Underfloor Heating Cost UK (2026 Guide)
Wet underfloor heating costs £800–£2,000 per room fitted during renovation in the UK in 2026, and £2,500–£6,000 for a whole ground floor in a new screed, including manifold, controls and commissioning. Retrofitting into finished rooms with low-profile systems prices similarly per room but adds floor-height decisions. The honest cost story: UFH is cheapest when the floor is open anyway, and its running costs reward the low temperatures that suit condensing boilers and heat pumps.
Costs by installation type
In-screed systems (new builds, extensions, renovations with floors up): pipe, insulation and fixing £40–£70/m², plus the manifold and controls (£400–£900 for a typical setup), plus the screed you were likely pouring anyway. A 20m² kitchen-diner lands £1,000–£1,800; a 60m² ground floor £2,500–£4,500 before finishes. Low-profile retrofit boards over existing floors: £60–£100/m² for the system, putting the same kitchen at £1,400–£2,200 with height build-up of 15–25mm to plan around.
The line items that surprise: floor insulation beneath the pipe (non-negotiable — £8–£15/m² and the difference between heating the room and the ground), zone controls per room (£80–£150 each), and the mixing arrangement where UFH pairs with a boiler running radiators upstairs (£200–£400). Heat pump pairings skip the mixer — the pump's natural temperatures are UFH's design temperatures, which is why the two get specified together.
Retrofit realities
Retrofitting into finished rooms is a floor-height negotiation: low-profile systems add 15–25mm plus the new finish, which meets doors, thresholds, kitchen kickboards and stair bottoms with varying grace. Costs rise where doors need trimming and thresholds rebuilding — £150–£400 of carpentry commonly rides along. Timber suspended floors offer the between-joists route instead: heat-spreader systems fitted from below or with boards lifted, £50–£90/m², no height change, at the cost of lifting-and-relaying labour.
The candid retrofit advice: one high-value room (the kitchen, the bathroom) retrofits well and delights daily; whole-house retrofit into a finished home rarely justifies its disruption against upgrading radiators — the exception being renovations and heat pump conversions, where the design case strengthens enough to carry the works.
Running costs and the efficiency story
UFH runs water at 35–45°C against radiators' 60–70°C, and that difference is the efficiency story: condensing boilers condense properly at UFH temperatures (recovering their headline efficiency), and heat pumps hit their best SCOPs. The floor's thermal mass suits steady, scheduled running — set-and-leave with setbacks, not on-off blasts — and zone controls stop the slab heating rooms nobody's using.
Where UFH bills disappoint, the design confesses: skimped under-pipe insulation feeding the ground, slabs run like radiators (blast heating fights thermal mass and loses), or single-zone whole floors. Designed and driven properly, UFH matches or modestly beats equivalent radiator heating on running cost while winning on comfort — the honest pitch is comfort first, efficiency respectable.
Worth-it verdicts by situation
Clear yes: extensions and renovations with floors open (marginal install cost, maximum benefit), bathrooms and kitchens (warm floors where bare feet and wall-space scarcity live), and any heat pump installation (the pairing flatters both technologies). Situational: single-room retrofits where the height works. Honest no: whole-house retrofit into a finished, radiator-served home purely for efficiency — the payback isn't there; buy it for comfort or not at all.
Get UFH quotes with the same discipline as any heating work: room-by-room heat-loss basis, insulation spec stated, zoning and controls itemised, and the pressure-test-before-screed milestone in writing. The floor closes over the pipework for decades — the quote should read like someone who plans to get it right first time.
| Installation | Typical price | Notes |
|---|---|---|
| In-screed, per m² | £40–£70 | Floors open anyway |
| Low-profile retrofit, per m² | £60–£100 | +15–25mm height |
| Single room (20m²), renovation | £1,000–£1,800 | Incl. manifold share |
| Whole ground floor (60m²) | £2,500–£4,500 | New screed |
| Manifold + controls | £400–£900 | Typical setup |
| Zone thermostat (each) | £80–£150 | Per room |
Getting an accurate price for your job
Two minutes of preparation converts these national bands into an accurate personal quote: note the boiler make, model and rough age (all on the front or inside the door), any error code, your bathroom count and — for installation quotes — your mains flow rate. Engineers price uncertainty defensively, so removing uncertainty is how informed customers pay less for identical work.
Frequently asked questions
How much does underfloor heating cost per m²?
In-screed during renovation: £40–£70/m² plus manifold and controls. Low-profile retrofit: £60–£100/m² plus any carpentry the height change forces. Whole-floor jobs share the manifold cost across rooms.
Is underfloor heating expensive to run?
Run at its design temperatures with proper insulation beneath, no — the low flow temperatures suit condensing boilers and heat pumps. Bills go wrong on skimped insulation, missing zones, or radiator-style blast running against the floor's thermal mass.
Can UFH replace radiators completely?
Downstairs, commonly; whole-house, in well-insulated homes with the right design. Mixed systems — UFH down, radiators up — are the pragmatic renovation norm and run happily from one boiler or heat pump via the manifold.
Does underfloor heating add value to a house?
It's a valued feature in kitchens, bathrooms and open-plan spaces — buyers notice warm floors. Value follows the rooms people care about rather than blanket coverage, which conveniently matches where UFH makes cost sense anyway.
If you'd rather hand this over
Plenty of readers reach this point, weigh the afternoon involved, and sensibly hand it to someone who does it weekly. No judgement — that's what the network exists for. Every engineer is Gas Safe registered (plus OFTEC for oil and MCS for heat pumps), insured and locally based; prices are agreed up front; and genuine no-heat emergencies are prioritised. Describe the symptoms you've identified here and you'll get an accurate price rather than a guess — informed customers reliably get better quotes.
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