6 The permit does not allow demolition of the existing dwelling. Under the planning controls that now apply to the land a permit is required for demolition. Therefore, I find that a permit is required under the Heritage Overlay for demolition of the existing dwelling.
7 The key question is whether a new permit is also required under the Heritage Overlay for construction of the new buildings. The existing permit was granted under the provisions of the Residential 1 Zone but not the Heritage Overlay.
8 I find that no further permit is required for construction of the buildings. The permit allows development of five dwellings. The presumption of regularity requires that permits should be taken as authorising what they purport to allow on their face without needing to look behind them to ascertain their validity or the adequacy of the decision making process underlying them. If there is any question about a permit, the correct procedure is to apply for a declaration regarding its validity or seek to have the permit cancelled. Otherwise, permits should be regarded as authorising what, on their face, they purport to allow. Any other approach would create uncertainty about a document that creates rights and obligations and that can be expected to be relied upon by various people in various contexts. Public policy requires certainty to attach to such documents.
9 This view is supported by section 28(2) of the Interpretation of Legislation Act 1984, which expressly preserves acts done under the previous planning scheme, in the case of amendments, and preserves rights and privileges acquired or accrued under the previous provisions. Section 28(2) provides: