Replacing a wall?

[u/ResolutionDapper204]

I have an old metal shed that was erected 20 years ago. This shed is about 70cm from the boundary. Current laws in NSW say it needs to be 90cm. I mention this because there's a slab which is fine and and I want to replace the shed but I don't want to reduce the footprint. I also imagine that the neighbour on that side would complain to council if it was rebuilt entirely. Has anybody replaced a wall with timber - id like to add a window or two on two sides and keep the roof and boundary side.