Designed for extending a semi detached house.
This is an extension that I gave some free advice on .
This is not how I would approach this house, simple the house had solid block walls and no insulation.
In my opinion the clients who were due to retire would have been better to have spent the money on external cladding and a minimal extension
to increase the thermal performance of the whole house.My approach is to maximize the thermal performance of the existing house then if funds allow move on to next phase.