What Are Lien Waivers and Why Do You Need Them
A lien waiver is a legal document in which a contractor, subcontractor, or material supplier waives their right to file a mechanics lien against your property for work performed or materials supplied. In California, lien waivers are a critical part of the construction payment process and protect property owners from double payment claims.
Types of Lien Waivers
| Type | When Used | What It Covers |
|---|---|---|
| Conditional Progress | Before a progress payment is received | Waives lien rights for work through a specified date, conditional upon receiving payment |
| Unconditional Progress | After a progress payment is received | Irrevocably waives lien rights for work through a specified date |
| Conditional Final | Before the final payment is received | Waives all remaining lien rights, conditional upon receiving final payment |
| Unconditional Final | After the final payment is received | Irrevocably waives all lien rights for the entire project |
California Lien Waiver Rules
- California Civil Code §8132-8138 provides statutory forms for all four types of lien waivers.
- Only the statutory forms are valid — custom or modified waiver forms may not be enforceable.
- Conditional waivers do not become effective until payment is actually received by the person signing the waiver.
- Unconditional waivers are effective immediately upon signing, regardless of whether payment has been received.
- A waiver cannot be required as a condition for receiving payment that is not yet due.
When to Request Lien Waivers
- Before Each Progress Payment — Request a conditional progress waiver from the contractor (and any subcontractors) before releasing each milestone payment from escrow.
- After Each Payment Clears — Obtain an unconditional progress waiver confirming the payment was received and lien rights for that period are waived.
- At Project Completion — Request conditional final waivers from all parties before releasing the final payment.
- After Final Payment — Collect unconditional final waivers from the general contractor and all subcontractors to close out the project cleanly.
How Bidroom Manages Lien Waivers
Bidroom automates the lien waiver process through the escrow payment system. When a milestone payment is approved, the system automatically generates the appropriate California statutory lien waiver form and sends it to the contractor for digital signature. Signed waivers are stored in the project's document management system and linked to the corresponding payment record. This automated process ensures you never miss a waiver and maintains a complete paper trail for your protection.
Risks of Not Collecting Lien Waivers
Without proper lien waivers, a subcontractor or material supplier who was not paid by the general contractor can file a mechanics lien against your property — even if you already paid the GC for that work. This means you could end up paying twice for the same work. Collecting lien waivers at every payment stage protects you from this risk and is considered a best practice in construction project management.