A mechanics lien is the most powerful collection tool available to contractors and subcontractors. When a property owner or GC refuses to pay, a properly filed lien attaches to the property title — making it nearly impossible to sell or refinance until the debt is resolved. Used correctly, it turns an unpaid invoice into a secured debt.
Used incorrectly — wrong deadline, missing preliminary notice, defective filing — a lien is worthless paper. Lien law is unforgiving. Miss the deadline by one day and you've lost your rights entirely.
This guide explains how mechanics liens work, what you must do before filing, and how to use the process to actually get paid.
How Mechanics Liens Work
A mechanics lien (also called a materialman's lien, construction lien, or contractor's lien depending on state) is a security interest against real property granted to parties who improve that property without receiving full payment. The legal theory is straightforward: if you added value to someone's property and weren't paid, you have a claim against that property.
Who can file: Contractors, subcontractors, sub-subcontractors, material suppliers, equipment rental companies, and design professionals (architects, engineers) generally have lien rights. The specific list varies by state.
What it does: A recorded lien attaches to the property's title. It clouds the title — meaning a title search will show the lien, and no title insurance company will insure around it. The owner cannot sell or refinance without resolving the lien. This is the leverage.
The enforcement path: If the lien isn't paid or bonded off, the claimant can foreclose on the lien — forcing a sale of the property to satisfy the debt. Foreclosure is rarely necessary because the title cloud is usually enough pressure to produce payment. Most liens are resolved through negotiation within 60–90 days of recording.
Priority: Mechanics liens typically have priority over mortgages and other liens recorded after construction began. This is what makes them powerful — your unpaid invoice can be senior to the bank's mortgage.
The Three-Step Lien Process
Lien rights don't arise automatically from doing work. You must follow the prescribed process exactly:
Step 1: Preliminary Notice (Required in Most States)
Most states require you to serve a preliminary notice on the property owner (and often the GC and lender) early in the project — before or shortly after starting work. This notice tells the owner who you are, what work you're doing, and that you have potential lien rights.
Critical point: In most states, if you don't serve the preliminary notice on time, you lose your lien rights entirely, regardless of how valid your claim is. You can't file a lien for work done before you were required to give notice.
Preliminary notice deadlines by type of claimant:
- GC/prime contractor: Usually no preliminary notice required — the GC has a direct contract with the owner.
- Subcontractors and suppliers: Typically must serve within 20 days of first furnishing labor or materials (California), 45 days (Arizona), or "before project completion" (Texas, for sub-subs). Deadlines vary significantly.
States with strict preliminary notice requirements include California (20 days — no exceptions), Arizona (20 days), Nevada (31 days), Washington (60 days for subs, 10 days for sub-subs).
States with no preliminary notice requirement: New York, Florida (for direct contracts), Virginia, Massachusetts. In these states, lien rights exist automatically — but you still must file the lien itself on time.
Serve the notice properly: Most states require certified mail or personal delivery. Email doesn't count. Keep the certified mail receipt as proof of service.
Step 2: File the Lien
After the preliminary notice window, if payment isn't coming, you file the lien itself with the county recorder's office in the county where the property is located. Most states have a standard lien form; some require specific language.
Filing deadlines are hard cutoffs:
| State | Subcontractor Lien Deadline |
|---|---|
| California | 90 days after completion of the project (or 60 days after a Notice of Completion is recorded) |
| Texas | 15th of the 3rd month after the month in which work was last furnished |
| Florida | 90 days after last furnishing labor or materials |
| New York | 8 months after last furnishing (1 year for improvements to single-family dwellings) |
| Georgia | 90 days after substantial completion of the project |
| Illinois | 4 months after last furnishing |
| North Carolina | 120 days after last furnishing |
| Washington | 90 days after substantial completion |
| Colorado | 4 months after last furnishing |
Do not rely on memory for these dates. Use a lien rights management service or set a calendar alert the day you first show up on a job. Every project, every time.
What goes in the lien: Property description (legal description, not just the street address), name and address of the owner, name and address of the person who hired you, amount claimed, and a description of the work provided. Errors in the property description or owner information can invalidate the lien.
Filing fee: Typically $15–$45 per document at the county recorder's office.
Step 3: Enforce or Release
After filing, you have a window to enforce the lien through a foreclosure lawsuit. Enforcement deadlines vary — California requires suit within 90 days of the lien filing; Texas within 2 years.
In practice, most lien claims resolve before enforcement because:
- The title cloud creates immediate pressure on the owner
- Construction loan draws are typically contingent on lien releases — a recorded lien stops the owner's ability to draw funds from their construction loan
- Buyers and lenders won't close with a recorded lien
If the dispute doesn't resolve, you can:
- File a foreclosure action: Hire a construction attorney and sue to foreclose the lien. The property can be sold to satisfy the judgment.
- Accept a lien bond: Some owners will substitute a surety bond for the recorded lien. This releases the title but transfers your claim to the bond — you can still recover against the bond.
- Negotiate a payment: Most disputes settle for some amount once the lien is filed and the owner understands you're serious.
The GC Perspective: Managing Sub Lien Exposure
If you're a general contractor, you need to manage your subcontractors' lien rights — because a sub can lien the property for work you've already been paid for by the owner. This is the construction payment trap that catches owners and GCs off guard.
Conditional lien waivers on every draw: A conditional lien waiver releases lien rights for the period covered by a specific payment, conditioned on that payment actually clearing. Always get conditional waivers from every sub and supplier when you make a payment.
Unconditional waivers on final payment: Get unconditional lien waivers (waiving all lien rights for work completed to date) from every sub and supplier before releasing final retainage.
Joint checks: For large subs or suppliers with significant balances, consider issuing joint checks payable to both the sub and their key suppliers. This ensures the money flows through.
The payment chain matters: If a sub doesn't pay their material supplier, the supplier can lien the property even though you paid the sub. The lien follows the improvement to the property, not the payment chain. Construction payment terms and lien waiver management are directly connected — a GC who manages both protects the owner's title.
What to Do When You're Not Getting Paid
Here's the practical sequence when a client isn't paying:
- Send a formal demand letter with a specific cure deadline (7–10 days). Most payment issues resolve here.
- Serve the preliminary notice if you haven't (if you're still within the window).
- File the lien immediately if the demand deadline passes. Don't wait and negotiate past your deadline.
- Notify the construction lender (if you know who it is). Lenders hate liens more than owners do — the lender will often pressure the owner to resolve it.
- Consult a construction attorney if the amount justifies it (typically $15,000+). Foreclosure actions require legal representation.
The most common mistake contractors make is waiting too long. You keep hoping the payment will come, the relationship will work itself out, and suddenly your deadline has passed. File first, negotiate later. A filed lien doesn't prevent you from accepting payment and releasing it.
Lien Waivers: What You're Signing Away
A lien waiver is an agreement to relinquish your lien rights in exchange for payment. Read what you're signing:
Conditional waiver (progress): Waives lien rights for work through a specific date, conditioned on the specific payment being received and clearing. This is safe to sign when you're receiving a draw payment.
Unconditional waiver (progress): Waives lien rights through a specific date with no conditions — even if the payment doesn't clear. Never sign an unconditional progress waiver before the check clears.
Conditional waiver (final): Waives all lien rights conditioned on final payment clearing. Safe to sign when receiving the final payment.
Unconditional waiver (final): Waives all lien rights permanently with no conditions. Only sign this after final payment has fully cleared your bank.
When GCs or owners send you lien waiver language to sign, compare it against the standard forms for your state. Non-standard language sometimes waives claims beyond lien rights — including contract claims and change orders.
FAQ
What is a mechanics lien in construction? A mechanics lien is a legal claim against real property filed by contractors, subcontractors, or suppliers who performed work or provided materials and were not paid. It clouds the property title and prevents sale or refinancing until the debt is resolved.
How long do I have to file a mechanics lien? Deadlines vary by state, typically ranging from 60 to 120 days after you last furnished labor or materials. Some states run the clock from project completion rather than your last work date. Missing the deadline forfeits your lien rights entirely.
Do I need a lawyer to file a mechanics lien? Not necessarily for the filing itself — most states have standard forms available at the county recorder's office. For amounts over $15,000 or if the matter proceeds to foreclosure, hiring a construction attorney is strongly recommended.
Can a subcontractor file a lien even if the GC has been paid? Yes. A sub can lien the property for their unpaid balance even if the owner has already paid the GC in full. This is why GCs collect lien waivers from subs as a condition of every payment.
What is a preliminary notice in construction? A preliminary notice is a required document served on the property owner (and often the GC and lender) early in a project, notifying them that you are providing labor or materials and may have lien rights. In many states it's mandatory for subcontractors — missing it forfeits lien rights.
Can a property owner stop a mechanics lien? An owner can dispute a lien (assert it was improperly filed, the amount is wrong, or work was defective) or substitute a surety bond for the recorded lien. A bonded lien releases the property title while keeping the claimant's rights alive against the bond.
