Why Your Bathroom Always Feels Cold (And How To Fix It In Scotland)

Why Bathrooms Feel Colder Than Other Rooms

You are not imagining it. Bathrooms have several things working against them at once.

• They are often tucked into the coldest corner of the house, with one or two outside walls and frequently a north-facing window.
• They are full of hard, dense surfaces. Tiles, porcelain and glass take a long time to warm up and feel cold to the touch even when the air is warm.
• They have a deliberate hole in the wall or ceiling for the extractor fan.
• You are usually wet and undressed, so you feel every draught.
• They tend to have the smallest radiator in the house, and it is often hidden under towels.

The Scottish climate does the rest: a long heating season, plenty of wind and damp air. The fix is rarely one thing. It is usually three or four small things added together.

Cold Walls And Floors

Many Scottish homes have solid stone or brick outside walls with little or no insulation, and older timber floors with a ventilated space beneath them. Both pull heat out of a bathroom all day.

Tiles make it feel worse. A tiled outside wall sits close to the temperature of the masonry behind it, so the room feels chilly even with the heating on, and steam turns to water on it the moment you run a shower.

What helps:

• Insulate when the walls are bare. If the room is being stripped for a refit, that is the moment to fit insulated backing boards to outside walls before the new finish goes on. It is a modest extra at that stage and close to impossible later.
• Consider wall panels. Waterproof wall panels feel less cold to the touch than ceramic tiles and give condensation less to cling to, as there are no grout lines.
• Sort the floor. Gaps between old floorboards let cold air straight in. A plywood layer under new flooring seals them. Cushioned vinyl is warmer underfoot than tiles.
• Look up. In a top-floor or loft bathroom, thin or missing insulation above the ceiling is a common cause. It is worth checking around downlights and the fan duct, where insulation is often pulled back and never replaced.

Draughts: The Window, The Fan And The Pipes

A draught you can feel on wet skin makes a room feel far colder than it is. There are three usual suspects.

• The window. Old single glazing, tired seals and rattling sashes leak heat and let wind in. Hold the back of your hand around the frame on a windy day. If the window is past saving, modern double glazing with obscure glass makes a real difference. See our windows page.
• The extractor fan. A basic fan is an open pipe to the outside. If you feel cold air dropping from it when it is off, it has no backdraught shutter (a flap that closes when the fan stops), or the flap has stuck open.
• Pipe holes. Gaps where pipes pass through the floor, the wall or the boxing behind the toilet let in cold air from under the floor. They are easy to seal and nearly always overlooked.

Damp Air Feels Colder

It is tempting to switch off the fan, or block it up, because it lets the cold in. That usually makes things worse. Damp air feels colder than dry air at the same temperature, wet walls lose heat faster, and the mould that follows is a bigger problem than the chill.

The answer is a better fan, not no fan.

• Choose one with a backdraught shutter and a run-on timer or a humidity sensor, so it runs until the steam is gone and then closes.
• Make sure it is ducted to the outside by the shortest route, not left blowing into the loft.
• Keep the door shut while you shower and leave the fan running afterwards.

Scottish building standards expect bathrooms to be ventilated, so if you are refitting the room, check with your fitter or your council's Building Standards team that what you are planning is adequate. Fans must be wired by a qualified electrician.

Is The Heating Big Enough?

A slim chrome towel rail looks good, but it often gives out far less heat than the ordinary radiator it replaced, and less again once it is covered in towels. If your bathroom has never been warm, this is the first thing to check.

• Size it to the room. Heat output is measured in watts or BTUs. A heating engineer or bathroom designer can work out what the room needs, allowing for outside walls and the window, and choose a radiator to match. Taller, wider or double-layer towel radiators give much more heat than a narrow ladder rail.
• Check it is working properly. If it is hot at the bottom and cold at the top, it needs bleeding. If it is the last radiator on the system and always lukewarm, the system may need balancing. A room thermostat in the hall can also shut the heating off before the bathroom has caught up.
• Think about a dual-fuel towel radiator. This runs off the central heating in winter and has a small electric element for a warm towel in summer. The electrical connection must be done by a qualified electrician.
• Consider underfloor heating. Electric underfloor heating under a new tiled floor takes the chill off the surface you stand on. It has to go in during a refit, before the floor is laid.
• Look at the boiler. If every room struggles, the problem is bigger than the bathroom. Our heating page covers new boilers, and any gas work must be carried out by a Gas Safe registered engineer.

Quick Wins You Can Do This Weekend

1. Bleed the bathroom radiator and turn its valve fully up.
2. Take the pile of towels off the towel rail while the room heats up.
3. Seal gaps around pipes and along the skirting with a suitable sealant.
4. Check the window seals and fit draught strip where they have perished.
5. Check the fan flap closes when the fan stops. Clean it if it is sticking.
6. Keep the bathroom door shut so the heat stays in and the steam stays out of the hall.
7. Put down a good bath mat. It sounds trivial, but a cold floor is half of what you feel.

None of these costs much, and together they can be the difference between bracing and bearable. If the room is still cold after all of them, the cause is in the walls, the floor or the size of the heating.

The Lasting Fix: Build The Warmth In

The cheapest time to cure a cold bathroom is when it is already stripped out. With the old suite and wall finish gone, insulation, a plywood floor layer, a properly ducted fan, a correctly sized towel radiator and underfloor heating can all go in without paying twice for labour.

When a designer visits, tell them the room is cold. It changes the advice: where the radiator goes, which wall finish suits an outside wall, and what fan to fit. You can see towel radiators, panels and flooring at our showrooms, and browse ideas on our bathrooms page or the modern bathrooms page.

Most bathrooms are fitted in 3 to 6 days by trusted installers, and all workmanship is guaranteed. We work across Scotland, including Glasgow and Aberdeen. Finance is available from £22 a week, subject to status.

Quick Answers

Why is my bathroom the coldest room in the house?

Usually a mix of outside walls, a draughty window or fan, cold hard surfaces and a radiator that is too small for the room.

Does an extractor fan make a bathroom cold?

It can if it has no backdraught shutter. Fit a better fan. Do not block it, because damp air feels colder and causes mould.

Is a towel rail enough to heat a bathroom?

Only if it is sized for the room. Many slim rails are not, especially once covered in towels.

Are wall panels warmer than tiles?

They feel less cold to the touch and attract less condensation. Insulating an outside wall behind them during a refit helps far more.

Is underfloor heating worth it in a bathroom?

It makes a tiled floor comfortable and helps it dry. It is best fitted during a refit and works alongside a radiator in most rooms.

Can I add an electric heater to my bathroom?

Only one designed for bathrooms and installed by a qualified electrician, as there are strict rules on electrics near water. We do not sell electric heaters, so ask your electrician.