Subdividing Land in Western Australia: An Overview
Western Australia has a distinctive planning system that differs from other states in several important ways. The key differences are the use of Residential Design Codes (R-codes) to determine subdivision potential, and the role of the Western Australian Planning Commission (WAPC) in approving subdivision applications.
WA has also seen significant subdivision activity in recent years, driven by strong population growth and relatively affordable land prices compared to Sydney and Melbourne.
Step 1: Understand the R-Code System
In WA, residential density is controlled by the Residential Design Codes (R-codes). Your property's R-code determines the minimum lot size for subdivision.
| R-Code | Minimum Lot Size | Average Lot Size | Typical Use | |--------|-----------------|-----------------|-------------| | R10 | 1,000 m² | 1,200 m² | Low density suburban | | R15 | 600 m² | 700 m² | Standard suburban | | R20 | 350 m² | 450 m² | Medium density suburban | | R25 | 260 m² | 320 m² | Higher density suburban | | R30 | 220 m² | 260 m² | Medium-high density | | R40 | 180 m² | 220 m² | High density | | R60 | 120 m² | 150 m² | Very high density | | R80 | 100 m² | 120 m² | Apartment density |
To find your R-code, check your local council's zoning maps or use the MyPlan WA portal at myplan.wapc.wa.gov.au.
Step 2: Check for Dual Coding
Many WA properties have dual coding — for example, R20/R40. This means the property can be developed at either density, with the higher code applying if certain conditions are met (such as minimum lot size, frontage, or proximity to activity centres).
Dual coding is common in established suburbs and can significantly increase subdivision potential.
Step 3: Check Overlays and Constraints
WA planning overlays that can affect subdivision include:
Special Control Areas (SCAs) — Set by the WAPC for specific areas (e.g., bushfire, coastal, heritage).
Bush Forever Sites — Areas of significant bushland that are protected from development.
Wetlands — Properties near wetlands may have development restrictions.
Heritage Areas — Properties in heritage areas or with heritage listings require heritage assessments.
Bushfire Prone Areas — Properties in bushfire prone areas must comply with the State Planning Policy 3.7 (Planning in Bushfire Prone Areas).
Step 4: Choose Your Subdivision Type
WA has two main types of residential subdivision:
Torrens Title (Green Title) Subdivision — Each lot gets its own freehold title. The most common type for splitting a residential block into two or more separate lots. Requires WAPC approval and a survey plan.
Survey Strata Subdivision — Lots are defined by survey, but share common property (such as driveways or open space). More flexible than Torrens title and often used for grouped dwellings and battleaxe lots.
Built Strata — Used for units and apartments where the lot boundaries follow the building structure.
Step 5: Apply to the WAPC
Unlike most other states, subdivision in WA is approved by the Western Australian Planning Commission (WAPC), not the local council. The local council is a referral body that provides comments, but the WAPC makes the final decision.
The WAPC subdivision process:
- Prepare application — Subdivision application form, survey plan, supporting documents
- Lodge with WAPC — Via the WAPC's online portal
- Referral to agencies — Local council, Water Corporation, Western Power, Main Roads WA, and others
- WAPC determination — Typically 60–90 days
- Conditions of approval — Must be satisfied within the approval period (usually 3 years)
- Clearance of conditions — Submit evidence of completed works and payments
- Survey plan registration — Lodge with Landgate to create new titles
Step 6: Water Corporation Headworks
The Water Corporation charges headworks contributions for new lots connected to the water and sewer system. These are a significant cost:
| Service | Typical Headworks Charge | |---------|-------------------------| | Water | $4,000–$8,000 per lot | | Sewer | $4,000–$10,000 per lot | | Total | $8,000–$18,000 per new lot |
Headworks charges vary depending on the size of the lot and the existing infrastructure in the area.
Total Cost of Subdivision in WA (2025)
| Cost Item | Typical Range | |-----------|---------------| | Feasibility assessment | $750–$1,500 | | Town planner / WAPC application | $3,000–$8,000 | | Licensed surveyor | $4,000–$9,000 | | Civil engineering design | $2,000–$6,000 | | WAPC application fee | $500–$2,000 | | Water Corporation headworks | $8,000–$18,000 | | Local council contributions | $3,000–$12,000 | | Civil works | $8,000–$30,000 | | Legal/conveyancing | $1,500–$3,500 | | Total (2-lot subdivision) | $31,000–$90,000 |
How Long Does Subdivision Take in WA?
A typical 2-lot Torrens title subdivision in WA takes 12–18 months:
- Feasibility assessment: 48 hours
- Application preparation: 4–8 weeks
- WAPC determination: 60–90 days
- Satisfying conditions (civil works, payments): 3–6 months
- Survey plan registration: 4–8 weeks
Start with a Feasibility Assessment
Before spending money on a surveyor or town planner, confirm your WA property's subdivision potential with a professional feasibility assessment.
STN Civil Solutions produces subdivision feasibility reports for any WA address within 48 hours — covering R-codes, overlays, minimum lot sizes, Water Corporation headworks estimates, and a clear feasibility assessment. Reports start at $750.
