We've been considering adding a timber garden room since pre covid. We don't have a lot of options given the garden is about 7m wide x 14m long, it will essentially go "at the bottom" but whether it's left or right and the orientation is up for grabs.
Primary usage will be home office, cum-yoga-studio-cum-sleepover-den (incidental overnight use only of course). Would be great if it could be useful 80%+ of the year. Depending how big we go for, an integrated store may be included for tools (DIY and garden), various leftover paints and chemicals, garden furniture etc.
The garden: The left side, especially the bottom corner is fairly shaded by the neighbouring house and en-block garages, and has a different feel based on season (drab and wet in winter, light shade in summer). By contrast, the right side gets good sun, the soil is usually dry to the point of cracking in summer and currently hosts a row of raspberries which don't seem to mind. Clay soil and (neighbours') conifer roots to deal with too.
We are stuck deciding which side to put the structure. The existing shed is on the shady side but has been placed with a good 1.2m around it so it's quite "out" in the garden. Of unknown age it seems to have lasted well. It's hard to visualise anything other than replacing this with the new building, keeping the existing overall footprint but going back towards the borders so we lose no garden from the current position. I'm thinking without much sun it may succumb to damp and other issues associated. On the other hand it will be great in the heat of summer. All 3 days of that.
Putting it on the sunny side will be generally brighter, and will get baked whenever the sun is out. But it's (in my opinion) more in the line of sight from the house but it's hard to visualise since that's currently the open side. It does mean we could put a paved eating area on the shadier side, which would not likely be used outside of summer anyway.