Underfloor heating in Cardiff

Postcode districts: CF10, CF11, CF24
Nearby: Penarth, Caerphilly and Barry
Guide price: £650–£2,300
Typical time on site: 1–2 working days (added to a fit)
Water: Moderately hard across most of South Glamorgan
Survey: Free, at your home

What does bathroom underfloor heating cost in Cardiff?

For Cardiff, our guide range for bathroom underfloor heating is £650 to £2,300 including VAT. Labour costs in Wales put local prices at about 7% below the UK guide figure. The figure depends on the size of the room, whether anything moves, and the products you pick.

Typical

Electric mat

£650–£1,400

Insulation board

Electric, larger room

£1,100–£2,000

Electrician sign-off

Wet system

£1,400–£2,800

Pipes linked to the heating

Guide prices for Cardiff including VAT. Your itemised written quote after the free survey is the price that counts.

Working in Cardiff

We cover every part of Cardiff, including CF10, CF11 and CF24, and nearby Penarth (2.9 miles) and Caerphilly (6.7 miles).

Cardiff is a big place with every kind of home, from terraces to flats to new builds, so we never price from a photo alone. Whether your Cardiff bathroom is a small en-suite or a large main bathroom, the mat is sized to the open floor, not the whole room. If your Cardiff bathroom has a cold tiled floor and no room for a bigger radiator, an electric mat under new tiles is the simplest answer.

Water across much of South Glamorgan is moderately hard. Mid-tone grout and matt tiles hide the odd water mark better than dark grout and high gloss. Hardness varies street by street, so check the figure for your postcode with your water supplier.

What the job includes

Insulation boards over the subfloor, so heat goes up into the tiles rather than down into the joists or screed
A check of the floor construction, the room's heat loss and where the thermostat and supply will go
Bringing the system up to temperature gradually once the adhesive and grout have cured
For wet systems, pipes in low-profile boards or screed connected to a manifold or single-zone kit, with any boiler work done by a Gas Safe registered engineer

Decisions to make first

Floor heating and towel rail

Underfloor heating warms the room; a towel rail dries towels. Many bathrooms have both, and a dual-fuel rail keeps working in summer when the boiler is off.

Electric or wet

Electric is cheaper to install and quick to lay in one room. Wet costs more upfront but is usually cheaper to run where it is fed by a gas boiler or heat pump.

Rules that apply in Wales

In Wales, the Welsh Part P also makes a new underfloor heating circuit notifiable, and it covers more bathroom electrical work than the English version. A registered electrician handles the notification.

More about underfloor heating

Underfloor heating in Cardiff: questions

How much should I budget for bathroom underfloor heating in Cardiff?

Bathroom underfloor heating in Cardiff usually costs £650–£2,300 including VAT. Room size, layout changes and your choice of products move the figure within that range. The free survey gives you an itemised quote, fixed in writing once the details are agreed.

Do you cover CF10 in Cardiff?

Yes. We cover all of Cardiff, including CF10, CF11 and CF24, and nearby Penarth, Caerphilly and Barry. Survey visits are free and arranged at a time that suits you.

Is the water hard in Cardiff?

Who handles building control for bathroom underfloor heating in Cardiff?

Building control for Cardiff is handled by the local council or an approved inspector. If your job needs sign-off — for example a new circuit, new drainage or a new extractor where there was none — we tell you at the survey and handle the notification as part of the work.

Is electric underfloor heating expensive to run in a bathroom?

Running cost depends on the heated area, the insulation under the mat, how long it runs and your electricity tariff. As an example, a 150 W per m² mat covering 3 m² draws 450 W, so two hours a day uses about 0.9 kWh. A timer and floor sensor stop it running when nobody is using the room.