Twenty five towns, and the buildings each one is actually made of

Base is Exeter, which puts most of Devon inside an hour and a good part of Cornwall and Somerset inside two. Travel inside that range is part of the fixed price rather than a line item added afterwards.

The pages below are grouped by the era of building stock that dominates each town: solid-wall Victorian and Georgian cores with no cavity to fill, inter-war and early cavity suburbs, post-war estates, coastal towns with a strong flat-roof and converted-flat presence, and rural stone and cob construction on the moor and farmland edge. Each page covers what that means for where the building actually loses heat, holds damp or has gone without insulation nobody has checked.

If your town is not listed, it is still worth asking. The list is where the work is, not where the aircraft is allowed to go.