Hello everyone,
We hired a architect to draw up plans for our First Floor Addition project here in Sydney. We want to fit our plans into a CDC.
I like to do my own research on a lot of things and reading up the Housing Code (SEPP) became my latest hobby.
One of the discussion points that came up with the architect was the side setback. My understanding is that the side setback is calculated using the "building height at the side boundary of the house" whereas the architect reckons it is is the "max building height of the house". (Assume this is a tile house)
The side setback formula for a lot with 18m-24m width is: side setback = (height at any point - 4.5) / 4 + 1.5
So with my calculation, the side setback = (5.5m - 4.5) / 4 + 1.5 = 1.75m
With my architect's calculation, the side setback = (8.2m - 4.5) / 4 + 1.5 = 2.4m
where 5.5m is 2.5m (ground floor) + 2.5m (first floor) + 0.5m (ceiling gap between first floor and ground)
where 8.2m is the overall height at the highest point of the tile roof
Note that I don't want to have a "step in" between the ground and first floor so the ground and first floor will have the same setback.
Which one is correct? I know it's not that much difference, but we are already restricting our design due to CDC, so every CM counts.