Notice of Intent to Lien Requirements for Subcontractors: A State-by-State Guide

If you're a subcontractor dealing with an unpaid invoice and you’ve exhausted your A/R escalation strategies, filing a mechanic's lien may be your strongest tool for recovering what you're owed. But in 12 states, you can't simply file liens when payment disputes arise; you first must send a notice of intent to lien (NOI).

Missing this step, or sending it late, can weaken or eliminate your lien rights, depending on the state. This guide breaks down which states require subcontractors to submit an NOI, the deadlines you need to meet, and what's at stake if you don't.

What Is a Notice of Intent to Lien?

A notice of intent to lien (NOI) is a formal written warning sent to the property owner (and sometimes the general contractor or lender) stating that you intend to file a mechanic's lien if you aren't paid. Think of it as a final demand before escalating to an actual lien filing.

It's important not to confuse an NOI with a preliminary notice. While they sound similar, they serve very different purposes:

The Proactive Prelim

You send a preliminary notice proactively, typically at the start of a project or within a set number of days after you begin furnishing labor or materials. It alerts the property owner and general contractor (GC) that you're on the job and protects your right to lien later, if needed. In most states that require them, failure to send a preliminary notice means forfeiting your lien rights.

The Down-the-Line NOI

An NOI comes later, after a payment dispute surfaces. It's a warning shot, giving the property owner or GC one last chance to resolve the outstanding balance before you proceed with filing. In states that require it, the NOI is a mandatory prerequisite to filing the lien itself.

One critical point: sending an NOI does not extend your lien filing deadline. If your state gives you 90 days from last furnishing to file a lien and requires a 10-day NOI, you effectively need to send the notice by day 80 at the latest—so plan accordingly.

Which States Require a Notice of Intent to Lien?

The following 12 states require subcontractors to send NOIs before they can file valid mechanic's liens. The specific deadlines, delivery methods, and consequences vary significantly between states.

Alabama

• Deadline: While there’s no specific number of days before filing, subs must send the NOI before recording the lien and within the four-month lien-filing window after last furnishing or work performed.
• Who sends it: All parties without a direct contract with the property owner, including subcontractors and suppliers. GCs are exempt.
• Who receives it: The property owner.
• Notable rules: Alabama refers to a  NOI as a "Notice of Unpaid Balance." While there is no state-mandated form, the notice must comply with Ala. Code § 35-11-218 and be in writing. It must include:
  
  • a statement that you’re claiming a lien,
  • the amount due,
  • what the amount is for (e.g., labor, materials, or services), and
  • the party responsible for the debt. 

While the statute doesn’t explicitly require a description of the property or project, it’s always a good idea to include it.

• What's at stake: Subcontractors who fail to send this notice cannot file a valid lien. Additionally, since most subcontractors in Alabama are limited to an "unpaid balance lien" (capped at whatever the owner still owes the GC at the time the notice is served), sending the NOI earlier protects a larger recoverable amount. Wait too long, and the owner may have already paid the GC fully, leaving nothing for your lien to attach to.

Learn more about mechanic’s lien rights in Alabama. 

Arkansas

• Deadline: At least 10 days before filing the lien.
• Who sends it: All parties—GCs, subcontractors, and suppliers alike.
• Who receives it: The property owner.
• Notable rules: Arkansas requires an NOI on all private project types. Separate from an NOI, commercial subcontractors must also send a preliminary Notice to Owner and Contractor within 75 days of last furnishing. 
• What's at stake: Failing to send the NOI at least 10 days before filing invalidates the lien. Since the lien deadline is 120 days, the effective NOI deadline is day 110, but waiting that long is risky.

Learn more about mechanic’s lien rights in Arkansas.

Colorado

• Deadline: At least 10 days before filing the lien.
• Who sends it: All parties, including GCs, subcontractors, and suppliers.
• Who receives it: Whichever party you’re in direct contract with (property owner or GC).
• Notable rules: Colorado's statute (§ 38-22-109(3)) does not define specific content for the NOI, but it’s best to include all the information that will appear on the lien claim, such as property description, claimant and owner names, amount due, and the party you contracted with. You can prepare and send the NOI and the lien statement together, as long as the lien isn't recorded for at least 10 days after the NOI is served. This is helpful since Colorado also requires every lien filing include a notarized affidavit proving the NOI was served.
• What's at stake: Filing a lien without first serving the NOI renders the lien invalid. For subcontractors, the lien filing deadline in Colorado is generally four months after the date of last furnishing or work performed.

‍Learn more about mechanic’s lien rights in Colorado.

Connecticut

• Deadline: Within 90 days of last furnishing labor or materials, but within 15 days before filing a lien. (Both NOI submission and lien filing windows run on the same timeline.)
• Who sends it: All lien claimants who do not have a direct contract with the property owner, including subcontractors, suppliers, and equipment lessors. GCs are exempt.
• Who receives it: The property owner. If the GC filed an affidavit with the town clerk within 15 days of starting work, the notice must also go to the GC.
• Notable rules: Connecticut has unusually strict service requirements for an NOI. If the property owner (or GC, if required) resides in the same town as the project, the notice must be served in person by a state marshal or other "indifferent person" (not the claimant). If the recipient is out of town, certified or registered mail is acceptable. If the mail is returned unclaimed, the notice must be published in the relevant town’s newspaper. Each property owner must be served individually—even spouses at the same address.
• What's at stake: Without a valid NOI, subcontractors cannot file a mechanic's lien at all. Because the NOI and lien share the same 90-day window, Connecticut is a state where you need to start the process early.

Learn more about mechanic’s lien rights in Connecticut.

Illinois

• Deadline: Within 90 days after last furnishing labor or materials.
• Who sends it: Any party hired by someone other than the property owner, such as subcontractors, suppliers, and laborers. 
• Who receives it: The property owner (or their agent) and the construction lender, if known.
• Notable rules: Illinois requires the notice be sent by registered or certified mail (return receipt requested), or personal service see 770 ILCS 60/24). It must be delivered to the property owner (or their agent), and include the amount due (or to become due), the hiring party, work/materials provided, and the property identification. There is an exception: if the GC's sworn statement already includes the subcontractor's claim, a separate NOI may not be necessary. However, relying on this can be risky, as you can't always confirm what the GC submitted.
• What's at stake: A subcontractor who fails to send the NOI within 90 days loses the right to file a mechanic's lien entirely. Since the lien filing deadline in Illinois is four months from the last date of work, the NOI deadline comes up fast, and can easily get overlooked.

Learn more about mechanic’s lien rights in Illinois.

Maryland

• Deadline: Within 120 days after the last furnishing of labor or materials.
• Who sends it: All subcontractors and suppliers who did not contract directly with the property owner. GCs and those with a direct owner contract are exempt.
• Who receives it: The property owner.
• Notable rules: Governed by MD Real Property Code § 9-104, NOIs must be verified under oath and follow a statutory format. It needs to identify the subcontractor, describe the work or materials provided, and state both the total amount earned and the amount still unpaid. The notice must be served by registered or certified mail (return receipt requested) or personal delivery. Maryland explicitly excludes single-family owner-occupied dwellings from the NOI requirement.
• What's at stake: Subcontractors who fail to send the notice within 120 days of last furnishing lose their lien rights. 

Learn more about mechanic’s lien rights in Maryland.

Missouri

• Deadline: At least 10 days before filing the lien.
• Who sends it: All subcontractors, suppliers, and laborers. GCs are exempt (but must provide their own separate notice before receiving any payment).
• Who receives it: The property owner.
• Notable rules: Missouri requires an itemized account for subcontractors filing a lien (not just a lump sum), and the NOI should describe the amount due and who owes it. On residential owner-occupied projects, there's another layer: subcontractors need written consent from the property owner (obtained through the GC) to have lien rights at all. Missouri’s lien filing deadline is six months from the last date of last furnishing.
• What's at stake: Filing a lien without first sending the 10-day NOI renders the lien invalid.

Learn more about mechanic’s lien rights in Missouri.

Nevada

• Deadline: At least 15 days before filing the lien.
• Who sends it: All parties (except laborers) on residential projects. The NOI is not required on commercial projects.
• Who receives it: The property owner.
• Notable rules: Nevada's NOI requirement is unique because it only applies to residential projects. The notice must follow a statutory format (see Nevada Revised Statutes § 108.226) and include substantially the same information as the lien claim, such as the contract amount, payments received, amount due, and property details. Serving the NOI also extends the lien filing deadline by 15 days. Since Nevada’s lien filing deadline is 90 days from completion or cessation of work, a properly served NOI can extend the window to 105 days.
• What's at stake: On residential projects, failing to send the NOI means you cannot file a valid lien. 

Learn more about mechanic’s lien rights in Nevada.

North Dakota

• Deadline: At least 10 days before filing the lien.
• Who sends it: All parties filing a lien.
• Who receives it: The property owner.
• Notable rules: North Dakota keeps things relatively straightforward. The NOI must be sent by certified mail at least 10 days before recording the lien (see N.D.C.C. § 35-27-02(4)). The lien filing deadline is three months from the date of last furnishing, effectively making day 80 the practical NOI deadline.
• What's at stake: A lien filed without the required 10-day advance notice is invalid.

Learn more about mechanic’s lien rights in North Dakota.

Pennsylvania

• Deadline: At least 30 days before filing the lien.
• Who sends it: All subcontractors (and most suppliers) filing a lien on a project are required to send an NOI. GCs are exempt.
• Who receives it: The property owner.
• Notable rules: In Pennsylvania, subcontractors are required to submit a Notice of Intent to File a Lien by certified mail with return receipt requested. Per Pennsylvania Mechanics' Lien Law § 501(b.1) and § 501(c), the NOI must include the claimant’s name, the name of the party that hired them, the amount claimed, the general nature of the labor or materials furnished, the date of completion, and a brief description of the property.
• What's at stake: Filing a lien without submitting the 30-day NOI can invalidate the claim.

Learn more about mechanic’s lien rights in Pennsylvania.

Wisconsin

• Deadline: At least 30 days before filing the lien.
• Who sends it: All parties—GCs, subcontractors, and suppliers.
• Who receives it: The property owner.
• Notable rules: In Wisconsin, the Notice of Intention to Claim a Lien must be delivered either personally, by registered or certified mail, or by any other method that provides written confirmation that delivery was received (see Wis. Stat. § 779.06(2)). Wisconsin also has a separate preliminary notice requirement: subcontractors and suppliers on owner-occupied residential projects (four units or fewer) must send a notice within 60 days of first furnishing. 
• What's at stake: Failing to send the required NOI will invalidate the lien.

Learn more about mechanic’s lien rights in Wisconsin.

Wyoming

• Deadline: At least 20 days before filing the lien.
• Who must send it: All parties—GCs, subcontractors, and suppliers.
• Who receives it: The property owner (each owner individually if there are multiple).
• Notable rules: Wyoming requires a Notice of Intent to File Lien to be sent by certified mail (return receipt requested) and to substantially follow the statutory form outlined in Wyo. Stat. § 29-10-102. The notice must include key details such as the amount claimed, the party who owes the payment, and a statement that a lien will be filed if payment isn’t made. Wyoming’s lien filing deadline for subcontractors is 120 days from last furnishing, making the day 100 the practical NOI deadline.
• What's at stake: A mechanic's lien filed without the 20-day notice is invalid and unenforceable.

Learn more about mechanic’s lien rights in Wyoming.

NOI Requirements at a Glance

How do subcontractors solve for missed deadlines?

If there's one takeaway from this breakdown, it's that NOI deadlines are strict, and the consequences of missing them are severe. In nearly every state that requires an NOI, failure to send it on time results in forfeiture of your lien rights. And because the NOI doesn't pause or extend your lien filing clock (with the narrow exception of Nevada), the real filing window is shorter than it looks.

The challenge for subcontractors managing dozens of projects across multiple states is keeping track of all these moving parts. That's where Siteline's lien rights management capabilities help. 

Siteline:

• tracks your notice deadlines on a project-by-project basis, 
• alerts you when action is required, and 
• helps you stay on top of the state-specific requirements that keep your lien rights intact.

Instead of maintaining spreadsheets or relying on memory, you get a centralized system that flags upcoming deadlines before it's too late.

When payment disputes arise, you need your lien rights and supporting documentation in order. Get a demo of Siteline to see how we help protect your right to get paid on every project.

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Disclaimer: This article is for informational purposes only and does not constitute legal advice. Lien laws vary by state and are subject to change. Consult a construction attorney licensed in your state for advice specific to your situation.