Mechanics Lien
A mechanics lien (or “mechanic’s lien” / “construction lien”) is a statutory legal claim against the real property a contractor has improved, securing that contractor’s right to payment for labour and materials. It is the defining payment-protection mechanism of the United States, where there is no UK/Australia-style national Prompt Payment Legislation: instead, every state has its own lien statute giving general contractors, subcontractors, suppliers and labourers a security interest in the building they helped construct.
Mechanics Lien [opposes] Global Subcontractor Payment Delays Mechanics Lien [part-of] United States
The lien works by converting an unsecured receivable into a secured claim against the property: an unpaid subcontractor can cloud the title and ultimately force a sale to recover what it is owed. This makes liens “very effective at spurring payment” because they put direct financial pressure on the property owner and the project lender, who usually have the means and motive to resolve the debt. Crucially, a subcontractor’s lien right exists even though the subcontractor has no contract with the owner — it attaches to the property, not to the contractual chain — which is why it partially neutralises Pay-When-Paid Clauses.
Mechanics Lien [supports] Construction Payment Disputes Mechanics Lien [contradicts] Pay-When-Paid Clauses
But the lien is “only as strong as the process behind it”. It is procedurally unforgiving: most states require a preliminary notice early in the project and strict filing deadlines after work ceases; a missed step forfeits the right entirely, dropping the subcontractor back to unsecured-creditor status. States also differ on scope — “full price” states let a subcontractor lien the property for the full value of its work, while “unpaid balance” states cap recovery at what the owner still owes the general contractor. Liens generally cannot attach to public property, so on government projects subcontractors rely instead on payment bonds (e.g. under the federal Miller Act). The mechanics lien is therefore a strong but fragile and uneven substitute for the statutory adjudication regimes of other markets.
Mechanics Lien [relates] Contractor Insolvency and Subcontractor Risk
Connections
- United States — the lien is the core US payment-security tool, source: 2025
- Global Subcontractor Payment Delays — lien pressures owners to pay, source: 2025
- Pay-When-Paid Clauses — lien rights run with the property, not the contract, source: 2025
- Construction Payment Disputes — lien is the leverage in a US payment dispute, source: 2025