When a Customer Won't Pay

Customer non-payment usually falls into three buckets: the customer can't pay, forgot the invoice, or is unhappy with the work. Each needs a different response, and a two-minute phone call tells you which one you're dealing with. Escalating the wrong one costs you the money and the customer.

After discussing an unpaid contractor invoice by phone, move the payment conversation to text or email. Confirm phone calls in writing afterward:

Dave — following up on our call just now. Confirming you'll send $2,400 on invoice #1042 by Friday the 14th. Let me know if anything changes.

• Day 1 past due: friendly reminder text.
• Day 7: firmer message with a named date.
• Day 14: phone call, then a written summary of that call.
• Day 30: formal written demand.
• Day 45+: lien, collections, or small claims.

Following an overdue-invoice reminder schedule keeps you calm and builds a record that reads well if this ends up in front of a judge.

Dear Dave Mercer, This is a formal demand for payment of $2,400 for work completed at 118 Oak St on August 14, 2026, billed on invoice #1042 and now more than 30 days past due. Please remit payment in full by September 30, 2026. If payment is not received by that date, I will pursue the remedies available to me, which may include a mechanic's lien and a claim in small claims court. I would prefer to resolve this directly. You can reach me at (555) 013-2288. Sincerely, Mike Alvarez, Ridgeline Home Repair

Send the payment demand letter by email and by certified mail, and keep the mailing receipt. A written demand is often the step that gets a check moving.

Mechanic's lien rules are state-specific and strictly deadlined — some states require a preliminary notice within weeks of starting the job, and missing a filing window can end your claim. Small claims courts have dollar caps that also vary by state. Check your own state's rules or talk to an attorney before relying on either. This guide is general information, not legal advice.

• Take a deposit and bill in draws on bigger jobs.
• Get the estimate accepted in writing before you start.
• Document every change with a change order — unpaid extras are the most common fight.
• Do a written walkthrough and closeout with a project completion letter.
• Put late fees in your terms and actually apply them.

Collecting an unpaid contractor invoice is easier if you already have job records. For each job, keep in one place: the signed estimate or contract, any change orders, before-and-after photos, the invoice, and every reminder you sent with its date. If you end up in small claims court, this file is your case.

How much can I claim in small claims court? Every state sets its own limit, and they vary a lot. Check your state or county court website for the current limit and filing fee before you file.

Can I put a lien on the house? Many states allow mechanic's liens for unpaid construction work, but the rules are strict: some require a notice before you start work, and filing deadlines can be short. Look up your state's rules or talk to a local attorney early.

Should I use a collections agency? Collections agencies typically keep a percentage of the debt they recover, so they make the most sense for larger debts you've stopped expecting to collect yourself.

Can I take back materials I installed? Generally, no — removing installed work can create legal trouble for you. Use the written steps, small claims, or a lien instead.

• Don't post about the customer on social media — it can expose you to legal claims and hurts your reputation.
• Don't show up at their home or work unannounced to demand money.
• Don't threaten action you won't actually take.
• Don't let months pass — deadlines for liens and claims keep running while you wait.
• Don't keep doing new work for a customer who owes you on the last job.

Staying calm and professional at every step makes you look better to a judge, a mediator, and future customers.

For an unpaid contractor invoice, a rough follow-up timeline is: friendly reminders in the first two weeks, a phone call around week three, a written final notice around day 30, and a demand letter shortly after. If nothing changes, decide on small claims or a lien before any state deadline passes. Write each date down when you send the invoice so you follow the plan instead of waiting and hoping.