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I don't believe there is a regulation distance for non habitable wotsits.

But you shouldn't build over either the pipework or the drainage field.


Another good point. I'm new to septic tanks so hadn't even thought about
'drainage field' implications. The proposed garage would be beyond the
septic tank relative to the house so wouldn't conflict with the input pipe.
I'm thinking along the lines that if I put down a concrete raft foundation
then it wouldn't interfere with any drainage field pipework.


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