- May 28, 2026
- By Marvin
- Uncategorized
If you're pricing a London retrofit, a realistic installed underfloor heating cost is usually £60 to £85 per m² for electric and £95 to £110 per m² for wet systems, with materials and labour included. Across an average-sized property, installed underfloor heating commonly lands somewhere between £3,000 and £13,000.
If you're standing in a cold kitchen in Clapham or looking at a bathroom renovation in a Victorian terrace, that range probably feels wide. It is. The gap comes down to the type of system, the floor build-up, and how much work your property needs before any heating goes down.
In London, that matters more than many national guides admit. A neat new-build flat with clean levels and predictable electrics is one thing. A period conversion with uneven subfloors, old circuits and limited floor height is another. The second job almost always costs more, even if the room size looks modest on paper.
Homeowners often misjudge costs. They compare product prices online and assume that's the job cost. It isn't. Installation alone is often a major chunk of the total, especially in retrofit work where access, floor prep and certification all have to be accounted for.
Table of Contents
- Your Guide to Underfloor Heating Costs in London
- Electric vs Wet Systems The Upfront Investment
- What Factors Change Your Installation Price
- Real London Price Examples Case Studies
- Beyond Installation Comparing Running Costs
- Hiring Safely Your Compliance and Installer Checklist
- Frequently Asked Questions About Underfloor Heating
Your Guide to Underfloor Heating Costs in London
The short version is this. Retrofit underfloor heating costs more than most homeowners expect, and London properties push that even higher when floor levels, access and existing electrics complicate the install.
Independent UK pricing puts installed underfloor heating for an average-sized property at £3,000 to £13,000, with electric systems at £50 to £75 per m² in new builds and £60 to £85 per m² in retrofits, while wet systems sit around £85 to £100 per m² in new builds and £95 to £110 per m² in retrofits according to Checkatrade's underfloor heating cost guide. The same guide notes, via Nu-Heat, that installation often accounts for about 40% to 50% of the total system cost.
That last point is the one I'd pay attention to if you own a London flat or terrace. In places like Balham, Streatham or Wimbledon, the quote often shifts because the heating isn't the hard part. The hard part is what sits underneath it.
What you're really paying for
A proper underfloor heating installation cost usually includes more than the heating element or pipework itself.
- System materials. Mats, cables or pipework, plus controls.
- Floor preparation. Levelling, insulation layers and dealing with the existing subfloor.
- Electrical work. Safe connection, testing and certification for electric systems.
- Finishing coordination. Working around tiles, engineered wood or other floor finishes.
Practical rule: If a price looks unusually low, check whether it excludes floor prep, electrical connection or thermostat supply. That's where many “cheap” quotes start growing.
Why London homes vary so much
A new-build apartment usually gives you flatter floors, easier access and fewer surprises. A Victorian terrace or period conversion can bring uneven timber, restricted floor depth, awkward room shapes and older fuseboards that may need checking before extra load is added.
That's why the underfloor heating installation cost isn't just about square metres. It's about how much disruption the property creates.
For electrical connection and final commissioning of electric systems, a qualified installer matters. For homeowners comparing options, electric underfloor heating installation in London is one route if you want the electrical side handled alongside the fit.
Electric vs Wet Systems The Upfront Investment
Electric and wet underfloor heating solve the same problem in different ways. One uses heating cables or mats beneath the floor finish. The other uses water pipes connected into a broader heating system. The upfront cost difference is usually significant.
Electric systems cost less to fit
Electric underfloor heating is normally the easier and cheaper install. In practice, it suits single rooms and smaller retrofit jobs because the system is thinner, the disruption is lower, and there's no wet heating circuit to build into the property.
If you're fitting out a bathroom, en-suite or small kitchen refurb, electric often makes sense on installation cost alone. It's also easier to phase into an existing London home without redesigning the whole heating setup.
A useful background read on best underfloor heating options helps if you're still choosing the basic system type rather than comparing quotes.
Wet systems cost more because the build-up is bigger
Wet systems cost more upfront because the work is broader. You're dealing with pipework, manifolds, floor build-up and often screed or low-profile overlay systems. In a clean new-build, that can be planned in from the start. In a retrofit, it can become the dominant cost.
Nu-Heat notes that installation is typically 40% to 50% of system cost, with warm-water underfloor heating starting from about £50/m² for some projects, while a 60m² Victorian-terrace retrofit can reach around £6,000+VAT for the UFH system alone before installation and screed in its underfloor heating costs guide.
That's a very familiar London pattern. The older the property, the less likely it is that the floor will accept a wet system without compromise.
A quick visual can help if you're weighing the two approaches side by side.
Which one works better in London homes
For many flats and room-by-room renovations, electric is the straightforward option. It keeps floor build-up lower and avoids the plumbing complexity that often causes trouble in conversions and upper-floor properties.
Wet systems usually earn their keep when you're heating a larger area, reworking the whole ground floor, or planning the system into a major renovation from the outset.
A homeowner in a Victorian terrace usually doesn't have a heating problem alone. They have a floor depth problem, an access problem and often an existing services problem.
What Factors Change Your Installation Price
The same square metre rate can produce very different final invoices. In London, that usually comes down to the building, not the brochure.
Property type changes the job before it starts
A renovated property almost always costs more than a new build because the installer is adapting to what already exists. OVO says electric underfloor heating in a renovated property starts at around £3,600+ for the system and typically lands around £4,000 to £4,500 installed, while a new-build electric system starts at around £2,100+ and usually lands around £2,300 to £2,600 installed in its underfloor heating guide. The same guide gives £10,000 to £11,000 installed for water-based retrofit systems, and points to Nu-Heat examples such as a 100m² bespoke screed system at about £5,000+VAT excluding screed and installation and a 60m² Victorian-terrace retrofit at about £6,000+VAT before installation.
That's why a Victorian terrace in Clapham or a period flat conversion in SW17 tends to cost more than a new-build flat with level subfloors and cleaner access.
Floor preparation can decide the quote
Subfloor condition matters. A solid, flat base keeps the install predictable. Uneven timber floors, damaged boards, poor levelling or limited build-up height do the opposite.
Typical issues that increase cost include:
- Raised floor levels. Doors, skirtings and thresholds may all need adjustment.
- Uneven or flexible subfloors. These need correction before heating goes down.
- Existing finishes. Removing old tiles, adhesive or coverings takes time.
- Flooring compatibility. Tile, engineered wood and vinyl all have different installation requirements.
If you're tiling over the system, the floor layers matter just as much as the heating itself. Good underlayment planning helps ensure durable tile installations and avoids movement or cracking later.
Insulation and controls affect both cost and performance
Insulation boards add cost, but skipping them usually gives you a worse result. You don't want heat disappearing into the subfloor, especially in older London properties where thermal performance is already inconsistent.
Controls also move the quote. A simple thermostat is one thing. A smart control setup tied into wider heating schedules is another. The material cost rises, and the commissioning can take longer too.
On site reality: The cheapest system on paper often becomes the most frustrating if the floor wasn't prepared properly and the controls weren't matched to how the room is actually used.
Real London Price Examples Case Studies
Generic national averages are useful, but homeowners usually want to know what a real job might look like. The table below uses common London scenarios and applies the published retrofit rates, then layers in practical site allowances using the business's own labour structure where relevant, such as £75 per hour, £350 day rate, and the fact that work is priced from a minimum 1 hour, then 20-minute increments.
Sample Underfloor Heating Installation Costs in London
| Project Scenario | System Type | Area Size | Estimated Material Cost | Estimated Labour Cost | Estimated Total Cost |
|---|---|---|---|---|---|
| Bathroom in a Clapham flat | Electric | 5m² | Based on retrofit electric pricing, materials and core system allowance sit within the installed market range | Electrician connection and testing usually suit a short visit or part day depending on access | Around £300 to £425 using the retrofit electric range of £60 to £85 per m² |
| Kitchen in a Tooting terrace | Electric | 20m² | Higher material use, plus insulation and controls if needed | Labour can stretch if floor prep or levelling is required before final floor finish | Around £1,200 to £1,700 using the retrofit electric range of £60 to £85 per m² |
| Ground floor extension in Wimbledon | Wet | 40m² | Pipework, controls and floor build-up create a bigger material package | Labour is heavier because the system build is more involved and often coordinated with other trades | Around £3,800 to £4,400 using the retrofit wet range of £95 to £110 per m² |
How to read these examples properly
These are not fixed quotes. They are working examples built from the verified installed ranges, then framed around property types we see across South West London.
The biggest variable is still the condition of the floor and the existing electrical setup. A simple bathroom job can stay close to the lower end if the room is stripped back already and the supply is straightforward. The same room can move up quickly if you need floor repairs, extra preparation or consumer unit checks before connection.
If your wider renovation also includes electrical upgrades, it helps to compare the heating work with the rest of the job budget. A rewire cost calculator can help you sense-check whether the property is heading toward partial upgrade territory rather than a single install.
These examples are most useful when you treat them as budget planning figures, not promises. The site visit is where the hidden costs show themselves.
Beyond Installation Comparing Running Costs
The cheapest system to install isn't always the cheapest system to own. That's the mistake I see most often.
Electric is cheaper to install, not to live with
For UK properties, MyJobQuote places installed electric underfloor heating at £40 to £90 per m² and wet systems at £100 to £190 per m² in its underfloor heating cost guide. The same verified data notes that Nu-Heat says electric underfloor heating can cost around three times more to run than warm-water systems because electricity is more expensive than gas.
That doesn't make electric a bad choice. It means you should use it where it fits.
Electric usually works best when the room is:
- Small. Bathrooms, en-suites and compact kitchens are the classic examples.
- Used intermittently. Spaces you want warm at specific times, not all day.
- Hard to retrofit for wet heating. Upper floors and period conversions often fall here.
Wet systems suit larger areas better
Wet underfloor heating tends to make more sense once you're heating larger areas or planning whole-floor comfort rather than spot heating. The upfront bill is heavier, but the running profile is usually kinder over time.
That's especially relevant in open-plan ground floors, rear extensions and major refurbishments where the heating is meant to carry more of the load. In those situations, the long-term trade-off often favours wet systems even though the installation quote looks painful.
A simple way to think about it:
| Best fit | Usually favours |
|---|---|
| Single bathroom refurb | Electric |
| Small kitchen renovation | Electric |
| Large extension | Wet |
| Whole ground floor project | Wet |
If your project starts with “I just want warm tiles in the morning”, electric often wins. If it starts with “I want this whole floor heated properly”, wet usually deserves a serious look.
Hiring Safely Your Compliance and Installer Checklist
Underfloor heating isn't just a flooring upgrade. On the electric side, it's regulated electrical work and needs to be treated that way.
What to ask before you book
For electric underfloor heating, ask direct questions. If the installer gets vague, keep looking.
- Are they Part P certified contractors. That matters for domestic electrical compliance.
- Are they City & Guilds qualified. You want formal trade competence, not guesswork.
- Are they insured. Electricians London 247, for example, states £5 million public liability plus professional indemnity cover.
- Will the quote be itemised. You need to see what covers floor prep, controls, connection and testing.
- Who is doing the electrical connection. This should not be left as an afterthought.
If you need to compare local firms, a page on how to find a local electrician is useful for checking what a proper booking process and scope should look like.
What the electrical side should include
A proper electric underfloor heating job should include the final electrical connection, testing and the right certification. It should also consider whether the existing circuit arrangement and consumer unit are suitable for the added load.
In older homes, especially ex-local-authority flats and period conversions, that check matters. A warm floor is no use if the circuit arrangement is poor or the board is already overloaded.
Here's the checklist I'd use as a homeowner:
- Ask for a paid diagnostic or survey visit. A real quote comes from inspecting the floor build-up and the existing electrics.
- Check the exclusions. Floor removal, levelling, thermostat supply and final floor finish are often where misunderstandings start.
- Confirm certification. You should know what paperwork you'll receive after the electrical work is completed.
- Ask who coordinates with the floor layer. A good install depends on both trades working in the right order.
Good installers are usually specific. They'll talk about subfloors, load, controls and certification. Poor ones talk only about the mat price.
Frequently Asked Questions About Underfloor Heating
How long does installation take?
It depends on the floor build-up and whether this is a clean renovation stage or a retrofit into a finished home. Electric systems are usually quicker because there's less structural work involved. Wet systems often take longer because they involve more floor construction and coordination with other trades.
Can underfloor heating go under wood, tile or carpet?
It can go under many floor finishes, but the right system and floor build-up matter. Tile is often the simplest finish because it handles heat well. Timber, laminate and carpet need the flooring specification checked properly before anyone installs the heating.
Will I need a fuseboard check first?
Sometimes, yes. If the property has an older consumer unit, limited spare capacity or a history of tripping, the electrical side should be assessed before installation. That's common in older London homes and conversions.
Who actually does the work?
For electric underfloor heating, the floor preparation may involve a builder, tiler or flooring contractor, but the final electrical connection and testing should be done by a qualified electrician. On wet systems, you'll usually have plumbing and heating trades involved as well.
Is a paid callout worth it for quoting?
Yes. For this kind of work, remote pricing only gets you so far. Photos or a short video can help tighten the quote before the visit, but they don't replace an on-site inspection of the floor, access and existing electrics.
How do I get an accurate quote for my London property?
Send clear photos or a short video of the room, the current floor, the thermostat location if there is one, and the consumer unit. That helps the electrician prepare. After that, book a paid callout so the installer can check floor build-up, supply requirements and what preparation the job requires.
Book a paid callout with Electricians London 247. Secure your slot with a 30% deposit. Send a photo or short video first and we'll prepare a tighter quote before we arrive.