New boiler cost in Surrey: what to expect in 2026

There's no official price list for a new boiler in Surrey. The most useful published figure comes from the Energy Saving Trust, which estimates that replacing an old G-rated gas boiler with an A-rated one, with thermostatic radiator valves, costs around £3,500 on average in Great Britain (accessed November 2026). What you'll pay in Surrey depends on the type of boiler you have now, the type you're moving to, and the work around it. Get at least three itemised quotes, check the engineer on the Gas Safe Register yourself, and never agree to a boiler on the doorstep.

TradesAround Team · about 8 minutes to read

In this guide:

• The short version
• What a new boiler costs: the figures we can source
• Which boiler type are you replacing?
• What to get itemised on every quote
• Surrey's water and your new boiler
• Grants: what Surrey homeowners can and can't get
• Cold callers and the 14-day cooling-off period
• Checking the engineer and the paperwork
• Frequently asked questions

The short version

• Average gas boiler replacement: around £3,500 in Great Britain, according to the Energy Saving Trust. That's a national estimate. There are no official Surrey-only figures.
• A like-for-like swap is the simplest job. Changing from a system or heat-only boiler to a combi, or the other way round, means extra work, so ask for it as a separate line.
• Surrey's water is mostly hard. Ask every installer how the new boiler will be protected from limescale.
• The Boiler Upgrade Scheme doesn't pay anything towards a replacement gas boiler. The Energy Company Obligation can help only certain households with a boiler, and it closes on 31 December 2026.
• Surrey County Council runs the Warm Homes: Local Grant for low-income households. It can fund insulation and an air source heat pump, not a gas boiler.
• Work agreed at home usually has a 14-day cooling-off period, and the trader must tell you in writing. Trading Standards says don't agree to anything on the spot.

What a new boiler costs: the figures we can source

These are published estimates and grant amounts. Your own quote will vary from house to house.

We haven't found an official source for labour rates or the price of conversions and extras in Surrey, so we've left those out rather than guess. That's where quotes differ most, so if one is far below the others, find out what's missing.

Which boiler type are you replacing?

The biggest question for your quote is whether you're keeping the same type of boiler. The Energy Saving Trust describes three types:

• Combi boilers heat water on demand, with no hot water cylinder. They suit smaller homes and are often the least expensive type, but the Energy Saving Trust says they may be less suited to homes with several bathrooms or low water pressure.
• System boilers store hot water in a cylinder, so they're a good choice for bigger households that run several taps at once.
• Heat-only boilers (also called regular or conventional) work like system boilers but also need two cold water tanks, usually in the loft. The Energy Saving Trust says they're unlikely to suit a flat.

Like-for-like swap

Replacing a combi with a combi, or a system boiler with a system boiler, usually means less new pipework and no tanks to move.

Changing type

Swapping a heat-only boiler and loft tanks for a combi means removing the tanks and cylinder and re-piping, which is priced differently. The Energy Saving Trust points out that most heat pumps work with a hot water cylinder, so if you take yours out now, you may need another one if you switch to a heat pump later.

What to get itemised on every quote

The boiler itself often isn't what decides the final bill. Ask each installer to list these separately, or confirm in writing that they aren't needed:

• The boiler: make, model, output (kW) and warranty length.
• Any change of boiler type, including removing tanks or a cylinder.
• The gas supply pipe: a bigger boiler can need a larger pipe from the meter. Ask whether yours does, and why.
• Moving the boiler or fitting a new or longer flue.
• Cleaning the system: a chemical flush or a powerflush, and what the engineer saw that justifies it.
• A magnetic filter: the Energy Saving Trust says building regulations encourage them, and that your installer should fit one near the boiler if you don't already have one.
• Controls: which thermostat, and whether thermostatic radiator valves are included.
• Scale protection (see the next section).
• Making good where the old boiler, tanks or flue were, and taking the old boiler away.

The Energy Saving Trust recommends getting at least three quotes, and suggests looking for installers certified by TrustMark, a government-endorsed quality scheme.

Surrey's water and your new boiler

Surrey has more than one water company, so start by checking your water bill to see who supplies you. Then check what that company says about your water:

• Affinity Water says the water it supplies is classed as "hard" or "very hard".
• SES Water says much of its water comes from underground boreholes in limestone or chalk, which tends to be naturally hard, and that it softens some of it slightly during treatment. How hard yours is depends on where you live, and SES Water has a postcode search for each supply zone.
• Thames Water says that all the water in its region is hard.

Hard water is safe to drink, but it leaves limescale. Ask every installer what scale protection is included, especially with a combi, and keep up the annual service, which is usually a condition of the manufacturer's warranty too.

Grants: what Surrey homeowners can and can't get

The Boiler Upgrade Scheme

The Boiler Upgrade Scheme pays £7,500 towards an air source or ground source heat pump, £5,000 towards a biomass boiler and £2,500 towards an air-to-air heat pump, with one grant per property. GOV.UK says you can't get a grant for a hybrid system, such as a gas boiler with a heat pump, and the scheme doesn't fund gas boilers. Eligibility rules apply, so check them before you plan around the money.

The Energy Company Obligation

GOV.UK says that if you get certain benefits, such as Universal Credit, Pension Guarantee Credit, Child Benefit or Housing Benefit, and own a home rated D to G for energy efficiency, you might get help with the cost of replacing or repairing your boiler through an energy supplier. The scheme closes on 31 December 2026. To apply, ask your council whether it's taking part, or contact an energy supplier directly.

Surrey's Warm Homes: Local Grant

Surrey County Council runs the Warm Homes: Local Grant on behalf of 11 Surrey boroughs and districts. The council says the scheme began on 1 September 2025 and is planned to run until 31 March 2028. For eligible owner-occupiers it's fully funded, with no contribution expected. It can pay for insulation, solar panels, an air source heat pump or high retention storage heaters, and the home is insulated first if it needs it. A gas boiler isn't on the list.

To qualify, your home must have an EPC rating of D to G, and your household must usually have a gross income of £36,000 or less, get certain means-tested benefits, or live in an eligible postcode. A survey decides what's viable, and funding isn't guaranteed. The council's team is on energy@surreycc.gov.uk or 01483 404 505.

Weighing up a heat pump against a boiler? Ask a heating engineer to explain both, including running costs on your tariff.

Cold callers and the 14-day cooling-off period

Trading Standards for Surrey is a joint service with Buckinghamshire, run by Surrey County Council since 2015. Its advice on doorstep cold calling warns that uninvited traders may push you into work you don't need, and that the price can climb once they start. It says:

• You don't have to talk to them at all.
• Don't agree to anything on the spot.
• If you do agree to work at your home, the trader is legally required to give you a written notice of your 14-day cooling-off period.
• Get quotes from other companies before you decide.
• Don't pay cash on the doorstep.

To report a trader, call the Citizens Advice consumer service on 0808 223 1133, which passes cases to Trading Standards. If the trader is still there, call the police on 101, or 999 if you feel threatened. Trading Standards also offers a free No Cold Calling sticker.

Take the same care with calls about "free boiler grants". If you're not sure an Energy Company Obligation offer is genuine, GOV.UK says to check with your council or the energy supplier the caller says they represent.

Checking the engineer and the paperwork

1. "Can I see your Gas Safe ID card?" Look up the licence number on the Gas Safe Register, or call 0800 408 5500, and make sure the engineer is qualified for the work you're having done. Our guide on how to check a Gas Safe engineer before you book walks you through it.
2. "Will you be doing the work yourself?" A registered business isn't enough. The person fitting your boiler needs to be registered too.
3. "How did you size the boiler?" Ask them to explain how they worked out the output your home needs.
4. "What isn't included in this price?"
5. "Will you register the warranty and the work?" The Energy Saving Trust says your installer should make sure the system meets building regulations and give you the paperwork to prove it. Keep it safe, because you'll need it when you sell.

Frequently asked questions

How much does a new boiler cost in Surrey?

There are no official Surrey-only prices. The Energy Saving Trust estimates around £3,500 on average in Great Britain to replace an old gas boiler with an A-rated one, with thermostatic radiator valves. Changing boiler type, moving the boiler or upgrading the gas pipe adds to that, so get at least three itemised quotes.

Can I get a free boiler in Surrey?

Not through the Boiler Upgrade Scheme or Surrey's Warm Homes: Local Grant, as neither funds gas boilers. If you get certain benefits, the Energy Company Obligation may help with replacing or repairing a boiler until it closes on 31 December 2026, but energy suppliers decide what they'll fund. Treat any cold caller promising a free boiler with caution.

What does the TradesAround Trust Score cover?

The Trust Score is an automated assessment of a business's Google reviews, its Companies House record and its TrustMark registration, and nothing more. You can read how the Trust Score works. Trust Scores aren't for sale. Pro members are listed first, with a Pro badge. The score doesn't cover Gas Safe registration, so check the Gas Safe Register yourself before you book.

Need a tradesperson?

When you're ready for quotes, browse gas engineers in Surrey on TradesAround, or start with a town: Guildford, Woking, Epsom, Redhill, Godalming and Addlestone. For heat pump advice as well as boilers, try heating engineers across Surrey, including Camberley, Farnham and Oxted. Compare a few, then check the engineer on the Gas Safe Register.

Comparing with a neighbouring county? See our guides to new boiler costs in Berkshire and what a new boiler costs in Oxfordshire.

Figures are published estimates and grant amounts from the sources named above, checked in November 2026. Always confirm the price, what's included and the warranty terms in writing before you sign.