This may be UK regional usage
A loft conversion is the process of turning the roof space of a house into a usable room or rooms. It's not a straight forward task and local Building Control sign off will be required. In many places, depending on design, Planning Consent may also be required. Except for detached properties, Party Wall notice will need to be served.
As our works progress, I'll write up the details here and onward.
We live in a semi. The house next door has been converted into flats. We've served party wall notices to the tenants in the flats (and they've agreed the works) but the no one knows how to contact the freeholder.
We've had our visit from the Building Control department and they're happy. Now we're waiting for a start date from the contractor.