"Mike Mitchell" wrote
| By "on a domestic dwelling" do you mean the garage is attached
| to the dwelling ? If so building control will want to be involved.
| But I don't quite see why the council planning bods would be
| interested, as what could happen just by digging a pit?

Building control, not planning. An inspection pit presents issues of
drainage/sump and flammable liquids or gases building up in the pit as well
as the obvious ones of trip / fall hazard.

Owain