Conditional vs Unconditional Lien Waivers
A conditional lien waiver gives up the signer's lien rights only once the payment it names has actually been received, while an unconditional lien waiver gives them up the moment it's signed, whether or not the money arrived. Contractors and suppliers send the conditional version to get paid and the unconditional one after the payment clears.
A painting subcontractor sends a conditional waiver for $9,600 with its May bill and signs an unconditional waiver for the same $9,600 once the general contractor's bank has paid the $9,600 check.
Conditional vs unconditional at a glance
A lien waiver is a signed statement that gives up the right to put a lien on a property for the payment and work it covers. Subcontractors (subs) sign them when the general contractor (GC) pays, and suppliers sign them when the subs pay. Conditional and unconditional waivers differ on one question: when the rights are given up.
| Conditional waiver | Unconditional waiver | |
|---|---|---|
| Takes effect | When the named payment is received (in Arizona, for a check, when the bank it's drawn on pays it) | As soon as it's signed |
| When it's sent | With the bill, before payment | After the money has cleared, often with the next bill |
| Who carries the risk | The payer, until there's proof of payment | The signer, if the payment fails |
Each type comes in a progress version, for a payment partway through the job, and a final version, for the last payment.
How a conditional lien waiver works
Lien waiver rules are state law, so the forms and their effect differ from state to state. We use Arizona's forms as the example here, and a construction attorney can confirm what your state requires.
A conditional waiver is a promise with a trigger. The sub signs it before it's paid, and it only takes effect when the payment arrives. Arizona's statutory form, in A.R.S. 33-1008, spells out the trigger for a check: the document becomes effective once the check "has been properly endorsed and has been paid by the bank on which it is drawn." If the payment never comes, the waiver never takes effect, so a sub gives up nothing it hasn't been paid for.
For the payer, that's also the weakness. A conditional waiver alone doesn't prove you paid. Arizona's form tells anyone relying on it to verify evidence of payment first, and the statute accepts either the signer's endorsement on a check the bank has paid or the signer's written acknowledgment of payment.
Read what a progress waiver leaves out, too. Arizona's progress forms don't cover any retention (Arizona's word for retainage, money kept back until the job is finished), pending changes, or anything furnished after the through date, the last day of work covered. So in Arizona, a progress waiver doesn't release extra work still waiting on an approved change order.
Florida's statutory progress form carves out only retention and work after the through date. Check your state's form before you sign, and ask an attorney how to protect pending extra work if it has no line for it.
How an unconditional lien waiver works
An unconditional waiver is a statement of fact: the signer has been paid. There's no condition left to fail, so it takes effect the moment it's signed. That's why payers prefer it. An owner, a lender or a title company can rely on it without asking for bank records.
Arizona requires the unconditional forms to carry a notice in type at least as large as anything else on the page. It reads, in part: "This document waives rights unconditionally and states that you have been paid for giving up those rights. This document is enforceable against you if you sign it, even if you have not been paid. If you have not been paid, use a conditional release form."
Sign the conditional when you're asking for money. Sign the unconditional when the money is yours.
Timeline: one payment from conditional to unconditional
An electrical sub on a medical office build-out, in a state using forms like Arizona's, bills $30,000 for June work. The GC holds 10% retainage, $3,000, so the payment due is $27,000. Here's that one payment:
| Date | What happens | Status of the June waiver |
|---|---|---|
| July 1 | Sub submits pay app 3 (its third monthly pay application, the bill for work done) with a conditional progress waiver for $27,000, work through June 30 | Signed, not yet effective |
| July 20 | GC's $27,000 check arrives and the sub deposits it | Not effective until the GC's bank pays the check |
| July 22 | Sub's bank shows the funds as available | That doesn't show whether the GC's bank has paid |
| July 24 | Sub confirms with its bank that the check was paid and not returned | Already effective, from the day the GC's bank paid the check |
| August 3 | Sub sends pay app 4 with an unconditional progress waiver for $27,000 through June 30 | GC has the unconditional waiver on file |
From July 1 until the GC's bank pays the check, the GC holds a waiver that hasn't taken effect, and nothing in its file shows when that changed. From August 3, it holds the sub's statement that it was paid, which it can pass to the owner with its paperwork for the June draw (the owner's scheduled payout for that month).
Neither June waiver covers the $3,000 of retainage. The sub hasn't waived its rights to that money, but they last only as long as it meets its state's notice and lien filing deadlines.
The risk of signing an unconditional waiver too early
Rewind to July 22. The deposit shows as available, the GC's project manager is asking for the unconditional waiver, and the sub signs it to be helpful. On July 23 the check comes back unpaid. The sub has now given up its lien rights, and under forms like Arizona's its payment bond rights too (the right to claim against a bond that guarantees subs get paid), for $27,000 it never received.
"Available" and "paid" aren't the same. The Federal Reserve's compliance guide to Regulation CC, the federal rule on check holds and returns, describes the risk to a bank "that a check will be returned after funds have been made available for withdrawal." If that happens, your bank can generally take the credit back even if you've spent it, under UCC 4-214, part of a model code each state adopts in its own version.
The federal guide treats a return as prompt if the check gets back to your bank within two business days after reaching the paying bank, so give it a few days.
Two habits keep subs out of trouble:
- Sign an unconditional waiver only for money already in your account, and for a check, only once the bank it's drawn on has paid it.
- If a payer insists on an unconditional waiver before paying, offer a conditional waiver now and a written acknowledgment the day the money clears.
Florida handles this without a separate conditional form. Section 713.20 of the 2026 Florida Statutes lets a lienor (anyone with lien rights) who signs a waiver in exchange for a check condition it on payment of the check. If it goes unpaid and no payment bond protects the owner, the owner can hold that amount back from the GC until it's paid. A Florida waiver that isn't substantially similar to the statutory forms is still enforceable on its own terms, so read any broader form before you sign.
How final waivers differ
Final waivers are broad. A conditional final waiver goes out with the last bill, which usually includes the retainage held over the job. The unconditional final waiver then ends the signer's lien rights on the project, apart from any exception the form allows. Arizona's unconditional final form releases everything "except for disputed claims for extra work in the amount of" a figure the signer fills in.
That blank matters. If the electrician from the timeline still has a $4,200 change order in dispute at closeout, the end of the job when the last paperwork and payments are settled, it writes $4,200 there. Florida's statutory final form has no such line, so ask an attorney before signing one with a dispute open.
Which waiver to ask for, and when
If you're the payer, ask for the conditional waiver with each bill, pay, and then ask for the unconditional waiver for that payment with the next bill. If your subcontract allows it, hold the next payment until the last unconditional arrives.
If you pay subs through Clyr's bill pay and accounts payable, each bill goes out by ACH or by mailed check. Knowing which one a sub got tells you when the money should have landed, and so when to start asking about a late unconditional waiver.
FAQs
It takes effect on its own once the condition is met, at least under forms like Arizona's. But nothing in your file shows that it happened. The payer still needs proof, either an unconditional waiver for the same payment or evidence such as the sub's endorsement on the cleared check.
A conditional waiver for $27,000 is waiting on a $27,000 payment, so a $20,000 check may not trigger it. Don't sign an unconditional waiver for the full amount, and be careful with a partial one: a form that releases all work through June 30 can release the unpaid $7,000 too. Use a through date the $20,000 actually covers, or list the $7,000 as an exception, and have a construction attorney check the wording.
A joint check is made out to two payees, usually a sub and its supplier, and both must endorse it. The supplier signs a conditional waiver for its share before the check is issued and an unconditional one once the check is paid. Arizona's statute counts the claimant's endorsement on a single or joint payee check, paid by the bank, as evidence of payment.
Usually not. Each progress waiver should match one payment and one through date, so a missed or partial payment is easy to spot. A blanket waiver covering future work is a bad idea and is unenforceable in some states. Florida, for example, allows lien rights to be waived only for labor, services or materials already furnished.
