Preliminary Notice in Construction: What It Is and When a GC Should Act

A preliminary notice, also called a pre-lien notice or prelim, is a written notice a contractor, subcontractor, or supplier sends early in a project to preserve the right to file a mechanics lien if they aren’t paid. In California, it’s a necessary prerequisite to the validity of a lien claim and must be served within 20 days of first furnishing work (Civil Code sections 8200 and 8204). 

For a general contractor, a preliminary notice is an early signal that a lower-tier party has live lien rights, so the GC should log it and confirm a valid lien waiver before releasing payment. Built automates that waiver tracking, and 85%+ of subcontractors adopt it.

What Is a Preliminary Notice in Construction?

A preliminary notice in construction is a written notice sent early in a project that preserves the sender’s right to file a mechanics lien if they go unpaid. Subcontractors, suppliers, and other parties without a direct contract with the owner send it to identify themselves and their scope of work.

The notice doesn’t demand payment or place a lien. It puts the owner, the general contractor, and any construction lender on record that a party is furnishing labor or materials and intends to protect its lien rights. In California, giving this notice is a “necessary prerequisite to the validity of a lien claim,” per California Civil Code section 8200. Skip it, and the downstream lien claim may not hold.

Why Contractors and Suppliers Send Preliminary Notices

Contractors and suppliers send preliminary notices to keep their mechanics lien rights alive. On most projects, the parties doing the work have no direct contract with the property owner, so the notice is how they get on the owner’s radar before any payment dispute starts.

A mechanics lien is a claim against the owner’s property for unpaid work. It’s a powerful remedy, and states protect it by requiring notice up front. Without a valid preliminary notice, a sub or supplier loses much of the pressure that gets them paid.

The notice and the waiver sit at opposite ends of the same right. A preliminary notice preserves the right to file a lien. A lien waiver surrenders that right, usually in exchange for payment. If you’re not sure about the mechanics of releasing that right, our guide to the difference between a lien waiver and a lien release breaks it down.

Preliminary Notice Deadlines and Rules by State

The most common rule is a 20-day deadline. The notice must be served within 20 days of the date the sender first furnished labor or materials. California and Arizona both use this window, but the details differ by state, so treat these as examples, not a national standard.

In California, a claimant must serve the preliminary notice within 20 days of first furnishing work, under California Civil Code section 8204. If you miss that window, the lien rights aren’t erased outright. A late notice limits the claim to work performed within the 20 days before service and afterward, so an early miss shrinks the claim rather than voiding it.

California treats general contractors differently from lower-tier parties. Under California Civil Code section 8200, a claimant with a direct contract with the owner isn’t required to serve the owner, but they must still serve the construction lender, if one exists. That lender qualifier matters, and dropping it is a common mistake.

Arizona uses a similar 20-day notice under Arizona Revised Statutes section 33-992.01, also as a necessary prerequisite to a valid lien claim. The GC exception works differently there. Arizona exempts only people performing actual labor for wages, so original contractors, the parties with a direct owner contract, must serve the notice. A GC that assumes the California carve-out applies in Arizona can lose protection.

Lien statutes vary widely from state to state, and they change. Deadlines, who must be served, and the exact consequences of a late notice all differ. Confirm your obligations against your state’s statute or consult a construction attorney before you rely on any single rule.

When Should a General Contractor Act on a Preliminary Notice?

A general contractor should act the day a preliminary notice arrives. A preliminary notice is your early warning that a lien could land on your owner’s property, and the clock to prevent it starts the day the notice arrives.

As the recipient, you carry the downstream risk. A notice tells you a specific party has live lien rights against the project. Your job is to make sure that party is paid and has signed a valid waiver before those rights turn into a filed lien. The project manager who first sees the notice sets the outcome by what they do next.

Here’s what a general contractor should do with an incoming preliminary notice:

• Log it immediately. Record the sender, the date served, the scope of work, and the tier they sit at.
• Map it to a party you can track. Tie the notice to a subcontractor, supplier, or lower-tier vendor in your payment chain.
• Confirm the payment status. Know what that party is owed and where it sits in your billing cycle.
• Match it to a valid waiver before you release payment. No waiver on file means no clean release.

Consider a $12M mixed-use project with 22 subcontractors. A preliminary notice arrives from a lumber supplier you’ve never contracted with, a second-tier vendor selling to your framing sub. You have no direct relationship with that supplier. The notice means they can lien the owner’s property if your framing sub takes their money and doesn’t pay them. If you release payment to the framing sub without confirming that supplier is covered, you’ve funded the exact gap a lien fills.

How Preliminary Notices Connect to Lien Waivers and Payment

A preliminary notice is the front end of a chain that ends with a signed lien waiver and a clean payment. The notice signals a live lien right. The waiver closes it out. Every notice you log should map to a waiver you collect before or at the moment you release funds.

The waiver type depends on where you are in the payment cycle. At progress billing, subs typically sign a conditional waiver, which takes effect only once payment clears. At final payment, they sign an unconditional waiver, which releases the right outright. Getting the type and timing right protects both the owner and you. Our guide to conditional and unconditional lien waivers covers when to use each one.

On most commercial jobs, the waiver attaches to the pay application, often an AIA G702 and G703 billing package. The pay app states what’s owed, and the waiver confirms the right is released as that amount is paid. When the two travel together, your audit trail stays intact. For a fuller walkthrough of how the documents and the money line up, see how lien waivers and payment connect.

For a Director of Project Controls, closeout is where this discipline pays off. Every preliminary notice on the job should trace to a matching unconditional waiver before final retainage is released. A single unmatched notice at closeout can stall the whole project’s final payment.

How Built Helps GCs Track Notices and Collect Waivers

Built automates your lien waivers and payments so every preliminary notice you log maps to a valid waiver before money moves. Compliance is enforced before payment releases, not chased down after. Manual tracking works until scale breaks it, and a spreadsheet doesn’t flag the notice you forgot to close out.

Built generates waivers from state-statutory templates, tracks compliance across every tier, and gives you visibility into lower-tier parties you don’t contract with directly. Lower-tier vendors don’t need to buy or set up an account. They receive the request, enter their invoice, and sign, so lower-tier adoption isn’t the barrier most GCs expect. In Built Research from April 2025, a survey of 250 US contractors, 70% reported regularly facing delayed payments, the exact friction this workflow removes.

Rod Heisler of Heisler Construction put it directly: “No more chasing down conditional or unconditional waivers after payment. It’s all part of the process in Built. Our subs enter invoices, sign the waiver, and the system handles the rest.” Teams using Built have moved lien waiver processing from 15 to 30 minutes down to under four minutes.

Built is the front door to your ERP. Approved payments and clean waiver records push downstream to your accounting system without double entry. If you already run Procore for field operations, Built adds the financial layer alongside it, so Built and Procore cover the jobsite and the money together. You can also generate a waiver right now with our free lien waiver generator.

Talk to Built About Automating Lien Waivers and Payments

Every preliminary notice on your project is a lien risk waiting for a waiver. Built ties each notice to the right waiver, enforces compliance before payment, and keeps your closeout clean across every tier. See how it works on your next project. Request a demo.

Preliminary Notice FAQs

What is a preliminary notice in construction?

A preliminary notice is a written notice a contractor, subcontractor, or supplier sends early in a project to preserve the right to file a mechanics lien if they go unpaid. It identifies the sender and their scope of work to the owner, the general contractor, and any construction lender. It doesn’t demand payment or file a lien. In California, giving it is a necessary prerequisite to a valid lien claim.

Does a general contractor need to file a preliminary notice in California?

In California, a general contractor with a direct contract with the owner isn’t required to serve the owner, but must still serve the construction lender if one exists. This exception is specific to California. In Arizona, it doesn’t apply, because Arizona exempts only people performing actual labor for wages, so an original contractor there must serve the notice. Confirm your obligation against your state’s statute or a construction attorney.

What is a 20-day preliminary notice?

A 20-day preliminary notice is a notice that must be served within 20 days of the date the sender first furnished labor or materials to the project. California and Arizona both use this window. In California, serving late doesn’t erase lien rights outright. It limits the claim to work performed within the 20 days before the notice was served and afterward.

What should a general contractor do when they receive a preliminary notice?

Act the day it arrives. Log the sender, the date served, and the scope of work, then map the notice to a party in your payment chain. Confirm what that party is owed, and make sure a valid lien waiver is on file before you release payment. Treat the notice as an early warning that a lien could reach the owner’s property, not as someone else’s paperwork.

Is a preliminary notice the same as a lien waiver?

No. A preliminary notice preserves the sender’s right to file a mechanics lien. A lien waiver gives that right up, usually in exchange for payment. They sit at opposite ends of the same right, so a notice you receive should map to a waiver you collect before releasing funds.