How to Write a Construction Demand Letter (and When to Send One)

Your first email following up on a past-due payment was friendly. The second included the open invoice again. The third was particularly helpful, asking the GC’s accounting team whether they needed anything else. They finally responded that the check should go out Friday—which then came and went without payment.

At that point, there are only so many ways to write "just checking in" before it stops being a collections strategy.

That’s where a construction demand letter comes in. Sent at the right time and written the right way, it tells the GC this is no longer a routine follow-up. Here's when to send one, what to include, and what to do if the GC still doesn't pay.

What is a construction demand letter?

A construction demand letter is a formal written notice requesting payment of a past-due amount by a specific date.

A demand letter usually sits between routine payment follow-up and whatever formal escalation comes next. Depending on the project, that could be a notice of intent to lien, lien or bond claim, collections referral, or legal action. 

Its primary value is clarity. It captures the amount owed, the deadline, and the next step in writing, giving the GC one clear chance to pay and giving you a documented record if the balance stays open.

When should you send a construction demand letter?

There is no universal timeline for sending a demand letter. Rather, the right timing depends on the contract, the reason for nonpayment, and the project’s deadlines.

Still, it’s usually time to send one when:

• You’ve sent multiple reminders without getting payment or a useful explanation.
• The GC has stopped responding or has repeatedly missed promised payment dates.
• The invoice has reached your internal escalation point.
• You have ruled out an ordinary billing issue.

That last point is worth a closer look. Before escalating, rule out the common causes of construction payment delays and make sure the invoice is not stuck because of a missing waiver, expired compliance document, rejected pay app, incomplete backup, or unresolved change order. A demand letter will not fix a document nobody uploaded.

While you’re at it, check the mechanic’s lien requirements and deadlines in your state if you're on a private project, or your payment bond claim deadlines if the project is public or bonded.

Demand Letter vs. Notice of Intent to Lien (NOI)

Keep in mind that a demand letter isn't the same as a notice of intent to lien (NOI). A demand letter is a business request to the GC, with no required format or timing. An NOI is a statutory notice, often sent to the property owner. 

In some states, you have to send an NOI before you can file a lien, and it comes with its own deadline and delivery rules. A demand letter generally won't satisfy that requirement or stop the clock, so keep those deadlines on a separate track while payment conversations continue.

What’s included in a construction demand letter?

A strong demand letter keeps things straightforward and typically includes these eight elements:

1. Your Information and the Paying Party's Information

Put the letter on your company letterhead, and include the date, your company’s legal name, address, and contact information. You should also include the recipient's legal company name and address, and direct it to the person who handles payment or formal notices.

Your contract may provide some of this information, so check it before you send.

2. The Project and Contract

Name the project, include the property’s legal address (also in your contract), and reference the contract or subcontract by number or date, along with its payment terms. 

3. The Exact Amount Owed

State the exact amount owed and show how you got there: the relevant pay app or invoice number(s), the amounts billed, contractual due dates, and any payments or credits received. Include retainage only if it's billable and due, and add interest, penalties, or fees only when the contract or applicable law supports them. If you reference a prompt payment law, confirm that it applies to your project and contractual tier.

And attach copies of the unpaid pay apps and any backup you reference, so the recipient doesn't have to hunt for them.

4. A Clear Record of the Work and Prior Follow-Up

Briefly describe the labor, materials, or services you provided, then summarize prior collection attempts and missed payment promises. Keep the history useful: include the dates and commitments that matter, then move on.

5. A Firm Payment Deadline

Use an exact calendar date, not “as soon as possible” or “within 10 days.” “Payment must be received by October 15, 2026” leaves little room for interpretation.

A date seven to 14 days out is often practical, but the contract, applicable law, or approaching lien and bond deadlines may require something different.

6. A Clear Next Step

Tell the GC what you may do if payment doesn't arrive by the deadline. That might be an NOI, a mechanic's lien, a bond claim, a collections referral, or some other legal action. State it factually, and don’t promise an action you don’t intend to take.

Language like this keeps the point clear:

"If payment is not received by [date], we may pursue the rights and remedies available under our contract and applicable law, which may include a mechanic's lien or payment bond claim, where available, and legal action."

7. The Right Tone

Keep the tone professional and even. Accusations, sarcasm, inflated legal language, and threats won't get you paid any faster, and you may work with this GC again. An owner, surety, attorney, or judge could eventually read the letter, too.

Let the specifics carry the weight instead. "The balance of $84,250 for Pay Applications 07 and 08 was due on August 31, 2026" does more work than three paragraphs about how disappointed you are.

The good news is you don't have to start from scratch. Download Siteline's free construction demand letter template, then customize it for the project, contract, and payment at issue.

How do you send a construction demand letter?

Check whether your contract requires a specific delivery method or notice address. If it does, follow those instructions exactly.

If it doesn’t, use certified mail with a return receipt or a courier with signature confirmation, and email a PDF as well. Keep the signed letter, attachments, mailing receipt, delivery confirmation, and email. A letter you can’t prove was delivered won’t do much for your record later.

And what happens after you send it?

A demand letter usually produces one of four outcomes:

1. You get paid. Confirm that the funds clear, apply the payment correctly, and provide the appropriate lien waiver.
2. The GC proposes a plan or another date. Put it in writing, assign someone to monitor it, and keep tracking lien or bond deadlines. A new promise does not extend them.
3. The GC disputes the balance. Ask for the exact amount and reason. “Accounting has an issue with it” is not enough to solve anything. Assign the issue to the right owner (A/R, the PM, compliance, leadership, or counsel) with a next action and date.
4. The GC stays silent. Follow the escalation plan outlined in the letter. Another open-ended reminder only turns your firm deadline into another date in the email chain.

If the amount is substantial, the work is disputed, or a legal deadline is close, it may be a good idea to bring in a construction attorney before you take the next step.

How do you make demand letters part of your collections process?

Demand letters have a bad habit of becoming 6:00 PM projects, with someone digging through three inboxes to reconstruct what happened. Your team should already know when the invoice was due, what the GC promised, which reminders went out, what may be blocking payment, and which deadlines are approaching.

That’s the idea behind Siteline's Collections workspace. Teams can prioritize open invoices, compare the GC's expected payment date with Siteline's predicted date, and automate personalized follow-up. Payment status, notes, reminders, and ownership remain connected to the receivable.

When risk rises, Lien Rights Management keeps state-specific deadlines and lien status visible alongside collections, so the team does not wait past the point when leverage disappears.

With all that history in one place, your team can promptly send the letter and know exactly what needs to happen if the deadline keeps getting pushed out. No inbox archaeology required.

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Frequently Asked Questions

Is a demand letter legally binding?

Usually not by itself. A demand letter documents the request and deadline, but it doesn’t carry the force of a court judgment. Depending on the contract or applicable law, it may satisfy a notice requirement, trigger a cure period, or lead to a binding payment plan or settlement.

Can a subcontractor send a demand letter without an attorney?

Generally, yes. Consider attorney review when the amount is substantial or disputed, a lien deadline is close, the GC alleges defective work, or you’re demanding statutory interest, penalties, or attorney’s fees.

How should you send a construction demand letter?

Follow any delivery requirements in your contract. If there aren't any, use certified mail with a return receipt or a courier with signature confirmation, and email a PDF as well. Keep copies of everything, including proof of delivery.

How long should you give a GC to respond to a demand letter?

There is no universal period. Seven to 14 days is often practical, but use a specific date and account for the contract and approaching lien or bond deadlines.

What happens if a GC ignores a demand letter?

Follow through on the next step you named in the letter, such as a notice of intent to lien, filing a lien or bond claim, referring the account to a collections agency, or bringing in an attorney to pursue arbitration or litigation. Do not assume the letter preserves those options or extends their deadlines.

Please note: This article provides general educational information and is not legal advice. Demand letter, lien, and bond requirements vary by state, contract, project type, and role. Consult a qualified construction attorney about your specific situation.