Abstract: The strategic plans of every major Australian city are attempting to direct a substantial proportion of future dwelling requirements within existing urbanised extents. This urban infill or residential intensification is generally intended to be realised in mixed-use nodes (Activity Centres) and along the public transport corridors which connect them (Activity Corridors) – a polycentric city model. In Perth, Western Australia, there has been substantial focus on the nodal development of Activity Centres through the issue of specific state planning policy (Western Australian Planning Commission, 2010). Activity Corridors have received less attention in state policy in Western Australia yet have been identified as a possible means of systematically intensifying habitation and urban activity within the existing extents of sprawling cities. A recent report identified that 100–200,000 new dwellings could potentially be realised from intensifying development in selected land parcels along just seven roadway corridors in Perth. There are metropolitan wide systemic challenges to enabling infill development across all Australian cities such as infrastructure prioritisation, planning restrictions, financing practices, community attitudes and the costs of development and constructing attached housing. In addition the urban intensification of Activity Corridors possesses its own unique site specific constraints and opportunities. Urban Design can play an important role in helping to address some of these general and specific challenges. This research presents a methodology for urban design based research in relation to achieving urban infill along Activity Corridors. Design typologies that emerge as a result of initial application of this methodology are shown with a view toward informing planning and design controls which incentivise appropriate development in these locations.