How Much Does It Cost to Install a Smart Thermostat in London? (2026 Prices)

Last updated: October 2026

The clocks have gone back, the heating is on, and the first big bill of the winter is not far away. That is when many London homeowners start looking at a smart thermostat. This guide sets out what it costs to have one installed in London in 2026, what a fair quote should include, which trade should be doing the work, and what it can realistically save, so that you can compare quotes with confidence.

TL;DR

A smart thermostat costs about £190 to £400 supplied and fitted in London and the South East in 2026, with national guides setting the upper end, or £90 to £160 for labour only. Wireless receivers, extra wiring or several heating zones push the bill to £350 to £600 or more. Ask who is fitting it and what they will touch.

What a smart thermostat costs to install in London in 2026

No regulator or trade body publishes installation prices for smart thermostats, so every figure below is market-observed from cost guides published in 2026. The clearest regional split comes from Fantastic Services, which puts a supplied-and-fitted smart thermostat at £190 to £320 in London and the South East, against £150 to £300 for the rest of the UK, and labour only (for thermostat replacement generally) at £90 to £160 in London and the South East, against £60 to £130 elsewhere [1]. MyJobQuote's national guide, based on quotes from its platform, gives £140 to £370 for the whole job with an average of about £265, and a fixed labour fee of £60 to £150 [2]. Trade2Base puts a straight swap at £200 to £400 all-in and £80 to £150 for labour alone [3]. The figures overlap well for the standard job, which is why the first rows below are the most reliable.

Job (London and South East, with national guides, 2026)	Typical price	What drives it
Labour only, straight swap (you buy the thermostat)	£90 to £160	One to two hours; the fitter does not supply the device [1][2][3]
Supplied and fitted, straight swap on existing wiring	£190 to £400	The most common job; device £100 to £300 plus labour [1][2][3]
Extra heating zone added on the same visit	from about £84	Quoted by MyJobQuote as a same-visit add-on [2]
Wireless receiver or new thermostat wiring (extra)	£150 to £300 on top	Needed where the old wiring cannot be reused [3]
Wiring centre for multi-zone control (extra)	£150 to £350 on top	Only where zones are controlled separately [3]
S-plan or Y-plan rework (extra)	£200 to £400 on top	Older systems with motorised valves [3]
Full install with new wiring and commissioning	£350 to £600+	The scope is the price [3]
Smart radiator valves, per radiator	£55 to £110 fitted	Device £40 to £80 plus £15 to £30 labour [3]
Full smart system with zoning	£900 to £2,000+	One to two days; the widest range of all [4]

Prices combine device and labour unless stated. Fantastic Services' figures include VAT [1]; other guides do not always say, so ask every fitter whether the price includes it. The regional split is for London and the South East combined, not London alone.

Treat the bottom rows as a starting point for a written quote rather than a fixed price. The £190 to £320 London and South East band comes from one provider's guide, and the £400 top of the supplied-and-fitted range from a national one [1][3]. The zoning figure rests on a single provider's guide, and the radiator-valve rows on one trade guide, with another putting smart radiator valves at £50 to £90 per radiator for the device alone [3][4]. The extras are not simply added to the straight-swap price, because they overlap; the "full install" row is the better guide to the total. Where the guides disagree, we have given the range that covers the main sources rather than averaging them.

What a fair smart thermostat quote should include

Because the scope drives the price, a fair quote, agreed before anyone starts, should state in writing:

• Whether the device is included, and exactly which model. "Smart thermostat" is not a scope.
• Who is doing the work and what they will touch. A like-for-like swap on existing wires is a different job from opening the boiler or changing the wiring that feeds it.
• Wiring: whether the existing cable and receiver are being reused, or new wiring or a wireless receiver is needed.
• Compatibility: confirmation that the thermostat has been checked against your boiler and heating type, not just fitted.
• Zones and radiator valves: what is covered if you have more than one heating zone, and whether any smart radiator valves are included.
• Commissioning: setting up the app, the schedule and the boiler link, and showing you how to use it.
• VAT: whether it is included, and how it has been treated (see the VAT section below).
• Insurance and registration: that the fitter is insured, and the relevant registration for the work (see the next section).
• Payment: a fixed price, paid on completion. A job this size should not need a large deposit.

The Consumer Rights Act 2015 requires a trader to carry out a service "with reasonable care and skill" [14], which a written scope makes far easier to rely on. For more on keeping control of payment, see our guide to how much deposit to pay a tradesperson.

Who can fit a smart thermostat: an electrician or a Gas Safe engineer?

This is the question most cost guides skip, and it affects both the price and who you should hire.

The gas rule. Regulation 3(1) of the Gas Safety (Installation and Use) Regulations 1998 says: "No person shall carry out any work in relation to a gas fitting or gas storage vessel unless he is competent to do so" [5]. The Health and Safety Executive's guidance for homes adds that "anyone employed to work on gas appliances in domestic premises must be a Gas Safe registered engineer" [6]. Neither source mentions thermostats or heating controls, so we could not find an official source that draws the line for a thermostat in particular.

What that means in practice. Which? says that, unless you are a competent DIYer or the instructions say the product can be self-installed, "we'd recommend getting a professional electrician to do it" [7]. In our reading, which is not an official ruling, a wall thermostat that only tells the boiler when to fire is a controls and wiring job on the wall rather than work on a gas appliance. Work on the boiler itself or any gas fitting is gas work, which the regulations say only a competent person may do [5] and which HSE says in a home must be done by a Gas Safe registered engineer [6]. Whether a particular change to a boiler's controls counts as gas work is a judgement for that engineer, which is why you should ask.

What to do. Ask the fitter in advance what they will touch and who will do it. If any part of the job involves the boiler itself, ask for a Gas Safe registered engineer and check their ID card, which shows what they are registered to work on. Asking one registered person to take responsibility for the whole job is often the simplest route. Our boiler service cost guide explains how to check an engineer on the Gas Safe Register before they arrive, and our boiler repair cost guide covers what work inside a boiler involves.

Is fitting a smart thermostat notifiable under Part P?

In England, regulation 12(6A) of the Building Regulations 2010 lists three kinds of electrical work that must be notified to building control: "the installation of a new circuit", "the replacement of a consumer unit" and "any addition or alteration to existing circuits in a special location" [8]. Replacing a thermostat or heating control is not on that list [8].

So a like-for-like swap of a thermostat on existing wiring is not notifiable in England. That does not mean it is unregulated: electrical work must still be safe and follow the wiring standard. If your job involves a new circuit, a new consumer unit, or electrical work in a bathroom, that part is notifiable, and your electrician should be registered with a competent person scheme. Our guide to whether you need a Part P certificate sets out the full rules.

Will a smart thermostat work with your boiler and heating?

Not every thermostat works with every system, so the match needs checking before you buy. Which? explains that "not all thermostats can modulate, and you'll need a boiler-thermostat pair that can speak a common language", the most common being OpenTherm [7]. It also notes that if you have a combination boiler, you will not need a thermostat that controls hot water [7].

Things to check before you buy:

• Boiler type. Combi, system and regular boilers (with a hot water cylinder) are controlled differently, so tell the fitter which you have. Our guide to new boiler costs explains the types.
• Modulation. Check whether your boiler can talk to the thermostat in a language such as OpenTherm, and whether it matters for the model you want [7].
• Zones. If different parts of the home are on separate timers or valves, you may need a multi-zone kit and a wiring centre [3].
• Underfloor heating and radiators. If you have underfloor heating, confirm with the manufacturer that the model supports it before you buy; see our underfloor heating cost guide. Which? lists "multi-room control or zonal heating" as a feature to look for if you want it [7].
• The manufacturer's checker. Most brands publish a compatibility checker for their own products. Use it, and ask the fitter to confirm.

What do smart thermostats cost to buy?

Which? lists retailer prices for a handful of models in its October 2026 buying guide, ranging from about £60 to £220: Habi Wireless Smart Thermostat £62, tado V3+ Starter Kit £59.99, Worcester Bosch EasyControl £170, Google Nest Thermostat E £199 and Nest Learning Thermostat £219 [7]. Installer guides, which tend to price the branded kits, put the device alone at £100 to £300 [1] and £100 to £250 [3]. MyJobQuote lists Hive at about £120 for the thermostat alone, tado at £100 to £160 and Nest at £200 to £220 [2].

Brand	Device only	Supplied and fitted
Hive	about £120	£180 to £270
Google Nest	£200 to £220	£260 to £370
tado	£100 to £160	£160 to £310

MyJobQuote platform data, last updated 9 September 2026 [2]. Retailer prices move often and kits are frequently discounted.

A cheaper device is not automatically a better deal. Which? notes that you might also need to pay someone to install it properly, "especially if your heating system is a bit older" [7].

Will a smart thermostat save you money?

Sometimes, but the claims are bigger than the evidence. Which? says that you can save money on heating bills "by controlling when your boiler is on and how hard it's working", and its boiler-efficiency tips say this could save "as much as 10% or more" [9]. That is a figure for setting up a boiler efficiently in general, not for smart thermostats in particular.

On smart thermostats specifically, Which? is cautious. It has said that it is "less clear how much you'll save if you already have a device to control and schedule your boiler", and that a smart thermostat does not solve "underlying lifestyle choices or poor property insulation issues" [7]. In an earlier Which? investigation (December 2021), manufacturers' headline claims such as tado's "up to 31%" had "no reference to the data used to calculate this percentage", and Google's figures assumed heating on for at least 17 hours a day [10]. Which? also warned against expecting "massive savings if you already use a boiler timer or programmer effectively" [10]. That article is nearly five years old, so treat the specific products as dated, but the point about how savings are calculated still holds.

In practice, you are most likely to gain if you currently have no room thermostat, an old dial you never touch, or a timer that heats an empty house. A smart thermostat is a convenience as well as a saving: Which? found that most members it surveyed said it made their heating easier to control, although that is not a measure of savings [10]. If you are heating a home that loses heat quickly, fixing the cause may save more; our guide to a radiator that is not heating up covers the common faults.

VAT: is the installation zero-rated?

Possibly. HMRC's VAT notice 708/6 says: "A zero rate applies to the installation of certain specified energy-saving materials from 1 May 2023 to 31 March 2027", reverting to 5 per cent from 1 April 2027 [11]. The list of eligible controls includes "thermostats", "manual or electronic timers" and valves including thermostatic radiator valves, and the relief applies to installations in residential accommodation [11]. It also covers the supply of the materials by the person who installs them, while supplying materials without installing them is standard-rated [11].

The notice does not name smart thermostats, so we cannot say how every fitter will treat them. Ask whether the quote is zero-rated, standard-rated or from a business that does not charge VAT, because that alone can move two honest quotes apart by 20 per cent. We did not find a general grant for fitting a smart thermostat on its own, so if you are on a low income it is worth asking your energy supplier or council whether any scheme applies to you.

If you rent

If you rent, ask your landlord in writing before you change a fixed thermostat or the wiring behind it, and keep a copy of the reply. Your tenancy agreement may restrict alterations, and the landlord generally controls the heating system. A wireless, battery-powered thermostat that you can take with you when you move may be an easier option than a hard-wired replacement, but check what you may fit first.

Why smart thermostat installation costs more in London

London prices run higher in the one guide that splits them out [1]. The likely reasons are the usual ones:

• Labour rates. Heating engineers often charge £300 to £450 per day in London and the South East [4].
• Travel and parking. Inside the Congestion Charge zone the charge is £18 a day if paid in advance or on the day, and £21 if paid by midnight of the third day after travel, between 7:00 and 18:00 on weekdays and 12:00 to 18:00 at weekends and bank holidays [12].
• Older properties. London flats and period homes more often have older wiring, hot water cylinders, several zones and awkward cupboards, which push jobs up the tiers above.

None of this makes a high quote a fair one. It explains why the London range sits towards the top of national guides, and why a clear written scope matters more than a headline price.

Can you fit a smart thermostat yourself?

Some models are designed for it. Which? says self-installation of the Nest Thermostat E "should be achievable for most", that tado "says its thermostats can be self-installed", and that Hive and the Nest Learning Thermostat recommend professional installation [7]. The Worcester Bosch EasyControl is listed as needing professional installation [7].

Even where the box says DIY, you are working with mains or low-voltage wiring and, behind it, a boiler. If you are not confident, if the wiring does not match the diagram, or if there is any chance you would open the boiler, stop and book a professional. The saving on labour, roughly £90 to £160 in London [1], is not worth the risk.

How to keep the cost down

• Check what you already have. If you have a working programmable thermostat and a good timer, the gain from upgrading may be small [10].
• Ask for labour-only prices if you want a particular model, and compare them with the supplied-and-fitted price [1].
• Add zones or radiator valves on the same visit. MyJobQuote prices a second zone at about £84 when it is fitted on the same visit as the first thermostat [2], so ask for the extras to be quoted together.
• Choose a compatible model first, so you do not pay for a second visit or a replacement.
• Combine jobs. If a boiler service or a repair is due, have the controls looked at during the same visit; see our boiler service cost guide.
• Choose a vetted trader, with insurance and reviews you can check, or a TrustMark registered business [13].

Frequently asked questions

How much does it cost to install a smart thermostat in London?

In 2026 a smart thermostat typically costs £190 to £400 supplied and fitted in London and the South East, with national guides setting the upper end. Labour alone is about £90 to £160 if you buy the device yourself. New wiring, a wireless receiver or extra zones can take the total to £350 to £600 or more.

Can I fit a smart thermostat myself?

Some models are designed for self-installation, including tado and the Nest Thermostat E according to Which?, but Hive and the Nest Learning Thermostat recommend a professional. Which? advises using an electrician unless you are a competent DIYer. If any part of the job involves the boiler, use a Gas Safe registered engineer.

Do I need a Gas Safe engineer to fit a smart thermostat?

Which? recommends a professional electrician unless you are a competent DIYer or the instructions allow self-fitting. We found no official source that draws the Gas Safe line for thermostats. Work on the boiler or any gas fitting is gas work for a Gas Safe registered engineer, so ask your fitter exactly what they will touch.

Is a smart thermostat notifiable under Part P?

No, a like-for-like thermostat swap is not on the English notifiable list. Only a new circuit, a replacement consumer unit or work on existing circuits in a special location, such as the space around a bath or shower, must be notified to building control. The work must still be safe and carried out competently by a qualified electrician.

Will a smart thermostat save me money?

It may, but the evidence is weaker than the marketing. Which? says its boiler-efficiency tips, including controlling when the boiler is on, could save as much as 10 per cent or more, but it is unclear how much extra a smart thermostat saves if you already schedule your boiler well. You gain most with no room thermostat.

Is the installation of a smart thermostat VAT-free?

It may be zero-rated. HMRC's notice 708/6 zero-rates the installation of energy-saving controls, including thermostats, in homes from 1 May 2023 to 31 March 2027, then 5 per cent from April 2027. The notice does not name smart thermostats, so ask your installer how they are treating VAT on your quote.

Find a trusted local tradesperson to fit your thermostat

A smart thermostat is a small job with a long tail: the wrong model, the wrong wiring or the wrong trade can leave you with a heating system that behaves worse than before. It is worth hiring someone who will check your system first and tell you exactly what they will do. Loacally connects you with verified local tradespeople across London, from electricians to heating engineers. Find a trusted local tradesperson near you and get a written quote for your thermostat, and see our guide to how to find a trusted tradesperson in London for what to look for.

Prices vary with your boiler, wiring, number of zones and access, so always get a written quote.

Sources

1. Fantastic Services. "Thermostat replacement cost guide" (a heating services provider's own price guide, used as market context only; figures include VAT). 2026. https://www.fantasticservices.com/cost-guides/heating/thermostat-replacement/ (accessed October 2026)
2. MyJobQuote. "Smart thermostat installation cost guide" (based on quotes on the MyJobQuote platform). Last updated 9 September 2026. https://www.myjobquote.co.uk/costs/smart-thermostat-cost (accessed October 2026)
3. Trade2Base. "Smart thermostat installation costs UK." 14 June 2026. https://www.trade2base.com/blog/smart-thermostat-installation-costs-uk (accessed October 2026)
4. BookABuilder. "Boiler controls, thermostats, TRVs and smart heating." 2026. https://www.bookabuilderuk.com/blog/boiler-controls-thermostats-trvs-smart-heating (accessed October 2026)
5. legislation.gov.uk. "The Gas Safety (Installation and Use) Regulations 1998, regulation 3." https://www.legislation.gov.uk/uksi/1998/2451/regulation/3 (accessed October 2026)
6. Health and Safety Executive. "Domestic gas safety: frequently asked questions." Updated 16 March 2023. https://www.hse.gov.uk/Gas/domestic/faqs.htm (accessed October 2026)
7. Which?. "How to buy the best smart thermostat." 15 October 2026. https://www.which.co.uk/reviews/smart-thermostats/article/how-to-buy-the-best-smart-thermostat-a3sCE7E7z92w (accessed October 2026)
8. legislation.gov.uk. "The Building Regulations 2010, regulation 12." Up to date to 25 October 2026. https://www.legislation.gov.uk/uksi/2010/2214/regulation/12 (accessed October 2026)
9. Which?. "Boiler controls and how they can save you money." Page dated 19 October 2026. https://www.which.co.uk/reviews/boilers/article/boiler-controls-and-thermostats-akDks8x1rSPe (accessed October 2026)
10. Which?. "Smart thermostats: can you save what the companies claim?" 22 December 2021. https://www.which.co.uk/news/article/smart-thermostats-can-you-save-what-the-companies-claim-aPhUI1z1HPCX (accessed October 2026)
11. GOV.UK. "VAT on energy-saving materials and heating equipment (VAT Notice 708/6)." Updated 31 January 2024. https://www.gov.uk/guidance/vat-on-energy-saving-materials-and-heating-equipment-notice-7086 (accessed October 2026)
12. Transport for London. "Congestion Charge." https://tfl.gov.uk/modes/driving/congestion-charge (accessed October 2026)
13. TrustMark. https://www.trustmark.org.uk/ (accessed October 2026)
14. legislation.gov.uk. "Consumer Rights Act 2015, section 49." https://www.legislation.gov.uk/ukpga/2015/15/section/49 (accessed October 2026)