even if you paid your general contractor, if the GC failed to pay downstream parties.
- Most states require preliminary notice (a 20-day notice or Notice to Owner) before a lien can be filed.
- Liens have strict deadlines: they must be filed within 30 to 120 days of the last work date depending on the state.
- An unpaid lien can prevent you from selling or refinancing your home until it is discharged.
- The best defense is collecting lien waivers from every contractor and supplier at each payment stage.
Table of Contents
- What a Construction Lien Is
- Who Can File a Mechanic’s Lien
- How a Construction Lien Gets Filed
- How a Lien Affects Your Property
- How to Remove a Construction Lien
- How to Prevent a Lien on Your Property
- Frequently Asked Questions
- Final Word
What a Construction Lien Is
A construction lien, known interchangeably as a mechanic’s lien (or ‘what is a mechanic’s lien’ in common searches), supplier’s lien, or contractor’s lien, is a legal claim attached to real property that protects contractors, subcontractors, laborers, and material suppliers against nonpayment. When someone performed work or supplied materials and was not paid, they can file a lien on your property. The lien sits on the title until the debt is resolved.
The legal theory behind the construction lien is that those who improve a property should not bear the financial risk of nonpayment. The lien shifts that risk back to the property owner by making the property itself the security for payment. This is a powerful remedy, because it is an encumbrance that attaches to the property regardless of who owns it and can survive a sale if not properly cleared.
Lien laws exist in all 50 US states and in most US territories, though the specific rules, deadlines, and notice requirements vary significantly from state to state. Understanding how construction liens work, including how they affect the scope of work and your payment rights, is essential for any homeowner undertaking a renovation, since the risk of a lien exists on every project. Our pillar guide to contractor contracts covers how to contractually require lien waivers to prevent this problem, and our guide to contractor lien waivers explains the four waiver types in detail. The AIA (American Institute of Architects) and FTC also publish guidance on consumer protections in construction that reference California Civil Code and equivalent state statutes.
Who Can File a Mechanic’s Lien
In most states, any party who contributes work, labor, or materials to a construction project that improves the property can file a mechanic’s lien if they are not paid. This typically includes:
| Party | Lien Rights |
| General contractor | Direct contract with owner; strong lien rights |
| Subcontractors | Work performed under GC; lien rights in all states |
| Material suppliers | Materials used in the project; lien rights in most states |
| Equipment lessors | Equipment rented for the project; lien rights in some states |
| Architects and engineers | Design services; lien rights in many states |
| Laborers | Direct work on the project; lien rights in most states |
The critical insight for homeowners is that subcontractors and suppliers have lien rights that are independent of the homeowner’s payment to the general contractor. A homeowner who pays the GC every draw on schedule can still face mechanic’s lien claims from an electrician, plumber, or lumber yard that the GC never paid. This is one of the most expensive surprises in residential construction and one of the best arguments for collecting lien waivers from every tier of the project.
How a Construction Lien Gets Filed
The lien filing process has several steps, most of which happen before the lien itself is recorded. The process differs by state, but the general structure is:
Step 1: Preliminary notice. In most states, a subcontractor or supplier must send a preliminary notice within a set time of starting work, usually 20 days. This is sometimes called a 20-day notice, Notice to Owner, or prelim. This notice identifies the claimant and the work they are performing. Without it, the claimant may lose their lien rights entirely.
Step 2: Work completion or stoppage. Lien rights typically begin to run from the date of last work, last delivery, or project completion, depending on the state. The claimant has a limited window after this date to file the lien.
Step 3: Lien filing. The claimant files a formal lien document (called a claim of lien, notice of lien, or similar) with the county recorder’s office where the property is located. The document identifies the claimant, the property, the amount owed, and the work performed. Once recorded, it becomes a public record attached to the property’s title chain.
Step 4: Enforcement. A lien is not a judgment. To collect, the claimant must file a lawsuit to foreclose the lien within another deadline, typically 90 days to one year after recording, depending on the state. If they miss this deadline, the lien expires.
The deadlines at each step are strict and unforgiving. A single missed deadline can void an otherwise valid lien claim. Understanding this timeline is useful for homeowners disputing a lien they believe was filed improperly or late.
How a Lien Affects Your Property
A recorded mechanic’s lien creates a cloud on title, meaning a cloud on your property’s title. It is a public record showing that an unpaid party has a claim against the property. The practical consequences are significant:
Selling is difficult. A title search before any property sale will reveal the lien. Most buyers require a clear title at closing. A seller must either resolve the lien before closing or negotiate with the buyer to place the disputed amount in escrow at closing. In practice, most buyers will not proceed with a lien outstanding.
Refinancing is blocked. A lender will not record a new mortgage on a property with an outstanding lien. Refinancing requires clearing the lien first, either by paying it or by bonding around it.
Title insurance issues. If you purchased title insurance when you bought the property, a new lien filed during a renovation may not be covered, since it arose after the policy was issued. This is a common misunderstanding. Title insurance generally covers liens that existed before the policy date, not those arising during your ownership.
Foreclosure risk. In extreme cases where the lien is not resolved, the lienholder can initiate lien foreclosure proceedings, which can result in a forced sale of the property to satisfy the debt. This rarely happens on residential projects, but the legal mechanism exists.
How to Remove a Construction Lien
There are several ways to remove or neutralize a mechanic’s lien filed against your property:
Pay the claim. If the claim is valid and the amount is correct, paying the claimant and obtaining a lien release (a formal document recorded to remove the lien) is the most straightforward resolution. This immediately clears the cloud on your title.
****Bond around the lien (bonding around a lien):. A surety bond in the amount of the lien can be recorded to substitute for the lien. This frees the property from the lien’s cloud while the underlying dispute continues. The bond is then the security for the claim instead of the property.
Challenge the lien. If a lien was filed past the deadline, for the wrong amount, or by a party without valid rights, you can challenge it. A quiet title action or a petition to release are the typical legal routes. Working with a construction attorney is advisable for this route.
Let it expire. If the claimant misses the enforcement deadline, the lien expires by operation of law, called lien expiration. You can then record a notice of expiration to formally clear the title and remove the cloud on title. This is a passive strategy that carries risk if the claimant does file suit in time.
For any lien claim over $5,000, consulting a construction attorney is worth the cost. The strategic options, timing, and state-specific rules are complex enough that professional guidance pays for itself. See our guide to how to handle a contractor dispute for the broader framework.
How to Prevent a Lien on Your Property
Prevention is far less expensive than resolution. The most effective prevention is a systematic lien waiver collection process tied to every payment, as covered in our guide to contractor lien waivers. At each payment stage, collect a conditional waiver from every contractor and supplier before payment, then follow up with an unconditional waiver once the payment clears.
Require your general contractor to provide a preliminary notice list at the start of the project identifying every subcontractor and supplier who has lien rights. This becomes your checklist for waiver collection. A GC who cannot or will not provide this list is a warning sign.
Also confirm that the general contractor is paying their subcontractors and suppliers. Ask for proof of payment to major subs at each draw stage. Some homeowners ask their GC to use joint checks for major subcontractors, meaning the check is made out to both the GC and the sub, so the sub must endorse it to receive payment. This prevents the GC from collecting a draw and failing to pass it to the subs. For the financial framework around protecting your payments, see our guides to the contractor payment schedule and hidden costs of hiring a contractor.
Frequently Asked Questions
What is a construction lien?
A construction lien (also called a mechanic’s lien or supplier’s lien) is a legal claim attached to property by a contractor, subcontractor, or supplier who was not paid for work or materials. It encumbers the property’s title and can prevent a sale or refinance until resolved. Lien rights exist in all 50 US states.
Can I get a construction lien if I paid my contractor?
Yes. If you paid your general contractor but the GC failed to pay their subcontractors or suppliers, those parties retain their own independent lien rights and can file a mechanic’s lien against your property. This is why collecting lien waivers from every tier of the project, not just from the GC, is essential.
How long does a construction lien last?
Lien deadlines vary by state. A lien must be filed within 30 to 120 days of the last work date, depending on the state. After filing, the claimant typically has 90 days to one year to file a lawsuit to foreclose the lien, or it expires. An expired lien can be formally cleared by recording a notice of expiration.
How do I remove a construction lien?
The main options are: pay the claim and record a lien release; bond around the lien with a surety bond; challenge the lien legally if it was improperly filed or untimely, or wait for it to expire if the claimant misses the foreclosure deadline. For any claim over $5,000, consult a construction attorney to choose the right approach.
What is a preliminary notice in construction?
A preliminary notice (also called a 20-day notice or Notice to Owner) is a document sent by a subcontractor or supplier early in a project to formally assert their lien rights. In most states, sending this notice is a prerequisite to filing a valid lien later. Homeowners who receive preliminary notices should track them as a list of parties from whom lien waivers must be collected.
Does title insurance protect against construction liens?
Generally no, for liens arising during your ownership. Title insurance issued when you buy a home covers liens and title defects that existed before the policy date. A mechanic’s lien filed during a renovation arises after the policy, so it is typically not covered. Collecting lien waivers is the correct protection during construction.
Final Word
A construction lien, or mechanic’s lien, is a legal claim on your property that any unpaid contractor, subcontractor, or supplier can file if they are not paid. It can prevent you from selling or refinancing until resolved, and you can receive one even if you paid your general contractor in full. Lien laws exist in all 50 states, but the specific rules, notice requirements, and deadlines vary by jurisdiction.
Prevention is far more effective than resolution. Collect lien waivers at every payment stage from every party with lien rights, require your GC to maintain a preliminary notice list, and consider joint checks for major subcontractors. If a lien is filed despite your precautions, work with a construction attorney to choose the right removal strategy. For the complete protection framework, see our guides to contractor lien waivers, the contractor contract, and how to handle a contractor dispute.
