31 In the present case, we consider that if the intent of the parties was that the building not exceed 8 metres in height, the restriction would have been expressed in these terms. There is no point in referring to a wall height when in most cases the external wall height will be less than the overall building height, which must also include the height of the roof. Therefore, although the correspondence to Mr Lampard senior prior to the Council's consideration of the permit application for subdivision referred to "maximum building height" and "the height of the dwelling", by the time that the notice of decision was issued, the appeal was heard and determined by the Administrative Appeals Tribunal and the section 173 agreement was entered, it was clearly the intention of the parties that the 8 metre height referred to "walls" not the height of the building.
32 We do not consider that the findings of the Tribunal in Banyule City Council v Zumpano should lead us to a different conclusion. The provision in Zumpano's case that the Tribunal was called upon to interpret and apply was found in a schedule to the Significant Landscape Overlay which provided that a planning permit is not required for a dwelling unless the height of any part of a wall is more than 8 metres above the natural surface level of the ground directly below it, or any part of the building is more than 12 metres above the natural surface level of the ground directly below it.
33 Zumpano was a case where the original plans of the dwelling showed walls all in excess of 8 metres on a third level. Subsequently, non-compliance with the planning scheme was identified and the plans were changed. The rooms on the third level remained, but instead of external walls visible from the outside the external skin on these walls was deleted and the roof was extended over the walls and the external windows, which now appeared through the roofing material, in the form of a "mansard" roof.
34 The Tribunal found that these walls, that is the stud walls within the "mansard" roof, were walls within the meaning of the overlay. The Tribunal said: