Somewhere in your truck or your inbox is an invoice for a commercial job you wrapped back in the spring. The general contractor's been friendly about it every time you call. "It's in the next draw," he says. "Owner's slow to fund." You've heard that line before, so you give it another couple weeks.
Here's what the friendly tone can hide. In Texas, if you're a subcontractor or a supplier on a commercial or new-construction job, your right to file a lien and actually force payment runs on a monthly clock. Miss the deadline to send one notice letter and that right doesn't just weaken. It's gone, and the slow-paying GC knows it.
The deadline is easy to blow because nothing warns you. No email, no reminder, no angry phone call. The month just ends, and a few months later a window quietly closes. A simple tracker, the kind you can set up in a spreadsheet or have an AI assistant watch for you, keeps that from happening.
The deadline, in plain terms
Texas gives subs and suppliers a monthly notice deadline to protect what the law calls a derivative lien claim, meaning your claim flows through the contractor above you. On commercial and new-construction work, the rule most crews run into is this: for labor or materials you furnished in a given month, you generally have to send written notice by the 15th day of the third month after that month.
Count it out with a real example. Say your crew worked a job in March. March is month one, April is two, May is three. Your notice needs to be in the mail by May 15th. Work spread across March and April? You may owe a separate notice for each month, each on its own third-month clock.
That notice goes by certified mail, return receipt requested, to the property owner and usually the original contractor too. It names the amount you're owed and the job it's for. Send it in time and you keep your lien rights alive. Send it late, even by a day, and for that month's work you've likely lost them.
One honest caveat: the exact deadlines and who gets the letter depend on your role, the contract date, and whether the job is residential or commercial. (Residential runs on a shorter clock.) Rule changes that took effect a few years back adjusted some of the timing, so before you lean on any tracker, have a Texas construction attorney confirm the rule for the kind of work you do. Set it up once with a lawyer, then let the system run it.
Why a slow GC counts on you missing it
Not every late payment is a scheme. Draws really do move slow, and most GCs pay eventually. But some learn that a sub who's heads-down on the next job isn't watching the calendar, and a lien right that expires costs them nothing.
Think about how it looks from their side. Every month you don't send notice, your leverage drops. Once the deadline passes, you're just another unsecured vendor hoping to get paid out of goodwill. The GC who was vague on the phone in April is a lot harder to reach in June.
The notice is cheap insurance against that. A few dollars in certified mail keeps you near the front of the line instead of the back, and more often than not the letter itself shakes the check loose. Owners don't love lien paperwork landing on a project they're still trying to finance.
Build a tracker that watches the clock for you
You don't need software built for the construction trades to do this. You need one list of your open commercial invoices and a column that does the date math. Here's the backbone of it:
- Job and GC name, so you know whose draw you're chasing.
- Month the work was performed, not the invoice date. The clock runs off when you furnished labor or materials.
- Amount still unpaid, updated when partial payments land.
- Notice deadline, calculated as the 15th of the third month after the work month.
- Status: paid, notice sent, or deadline approaching.
Once the deadline column exists, the useful part is the flag. Have the sheet or an AI assistant check the list every morning and surface anything unpaid with a deadline inside the next three weeks or so. That buffer gives you time to confirm the numbers and get the letter in the mail without a last-minute scramble.
Keep the flag loud and simple. A short daily message to whoever handles your billing beats a color-coded tab nobody opens. Something like: "Two jobs need a lien notice before the 15th. Acme plaza, $8,400. Westside warehouse, $3,100." That reads like a dispatcher's reminder, not a report.
Let it draft the letter, then you sign it
The notice letter follows the same shape every time, which is exactly the kind of chore AI handles well. Once a job trips the flag, an assistant can pull the job name, the owner and GC addresses, the unpaid amount, and the month of work, and drop them into a notice letter your attorney approved as a template.
What you get back is a ready-to-mail draft with the addresses confirmed and the certified-mail slip filled in. You read it, check the dollar figure against your records, sign, and send. The slow part, the staring at a blank page trying to remember the right language, is gone.
Keep in mind what that draft is and isn't. It's a filled-in form, not legal advice. The template's wording, the recipients, and the deadline all have to come from your attorney first.
Where the computer helps, and where it doesn't
AI is good at the parts that are boring and exact: watching dates, doing the month math, flagging what's due, and filling a known template with the right names and numbers. That covers most of what trips crews up, because the failure here is almost never the letter. It's forgetting to send one.
What it can't do is tell you whether you even have a valid claim, who legally counts as the owner on a given project, or how an unusual contract changes your deadline. Those are judgment calls, and they belong to a construction attorney. Treat the tracker as the thing that makes sure you never miss the window, not the thing that decides where the window is.
Garbage in matters too. If the work month in your sheet is wrong, the deadline it calculates is wrong, and a confident wrong date is worse than none at all. Enter the month the work actually happened, and spot-check the first few deadlines by hand until you trust the math.
Worth doing this week
You don't have to automate the whole thing to stop losing lien rights. Start with the list.
- Pull every open commercial and new-construction invoice and write down, for each, the month the work was actually performed.
- Count three months forward from that month and mark the 15th. That's your notice deadline. Flag anything due in the next 30 days right now.
- Call a Texas construction attorney, confirm the rule for your work, and get one approved notice-letter template you can reuse.
- Set one daily reminder, a spreadsheet alert or a short message, that lists any unpaid job whose deadline is coming up.
- Send this month's notices by certified mail, return receipt, before the 15th. Then do it again next month.
Set up right, this is fifteen minutes a month that keeps a friendly "next draw" from quietly turning into money you'll never see. If you'd rather hand the watching and drafting to a system that runs on its own, that's the kind of small, specific automation we build for Houston shops at AI Agency Houston. Either way, the part that matters is that something, or someone, is counting to the 15th.