The Rcode is short for residential density codes and is applicable to all residential property in western Australia. If a land has a residential land use, it will have a correlating Rcode on the local government scheme map. You’ll find it on the local government scheme map, or in the local government Intramaps (DO NOT rely on real estate software, it is not always up to date/correct. The LPS prevails, cross check). For example, a residential property in an area with an Rcode of R20 means there is a permitted density of 20 dwellings per hectare in this area. If you consult Part D of SPP7.3 vol 1 (the Rcodes”, you’ll find a table outlining the min and average site area for R20, which is site area minimum 350m2 and an average of 450m2. Both minimum and average need to be complied with, so to subdivide an infill property you need (on paper without any concessions or variations) a lot 900m2 and above.