Guide
"Respond within 5 minutes" gets repeated everywhere with no number attached. Here's the decay curve turned into pounds and pence, plus a three-tier rule for handling calls you can't take live.
You've seen the line: respond in 5 minutes and you're up to 21 times more likely to qualify the lead than if you wait 30. It's a real pattern — the underlying research on lead response (originally from B2B sales data, later echoed across home services) is consistent about the shape of the curve even if the exact multiple varies by trade and lead source. But "21x more likely" tells you nothing about what's actually at stake for your business. If you run three inbound leads a day, is that £50 a month or £5,000? You need to convert the decay into money before it means anything.
Nobody has a perfect universal number, and anyone who quotes one to the decimal point is guessing. But the shape holds up across plumbing, HVAC, electrical, and cleaning call data: contact and booking rates fall off fast and non-linearly.
| Response time | Approx. contact/booking rate vs. calling within 5 min |
|---|---|
| Under 5 minutes | Baseline (100%) |
| ~30 minutes | Roughly halved (~45-55%) |
| ~1 hour | Falls to roughly 15-25% (an ~80% drop) |
| Over 24 hours | Treat as cold — most have already booked elsewhere |
Why the cliff? Most people calling a plumber, electrician or cleaner at 9am on a leaking pipe or a broken AC are calling two or three businesses at once, or they will the moment your call goes to voicemail. The first one to answer with a real human and a real slot usually wins, not the best quote.
Take a typical small trades business: 3 inbound leads a day, average ticket £420 (labour plus materials, before overhead — if you're unsure what your real ticket is worth after costs, run it through the job profitability calculator first).
Say your current median response time is 42 minutes — realistic if the phone rings while you're up a ladder or under a sink and you call back between jobs. At 42 minutes you're deep into the falloff zone, closer to the 1-hour rate than the 5-minute one. Call it a 30% contact/booking rate compared with what you'd get answering live.
Get that median under 5 minutes (live answer or an instant callback) and you move toward the 90-100% baseline rate. That's the gap worth costing out.
Now, not every one of those extra jobs is a full new customer you'd have lost entirely — some would have called back tomorrow, some were tyre-kickers who'd have gone nowhere anyway. Even discounting heavily, if only 15-20% of that gap converts into genuinely recovered revenue, you're looking at 7-9 extra jobs a month at £420 each: roughly £1,800 to £3,400 a month. That's the number the "21x" stat is actually pointing at, once you attach your own ticket size and lead volume.
Your own figures will differ. Run your missed calls and average job value through the missed call revenue calculator to get a version of this sum with your real numbers, not a generic example.
You can't answer every call live if you're solo and on a roof. But you can build a system that treats speed as a tiered problem, not an all-or-nothing one.
The auto-text is close to free — most job management or CRM tools include it, or a basic SMS automation costs a few pounds a month. An answering service (live human picking up your calls) typically runs £150-£400 a month depending on call volume and hours covered.
Here's the break-even question: how many extra jobs a month does the answering service need to win, over and above what auto-text alone would capture, to pay for itself?
At £420 average ticket and, say, a conservative 35% margin after materials and travel (call it £147 profit per job — check your own number on the job profitability calculator):
If you're currently missing even one call a week outside working hours or while on tools — genuinely missing it, not just delaying the callback — a live answering service likely pays for itself. If your main problem is slow callback during the day rather than missed calls altogether, the free auto-text plus a disciplined callback habit gets you most of the same benefit for near-zero cost. The service is worth it when the alternative is voicemail; it's not worth it if the alternative is a text and a callback in 20 minutes.
None of this works without a habit, not just a tool. Three things move your median response time more than any software:
The 5-minute number isn't a marketing slogan. It's the point on the curve where you're still catching people before they've called the next name on the list. Everything after that is a fight to recover a shrinking share of leads who are already talking to someone else.
The Small Business Operations Kit ($19) turns guides like this one into fill-in-once worksheets: rate card, quoting sheet, job costing, payment terms and follow-up templates. Built by the same people who write these guides.