AI for plumbers and electricians: 7 prompts for the phone, from $11 a month

What AI tool can help plumbers and electricians most?

A general chat app (GPT, Claude or Gemini) at $11 to $20 a month is the AI tool that helps a self-employed plumber or electrician most, because the work it removes is the writing: quotes, customer texts, invoice chasers, review replies and job ads. A field-service suite does the scheduling and the invoicing instead, and its paid plans cost one person $29 to $79 a month where a price is published at all. I priced six suites on 27 September 2026: ServiceM8 has a free tier capped at 30 jobs, and two of the six, ServiceTitan and Workiz, show no number and send you to a sales call.

The table is the same check in full: US dollars, monthly billing for one user, read on 27 September 2026. The last column is the thing only the suite does, which is the reason to pay for one.

Read the two halves of that table as two different purchases. The suites sell a calendar, an invoice that tracks itself and a phone that gets answered; every one of them also bundles some AI writing, and ServiceM8 gives it away on the free tier. The chat apps sell the writing alone, and they do it from a phone microphone with no setup, which is why a one-van business that already invoices from a bank app or a spreadsheet gets most of the value for the smaller number. Whizi loses here on scheduling and on invoicing: it has neither, so it writes the quote and the reminder and something else has to send and track them. What it offers instead is GPT and Claude Haiku on Starter at $15.99 a month ($10.99 billed yearly), Claude Sonnet and Gemini on Pro, and photos and PDFs in the same chat, which matters for the spec-sheet job below.

The rest of this page is the seven prompts, written for a phone. How to use AI in everyday life covers the home half of the same phone; AI for small business owners covers bookkeeping and marketing.

How do you write a quote, a running-late text and an invoice chaser from the van?

Dictate the job notes into the chat app, paste the prompt around them, and send. The three prompts below cover the three messages a self-employed tradesperson sends most, and each one caps the length and limits the apology to one, which are the two edits a raw draft usually needs.

Prompt 1, the quote: "I am a licensed [plumber/electrician] in [city]. Turn these job notes into a customer quote with a one-line job title, a scope of work in plain words, a materials line, a labour line, a total, what is not included, and a 30-day validity. No adjectives, no sales language, under 150 words. Notes: [dictate the notes]." Keep your own prices in the notes; the model does not know your rates or your local material costs, and a quote it prices for you is a guess dressed as a number. How to write a quote for a job covers the structure and the deposit line.

Prompt 2, the running-late text: "Write a text under 40 words to a customer telling them I am running 45 minutes late for a 2 pm appointment. Apologise once, give the new arrival time, offer to rebook if that does not suit. No exclamation marks." Forty words reads in one glance from a lock screen.

Prompt 3, the invoice chaser: "Write a friendly text under 60 words chasing invoice [number] for $[amount], due [date], now 14 days overdue. This is the first reminder, so assume they forgot. Include the line: pay here [link]. End with my name and trading name." Send the same prompt a fortnight later with "this is the second reminder, be direct, no apology" and the tone shifts on its own. How to ask for payment politely has the escalation ladder from first nudge to final notice.

The prompts do more work here than the model choice. Send the 40-word texts to the cheapest tier you have, and switch to a flagship for the quote when the notes run long or messy.

Which AI is best for electricians reading a spec sheet or a code question?

For a spec sheet, any model that takes a photo or a PDF is good enough, and GPT, Claude and Gemini all do; the prompt decides whether the answer is usable. For a code question, no chatbot is the authority. The adopted edition, the local amendments and the inspector are, and a model that recites a clause from memory may be reciting an edition your jurisdiction never adopted.

The spread is real. As of 6 July 2026, ElectricalToolbox's adoption tracker counted 7 states enforcing the 2026 National Electrical Code, 35 on the 2023 edition, 6 on 2020, 1 on 2017 and 1 on 2014, with one state on its own code, and it adds that "Statewide adoption does not prevent local amendments, and adoption dates shift on each state's rulemaking cycle." Plumbing is split the same way between the two model codes, the IPC and the UPC, and then amended city by city. The US Bureau of Labor Statistics puts the licensing side in one line: "Most states require electricians to pass a test and be licensed. Requirements vary by state."

Prompt 4, the spec sheet: attach the photo of the data plate or the manufacturer PDF and send "From this sheet only, tell me the maximum overcurrent protection, the minimum conductor size, the required clearances and the voltage and phase. Quote the exact line each figure comes from. If a figure is not on the sheet, write not stated; do not fill it in from general knowledge." The last sentence is the whole prompt. Check that every figure in the answer carries its quoted line; a figure with no line quoted did not come from the sheet, so look it up on the sheet yourself.

Prompt 5, the code question: "Explain what [NEC 210.8(A)] requires, in plain words, for a residential job. Name the edition you are quoting and say what changed in the edition before it. List what a state or local amendment could change. I will check the adopted edition for [city, state] and confirm with the inspector before I rely on this." That framing turns the model into a reading aid for the code book, which is what it is good at, and keeps the decision where the permit says it belongs. Do not ask it whether your installation passes; that is the inspection, and it needs the drawings, the site and the person who signs.

Can AI reply to a Google review and write a job ad without sounding like a bot?

Yes, when the prompt bans the two things Google itself warns against, length and selling. Google's own guidance for owners reads: "Keep it short and simple: Customers value direct and honest responses." and "Be conversational, not promotional: Your reviewers are already customers, so avoid using your response to offer deals or promotions." Google also says a reply "will be publicly posted under the customer's review", so every reply is marketing copy whether you meant it that way or not.

Prompt 6, the review reply: "Reply to this Google review in under 50 words. Use the reviewer's first name, name the specific job they mention, thank them once, no offers, no exclamation marks, no corporate phrases. Review: [paste]." For a one-star review add: "Do not argue with the facts. Say what I will do about it and give one way to reach me directly." AI response to a bad review has seven worked examples of that second case.

Prompt 7, the job ad: "Write a 120-word job ad for a [journeyman electrician] in [city]. Pay is $[low] to $[high] an hour, [benefits], [licence] required, [van/tools provided]. Say what a typical week looks like in two sentences. No buzzwords, no exclamation marks. Applications by text to [number]." Putting the pay range in the ad is the line that changes who applies, so keep it in the prompt and check it survived in the draft.

Can AI take over plumbers and electricians?

No, on the US government's own projections. The Bureau of Labor Statistics projects electrician employment to grow 9 percent from 2025 to 2035 and plumbers, pipefitters and steamfitters 7 percent, both "much faster than the average for all occupations", from 821,000 and 510,600 jobs in 2025. Median pay was $63,190 for electricians and $63,800 for plumbers in May 2025. The same tables say 7 percent of electricians and 8 percent of plumbers are self-employed, which is who this page is for.

The decision rule, then. With one van and no office, an $11 to $20 chat app plus ServiceM8's free tier at 30 jobs a month covers the paperwork for under $20. The day a second van needs dispatching, or you miss the fourth call in a week, is the day the $49 to $79 suite earns its price, and the chat app keeps writing the words inside it.