6 The relevant application was lodged with the City of South Perth on 5 August 1999. It was an application to construct a second dwelling on the block for "a separate family occupancy". The second dwelling was to be separate from the already existing dwelling and both dwellings would have street frontages. The Council of the City of South Perth took the view that it could not consider the application as the proposed construction was prohibited by its Town Planning Scheme No 5.
7 The applicants accept that the construction of the proposed dwelling would not be in conformity with the R.15 density code which the City says is applicable to their land pursuant to Town Planning Scheme No 5. However, the applicants say that the density code does not, in all the circumstances, have the effect of preventing their application from succeeding. They claim that the City has a discretion to allow the application pursuant to the provisions of the Metropolitan Region Scheme which they claim is still applicable.
8 The applicants concede that if the provisions of Town Planning Scheme No 5 govern the construction of the building on their land, the Council would not have had a discretion to allow the application to be approved because the proposed building would not comply with the density code. However, they say that as their application is in accord with the Metropolitan Region Scheme, a discretion to allow the development does exist because of cl 30 of the Metropolitan Region Scheme.
9 The applicants claim that as their applications have been refused, they have a right of appeal to the Minister pursuant to cl 33 of the Metropolitan Region Scheme.
10 The applicants contend that they originally had had a right to apply to build a duplex on their block pursuant to cl 11.4 of the Uniform Building By-Laws. They say that the town planning schemes which the City of South Perth later introduced did not take away their rights under cl 11 of the by-laws because nothing in the schemes, including the presently relevant scheme No 5, has been inconsistent with their right to construct a duplex pursuant to the building by-laws. The applicants claim that the 1989 Town Planning (Buildings) Uniform General By-Laws have succeeded the earlier by-laws (now repealed) and that their rights under the original by-laws still prevail."