In this guide
5. Convert a house (or single flat) to a number of flats, bed-sits or other subdivision
To subdivide a house into multiple units you must obtain planning permission.
If your house is a listed building it is likely you will need listed building consent and you should contact your local planning authority for advice before you start work. Works to a listed building that affect its special historic character without consent is a criminal offence.
If your flat is in a conservation area and your proposals involve an element of demolition then you may need to apply for conservation area consent and you should contact your local planning authority.