How to quote over the phone without undercharging
Some jobs deserve a number from the first call. Some deserve “I'll confirm on site.” Mixing those up is how a busy week turns into working for fuel money.
Updated 31 July 2026
Quote on the phone for like-for-like, well-described jobs such as a standard lock change, a known boiler service, a clear tap swap, or a priced call-out. Insist on a visit or photos with caveats for anything behind tiles, under floors, rewires, roofs, or vague heating faults. Ask postcode, access, exact symptom, make or model, what they tried, and budget before you give a figure. Put the same caveat in a text.
An electrician takes a call about a “quick outside socket.” Quotes £120 from the van. On site: no spare way in the board, outdoor cable run through a conservatory roof, customer assumed a fused spur and a fancy IP-rated unit. The £120 was never the job. The questions below are there so you find that out at 40mph, not on your knees in their flowerbed.
Which jobs can you quote over the phone?
Usually fine from a good call
- Like-for-like boiler service (make/model known, no fault reported)
- Standard lock change on a common night latch or euro cylinder (brand/size confirmed)
- Simple tap swap where they already know the fitting type
- Call-out + first-hour diagnostic for an emergency (price the attendance, not the unknown repair)
Needs eyes on (or photos + caveats)
- Anything behind tiles, under floors, or in a loft you have never seen
- Rewires, consumer unit upgrades, full bathroom refits
- Roof work from a vague “few slipped tiles”
- “How much to sort my heating?” with no make, age, or fault code
What should you ask before giving a phone quote?
Postcode and parking
Travel time and congestion charge / parking reality.
Property type and access
Flat vs house, landlord vs owner, keys with a neighbour.
Exact symptom
“No hot water” is not the same job as “no heating” or “leak under the bath”.
Age / make / model if relevant
Boiler, cylinder, fuse board, lock type. Photo of the data plate beats a guess.
What they already tried
Reset, pressure top-up, new batteries in the thermostat. Saves a wasted visit speech.
Budget expectation
If they want a £200 bathroom, say so early. Kindness is cheaper than a site visit for a tyre-kicker.
For urgent vs routine wording across trades, see emergency call intake questions.
How do you protect a phone quote with caveats?
Ballpark
“From what you’ve said, jobs like this are usually in the £X–£Y range if nothing odd turns up on site. I confirm a firm price once I’ve seen it.”
Fixed from the call
“If it’s a straight swap of [item] as described, that’s £X including VAT and fitting. If we open it up and find [common surprise], I’ll stop and agree extras before I carry on.”
Attendance only
“Tonight’s call-out is £X for the first hour. Parts and further labour are on top once we know what’s wrong.”
Then put the same words in a text. Phone numbers fade; a message thread does not. If you take a deposit to hold the diary, read deposits and cancellations before you invent a policy on the fly.
Get the facts even when you can't answer
The checklist above only runs if someone asks the questions. Graftline can take the call in your business name, gather job, postcode and urgency, and send you the card on WhatsApp so your callback is a quote, not a fishing expedition.
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Quoting questions
Should I give prices inclusive of VAT?
If you are VAT-registered, quote VAT-inclusive to domestic customers unless they clearly want a breakdown. People compare the number they hear on the phone to the number on the next firm’s website.
What if they push for a fixed price on a mystery fault?
Refuse politely. Price the diagnosis. Mystery faults sold as fixed prices are how you fund someone else’s boiler with your margin.
Is a phone quote a contract?
It can form part of one, especially if they accept and book. Follow up in writing (text or email) with the figure, what’s included, and your cancellation terms. See the deposits guide for cooling-off notes on distance contracts.
How do I stop racing to the bottom on price?
Ask the questions above before you give a number. Callers who will not answer basic access or symptom questions are rarely your best customers. Speed of answer still matters; being first and clear beats being first and cheap.