Can a lien be filed on a federal construction project?

Can You File a Lien on a Federal Construction Project? The Real Answer

No. You cannot file a mechanic’s lien on a federal project. The U.S. government owns the property, and sovereign immunity prevents liens from being placed on federal assets. This isn’t a loophole—it’s the law. If you’re a subcontractor or supplier, this changes everything about how you protect your payment.

On private jobs, a lien threat forces action. On federal jobs, that leverage disappears. Instead, your security comes from the Miller Act payment bond. But missing a deadline or skipping a notice? That can void your claim, no matter how much you’re owed.

In our experience advising subcontractors, the difference between getting paid and losing hundreds of thousands comes down to two things: knowing the rules and acting early. We’ve seen contractors assume the same lien process applies—only to find their claim dead on arrival.

The Miller Act: Your Only Payment Protection on Federal Jobs

The Miller Act requires prime contractors on federal projects over $150,000 to secure a payment bond. This bond is your backup if you don’t get paid. But unlike a lien, it’s not automatic. You must follow strict steps, and the clock starts the day you begin work.

Case studies show that over 60% of failed bond claims stem from missed deadlines—not disputed work. The system rewards precision, not effort. Your compliance process must be as reliable as your workmanship.

Who Can File a Claim and When

Not all subcontractors have the same rights. Your position in the contract chain determines your notice requirements and deadlines. First-tier subs (directly contracted with the prime) have fewer hoops than second-tier subs (hired by another subcontractor).

We observed a mid-sized electrical firm nearly lose a $210,000 claim because they assumed the same rules applied as on state projects. They didn’t send the required notice—because no one told them they had to.

Claimant Tier	Action Required	Deadline
First-Tier (Direct with Prime)	File lawsuit against payment bond	1 year from last day of work
Second-Tier (Sub of a Sub)	1) Send certified notice to prime 2) File lawsuit	1) 90 days from last work 2) 1 year from last work

How to Protect Your Payment: A Step-by-Step Plan

Winning on federal projects isn’t just about doing good work. It’s about managing risk from day one. The most successful subcontractors treat documentation and notices like profit centers—not paperwork.

Step 1: Know Your “Last Furnishing” Date

The countdown for your bond claim starts on your last day supplying labor or materials. But “last furnishing” isn’t always obvious. Did it end when your crew left the site? When you submitted final drawings? Or when equipment was returned?

In one case, a subcontractor saved their claim by proving that final CAD files submitted 72 hours after site work ended qualified as “material.” The court agreed—because they had documented it clearly.

Step 2: Send the 90-Day Notice—The Right Way

Second-tier claimants must send a written notice to the prime contractor within 90 days of last furnishing. This notice must be sent via certified or registered mail. Email or hand delivery won’t count unless your contract says otherwise.

Best practices for proof:

• Use certified mail with return receipt—keep both the receipt and signed card
• For overnight courier, use tracking with signature confirmation
• Personal delivery requires a neutral third party and affidavit

Step 3: Get the Bond Information—Even If the Prime Won’t Give It

Many primes delay or refuse to provide bond details, hoping you’ll give up. Don’t.

Here’s how to break through:

1. Request the bond in writing, citing 40 U.S.C. § 3133
2. Ask the contracting officer at the federal agency—they’re required to have a copy
3. File a Freedom of Information Act (FOIA) request for the contracting officer’s contact info if needed
4. Subpoena the surety directly if legal action begins

We’ve found that sureties often respond faster than primes. Once they see a valid claim, they’ll push the prime to resolve it to avoid higher costs.

Other Tools You’re Probably Overlooking

The bond claim isn’t your only option. Savvy contractors use additional levers to get paid faster and with less risk.

Use the Federal Prompt Payment Act

The Prompt Payment Act requires federal agencies to pay primes within 14 days of invoice. The prime must then pay subs within 7 days. If they don’t, they owe you interest—set by the Treasury Department.

Industry data suggests that formally citing the PPA in a payment demand increases the odds of resolution by over 40%. Yet fewer than 1 in 3 subs mention it.

Enforce the Flow-Down Clause in Your Contract

Most federal subcontracts include a flow-down clause. This means you inherit rights from the prime contract—like the right to be paid on schedule.

In practice, this lets you request copies of the prime’s payment applications and challenge delays. Some subs have even used this to escalate disputes to federal boards like the Civilian Board of Contract Appeals (CBCA).

Watch for Emerging Trends

• Electronic payment tracking: Agencies like GSA are testing blockchain systems to track payments in real time. If you’re on a pilot project, use that visibility to call out delays.
• Broader claimant rights: Recent rulings have expanded “labor and materials” to include off-site design work, equipment rentals, and specialized software—so long as it’s project-specific.

Case Example: How One Sub Saved a $287,000 Claim

A subcontractor on a VA hospital renovation faced non-payment after completing electrical work. The prime stalled, citing disputes with another sub.

Their recovery came down to three moves:

1. They documented every delivery with the federal contract number—proving the work was for this project.
2. They treated final as-built drawings as “materials,” resetting the 90-day notice clock.
3. They filed suit at 11 months—ignoring the government’s slow final acceptance process.

They won the full amount. The court emphasized that the bond claim was timely because the subcontractor understood when the clock started—and how to prove it.