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For plumbers & heating engineers

Boiler Replacement Quote Template (UK) with Worked Example

A boiler swap is the job customers compare hardest, usually against two or three other quotes. The one that wins is rarely the cheapest. It's the one that shows exactly what's included, line by line, so the price makes sense.

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Rough notes in, finished quote out. 2 free goes.

Worked example

The notes

Mrs J Ainsley, Sunderland: “Swap old combi for a 30kW combi, new flue, powerflush 8 rads, magnetic filter, 2 days, me and my lad.”

ItemQtyUnit priceTotal
30kW combi boiler, supplied and fitted1 each£1,300.00£1,300.00
Flue kit and fittings1 set£185.00£185.00
Powerflush, 8 radiators1 job£320.00£320.00
Magnetic system filter1 each£120.00£120.00
Labour, 2 engineers × 2 days4 days£170.00£680.00
Subtotal
£2,605.00
VAT at 20%
£521.00
Total
£3,126.00

Example prices for illustration only. Your prices depend on your area, the spec and access, so set your own.

Turn your own notes into a quote like this

Type the job how you'd say it. Workscribe lays it out, prices each line and works out the VAT. Free to try, no account.

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What a boiler replacement quote should include

  • Boiler make, model and output, so the customer can compare like for like
  • Flue type and position, and any changes to it
  • System clean: powerflush or chemical flush, plus inhibitor
  • Filter, controls and any thermostat upgrade
  • Gas Safe registration and Building Regulations notification
  • Manufacturer warranty length and what it depends on (annual service, registration)

Common mistakes

One price, no breakdown

"£2,800 all in" looks like a guess. Itemise the boiler, flue, flush, filter and labour so the number feels earned.

Forgetting the flue and condensate

Flue extensions, plume kits and condensate routes are where boiler jobs go over. Price them, or say clearly what's excluded.

Questions

Should a boiler quote include VAT?

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If you're VAT registered, show the net price, the VAT and the total separately. If you're not registered, say so on the quote so the customer isn't surprised.

How long should a boiler quote be valid for?

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30 days is common. Boiler prices move, so a validity date protects you if the customer comes back months later.

Do I need to mention Gas Safe on the quote?

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It's good practice to include your Gas Safe registration number. It builds trust and customers increasingly check it.

General guidance, not legal or technical advice. Check current regulations for your job.

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