In many cases, a recession angle of about 45° will apply. In these cases the building envelope can achieve a 4.5 m (single-storey) high building element at a setback of 3.0 m, a 7.5 m (two-storey) high building element at 6.0 m setback and 10.0 m (three-storey) high building element at a setback of 8.5 m.
Along the 2(1) - 2(2) zone interface ("transition"), one adds another 3.0 m to the setback in recognition of the need to reduce the building bulk and to maintain the comfort and amenity of residents in the 2(1) zone. However, a minimum recession angle of 45° applies along the transition boundary. The reason for this is that excessive midwinter overshadowing is unlikely to occur due to the additional setback at the transition.
44 There was some dispute as to whether the compass tool and the resulting recession angles have the dual purpose of managing overshadowing and building bulk at the zone interface. Plainly, by decreasing the recession angles from 55° down to 45° (above the horizontal) for sites facing east and west and down to 35° (above the horizontal) for sites facing south and thus shifting buildings away from the zone interface, the compass tool is designed to manage the overshadowing of the Residential Zone. Importantly, when using the recession plane angles derived from the compass tool, one adds another 3.0 m to the setback in recognition of the need to reduce the building bulk and that a minimum recession angle of 45° applies along the transition boundary.