Underfloor Heating
Probably not, unless a floor is already coming up.
For most existing UK homes, underfloor heating only pays back its disruption in one of two situations: the floor was going to be lifted anyway, or you are moving to a heat pump and want the system to work at its best. If neither is true, larger low-flow radiators give you eighty per cent of the comfort at a fraction of the cost, and we would rather see that money go into insulation first.
A room feels cold underfoot, or the existing radiators no longer suit the room.
Cold feet are often a cold-floor problem that a rug and a properly sized radiator on the right wall can solve. Worth ruling out before lifting the floor.
In a suspended timber floor, insulating between the joists is far cheaper than a full underfloor system and removes the coldest surface entirely.
If you've considered these and underfloor heating is still the right answer for your home, here's how to choose well.
In a new build, a full renovation or a room where the floor is coming up anyway, underfloor is the honest answer. It pairs particularly well with a heat pump, which likes the low flow temperatures underfloor loops run at.
The decision, in six questions
Six questions. Answered honestly, they land you on one of three verdicts without any prose in the way.
Is a floor coming up anyway (new build, extension, ground-floor renovation)?
Marginal cost of adding wet UFH becomes small.
Strong candidate
Any UFH project stands on its own; disruption dominates.
Worth considering
Are you planning a heat pump within the next three to five years?
UFH lets a heat pump run at its most efficient flow temperature.
Strong candidate
The efficiency case is real but smaller with a gas boiler.
Worth considering
Is the room a bathroom or ensuite of about ten square metres or less?
An electric mat under tile is the right tool for this size of space.
Strong candidate
For anything larger, electric UFH becomes expensive to run.
Probably not for your home
Do you have suspended timber floors with reasonable access from below?
Between-joist wet UFH is possible without lifting finishes.
Worth considering
Retrofit means either lifting the floor or accepting a 15–22mm overlay.
Worth considering
Is your main goal reduced running cost rather than better comfort?
Insulation and controls almost always beat UFH on payback.
Probably not for your home
Comfort is where UFH genuinely wins.
Strong candidate
Do you have the budget headroom for a good manifold and per-room thermostats?
The system will do what the marketing says it does.
Strong candidate
Cheap kit undoes the whole efficiency argument.
Probably not for your home
What usually changes the answer
Change one of these and our recommendation often changes with it.
You're already replacing the floor.
What changes
You're installing (or seriously considering) a heat pump.
What changes
You have suspended timber floors with access from below rather than a solid slab.
What changes
Your priority is comfort, not payback.
What changes
You have very poor insulation.
What changes
If this were our house
For a 1930s semi with suspended timber floors
We would not install underfloor heating just because the marketing says it is more efficient. We would only consider it if the ground-floor rooms were already being lifted for a rewire or a new kitchen, or if we were sizing the house for a heat pump and wanted to run the flow temperature as low as it would honestly go.
If neither of those applied, we would put the same money into insulation and slightly oversized radiators. The comfort delta is real but not transformative; the running-cost delta is small on gas. It becomes properly interesting once the heat source changes.
When we'd say no
We would rather lose the sale than take you somewhere the numbers don't stand up.
You are hoping UFH will fix a cold room caused by poor insulation. It will not; you will just pay to heat the room and the floor above it.
You have a solid concrete slab, no other work is planned, and the only case is comfort. The disruption and cost do not stack up.
You are being quoted whole-house electric UFH. Bathroom mats are fine; anything larger will hurt for a decade of energy bills.
You do not have budget for per-room thermostats and a decent manifold. Cheap kit turns a good idea into a system running to the warmest zone.
You are planning to sell within three or four years. You almost certainly won't recover the cost in the sale price.
What most people get wrong
The trade at a glance
A five-step editorial scale, not a rating. Green weight is a gain; grey weight is a cost you carry.
Comfort
Uniform heat across the floor; the closest thing to invisible warmth a house can offer.
Running efficiency (with heat pump)
Low flow temperatures let a heat pump run at four units of heat per unit of electricity.
Running efficiency (with gas boiler)
Modest savings versus large radiators; not the reason to install.
Installation disruption
New screed or lifted floors; days-to-weeks of upheaval unless timed with other work.
Installation cost
Roughly £90–£220 per square metre depending on retrofit method and access.
Future flexibility
Once laid, layout is fixed; a rearranged kitchen means unpicking loops.
What it costs
Pipe, manifold, controls, screed. Cheaper per m² as area increases.
Overlay panels, no excavation. Premium for tricky access.
5–10m² mat, thermostat, tile install. The right tool for small spaces.
Wet system, 8–10 zones, smart manifold. Excludes flooring finish.
Ranges drawn from MCS, EST, HPF and installer-quoted 2025–2026 data. Your home's price depends on access, fabric and specification.
You've got the answer
Underfloor heating is worth considering only if a floor is already coming up, or you're moving to a heat pump. Otherwise, larger low-flow radiators do most of the same job.
You can stop here if you're still deciding. The rest of this page is for readers who have already committed and want to spend the money well.
If you're going ahead
This half of the page is written for the reader who has decided. It reads in the order the decisions come at you.
Which version
Warm water circulating through pipes buried in a screed floor. Slow to respond, quiet, cheap to run, and pairs natively with a heat pump. The default whole-house choice for new builds and extensions.
When we'd choose it
You're pouring a new slab, or lifting a floor to structural level anyway.
The same wet system in a thin panel that sits on the existing floor, raising it by around fifteen to twenty-two millimetres. Slightly less responsive than screed, dramatically less disruptive to install.
When we'd choose it
You want wet UFH in an existing house without excavating, and can live with a small step at doorways.
Thin resistance wire under tile or stone. Fast to warm, expensive per kilowatt-hour to run. Superb in a small bathroom; a regret purchase almost anywhere else.
When we'd choose it
Bathroom or ensuite of about ten square metres or less, and only where warm tiles are the point.
Your house
Every UFH system adds height. In-screed systems in a new build add nothing you notice; overlay systems in a retrofit add a real step. Doors get planed or replaced, skirting comes off and goes back on, and the last stair riser suddenly reads short. Plan for it before you commit.
A large solid-back sofa or a rug over the emitter zone will cook the timber, damage the finish, or simply stop the heat from getting into the room. Engineered timber and tile are fine; solid timber over about eighteen millimetres slows response and voids warranties. The furniture layout is part of the design, not an afterthought.
In use
Heat pumps lose efficiency every degree they have to heat the water above ambient. At around 35°C flow temperature they run near their best; at the 55–65°C traditional radiators are sized for they run at roughly half that efficiency. UFH spreads heat over a floor rather than a panel, so it runs happily at the lower number.
Radiator heat pump installs are entirely possible; the radiators just need to be two to three times larger than the gas-boiler ones they replace.
Each loop needs its own actuator on the manifold and its own thermostat in the room it serves. Skip the per-room controls and the whole system runs to the warmest zone, so the spare room bakes while you shiver in the kitchen.
Good manifolds have visible flow meters you can read at a glance. A cheap manifold saves a few hundred pounds up front and quietly loses a tenth of the system's efficiency for its lifetime.
Installation
Day 1
Clear rooms, lift or prepare the substrate, mark out loop layouts and manifold position.
Days 2–3
Lay insulation, clip down pipe runs, pressure-test loops before anything is covered.
Days 4–5
Pour screed or drop in overlay panels. Screed cures slowly; nobody walks on it for days.
Weeks 2–4
Screed dries; system commissioned in stages at low temperature to avoid cracking. Floor finish laid last.
Commissioning
Balancing per loop, per-room thermostat pairing, printed flow-rate report. Ask for it in writing.
Common mistakes
An undersized manifold or missing flow meters; the system runs, but nobody can prove it is balanced.
One thermostat serving multiple zones, so rooms bake or freeze depending on which one wins.
Solid timber flooring thicker than 18mm laid over the emitter; response times double and the warranty is voided.
Screed heated too fast during first commissioning, leaving hairline cracks that telegraph through the finish.
A bathroom mat wired without an RCD-protected circuit; an electrician's failure that only shows up years later.
The installer
The gap between the best and worst installer on this list of trades is larger than the gap between products. Judge the person, not the brochure.
Maintenance
A wet UFH system is largely maintenance-free once commissioned. Refill and re-inhibit every five to ten years, replace actuators or thermostats if they fail, and keep the manifold accessible; not buried behind kitchen units.
Real questions
Underfloor heating is a comfort upgrade first and an efficiency upgrade a distant second. If a floor is coming up, or a heat pump is on the horizon, the case is strong. If neither is true, we would put the same money into insulation and larger radiators and buy the comfort another way.