AI for Contractors: What It Handles in a Sub's Day
A lot of the talk about AI in construction is about estimating software and takeoffs. That's not where a sub loses the day. The hours go to the small stuff: texting customers back, writing up quotes, chasing receipts, emailing the GC. That's exactly the work AI on your phone is good at. Here's what it handles, hour by hour.
What AI handles in a sub's day
Before the crew rolls
- Overnight messages. Paste in the texts and emails that came in, and get short draft replies to read and send.
- Today's plan. Turn last night's voice note into a crew text: who's where, what to bring, what the GC is expecting.
On the job
- GC updates. Photos plus a voice note become a clean progress email or daily log entry.
- Extra work. When the GC or homeowner asks for something new, draft the change order before you start it, not after.
Between jobs
- Quotes. You set the price. AI writes the scope, the inclusions and exclusions, and the terms so the quote looks like it came from a company with an office.
- Supplier pricing. Turn your takeoff notes into a clean email asking two suppliers for pricing on the same list.
End of the day
- Invoices. Bill the day the work is done with a contractor invoice template and a voice note.
- Receipts. Snap the day's receipts and get a list your bookkeeper can use, sorted by job.
Once a week
- Follow-ups. Open quotes, unpaid invoices and unsigned change orders, each with a short, polite nudge.
- Insurance. When a GC asks for a new certificate, AI writes the request to your agent. See what a GC checks on your certificate of insurance.
Three prompts to start with
These work in ChatGPT, Claude, Copilot or Gemini. Use the voice button and talk instead of typing.
Reply to a customer text
I'm a [trade] contractor. A customer sent the message below. Draft a short, friendly text reply I can send from my phone. Answer their question if my notes cover it. If they want a time, offer [two time windows]. If they're asking about price, say I'll confirm after I look at it and give a day I'll get back to them. Under 60 words. No emojis. Their message: [paste] My notes: [what I know, or "nothing yet"]
Quote from your walkthrough notes
I'm a [trade] contractor writing a quote for [customer] at [address]. Turn my notes into a one-page quote. Include: a plain scope of work, what's included and what's not, my price of $[price] broken out as [labor / materials, or a single number], how long the quote is good for [days], payment terms [terms], and a line to sign and accept. Use only my price. Don't add work I didn't mention. List anything unclear as a question at the top. My notes: [walkthrough notes or voice memo]
Receipts into a list for your bookkeeper
Here are photos of receipts from today. For each one, give me a row with: date, vendor, total, what it was for, and which job it belongs to based on my notes. Put it in a table I can paste into a spreadsheet for my bookkeeper. If you can't read a number, write "check" instead of guessing. Today's jobs: [job names] Notes: [which purchases went to which job, if you know]
What AI should not do
- Set your prices. It doesn't know your costs, your crew or your market. You give it the number.
- Send anything on its own. Read every draft before it goes out. You're responsible for what it says.
- See private data. Never paste in bank details, card numbers or Social Security numbers.
- Replace the phone call. When a customer or GC is upset, call them. Use AI for the follow-up email that confirms what you agreed.
Where to start
Pick the one task that eats your evenings, usually invoices or quotes, and use AI for only that for two weeks. Once it sticks, add the next one. The AI adoption playbook covers how to roll it out to a whole team.
Where to start
Money Audit
One recent job, every invoice, change order and payment tied to the bank. See what you're still owed.
See the Money AuditFree Paperwork Pack
Ten copy-and-paste AI prompts for change orders, pay apps, insurance certificates and GC replies.
Get the packTyler Alexander is the founder of Cranes Consulting and co-owner of Alexander² Construction, a general contractor in Tampa and Naples. He teaches subcontractors and small businesses to use AI to cut office time.