Ground screw foundations laid, then the base frame is fixed in place. The floor is insulated and damp proofed then the walls are erected on top of the base. The building is fully wrapped in an insulating foil membrane, plus a waterproof breathable membrane, then the single piece rubber membrane is applied to the roof.
The doors and windows are installed ready for the internal finishes and final external cladding.
Internally the room is fully insulated, floored, painted and decorated and all electrics completed. General finish, sign off