10 Other controls include:
- State Environmental Planning Policy - Building Sustainability Index
- SEPP No 55 - Remediation of Land.
- Warringah Development Control Plan.
The evidence
11 Detailed planning evidence was presented by Mr M Edwards, council's development assessment officer and Mr G Goodyer, the applicant's consulting town planner. A number of neighbours expressed their concerns about:
- Excessive bulk and scale of the proposal.
- Likelihood of adverse structural impacts on No 35 Wyndora Avenue.
- Overshadowing of pool at No 31 Wyndora Avenue.
- Insufficient setback and unsatisfactory overlooking opportunities from the elevated deck.
Excessive bulk and scale
12 As part of the assessment of these issues, the planners referred to the planning principle dealing with the extent of demolition and alterations stated in Edgar Allan Planning Pty Limited v Woollahra Municipal Council [2006] NSWLEC 681, where the Commissioner said:
52. A development application to alter and add to a building will be taken to be that relating to a new building when more than half of the existing fabric of the building is demolished. The area of the existing external fabric is to be the surface area of all the existing external walls, the roof measured in plan and the area of the lowest habitable floor.
13 The reference to this principle arises due to the limited extent of demolition of the existing dwelling and in particular, the retention of the ground floor rooms with a 690mm setback to the northern boundary. The planners have substantially agreed with extent of the existing fabric to be retained, except for the following:
- The garage;
- The areas of the dwelling below the lowest floor level;
- The floor area in the dwelling;
- Windows and doors contained within the area of the walls to be retained.
14 On this basis, Mr Goodyer calculates 57% of the existing external fabric is retained and therefore the proposal does not constitute a new building. However Mr Edwards calculates that 43% of the existing external fabric is retained. Consequently his opinion is that the existing house should be entirely demolished and the new house setback from the rear boundary to enable complete (or near) compliance with the applicable built form controls. He also prefers that the rumpus room be removed to achieve better streetscape impact.