Subdivision in Eastern Perth: City of Swan, City of Kalamunda & Shire of Mundaring — 2026 WA Council Guide

Overview

Eastern Perth's three councils — the City of Swan, the City of Kalamunda, and the Shire of Mundaring — cover the most geographically diverse subdivision market in the metropolitan area. Swan is Perth's largest-area metropolitan council, encompassing both established western suburbs like Midland and Guildford and the rapidly developing eastern growth corridor that includes Ellenbrook, The Vines, and a pipeline of new precincts. Kalamunda and Mundaring, sitting immediately to the east on the Darling Scarp, are hill councils where rural-residential lot creation, bushfire overlays, and water servicing constraints define what is and is not possible for subdivision.

The common thread across all three councils is the WAPC's central role as subdivision decision-maker — and the increasing weight that State Planning Policy 3.7 (Bush Fires) carries in determining subdivision outcomes in the eastern hills. Whether a landowner in Swan is navigating a District Structure Plan for a new greenfield release or a Mundaring property owner is seeking to create a rural lot in the Darling Range, an understanding of SPP 3.7 and Bushfire Attack Level (BAL) ratings is essential before any subdivision planning begins.

Eastern Perth's Planning Landscape

Eastern Perth's planning environment is shaped by three distinct forces that do not apply to the same degree in any other part of metropolitan Perth. First, the City of Swan's rapid growth has created a complex, layered planning system where different precincts operate under different structure plans, local development plans, and zone frameworks — all of which must be navigated before a subdivision application reaches the WAPC. Second, the Darling Scarp, which forms the eastern boundary of the metropolitan area in Kalamunda and Mundaring, imposes physical and policy constraints on development that have no equivalent in the coastal or northern suburbs. Third, the water servicing boundary maintained by the Water Corporation defines the geographic limit of reticulated water supply — and properties outside this boundary face a substantially higher barrier to subdivision approval, regardless of their R-code or land area.

The DPLH's strategic planning for eastern Perth recognises these constraints by designating much of the Darling Range in Kalamunda and Mundaring as Rural or Rural Conservation zone — zones where residential subdivision is either tightly restricted or effectively prohibited. The residential growth that does occur in the eastern corridor is directed to Swan's structure-plan-guided precincts, where the full suite of urban services can be delivered efficiently.

City of Swan

The City of Swan operates two quite different subdivision markets. In its established inner suburbs — Midland, Guildford, Middle Swan, Jane Brook — subdivision activity mirrors the pattern seen across much of suburban Perth: medium-density R-code designations (typically R20–R40), ageing housing stock on 700–900m² lots, and a steady flow of two-lot survey-strata applications. The 2024 R-code minimum reductions have expanded the range of viable lots in these areas, and subdivision activity has increased accordingly as owners recognise the feasibility opportunity.

In Swan's growth corridors — Ellenbrook, Brabham, Dayton, and the newer precincts to the north and east — subdivision is a fundamentally different exercise. These are greenfield precincts governed by WAPC-endorsed District Structure Plans and Local Structure Plans. Individual residential lot creation in these areas is driven by landowners and developers who have already obtained structure plan endorsement and are now moving through the formal WAPC subdivision approval process to create individual freehold lots for sale. The lot sizes in Swan's growth areas are typically in the 375–600m² range for standard residential lots, reflecting R20–R30 designations under the relevant structure plans.

A significant planning milestone for Swan in 2024 was the City's resolution in March 2024 to advertise Draft Local Planning Scheme No. 18. This new scheme is designed to normalise the planning framework across Ellenbrook and surrounding areas, where much of the existing planning has been conducted under a Special Use Zone (SUZ) framework that coordinated subdivision and development through structure plans. As most of the subdivision and development activity in Ellenbrook is now complete or well advanced, the SUZ is being phased out in favour of standard residential zone designations. In July 2024, the WAPC also approved an amendment to the North Ellenbrook (West) District Structure Plan, adding a new parcel to the plan and extending the development pipeline for that precinct.

Ellenbrook and The Vines: Structure Plan Framework

Ellenbrook is one of Perth's largest and most recognisable master-planned communities, developed over several decades under a series of WAPC-endorsed structure plans. The Ellenbrook Town Centre, Ellenbrook Village, and the various residential precincts that surround them were all created through a structure plan-to-subdivision pipeline that is the template for greenfield residential development across WA. For property owners within Ellenbrook, the most relevant planning document is now the Ellenbrook Local Area Plan (adopted April 2023, valid for five years) and the transitional provisions of Draft LPS No. 18.

The Vines, a prestige residential and golf community in the Upper Swan area, operates under its own local structure plan and features larger lot sizes than standard Ellenbrook-style residential precincts. Lots in The Vines typically range from 500m² to over 2,000m², and the R-code designations in the more recent stages allow for some lot sizes at the lower end that are potentially splittable as the community matures. However, the prestige character of The Vines and the lot minimum requirements under the applicable structure plan mean that subdivision opportunity within the existing community is limited to the largest existing lots, and any application would need to demonstrate consistency with the structure plan framework.

City of Kalamunda

The City of Kalamunda operates two very different planning environments. In its lower western suburbs — High Wycombe, Forrestfield, and Maida Vale — the planning context is essentially suburban, with R-code designations in the R20–R40 range and subdivision feasibility driven by the same lot size and R-code factors that apply across metropolitan Perth. These areas are connected to the reticulated water supply network and do not face bushfire overlay constraints that preclude subdivision. For owners in High Wycombe and Forrestfield, the 2024 R-code minimum reductions have expanded the range of viable two-lot subdivisions, and a growing volume of applications reflects this opportunity.

In the hill suburbs — Lesmurdie, Gooseberry Hill, Kalamunda townsite, Walliston, and Pickering Brook — the planning environment is dramatically different. These areas are characterised by larger rural-residential lots, typically in the R2 to R5 range, where minimum lot sizes are measured in thousands of square metres rather than hundreds. An R2.5 designation, for example, typically requires a minimum lot area of 0.4 hectares (4,000m²). At these densities, the ability to create new lots from an existing parcel depends on the parcel being significantly larger than the minimum — and on the absence of BAL-FZ or BAL-40 bushfire ratings that effectively prevent new dwellings from being created, regardless of lot size.

Kalamunda's Darling Range Master Plan provides the broader strategic framework for development in the hills. This plan recognises the environmental sensitivity of the Darling Scarp and the limitations imposed by bushfire risk, water availability, and steep terrain. New residential lot creation in the hills area is generally limited to larger rural-residential parcels where the BAL assessment allows for a habitable dwelling and where the parcel has sufficient area to meet the minimum lot size for the applicable rural-residential zone.

Shire of Mundaring

The Shire of Mundaring is WA's most constrained metropolitan council for residential subdivision. The combination of predominantly rural and rural-residential zoning, high bushfire risk across most of the shire, and limited reticulated water infrastructure means that new residential lot creation is a genuinely difficult exercise in most parts of the shire. This is not a council where a standard two-lot suburban subdivision is common — the planning framework does not support that type of development across most of Mundaring's land area.

Where subdivision does occur in Mundaring, it typically involves one of two scenarios. The first is the creation of a second rural-residential lot on a large existing parcel — for example, a 10-hectare rural property being split into two 5-hectare lots, provided that both resulting lots meet the minimum area for the rural-residential zone and both can be sited with a habitable dwelling that achieves an acceptable BAL rating under SPP 3.7. The second scenario involves properties on the edge of the townsite of Mundaring itself, where the planning scheme designates some land at standard residential R-codes and where subdivision can proceed on a suburban basis, subject to servicing being available.

The townships of Glen Forrest, Chidlow, and Parkerville contain some residential-zoned land at standard R-codes, but these are small pockets within an overwhelmingly rural context. Owners in these towns should check the specific zone and R-code applicable to their lot before assuming that suburban subdivision norms apply.

Bushfire Overlay (BAL) and Subdivision in Eastern Perth

State Planning Policy 3.7: Planning in Bushfire Prone Areas (SPP 3.7) is the dominant constraint on subdivision across eastern Perth's hills councils. SPP 3.7 requires that any subdivision application for land in a designated bushfire-prone area be accompanied by a Bushfire Attack Level (BAL) assessment — a site-specific assessment of the fire risk faced by a proposed dwelling on each proposed lot. The BAL system assigns one of six risk categories to each lot, ranging from BAL-Low (minimal risk) through BAL-12.5, BAL-19, BAL-29, and BAL-40, to BAL-FZ (Flame Zone — the highest risk category).

Water Corporation Servicing Constraints

The Water Corporation's reticulated water supply network defines a servicing boundary within metropolitan Perth. Properties within this boundary can connect to reticulated water supply as a condition of subdivision approval. Properties outside the boundary must demonstrate an alternative potable water supply — typically a combination of rainwater tank storage and groundwater bore — that meets the WAPC's minimum standards for a habitable dwelling. This is a significant additional cost and complexity for rural subdivision applications in Kalamunda and Mundaring.

Even within the Water Corporation's servicing area, the cost of extending water mains to serve a proposed rear or battle-axe lot can be substantial. The Water Corporation charges contributions toward the cost of main extensions, and in some areas of eastern Perth, the distance from existing mains to a proposed lot can make the extension cost economically prohibitive. A pre-application enquiry to the Water Corporation — confirming the availability, location, and cost of water servicing for the proposed lots — is an essential step before committing to subdivision planning costs in any part of eastern Perth.

2026 Outlook

Eastern Perth's three councils present starkly different outlooks for subdivision in 2026. Swan's established suburbs will see continued steady infill subdivision activity driven by the 2024 R-code minimum reductions, while Swan's growth precincts will continue delivering large volumes of new lots through the structure plan pipeline. In Kalamunda and Mundaring, the outlook is more constrained: bushfire risk, limited reticulated water servicing, and predominantly rural zoning will continue to restrict the volume of subdivision approvals, and the WAPC's application of SPP 3.7 is unlikely to become more permissive in the face of ongoing fire seasons.

• Swan LPS No. 18 gazettal: The finalisation of Draft LPS No. 18 will simplify planning for remaining development opportunities in Ellenbrook and surrounds, and is expected to be completed through 2026 following public consultation and WAPC/Minister review.
• Kalamunda lower suburbs opportunity: High Wycombe and Forrestfield are emerging as genuinely viable two-lot subdivision markets as the 2024 R-code minimum reductions take effect and housing demand in the foothills remains strong.
• BAL assessment costs rising: As more properties in eastern Perth come within bushfire-prone areas following vegetation assessments, the cost and complexity of obtaining a BAL assessment — a prerequisite for WAPC subdivision approval in these areas — is increasing. Qualified bushfire practitioners are in demand across Perth and regional WA.
• Mundaring rural lot demand: Rural-residential properties in Mundaring and the Darling Range continue to attract strong demand from lifestyle buyers, but constrained supply of new lots means existing larger parcels carry a premium that is beginning to make some subdivision proposals viable that would not have stacked up three years ago.