Here is another backyard office that offers you ample space for work or living. The COOBA Backyard Office (7×3) has 18.1 square meters of floor area. You can pick the colors for doors, windows, and other features. According to Inoutside, full installation includes wiring, insulation, and plasterboard. It doesn’t include concrete slab either.
You can build these on any gradient. They have Western red cedar cladding.