How much does it cost to replace a thermostat? [November 2025]

How much does it cost to replace a thermostat?

The labour for replacing a thermostat typically costs between £60 - £150, including VAT. The total cost will depend on a few factors, but the type of thermostat you're installing will usually be the biggest factor.

The process usually takes under an hour, though it may take longer if additional wiring or configuration is required - for example, if you’re upgrading from a manual to a smart thermostat like Hive or Google Nest.

Here's a breakdown of what you can expect to pay to replace your thermostat in London and outside of London.

How much does the thermostat itself cost?

These days, there are several different types of thermostats available - from simple manual models to fully integrated smart systems that can be controlled remotely via your phone or voice assistant.

Smart thermostats like Hive and Nest sit at the higher end of the price range, but they come with extra features such as remote control via your smartphone, learning algorithms that adjust to your habits, and integration with smart home systems like Alexa and Google Home.

While you can supply your own thermostat, it’s often easier to have your engineer source one for you. They’ll usually pick up the correct model for your heating system and can ensure compatibility. Just keep in mind that they may charge a small fee to cover the time spent sourcing it (usually 20% of the unit cost).

Here’s what you can expect to pay for the thermostat unit itself:

Which other factors impact the cost of replacing a thermostat?

A few different factors can influence how much you’ll pay to have your thermostat replaced, including who you book with and whether it’s a straight swap or a new installation (which might involve extra wiring).

1. If you're upgrading to a smart model 

Replacing a manual thermostat with another manual model is quick and straightforward, so it’s usually the cheapest option.

Upgrading to a smart thermostat like Hive or Nest can take longer, as it often involves setting up Wi-Fi connectivity, pairing with your heating system, and in some cases, installing a new receiver near your boiler.

2. If you're installing a thermostat in a different location

If you’re moving the thermostat to a new spot in your home, this will usually increase the overall cost. Your engineer may need to run new wiring through the walls, repair or make good the area where the old thermostat was fitted, and ensure the new location is suitable for accurate temperature readings (for example, away from direct sunlight or radiators). This kind of work can add anywhere from £40 - £100 to the total cost, depending on how complex the relocation is.

3. Accessibility and setup

If your existing thermostat or wiring is difficult to access (for example, hidden behind wall panels), or if your new model needs extra wiring or calibration, this can increase the overall cost.

4. Whether you book with an independent engineer vs. a professional tradesperson company

Independent heating engineers often charge slightly less than larger, more established tradesperson companies. 

Despite the higher cost, opting to go with a larger company usually works in your favour. For example, you'll typically have access to a better selection of slots, the ability to get a quote and book online instantly, plus access to a responsive customer service team if anything were to go wrong on the day.

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How often should you replace a thermostat?

Most thermostats last between 8 - 10 years, depending on the model and how frequently it’s used. However, if you’ve noticed temperature fluctuations, unresponsive controls, or inconsistent heating, it might be time to replace it sooner.

If you’re upgrading your boiler or central heating system, it’s also a good opportunity to update your thermostat - especially if you’d like better control or improved energy efficiency.

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How can upgrading to a smart thermostat reduce my energy bills?

A smart thermostat can save as much as £267 per year on the average heating bill. ^[1] So it feels like a no-brainer.
 

1. Smarter scheduling 

Smart thermostats let you set precise heating schedules that match your daily routine. You can heat your home only when you need to — for example, turning it down while you’re at work and back up before you return — so you’re not wasting energy heating an empty house.

2. Remote control

Using the app, you can adjust your heating from anywhere. If you’ve gone out and forgotten to turn it off, you can do it in seconds - or turn it on early if you’re heading home sooner than planned.

3. Geolocation features

Many smart thermostats, like Hive Active Heating and the Google Nest Learning Thermostat, can use your phone’s location to automatically lower the temperature when you leave home and warm it up again when you return.

4. Learning and automation

Models such as the Nest Learning Thermostat can “learn” your daily routine and automatically create a heating schedule around it. Over time, this helps optimise your energy use without you having to constantly tweak the settings.

5. Zonal heating and smart radiator valves

Some smart systems let you control individual rooms or “zones” separately. If you only use certain rooms during the day, you can heat just those areas rather than the whole house - another big energy saver.

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Can I replace a thermostat myself?

If you’re swapping a like-for-like battery-powered thermostat, it’s often a straightforward DIY job. However, if your thermostat is hardwired into the mains or connects directly to your boiler controls, it’s best to leave it to a qualified heating engineer.

Incorrect wiring can cause your heating system to malfunction, or worse, create a safety hazard. In particular, smart thermostats often involve extra wiring and setup steps - such as pairing a wireless receiver with your boiler - that should only be carried out by someone who understands heating system controls.

So, for most full thermostat installations or upgrades, it’s safest (and usually quickest) to book a professional.

If you’re not sure which type of thermostat you have, or whether it’s safe to replace it yourself, a heating engineer will be able to assess it for you and advise on the best approach.

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Where can I find an engineer to replace my thermostat?

Thermostat replacements are best carried out by a qualified heating engineer, especially when dealing with hardwired or smart models. If your thermostat connects directly to your boiler, you should always use a Gas Safe Registered engineer, as they’ll have the appropriate training to work safely with heating systems. You easily find a Gas Safe Registered engineer through the official Gas Safe Register website.

There are many other ways to find a trusted, local heating engineer, though - for example, through family and friends or local pages on social media. 

Or you can get an instant quote for thermostat replacement through the Housekeep website. Just let us know about your thermostat replacement, and we'll give you an instant quote for a heating engineer to come on a day and time that suits you. Need an emergency replacement? No problem - we have heating engineers available on the very same day.
 

Sources
 

1. Scottish Power: Smart thermostats ‘a quick win’ for energy efficiency

Written by Georgina Shepherd & Henry Paterson

Georgina is one Housekeep's home services experts. She's interviewed thousands of the UK's best cleaners and tradespeople - so whether you need advice on a stubborn stain, or you're looking for tips to find the perfect plumber, Georgina's got you covered.

With years of experience in the industry, Henry has delivered talks at industry events including the Ideal Home Show and regularly features as an industry expert for publications including the Sun, Mail Online, Martha Stewart and many more.