What Is The Minimum Ceiling Height Allowed On Barn Conversion Under Current Building Regs?

Where is this barn, vict? Exact regulations will vary from one authority to the next. However, to make a habitable space you should generally aim for 2.3m (8 feet) ceiling height over at least half of the floor area.

In a typical conversion this allows for quite generous floor space by extending the floor well into the eaves.