Relevant Boundary Definition and Requirements

For a boundary to be a relevant boundary it should coincide with, be parallel to or be at an angle of not more than 80° to the side of the building (see Diagram 5.2). A relevant boundary may be – (a) the actual boundary of the premises on which the building is located; (b) the centre line of a road, river, canal or railway which adjoins the actual boundary; or (c) a notional boundary established where two or more buildings (one of which is of Purpose Group 1, 2 or 5) are to share the same site. A notional boundary should be assumed so that both buildings comply with the space separation distances required by this Section. Where a notional boundary is to be established and one of the buildings is an existing building, that building should be treated as if it were a new building.