Lien waiver in construction

In every U.S. state, contractors and suppliers have a statutory right to file a mechanic's lien against a property if they aren't paid for work or materials. The lien attaches to the property title and can prevent sale or refinancing until resolved. It's a powerful collection tool — and a significant risk for owners and lenders.

A lien waiver is the contractor's signed release of that lien right, exchanged for payment. Owners and lenders typically require a lien waiver from every contractor and supplier with every payment, to ensure the chain of payments is documented and lien rights are released as work proceeds.

Lien waivers come in a 2×2 matrix: conditional vs unconditional, and partial vs final.

1. Conditional Partial Waiver. Signed at the time of payment request. Releases lien rights for the work covered, but only conditional on the payment actually clearing. The most owner-friendly version to give and the safest version for a contractor to sign — the waiver only takes effect if the check clears.

2. Unconditional Partial Waiver. Signed after payment is received. Permanently releases lien rights for the amount paid. A contractor should never sign one of these until the funds have cleared.

3. Conditional Final Waiver. Signed at the time of final payment request, conditional on the final payment clearing. Releases all remaining lien rights.

4. Unconditional Final Waiver. Signed after final payment has cleared. Releases all lien rights on the project permanently.

The right sequence on every draw: collect a Conditional Partial Waiver with the payment application. After the payment clears, collect an Unconditional Partial Waiver for that amount. Repeat each draw. At final payment, switch to the Final waivers.

Lien waiver forms and rules vary by state. About a dozen states (including California, Texas, Florida, Georgia, Arizona, Missouri, Nevada, Wyoming, Utah, and others) have statutory lien waiver forms that must be used — anything else is unenforceable. Other states permit any reasonable form.

Notice deadlines and lien-filing windows also vary. Some states require preliminary notices (like California's 20-day preliminary notice) before a lien can be filed at all. Builders working across state lines should verify the rules in every state they operate in. AIA's G706 Contractor's Affidavit of Payment of Debts and Claims is a related document — a contractor's sworn statement that all sub debts have been paid — often required at final completion alongside final lien waivers.

1. Missing waivers from lower-tier suppliers. Many GCs collect waivers from direct subs but not from those subs' suppliers (the lower-tier vendors who could also file liens). This is a major risk on bigger projects.

2. Wrong waiver type signed at the wrong time. Contractors who sign unconditional partial waivers before payment clears expose themselves to losing lien rights on payments that never arrive. Lenders requesting unconditional waivers before payment is a red flag.

3. Amount mismatches. The waiver should cover the exact dollar amount being paid. Common error: collecting a $40K waiver while paying $42K — the $2K is unreleased and can still trigger a lien.

4. Outdated state forms. States revise statutory forms periodically; using a 2018 California form in 2026 may not be enforceable.

Ella reads every lien waiver that arrives, matches it to the corresponding payment, validates the dollar amount, checks the waiver type (conditional vs unconditional, partial vs final) against the payment status, and tracks whether the waiver is on the correct state-specific form. Any payment going out without a matching waiver is flagged. Any waiver that doesn't match the payment amount is flagged. The result: no payment leaves your account without a valid waiver on file.