What are the regulations on access and use of buildings?
The Building Regulations – Part M
M1 -- Access and Use of Buildings
Adequate provision shall be made for people to access and use a building, its facilities, and its environs.
M2 -- Adequate provision shall be made for people to approach and access an extension to a building.
M3 -- If sanitary facilities are provided in a building that is to be extended, adequate sanitary facilities shall be provided for people within the extension.
M4 -- Part M doesn’t apply to works in connection with extensions to and material alterations of existing dwellings, provided such works don’t create a new dwelling.