Check with Council
I think it would be prudent to check the local authority use or zoning maps for your area. Depends on which State and local aurthority you're in.
Head into the local council office, go to the planning department, and ask to see the planning scheme. If that's a bit complicated, just ask to see one of the planners.
Often things that appear straight forward and simple end up expensive and complicated, especially if what you're doing gets the neighbours pi**ed off.
That's red tape for ya.