Do I need planning permission for a Loft Conversion?

Most loft conversions do not need planning permission as they are considered to be permitted developments.

Some examples that do are:

• You live in a conservation area
• Your house has already been extended to its limit of 15% of the original size
• The loft conversion will make more than two habitable rooms
• The loft conversion will change the appearance of the outside of the house
• The volume of the extended roof exceeds 40 cubic metres for a terrace or 50 cubic metres for a semi detached or detached house.
• The new room constitute a change of use such as a new office

Please see the following loft conversion planning PDF provided by the Government Planning Portal