Preliminary Notice vs. Notice of Intent to Lien: What Subcontractors Need to Know

Sometimes subcontractors need legal protection to ensure they get paid for their work. That’s where a mechanic’s lien comes in. Filing a mechanic’s lien is a multi-step process involving two other documents that are often confused—preliminary notices and notices of intent to lien. 

If you’re new to the world of lien rights, this article will answer any questions you have about a preliminary notice vs. a notice of intent to lien. It covers:

• The definitions and differences of each
• When each should be used
• State requirements for both types of notices
• Information to include in your notices
• Best practices for managing notices across projects

What's the difference between a preliminary notice and a notice of intent (NOI) to lien?

Both documents are part of the pre-lien process and contain similar information, but they serve different purposes at different stages of a project.

Preliminary Notice

A preliminary notice (a.k.a. notice to the owner or notice of furnishing) is a legal notice that informs the property owner, GC, and other parties with a financial interest in the property, that:

1. you’re involved in the project, and 
2. you have a right to file a lien if you’re not paid for your services.

Notice of Intent to Lien (NOI)

A notice of intent to lien (a.k.a. intent notice or notice of non-payment) is a warning that you intend to place a lien on a property if you don’t receive payment within a specific number of days.

The simplest way to think about it: a preliminary notice secures your right to payment. A notice of intent demands it.

When should you send a preliminary notice or a NOI?

The two documents play different roles in the lien timeline, and the stakes are high for both.

• Send a preliminary notice at the start of a project. In states that require it, you typically have 20 to 60 days from when you first furnish labor or materials. Miss that window and you can lose your lien rights entirely. Even in states where it isn't required, sending one is a widely recommended best practice. It formally puts the owner and GC on notice that you're on the job, and creates a paper trail if payment issues come up later.‍
• Send a notice of intent when invoices are overdue and you’re preparing to file. An NOI is your last warning before submitting a lien claim. Similar to preliminary notices, every state requires one, but it's worth sending regardless—owners and GCs often respond faster once a lien filing is formally on the table, which means you may never have to file at all. In states that do require it, make sure you send it within the mandated window before filing, or you risk losing your right to lien.

Which states require a preliminary notice or a notice of intent?

As extensions of mechanic’s liens, preliminary notices and notices of intent only apply to private construction projects. Everything else pertaining to notice requirements varies significantly by state. 

The table below breaks down which states require commercial subcontractors to submit a preliminary notice or a NOI. For the full picture on your state—including filing deadlines and any form-specific requirements—visit our state-by-state mechanic's lien rights guides.

What information must preliminary notice and NOI letters include? 

Some states have specific verbiage that you must add to your preliminary notice and NOI letters. In general, you want to include the following information.

Preliminary Notice:

• Your name, address, and phone number
• Name, address, and phone of the company that hired you
• The full property address
• Description of your scope of work
• Name, address, and phone number of the GC, property owner, and lender (if applicable)
• Signature

Notice of Intent:

• Your name, address, and phone number
• Name, address, and phone of the party you’re demanding payment from
• The full property address
• Description of services provided
• Total amount owed
• Number of days before you intend to file a lien
• Signature

What best practices can subs use to manage preliminary notices and notices of intent?

With so many state-specific rules, managing these notices can seem like a lot. Here are a few best practices that can make the process easier. 

• Send notices by default. Make preliminary notices a standard part of your project kickoff, regardless of whether your state requires one. The earlier you send it, the more seriously owners and GCs take your payment expectations. It also creates documentation you'll be glad to have if a dispute surfaces later.
• Know your state's rules before work starts. Requirements vary not just by state, but sometimes by project size, project type, and your tier in the contract chain. Some states require notices to be filed with a county clerk or state registry rather than sent directly to a party. Others mandate a specific delivery method, like certified or registered mail.
• Double-check required content before sending. In many states, a notice can be challenged or invalidated if it contains errors, like wrong property description, incorrect owner name, or a misstated last furnishing date. If your state requires a specific form, use it. And keep a copy of every notice you send.
• Track notice deadlines in your A/R workflow. An NOI is only useful if you send it in time—before your lien rights expire. Build notice windows into your collections process so you know exactly when to escalate from invoice reminders to a formal notice, without losing leverage. Tools like Siteline can track state-specific lien deadlines and send notices directly from your billing workflow, so nothing falls through the cracks on a busy project.

If you’re curious to learn more about Siteline’s mechanic’s lien rights features—and how they help to protect your hard-earned payments from start to finish—schedule a quick time to chat here.