Councils will vary but here the following rules apply here
Under 10 m2 floor coverage requires no permit provided it's not masonry,
Heights apply depending on distance from fence I think it's 1.8 on the fence and if a m or 2 away it's 2.4m high, if you are in suburbia the observatory will need to be setback from the front line of the existing house.
You can actually build a decent observatory with much less floorspace than 10 m2 , mine is about 5 m2 and with a bit of tinkering the whole building slides off the platform, housing the computer etc.
If you do a google search ..... Your council building exemptions ...... You should come up with the rules you need.
To a large degree it does depend on your neighbors, most houses have something that doesn't comply and unless someone complains it goes by unnoticed.
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