DATA-BACKED GUIDE · UPDATED JULY 2026
Boiler quote too high? The national-firm markup trick
A boiler quote often looks too high because it is coming from a large national installer whose price includes call centre costs, sales commission and a franchise fee on top of the boiler and labour, not because the job itself costs more than a local firm would charge. The parts are usually identical: the same boiler, the same brand of controls, often even subcontracted labour from a Gas Safe engineer working in your area. What differs is the layer of overhead sitting between you and the person actually doing the work.
The quick version
- National installers and price comparison sites often quote noticeably more than a local firm for the same boiler and labour package.
- Much of the difference covers advertising, call centre staff, sales commission and franchise fees, not better parts or workmanship.
- A local, independent Gas Safe engineer fitting the identical boiler brand is often doing the same job for less.
- Some national firms subcontract the actual installation to local engineers anyway, so you can end up paying extra just for the referral.
- Getting at least one quote from a local independent installer alongside a national one is the simplest way to see the markup in cash terms.
What people actually paid
Real prices, in people's own words
- £2,000“a 30kw one at a cost of £2k January 2021”
- £2,000“£2k”
- £2,400“I recently had a Worcester boiler installed (no other work, just a new boiler) and that was £2400 on it's own (including VAT and labour).”
- £2,500“just paid 2500 for a new combi (similar cost boiler)”
- £2,500“just paid 2500 for a new combi”
- £3,500“We paid £3500 to have a new boiler fitted and the old back boiler removed for my mum”
Genuine amounts posted publicly. We publish the price and the quote, never the person.
Why the price varies so much
The price gap between a national installer and a local firm is rarely about the physical work involved. Both are fitting the same Boiler, often from the same handful of manufacturers, and the installation itself takes a similar amount of time either way. National firms carry a much bigger sales and marketing operation, and some pass the actual fitting to a subcontracted local engineer regardless of who took your call. That overhead has to be recovered somewhere, and it lands entirely on the quote. The same pattern shows up whenever a job is bought through a big lead-generation brand rather than a tradesperson directly. A Heat pump installer sold through a national franchise can carry a similar markup, and even smaller jobs like an Underfloor heating retrofit or a new Consumer unit (fuse board) get quoted higher once a call centre and a sales visit are added to the process. Going direct to a local, insured engineer usually closes most of that gap.
How to pay less
- Get a quote from at least one local, independent Gas Safe engineer before accepting a national firm's price, even if you found them through a comparison site.
- Ask exactly which boiler model and warranty length is included, since national firms sometimes fit a cheaper unit than the one advertised.
- Check whether the installer is subcontracting the actual work, and if so, ask whether you can book the subcontractor directly instead.
- Avoid the free survey that comes with heavy sales pressure on the day. Ask for the quote in writing and take time to compare it.
- Confirm the manufacturer's warranty length and registration are the same across quotes, since a shorter warranty can make a cheaper quote actually worse value.
Common questions
Why is my boiler quote so much higher than a friend's?
The gap is usually down to who quoted it, not what was fitted. A national installer's price includes marketing, call centre staff and sales commission on top of the boiler and labour, while a local independent engineer's price mostly reflects the parts and their time.
Do national boiler companies use better engineers?
Not necessarily. Many national firms subcontract the physical installation to local Gas Safe engineers, the same pool of tradespeople a homeowner could book directly. The qualification that matters, Gas Safe registration, applies equally to independent engineers.
Is it worth getting a quote from a local independent installer?
Yes. Comparing a national quote against at least one local, independent Gas Safe engineer is the quickest way to see whether you are paying for overhead rather than for the job itself. The boiler and labour are often near-identical, so a big price gap is a signal worth questioning.
Should I always choose the cheapest boiler quote?
Not automatically. Check the boiler model, warranty length and whether the price includes a system flush, controls and building control notification. A cheaper quote that leaves out any of these can end up costing more once the gaps are filled in.
Does a boiler installation qualify for a government grant?
Standard gas boiler replacements generally do not qualify for heating grant schemes, which are aimed at low-carbon heating like heat pumps. If a boiler quote mentions a grant, check exactly what it covers before assuming it reduces your price.