We are going to build an attefall house as a complementary dwelling.
We told the architect/designer that we wanted the minimum possible wall thickness to meet the energy calculation.
It is a house measuring 7x4.25 meters with a loft and four meters high, three 1.2x1.2 windows, a patio door with a half window, and an exterior door without a window.
The thickness ended up being 29.1 cm. Is it reasonable to have walls that thick?