The building Height Plane (BHP)
15 Clause 30 of LEP 2001 refers to Building Height Planes.
(1) BHP objectives.
The specific objectives of the BHP controls in the mixed-use zone are to:
a) ensure compatibility between development in the mixed use zone and adjoining residential or open space zones, and
b) minimise adverse effects on land in adjoining residential or open space zones in relation to ventilation, views, building separation, solar access and light and to avoid overshadowing of windows, landscaped areas, courtyards, roof decks, balconies and the like.
(2) BHP controls.
A building must not be erected in the mixed-use zone, on land that adjoins or is adjacent to land within a residential or open space zone, if any part of the building will exceed a BHP:
a) commencing 1.8 metres above existing ground level, projected at all points from each of the boundaries of the site which adjoin land within the residential A1, A2, B, D or F zone or open space zone, or
b) commencing 1.8 metres above existing ground level, projected from the centre of any road which separates the land from land within the residential A1, A2, B, D or F zone or open space zone, or
c) commencing 3.5 metres above existing ground level, projected at all points from each of the boundaries of the site which adjoin land within the residential C zone, or
d) commencing 3.5 metres above existing ground level, projected from the centre of any road, which separates the land from land within the residential C zone.
16 Therefore the relevant Building Height Plane for this site is a line projected at 45o 3.5m above the northern boundary (ie the boundary adjoining the residential zone). The proposal's depth varies, with a depth of 29m at the western end and a depth of 12m at the east. The thin part of the building more or less complies with the BHP, while the fat part at the west grossly breaches it. The thin part occupies about 5m of the site's width, while the fat part occupies about 17m, so the non-complying part is in excess of the complying part. (The drawings lack dimensions and are inaccurately drawn, so it is hard to obtain a true picture of the extent of the breach. For example, on the plans the balconies to the 03 apartment living rooms scale 3.5m wide, while on Section A-A they scale as 2.5m wide. If the plans are correct, the breach is greater than the Section A-A indicates.)
17 The applicant submitted an Objection under SEPP 1 to the Building Height Plane. The council's planning expert, Mr G Mossemenear, did not think that the Objection was well founded, while the applicant's expert, Mr M Harrison, an architect, planner and urban designer supported the Objection. While they agreed that the Building Height Plane was a development standard, they were at issue regarding whether, despite non-compliance, the proposal achieved the BHP objectives.
18 Clause 30(1)(a) and (b) above contain the objectives of the Building Height Plane. In Mr Mossemenear's opinion, the proposal does not achieve compatibility with the residential development to the north, given that it is 14-storeys high, while the existing residential is two-storey high and the height limit permits four storeys for any future redevelopment. With a lesser height, he would look more favourably on a breach of the Building Height Plane. As it is, the change in scale is too abrupt. While he agreed that there is no impact from overshadowing and views, he thought that there would nevertheless be an impact from the closeness of such a tall building.
19 Mr Harrison supported the Objection. It appears from his written evidence that he based his opinion on a comparison between the proposal and an alternative proposal that was built exactly to the shape of the Building Height Plane (a triangle), despite the fact that it would not be practical to build a building to that shape. In my opinion, this indicates a misunderstanding of the Building Height Plane. The Building Height Plane is not intended to indicate the shape of a building; it is an envelope within which a proposed building should fit. Any comparisons between a theoretical structure in the shape of the Building Height Plane and the proposal are unsound.
20 I accept Mr Mossemenear's evidence that the proposal does not meet the Building Height Plane's objective in cl 30(1)(a). A 14-storey building built 14m from the common boundary with the residential zone is incompatible with the existing two-storey and future four-storey scale in that zone.
21 The SEPP 1 Objection considers the question whether strict compliance with the development standard is unreasonable or unnecessary. It contains this sentence:
Strict compliance with this development standard would result in the construction of a triangular building as illustrated in Figure 1.
22 This suggests that, like Mr Harrison, the author of the Objection also thought that the Building Height Plane is intended to be the shape of an actual building rather than an envelope into which an actual building is to fit. My comments in paragraph 20 above apply. The Objection goes on to say that
The proposal does not result in any material impacts in terms of privacy, views, solar access, light and ventilation as a result of the breach.
23 I note that the sentence conveniently leaves out the words building separation, which are present in cl 30(1)(b). I do not accept that erecting a 14-storey building 14m from the rear fence of a house has no material impacts. In my opinion, the Objection is not well founded and must therefore fail.