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Boiler Fitting Cost; How Much Of A Boiler Replacement Price Is Labour?

Welcome to our quick-fire guide covering boiler fitting costs. In this guide, we’ll not talk about the overall cost of replacement (although we have a guide to full boiler replacement costs here), but labour only.

If you’ve already started getting boiler replacement quotes, there’s a good chance that not one is the same.

Different boiler fitters will quote different prices. Some of that difference is going to be the type of boiler they choose to fit (for instance, a low-end boiler could be £500, whereas another might be £1,000 or more).

But, other differences in the cost to fit a new boiler are going to come down to the cost of materials, and what materials are actually used.

As an example, not ALL boiler fitters will install a magnetic system filter. These filters stop your boiler from getting clogged with heating sludge and are a worthy investment. Depending on the filter and including the labour cost of installation, a quote with a filter compared with one without, could be £200-250 more.

How Much Does It Cost To Fit A Boiler (Labour Only)?

Expect to pay labour costs of £350-750 for boiler fitting. This includes copper pipe and fittings for a basic installation in the same location, but doesn’t include a filter, or the boiler itself. There may be additional expense involved if you wish to move your boiler, and we’ve explained the expected cost to move a boiler here.

On average, we’d expect the price for fitting a boiler to make up around £500 worth of a quotation. The other costs associated with the quote might be the boiler, flue, magnetic system filter, limescale filter and more.

To get a fixed price for all parts and labour, you can use this boiler price calculator on WarmZilla’s website. WarmZilla currently run a promo (use the WZ-200 discount code at check out and save £200) so their prices are some of the most competitive in the UK.

How Does Combi Boiler Fitting Cost For Gas, Oil And LPG Compare?

Typically, we’d not expect the cost of replacing a combi boiler to change based on fuel type. The price is more likely to differ based on the fitter you use, rather than the fuel type your boiler uses.

However, it’s worth bearing in mind that you’ll need a Gas Safe engineer for gas boilers, a Gas Safe engineer with Gas Safe LPG accreddiation for LPG boilers, and an OFTEC engineer for oil boiler installations.

What is worth mentioning, is that larger oil boilers can be extremely heavy. A typical gas and LPG combi boiler might be as little as 42kg.

However, oil boilers can be 100kg and beyond. If you’ve got a large oil boiler, especially if it’s in a hard to access installation area, that quickly makes a 1-person job, a two person job.

It’s likely your boiler fitter is going to account for the additional cost of having a 2nd pair of hands to help them move and fit the boiler.

How Combi Boiler Fitting Cost Is Determined

Obviously, there’s a big difference between £350 for labour, and a £750 boiler replacement. So, why do costs vary so much?


As we’ve already mentioned, a heavy boiler is going to mean that the boiler replacement is a two person job, and that’s going to increase costs. Typically, most gas and LPG installations in residential properties can be done by one person.

For oil boilers, you should expect two boiler fitters to complete the install, increasing overall labour costs.

Complexity Of The Replacement

Some boiler replacements are straight swaps. That means a few connections are loosened, the old boiler is removed, and the new one slots in its place. That means your boiler installer can get right to testing the boiler, ready to sign it off as Gas Safe.

Not all boiler installations are this simple. If your new boiler isn’t the same as your old one, the engineer might need to change pipework and re-drill holes to mount the boiler. This all takes time, and that’s going to add to the cost of fitting your new boiler.

Additional Installs

There are a few things that might have been included in your installation quote, that are going to increase costs. If your quote includes a cylinder, magnetic boiler filter, or limescale filter, these all need to be fitted. And the cost of fitting these parts, can be into the hundreds.

Additional Works

A boiler fitter needs to leave your property in the state they found it in. If the install is complex, they might have needed to drill a new core hole for a flue, remove floorboards, or chip away plaster.

All of these things take time to patch up, and all that time, means more labour cost.


When looking at new boiler cost estimates online, it’s also worth taking into consideration where you live. Typical labour rates in central London, could be as much as 2x that of the price of labour in the North. And, that’s going to directly impact the quote you get for fitting a boiler.

Getting The Best Prices For Combi Boiler Replacement

There are plenty of ways to find cheap combi boiler replacement companies. However, there are some that are better than others.

Personally, I’d always do one of two things before getting a new boiler installed.

The first, is check out an fixed price online boiler installer, like WarmZilla. You’ll find a Worcester 25i installation is £1,639 (with discount code WZ-200) that’s £300-400 cheaper than a lot of other companies will charge.

But, if you’d prefer an on-site visit to spec your property, and then get up to 3 quotes from local installers, you can fill out this form and do that for free.

What’s Next?

Thanks for reading our quick-fire guide to boiler fitting costs (labour only).

Got questions about the best boiler brands to buy, which fitter to use, or whether your quote is a rip off? Fire away and leave a comment below; we’ll get back to you as soon as we can.



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