Construction debt collection works differently from ordinary commercial collections because the industry has its own remedies: mechanic’s liens against the property, stop payment notices against undisbursed project funds, and claims against payment bonds. Each carries strict deadlines, and missing one can wipe out your strongest option. The practical sequence is to build a complete project file, send a written demand, choose the remedy that fits the project, and file suit only if those pressure tools don’t produce payment.
Build the Project File First
Before you take any formal step, pull everything related to the job into one place. Start with the written contract, which sets the scope, the payment schedule, and any dispute resolution clause. Add every signed change order, because those substantiate work beyond the original agreement.
Compile a chronological record of unpaid invoices showing labor performed, materials supplied, and amounts outstanding. Back each invoice with timesheets, purchase orders, delivery receipts, and inspection sign-offs. Save the emails, texts, and letters where the other side discussed the project or the balance owed; these often show the debtor acknowledged the debt or agreed to specific terms.
You also need information about the property itself. A mechanic’s lien filing requires the property’s legal description, which comes from county land records. Get the owner’s full legal name and current address. If you are a subcontractor or supplier, gather the same information for the general contractor, because some notices must be served on both.
Send a Demand Letter
A clear demand letter resolves more construction payment disputes than most people expect. Identify the project, state the exact amount owed, reference the contract and invoice numbers, and set a firm deadline. Include language stating that you intend to file a mechanic’s lien or pursue legal action if the balance is not resolved by that date.
The letter does two things at once. It creates a written record that you tried to resolve the matter before escalating, which courts and arbitrators view favorably. It also signals that you know your rights. Many owners and general contractors pay or negotiate once they see a lien filing is imminent, because a recorded lien complicates refinancing, sales, and title insurance.
Pick the Right Remedy for the Project
The tool you use depends on who owns the property and how the project is financed. On private projects, a mechanic’s lien against the real estate is usually the strongest option, with a stop payment notice available against any construction loan funds still undisbursed. On public projects, you cannot lien government property, so payment bond claims and stop payment notices carry the load. Federal projects have their own bond regime under the Miller Act. Where a payment bond exists, you claim against the bond instead of the property.
How a Mechanic’s Lien Works
A mechanic’s lien attaches a legal claim to the property where the work was performed, turning the real estate into collateral for the unpaid debt. Once recorded, the lien appears in public property records and clouds the title, making it difficult for the owner to sell or refinance until the debt is resolved.
General contractors, subcontractors, material suppliers, equipment lessors, and design professionals such as architects and engineers can all file. The common requirement is that your work or materials contributed to a permanent improvement of the property. Purely temporary work or materials that never became part of the structure generally do not qualify.
Where Your Lien Sits in Line
When multiple creditors have claims against the same property, the order of payment matters. In many states, mechanic’s liens benefit from a relation-back doctrine: the lien’s priority dates from when construction first visibly began on the property, not from when the lien was recorded months later. That can put a mechanic’s lien ahead of a mortgage or other encumbrance recorded after construction started.
A mortgage recorded before any construction began almost always takes priority over a mechanic’s lien. In a foreclosure, that lender is paid first, and if little equity remains, the lien claimant may recover only a fraction of the debt. Knowing where your lien falls tells you whether foreclosure is worth pursuing or whether negotiation is the better path.
Filing Steps and Deadlines
In many states, the first step is sending a preliminary notice to the property owner, general contractor, and construction lender, sometimes required within 20 days of when you start work or deliver materials. The notice does not mean you are filing a lien or that a dispute exists. It puts the relevant parties on notice that you are contributing to the project and have lien rights. Subcontractors and suppliers who skip this step in states that require it lose the ability to file a lien later, regardless of how much they are owed.
If the demand letter does not produce payment, draft and record the formal lien claim. It must include your name and contact information, the amount owed, a description of the labor or materials you provided, and the property’s legal description. File it with the recorder’s office in the county where the property sits. Recording fees vary, typically ranging from around $25 to over $200. Some jurisdictions require the lien document to be notarized before filing. After recording, serve a copy on the property owner and, in some states, the general contractor. Every state sets its own deadlines for each step, and missing any of them can void the entire claim.
Lien Waivers: The Document That Trips People Up
Lien waivers give up your right to file a lien in exchange for payment. They come in two forms, and the difference matters more than it looks.
A conditional waiver only takes effect once payment actually clears. You sign, but your lien rights remain intact until the check clears or the wire hits your account. It protects you from signing away your rights and then having the payment fall through.
An unconditional waiver takes effect immediately upon signing, whether or not you have received payment. Signing one before the money is in hand is one of the most common and costly mistakes in construction. Once signed, the lien rights for that amount are gone even if the check never comes.
Both types exist in progress and final versions. A progress waiver covers a specific draw and leaves your lien rights intact for the remaining balance. A final waiver covers the entire project and eliminates all remaining lien rights. Do not sign a final waiver until every dollar owed, including retention, has been received. Countless subcontractors get burned here: they sign the final waiver to keep the relationship smooth, expect the last check any day, and it never arrives.
Stop Payment Notices
A stop payment notice targets undisbursed project funds rather than the property itself. You send a notice to the owner or construction lender demanding that they withhold a portion of the remaining project budget in the amount of your claim. The effect is to freeze money that would otherwise flow to the general contractor, creating direct pressure to resolve the dispute.
On private projects with a construction loan, a bonded stop notice carries more force. When you post a bond alongside the notice, the lender is legally obligated to withhold the claimed amount. An unbonded stop notice on a private project may not carry the same weight. On public projects, stop notices are generally effective without a bond, because liens cannot be placed on government-owned property and the stop notice fills that gap.
Timing is strict and varies by state, but the notice generally has to be filed while funds are still available. Once the loan is fully disbursed, there is nothing left to freeze.
Payment Bond Claims
On many public works projects, and some large private ones, the general contractor is required to obtain a payment bond from a surety. The bond guarantees payment to subcontractors and suppliers. If the general contractor does not pay, you claim against the bond instead of filing a lien.
Federal Projects and the Miller Act
Federal construction contracts over $100,000 require the general contractor to furnish a payment bond under the Miller Act. The bond must equal the total contract amount unless the contracting officer determines that amount is impractical, but it can never be less than the performance bond amount.1Office of the Law Revision Counsel. 40 USC 3131 – Bonds of Contractors of Public Buildings or Works
If you furnished labor or materials on a federal project and have not been paid in full within 90 days after finishing your work, you can bring a civil action on the payment bond. A second-tier claimant, meaning someone who contracted with a subcontractor rather than the general contractor directly, must give written notice to the general contractor within 90 days of their last day of work. The notice must state the amount claimed and identify whom the materials were furnished to or for whom the labor was performed. Regardless of tier, the lawsuit must be filed no later than one year after your last day of labor or material delivery on the project.2Office of the Law Revision Counsel. 40 USC 3133 – Rights of Persons Furnishing Labor or Material
State and Private Bond Claims
State public works projects have their own bonding requirements, often modeled on the Miller Act but with different dollar thresholds and deadlines. On private bonded projects, the process depends on the bond’s terms. Either way, identify the surety company listed on the bond and review the bond for notice requirements. Provide written notice to both the general contractor and the surety, stating the amount owed and the work performed. The surety then investigates and either pays or denies the claim. If denied, litigation against the surety is the next step.
Joint Check Agreements
A joint check agreement is a less formal payment protection tool. The owner issues a check payable to both the general contractor and the subcontractor or supplier. Both parties must endorse the check to cash it, which prevents the general contractor from receiving funds and failing to pass them down the chain.
Owners typically use joint checks when there is reason to believe the general contractor is not paying its subs. The mechanism protects the owner from the liens and claims that arise when lower-tier parties go unpaid. For the arrangement to work, put the terms in writing, specifying the purpose of the payments and each party’s obligations. A joint check agreement does not replace lien rights, but it can prevent payment disputes from developing in the first place.
Filing a Lawsuit
Breach of Contract
A breach of contract lawsuit can be filed with or instead of a lien claim. You ask the court to order the non-paying party to pay the amount owed under the contract. Unlike a lien, this claim does not require preliminary notice or recording deadlines. It does require a valid contract and proof that the other party failed to perform its payment obligations. The statute of limitations varies by state but is typically between three and six years.
Before filing, check your contract for a mandatory arbitration or mediation clause. These are common in construction contracts, and if yours has one, a court may refuse to hear the case until you have gone through the required process. Arbitration can be faster and less expensive than litigation, but it also limits your appeal options if the outcome goes against you.
Lien Foreclosure
If a property owner refuses to pay after you have recorded a lien, the enforcement step is a foreclosure lawsuit asking the court to order the sale of the property, with the proceeds used to satisfy your claim. The critical deadline is the time limit for filing the foreclosure action after recording. In some states this window is as short as 90 days. Others give a year or more. Miss it and the lien expires automatically, taking your secured position with it, though a breach of contract claim may still exist.
Most foreclosure cases settle before any property is actually sold. The lawsuit creates enough urgency that owners find a way to pay or negotiate. Willingness to follow through to a court-ordered sale is what gives the lien its teeth.
The Risk of Filing an Invalid Lien
A mechanic’s lien is powerful, but filing one without a legitimate basis can backfire. An owner who believes the lien was filed falsely or for an inflated amount can bring a slander of title claim. To succeed, the owner must show that the lien contained a false statement about what was owed, that it was filed knowing it was false or with serious doubts about its accuracy, and that the false filing caused actual financial harm.
Damages in a slander of title case can include the reduced sale price caused by the cloud on title, expenses the owner incurred while the property could not be sold or refinanced, and attorney fees spent getting the lien removed. Filing for work you did not perform, inflating the amount to include items that are not lienable, or refusing to release a lien after being paid in full all invite this kind of counterclaim. Releasing the lien after a lawsuit is filed does not necessarily end the exposure.
If Collection Fails: Tax Treatment
When collection efforts ultimately fail, you may be able to claim a bad debt deduction. Business bad debts are deductible, but only if the amount owed was previously included in your gross income. Your accounting method matters here. If you are on the cash basis, as many small contractors are, you generally cannot deduct unpaid invoices for work you performed, because you never reported that income in the first place. There is nothing to deduct. If you are on the accrual basis and already reported the income when you billed it, the unpaid amount becomes deductible when the debt is worthless.3Internal Revenue Service. Topic No. 453, Bad Debt Deduction
To claim the deduction, you must show the debt is genuinely worthless, meaning there is no reasonable expectation of repayment. The IRS expects you to demonstrate that you took reasonable steps to collect. A court judgment proving the debtor cannot pay is not required, but you do need evidence that further collection would be futile. Take the deduction in the year the debt becomes worthless and report it on Schedule C or your applicable business tax return.3Internal Revenue Service. Topic No. 453, Bad Debt Deduction
If you settle a debt for less than the full amount and you are an applicable financial entity, you may need to issue a Form 1099-C to the debtor for cancelled debt of $600 or more. Most contractors will not meet that definition, but if you have extended significant credit on a project, check with your accountant.4Internal Revenue Service. About Form 1099-C, Cancellation of Debt