Porch extension and toilet freezing

purpleparrotuk

Moved into new home in October. Previous owner has built a little porch on the hallway and added a downstairs loo. There is no room for a radiator in the hall and it’s always cold. But more of a problem is the loo is freezing.
I have a Honeywell evohome system and the trv is telling me the toilet is 8.5 degrees at the moment. Obviously I haven’t got the radiator turned on in there yet but surely a unheated room should be warmer than this? Especially since it’s only around 3-4 years old? The rest of the house is a 70s build and the rooms vary between 14 and 15 degrees without heating. Do you think the wall insulation has just been done incorrectly? Is there any way of checking?

Gloomendoom

Just turn the radiotor on. Problem solved.

molerat

Any unheated space will get cold in winter ! My front porch and loo is original build with the house but, like yours, is external to the main property so lots of external wall and windows. The loo radiator is usually hotter than those within the main body of the house and the porch is freezing.

Aylesbury_Duck

Why should an unheated room be any warmer than the outside temperature, eventually? If it’s five degrees outside and the room isn’t heated at all, it will gradually cool towards the outside temperature. The rate of cooling might be slowed by proximity to a heated room and that might stop it ever getting to the same temperature as outside, but it will head towards it.

Davesnave

My unheated porch was about the same temperature as yours this morning.

I'm not exactly surprised at that. The rest of the house is well insulated, so it has little chance of gaining heat from anywhere else faster than it loses it overnight.

It's basic physics.