External impact of non-compliance with height
12 Clause 17 of LEP 2001 establishes a height limit of three storeys and 12m for the site. It was common ground between the experts that it was possible to design a four-storey building with a 12m height, and that such a building would be acceptable to all experts (though, presumably, it would still require an Objection under SEPP 1). However, the proposal is for a five-storey building (with an additional dwelling at basement level), which clearly exceeds the 12m-limit. While I cannot glean from the evidence the exact height of the building in the latest amendment; given that there are five floors above ground, the variation is likely to be in the order of 3m, or one floor. The question for the Court is whether a variation of the height development standard is justified.
13 The applicant lodged an Objection under SEPP 1 to the height standard. In Mr Mossemenear's and Mr Chambers' opinion, the Objection is not well founded because, among other minor shadows, the result of the additional height is the overshadowing of the living and dining room of the third-floor northern unit in 191-195 Walker Street. Mr Chambers said that, for the proposal to be acceptable, its non-complying elements should not cast a shadow on the living and dining room windows of the third floor apartment between noon and 2pm. Associate Professor Toon did not agree. He said that the apartment would continue to achieve more than three hours of sunlight, that this complied with the RFDC, and that the impact was therefore acceptable.
14 I note for the record that the shadow diagrams prepared by Mr Mills were detailed and informative. Mr Mills' evidence is the best of its kind that I have ever had in a case where overshadowing was the major issue. His clear and informative evidence allowed the Court to come to a decision on the basis of precise knowledge.
15 Mr Mills' diagrams indicate that two apartments on the north side of No 191-195 would be affected by new shadow from the non-complying parts of the proposal (ie those parts that are above the 12m height). They are on the third and fourth floors. In respect of the fourth floor apartment, new shadow falls on the dining room, kitchen and bedroom window. The shadow affects the kitchen and bedroom windows from about 9am to 9.45, when it becomes shadowed by existing development. The dining room window is in new shadow from 10am to about 10.30am, when it becomes shadowed by existing development. In Mr Chambers' and Mr Mossemenear's opinion, this amount of overshadowing was minor, and acceptable despite the fact that it was the result of a non-complying part of the building.
16 As concerns the third floor apartment, the living and dining room windows now receive more than 5 hours of sunlight between 9am and 3pm at midwinter. Existing development overshadows them from about 11 am to about 11.15am; and from about 2.30pm to 3pm. The proposal would cast additional shadow on the living and dining room windows of the apartment for 1 hour and 30 minutes, ie from 12-noon to about 1.30pm. The windows would still remain in sunlight for more than 3 hours and thus comply with the rule of thumb in the RFDC.
17 All the overshadowing on the living room window and almost all of the overshadowing on the dining room window is due to that part of the proposal that is above 12m. The difference for the occupant between a complying and a non-complying proposal is 1 hour and 30 minutes of sunlight. Put another way, if the proposal complied with the height limit, the living and dining rooms would receive sunlight from morning until 2.30pm with a short interruption at 11am. With the non-complying proposal the living and dining rooms would receive sunlight until noon with a short interruption at 11am, be in shadow from noon to 1.30pm and receive sunlight again from 1.30pm to 2.30pm. The dwelling now receives more than five hours of sunlight and a complying proposal would maintain the status quo. A non-complying proposal would reduce it to less than four hours.
18 It is likely that, if the loss of sunlight were caused by a complying development, most experts (and probably most residents) would accept it as reasonable. The question is whether the impact is also reasonable when it is caused by the non-complying elements of the proposal.