A lien waiver is a legal document that removes a party’s right to file a mechanics lien for work, materials, or services they have provided. There are two common types: conditional and unconditional. A conditional lien waiver takes effect only when a payment clears or is deposited; if the check bounces, the waiver is void and the lien rights are restored. An unconditional waiver is final when signed; the signer has already been paid or has accepted the risk of non-payment.
Lenders require lien waivers from the general contractor and all major subs and suppliers before releasing the final payment (and sometimes before releasing holdback at substantial completion). Without lien waivers, the property could have hidden lien claims that cloud the title even after the builder has paid everyone. The standard lien-waiver forms vary by state and are often sourced from AIA or construction legal templates. Getting subs and suppliers to sign lien waivers can be administratively complex, especially on larger projects with many vendors, but it’s non-negotiable for most construction lenders. Builders and contractors should understand the difference between conditional and unconditional waivers and ensure they collect the right type at each milestone.