- Residential zone (at R20): smallest new lot 450 m² and 10 m frontage.
- Residential zone (at R20): up to 8 m high and 2 storeys.
- Residential zone (at R20): front setback 6 m, side 1.5 m and site cover 50%.
- Example block: 15 Waddell Road, Palmyra, 1,079 m² in the Residential zone.
- Drawn there: knock-down rebuild and side-by-side pair.
- Left out: single-storey row of 3, two-storey row and four-home row, each with its reason.
- People within 25 km: about 1.70 million.
Main residential zones
Western Australia's numbers, the same across the state. Your block's own zone and overlays come up when you check its address.
| Zone | Smallest new lot (a house) | Frontage | Height | Storeys | Front setback | Side setback | Site cover |
|---|---|---|---|---|---|---|---|
| Residential zone (at R20) | 450 m² | 10 m | 8 m | 2 | 6 m | 1.5 m | 50% |
Rules read on 23 October 2026: Residential Design Codes Volume 1 Version 3 published 10 April 2026; Volume 2 Version 4 published 10 April 2024; WAPC Operational Policy 2.2 (May 2024; operational 31 May 2024). Clauses: R-Code This lot's R-Code sets its numbers. It wasn't typed or couldn't be read, so the R20 numbers are drawn only as a stand-in..
A real block in Perth: 15 Waddell Road, Palmyra
The lot is 1,079 m² in the Residential zone. What the design engine drew on it:
- Knock-down rebuild: 1 home, 1 storey, 4 bedrooms, about 225 m² each
- Side-by-side pair: 2 homes, 2 storeys, 3 bedrooms, about 185 m² each
What it left out, and why:
- Single-storey row of 3: Lot 2's site is 309 m². At R20 no home's site can be under 350 m², and the R-Codes allow at most 5% under (Part D P1.1.2). So fewer homes fit here.
- Two-storey row: Lot 2's site is 309 m². At R20 no home's site can be under 350 m², and the R-Codes allow at most 5% under (Part D P1.1.2). So fewer homes fit here.
- Four-home row: A row of 4 needs at least 25 m of street frontage (4 lots of at least 5.5 m). This block has 22.35 m of street frontage.
Designs drawn
Knock-down rebuild, Side-by-side pair, Single-storey row of 3, Two-storey row and Four-home row: each on the real lot, checked against its zone.
Check my address free See what fits
Agent reports: WA · Design brief
Last updated: 14 November 2026. Guide only. Confirm all results with a council planner before you rely on them.