Insulated Garden building/summerhouse

7m x 5m flat grp roof sloping back 4m bifolds in the front black vertical timber cladding, sips (structural insulated panel) walls, joisted roof with 125mm pir insulation throughout. The front will have a 1m overhanging canopy and veranda with possibly composite decking tbc. We have got artistic license so any picture windows or letterbox windows or other features that will add to the design are welcome it will be used as a gym and yoga room