Conditional vs. Unconditional Lien Waiver: What's the Difference?
The difference between a conditional and an unconditional lien waiver comes down to one thing: timing of when you actually give up your lien rights. Getting this wrong can cost you the ability to collect if a payment fails.
Conditional = safe for the sub
A conditional lien waiver is only effective when the payment actually clears. You sign it to release the lien on the condition that you get paid. If the check bounces or the wire never arrives, your lien rights remain fully intact. This is the safe waiver to provide when you're billing for a draw but haven't confirmed the money yet.
Unconditional = gives up rights immediately
An unconditional lien waiver gives up your lien rights the moment you sign — no strings attached. If you sign one and the payment later fails, you may have no lien remedy left. Only sign an unconditional waiver after you've confirmed the funds have actually landed in your account.
Comparison table
| Conditional | Unconditional | |
|---|---|---|
| Takes effect | Only when payment clears | Immediately on signing |
| Risk to sub/supplier | Low — rights survive a failed payment | High — rights gone even if check bounces |
| When to sign | Before payment is confirmed | After funds are received |
When to use each
The standard workflow: provide a conditional waiver when you submit your invoice or draw, then provide the matching unconditional waiver once the payment clears. This applies to both progress and final payments — see our guide on partial vs. final waivers for that distinction, or start with what a lien waiver is.
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