Is Electric Underfloor Heating Worth It in a Bathroom?

A typical mid-range bathroom renovation with electric underfloor heating costs around £7,500, against £7,000 for the same bathroom with no floor heating. For most households that difference is worth paying if the floor is tiled and the room is used first thing in the morning — and not worth paying if you're already keeping a radiator or towel rail that does the job.

What you're actually buying

Electric underfloor heating in a bathroom is a mat or loose cable set into the screed or tile adhesive under the finished floor, wired to its own thermostat. It warms the floor surface, not the whole room, so most installers pair it with a heated towel rail rather than relying on it alone in a cold climate. The cost difference above covers the mat, thermostat, sensor and the extra labour to fit and test it during a Bathroom renovation — it doesn't include running costs, which depend on your electricity tariff and how long you leave it on.

When it's worth it

• The floor is tile, stone or any other cold, hard material. Underfloor heating earns its keep on porcelain or natural stone, where bare feet on a cold morning are the main complaint. On carpet or cork it makes far less difference, since those floors already feel warm underfoot.
• The bathroom is used daily, early, by the whole household. A family bathroom used every morning gets more value from a heated floor than a guest cloakroom used a few times a month.
• There's nowhere sensible for a radiator. Small en-suites and loft or basement bathrooms often don't have a wall run long enough for an adequate towel rail. A heated floor can replace the radiator as the main heat source rather than just adding comfort.
• You're already re-screeding the floor. If the renovation involves changing the New flooring as well as the suite, the marginal cost of adding a mat is lower than retrofitting one later, since most of the labour is in lifting and relaying the floor regardless.

When to skip it

• The existing floor is staying, and the room already has a working radiator or heated towel rail. There's no comfort problem to solve, and the floor would need to be lifted and relaid purely to fit the mat.
• It's a small en-suite or cloakroom used briefly. The room never has time to feel cold if it's only used for a few minutes at a time.
• You're on a tight budget and the suite itself is the priority. A new bath, shower or vanity makes more visible difference to a renovation than a heated floor; if money is limited, spend it on the fixtures and keep the existing heating.

The hidden cost: it's notifiable electrical work

Fitting a mains-powered heating mat in a bathroom counts as electrical work in a room with a bath or shower, which is notifiable under the rules that apply in England and Wales. In practice this means the installer either needs to be a registered electrician who can self-certify the work, or the work has to be notified to building control before it's signed off. Most bathroom fitters either hold the right registration themselves or bring in an electrician for this part of the job — but it's worth asking who is doing the electrical connection and whether they're registered, because an uncertified installation can cause problems later if you sell the house. If your renovation also touches the consumer unit or involves bigger rewiring, our House rewire guide covers what that work typically costs on its own.

Don't expect a VAT break

The 0% VAT rate that currently applies to energy-saving materials — heat pumps, insulation, solar panels and batteries — does not extend to electric underfloor heating in a bathroom. It's a comfort upgrade, not an energy-efficiency measure, so standard VAT applies to the mat, thermostat and installation labour along with the rest of the renovation. Don't let a quote that references a 0% rate for "heating" go unquestioned — check exactly what it's being applied to.

How we work out the figure

We build the cost difference from installer day rates and material prices for a typical mat and thermostat sized to a standard bathroom floor, then check the result against current market prices and real quotes. It's a reasonable starting point for budgeting, not a quote for your specific bathroom — floor size, the state of the existing subfloor and local labour rates all move the number. If you've already got a quote in hand and want to know whether it's reasonable, our "is my quote fair" tool compares it against the same data behind these figures.

The short version: pay for electric underfloor heating when you're already relaying a tiled floor and the room is used daily without a decent radiator. Skip it when the existing heating already works and the floor isn't being disturbed anyway.