Answer
How close to my house can I build a garden room?
It must be detached and behind the front of the house; no fixed minimum gap, but very close raises fire and access points.
In short
A garden room must be detached and sit behind the principal elevation of the house to stay permitted development. There is no fixed minimum gap from the house, but building it very close raises fire and access considerations, and if it is attached it becomes an extension. We design the position to keep it permitted.
A note
General guidance, not advice. Rules vary by site, and Article 4 directions or conditions can change what applies. Check with your local authority and the Planning Portal.
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