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For plumbers & heating engineers

Back Boiler to Combi Conversion Quote Template (UK)

Back boiler removals are bigger jobs than a straight swap: the old boiler, cylinder and tank come out, pipework changes, and there's often a fireplace to make good. A clear quote stops the "I thought that was included" conversation.

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

Worked example

The notes

Mr & Mrs Doyle, Gateshead: “Remove back boiler + fire, cylinder and loft tanks, fit 30kW combi in kitchen, new gas run, cap off, 3 days.”

ItemQtyUnit priceTotal
30kW combi boiler, supplied and fitted1 each£1,300.00£1,300.00
Remove back boiler, fire, cylinder and loft tanks1 job£450.00£450.00
New gas supply run to kitchen1 job£280.00£280.00
Pipework alterations and condensate1 job£340.00£340.00
Flue kit and fittings1 set£185.00£185.00
Labour, 3 days3 days£340.00£1,020.00
Subtotal
£3,575.00
VAT at 20%
£715.00
Total
£4,290.00

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 back boiler to combi conversion quote should include

  • Removal and disposal of the back boiler, fire, cylinder and tanks
  • New boiler position and gas run route
  • Capping and making safe old pipework
  • Whether making good the fireplace is included
  • Powerflush or clean of the existing system
  • Building Regulations notification through Gas Safe

Common mistakes

Leaving out the making good

The hole where the fire was is the first thing the customer notices. Say whether you're boarding it, or whether it's for their decorator.

Under-pricing removal

Getting a cylinder and tanks out of a loft takes time. Price removal as its own line, not hidden in labour.

Questions

How long does a back boiler to combi conversion take?

+

Usually two to four days depending on the new boiler position and how much pipework changes. Put your estimate on the quote.

Should I quote for a powerflush?

+

Old open-vented systems are often full of sludge. Many installers include a flush so the new boiler's warranty isn't put at risk; quote it as a separate line either way.

What should be excluded?

+

Common exclusions are decorating, plastering and any work found to be needed once floors are up. Listing them protects you.

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

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