I'm trying to design the best way of building my house from a low energy point of view. My plan is to double the insulation by increasing the cavity space from 4 to 6 inches and increase attic insulation from 9 to 12 inches, I plan to have all the walls upstairs and downstairs block and have a concrete 1st floor (Ducon) aswell. All the rads will have thermostats and will have zoned heating, will use a condenser burner. the windows are going to have K glass (munster joinery)
Can anyone suggest any better ideas/vendors?