Sell an AI phone receptionist to tradespeople who miss calls
"Ring this number and pretend your boiler's broken." That one demo sells it. Set up a voice agent that answers when the trade can't, takes the job and texts it over within a minute, and sends gas leaks, carbon monoxide and danger to life straight to the right emergency line, every time.
- The business: a cost calculator with per-call maths, a one-page offer, an intake form, outreach scripts that respect PECR, a weekly routine and a scoreboard
- Python 3 for the simulator (standard library only, nothing to install). Level 0 covers getting set up: Install anything from GitHub, safely
- For live clients: accounts on one voice platform (Vapi, Retell or Bland) and Twilio, each with a card and a spending limit. Learning and the simulator cost nothing
- n8n somewhere the internet can reach it, for the texts: Run n8n 24/7 on a £5 server
- A password manager for API keys and client logins. KeePassXC is free
- The kit: download it all as a zip or read the kit overview
- About 2.5 hours to read and simulate, then around 8 hours a week finding clients
Check the gap is real: the missed-call audit
Don't sell a statistic. Sell the trade's own missed calls back to them.
Here's the gap. Tradespeople work with their hands, on ladders, in lofts and under floors. Their phone rings in a van or a pocket and they can't pick up. In a Fix Radio survey of over 220 tradespeople ↗ (October 2022), 60% said they struggled to answer the phone at work and 34% believed they'd lost work because they couldn't. That's the most direct UK trade figure there is, and the audit below turns it into the trade's own number.
You'll see bigger numbers everywhere: "62% of calls go unanswered", "80% of callers won't leave a voicemail", "missed calls cost trades £24,000 a year". Most trace back to small US studies, vendor blogs that quote each other, or a sum that assumes one lost £450 job every day. Don't put them in your pitch. A sharp plumber will ask where they came from, and you'll lose the room.
What a missed call can be worthMost are worth low hundreds, a few are worth thousands, and some are worth nothing:
- Emergency plumbing: about £75 call-out, with a typical repair around £135 to £255 (MyJobQuote ↗).
- Locksmith: £60 to £150 for a daytime call-out outside London, £120 to £200 out of hours (Fantastic Services 2026 guide ↗).
- Electrician: call-out £60 to £120, same-day emergency £120 to £350, a consumer unit £450 to £750 outside London (Fantastic Services 2026 guide ↗).
- Roofer: an average repair around £650, ranging from £150 to £3,000+ (MyJobQuote ↗).
- Worth nothing: suppliers, existing customers who'll ring back, spam, and "have you got a minute to talk about your Google listing".
So the pitch isn't "each missed call is £1,000". It's "one or two extra jobs a month pays for this, and here's how many you actually missed".
The missed-call auditBefore you sell anything, ask the trade to spend two weeks filling in missed-call-audit.csv from their phone's call log: each missed call, whether the number was known, whether they left a voicemail, whether the trade rang back and reached them, and what happened. Ten minutes a week. At the end you both know: "14 missed, 9 unknown numbers, reached 4 on callback, 2 had already booked someone else." That's a number they produced, about their own business. Nobody argues with it.
Tip- What it takes. Once you've done one, a set-up takes most of a day. The real work is in four places.
- Trust: trades hear from lead-gen firms every week, so you win them with the demo number and their own audit, not a pitch.
- Safety: a voice agent answering a plumber's phone *will* get a gas smell call one day, so the safety lines are signed off and tested every time.
- Speech: postcodes, accents and noisy streets are why the flow reads everything back.
- Your value: DIY products exist, so you sell the set-up, the safety work and the monthly upkeep. Plan for a few weeks of steady calls and walk-ins before your first paying client, and start with trades you already know.
- Who this suits: you'll answer your own phone when a client needs a fix, and you're happy to hold the line on no quoting, even when a client asks for it.
Good fitssole traders and small firms (1 to 5 people) in plumbing and heating, electrical, locksmithing, roofing, drainage and glazing, with a mobile on their van and their website, who get most new work by phone. Poor fits: firms with an office manager answering all day, trades booked out for months who don't want more calls, and anyone who won't let callers be told it's automated.