Do you need building regs for an attic conversion?
Also to know is, do you need planning permission for attic conversion?
Planning permission is not normally required. A loft conversion for your house is considered to be permitted development, not requiring an application for planning permission, subject to the following limits and conditions: A volume allowance of 40 cubic metres additional roof space for terraced houses*
Thereof, what are the regulations for loft conversions?
That said, a loft conversion falls under permitted development and does not require planning permission as long as it meets the following conditions: The new loft space won't be larger than 40 cubic metres for terraced houses and 50 cubic metres for detached and semi-detached houses.
Nearly all internal works such as loft conversions, garage conversions, new staircases, bathrooms, kitchens, or rewiring, do not require planning permission. But, do check if you want to do anything to a listed property or you live within a Conservation area.