Insulation regulations on change of use

[Peter luke]

Hi I am hoping to buy a new house in norfolk.
The house house has a shop attached and I am hoping to change the usage into a dwelling to live in while my extended family lives in the main house.

The shop is a double skin construction but I have no idea how thick the cavity is.
The floor is tiled and I have no idea if the floor is insulated but I assume it isn't and I know the ceiling is not insulated (flat roof).

My question is if I want to change the usage to a dwelling do I have to insulate the walls and floor and ceiling and if so how thick does the insulation need to be.

 

[^woody^]

You will need to conform to all the building regulations for dwellings. Part L1b will define insulation requirements, and the thickness will depend on several factors but mainly the type of insulation used.

 

[Nakajo]

I think that A1 to C3 can be done under permitted development - subject to the prior approval process, so you should only be required to meet part L1B requirements for residential change of use.

 

[^woody^]

I think that A1 to C3 can be done under permitted development - subject to the prior approval process, so you should only be required to meet part L1B requirements for residential change of use.

I like this concoction of planning and building regulations that you have in your world.