A mechanics lien and commercial collection are not interchangeable remedies for an unpaid construction invoice. A lien or payment-bond claim may preserve a statutory payment right tied to a project, while commercial collection generally seeks payment under the contract or invoice; the correct sequence depends on the project, the parties’ roles, and the law that applies.
Start with the project and the payment chain
Before sending a demand or assigning an account, identify whether the work was on private property, a federal project, or a state or local public project. Then identify the owner, direct contractor, subcontractors, surety, and the party that ordered the labor or materials. The contract, purchase order, change orders, and the dates of first and last furnishing should be reviewed together. A collection conversation should not be treated as a substitute for preserving a statutory lien or bond deadline.
The practical distinction is straightforward:
- Mechanics lien: a state-law remedy that may secure a claimant’s interest against a private work of improvement when statutory prerequisites are met.
- Payment-bond claim: a claim against a surety bond that may protect labor and material suppliers on certain public projects.
- Commercial collection: a process for documenting the balance, requesting payment, negotiating a resolution, and deciding whether a contract claim should be referred to counsel.
None of these labels answers whether a particular claim is valid. Contract language, notices, project classification, licensing issues, the claimant’s tier, and state law can all affect the result.
Why the deadline calendar comes first
Construction payment rights are often deadline-driven. Track the last date labor was performed or materials were supplied, the date of any completion or cessation notice, and every notice sent or received. Do not use a generic “90-day rule” across projects: the required notice, filing, service, and enforcement periods can differ by jurisdiction and claimant type.
California provides a useful example of why a project-specific review is necessary. Subject to statutory exceptions, California Civil Code section 8200 makes preliminary notice a prerequisite to the validity of a lien claim, stop-payment notice, or payment-bond claim and identifies the owner, direct contractor, and construction lender as notice recipients. Read California Civil Code section 8200. For a direct contractor, California Civil Code section 8412 requires recording a lien claim after completing the direct contract and before the earlier of 90 days after completion of the work or 60 days after the owner records a notice of completion or cessation. Read California Civil Code section 8412. Those are California rules, not a national timetable.
Public work may require a bond review instead of a lien assumption
Public-project remedies differ from private-project remedies. On qualifying federal construction, alteration, or repair contracts over $100,000, federal law requires performance and payment bonds, subject to the statute’s stated exceptions. See 40 U.S.C. § 3131. The federal payment-bond statute gives eligible people who furnished labor or material a cause of action after nonpayment, but a claimant with a direct contractual relationship only with a subcontractor must give the prime contractor written notice within 90 days after its last labor or materials. An action must be brought no later than one year after that last furnishing date. See 40 U.S.C. § 3133.
Those federal provisions do not establish the rules for state or local public work. For any public project, obtain the bond information and have the applicable statute, procurement documents, and claimant tier reviewed promptly.
Read contingent-payment language carefully
Construction contracts sometimes use contingent-payment language. A pay-when-paid provision may address the timing of a subcontractor’s payment. A pay-if-paid provision may attempt to make owner payment a condition of the general contractor’s payment obligation. The legal effect of either label depends on the actual wording and governing law; it should not be assumed from the label alone.
For example, California Civil Code section 8122 provides that an owner, direct contractor, or subcontractor may not waive, affect, or impair another claimant’s rights under that part of the statute, and it makes a conflicting contract term void and unenforceable until the claimant executes and delivers the specified waiver and release. Read California Civil Code section 8122. That provision concerns statutory rights under California’s works-of-improvement law; it is not a universal ruling on every payment clause or every state’s contract law.
When commercial collection is useful
Commercial collection can be useful while statutory remedies are being evaluated or after the available project remedies have been assessed. A disciplined file helps establish what is being requested and why: the executed agreement, scope changes, delivery tickets, approved work records, invoices, payment applications, correspondence, notices, and an account reconciliation should be retained together.
A collection effort does not create a lien, extend a statutory deadline, or by itself establish personal liability. In particular, nonpayment alone does not justify assuming that an owner, officer, affiliate, or other party can be pursued outside its contractual or legal obligations. If the account will be escalated, the demand should accurately identify the creditor, amount, supporting documents, disputes, and the party believed to owe payment.
A practical decision framework
| Situation | Key question | Practical next step |
|---|---|---|
| Private project | Which state’s lien statute applies, and what notices, recording steps, and enforcement deadlines apply to this claimant? | Preserve dates and documents; obtain jurisdiction-specific legal guidance before a deadline passes. |
| Federal project | Is there a payment bond, and what is the claimant’s contractual tier? | Request bond information and assess the federal notice and suit periods promptly. |
| State or local public project | Does the governing public-works law use a payment bond or another statutory remedy? | Review the applicable statute and procurement documents rather than assuming federal rules apply. |
| Contract dispute or unpaid invoice | What documents support the amount, and what defenses or setoffs have been raised? | Reconcile the account and use accurate, documented commercial collection communications. |
Records to preserve
- The signed contract, purchase order, credit application, and any incorporated terms.
- Change orders, delivery tickets, invoices, payment applications, and proof of work performed or materials supplied.
- The dates of first and last furnishing, project completion information, and copies of notices with delivery evidence.
- Owner, contractor, subcontractor, lender, and surety information, including the legal names used in the project documents.
- A dated reconciliation showing payments, credits, retainage, disputed items, and the amount sought.
Bottom line
Handle a construction delinquency as both a documentation issue and a deadline issue. Preserve possible lien or bond rights first, then use commercial collection for a documented contract claim where appropriate. Because the availability and timing of these remedies are highly jurisdiction- and fact-specific, a qualified construction attorney should review the file before a statutory deadline or filing decision.
Related reading
For broader accounts-receivable controls, see AR Audit Defense: The Reconciliation & Revenue Assurance Protocol. For a discussion of distressed commercial invoices, see Commercial Receivables Liquidity: Converting Distressed Invoices to Capital.