I have an internal "box room" i.e. it has no windows. about 2m * 2m on plan. Occasionally used for guests sleeping on a sofabed, mostly used for storing my bikes.
Is the room totally internal with no external walls?
If so then personally I don't reckon it needs one but when you come to sell the default buyer preference is to want a rad in each room and better to have one you turn down and never use than wish there was one where there wasn't.
I have an internal "box room" i.e. it has no windows. about 2m * 2m on plan. Occasionally used for guests sleeping on a sofabed, mostly used for storing my bikes.
Does it need a radiator?