Also there are BS 7671 general requirements (e.g. 132.12) for accessibility of electrical equipment for operation, inspection, testing, maintenance, repair and so on - no specific numbers, but a bit together with a bit of common sense inform maintenance/safety procedures etc. (E.g. if there was a policy of taking IR pictures of DBs under load with their covers off,  and H&S policy required two people to be present, then there would have to be sufficient space to do that safely).

Also building regs might have a say where the occupants might reasonably require access (part M) - probably more likely for a domestic (AD M suggests specific heights).

   - Andy.

I always considered up against the ceiling, over the toilet in a pokey cloakroom to be the optimal position!

I like it (CU/DB) under the stairs at the tightest spot it will fit into for a domestic house.

I like it (CU/DB) under the stairs at the tightest spot it will fit into for a domestic house.