Can my property be subdivided?

Every residential lot in Perth carries a density code from the WA Residential Design Codes (State Planning Policy 7.3) — R2 through R160. The code is set by your local government's town planning scheme, not by the state, and it is the first thing to find out, because it fixes the minimum and average lot area you have to hit. An 1,100 m² block at R20 is a comfortable two lots. The same block at R12.5 is one lot, and no amount of clever design changes that.

The table below is Table D of the R-Codes Volume 1 — the site area requirements. It is the same table this tool checks every Perth listing against each morning.

Plenty of Perth lots are coded twice — R20/40, R20/50 — and some three times, like Cockburn's R30/40/60 in Hamilton Hill. The higher number is real but conditional: the scheme text attaches requirements before you can use it, and those conditions belong to the local government, not the state. Common ones are sewer connection, a minimum lot area larger than Table D's, frontage to a particular street, a structure plan being in place, or amalgamation with a neighbour.

This matters more than anything else on the page, because the gap between the halves is usually the difference between two lots and four. If your code has a slash in it the uplift is worth chasing — and worth confirming in writing before you pay for anything.

Yield is not lot area divided by the minimum. It is divided by the average, and then every resulting lot must still clear the minimum on its own. At R20 that means an average of 450 m² per lot with no lot under 350 m².

A subdivision almost always has to work around the dwelling already there. Three outcomes, in rough order of how often we see them:

• Retain and split behind. The house stays on the front lot and a new lot is created at the rear, with a driveway past the side of the house. Cheapest, and the reason side setbacks and the width of that side strip decide so many deals.
• Retain and split beside. Works on a corner or a very wide frontage, where both lots can front a street directly. The cleanest result when it fits.
• Demolish. Frees the whole site to be designed properly and usually yields the most lots, and you give up the house and any rent it was earning. Sheds and small outbuildings under about 30 m² generally do not change the answer; a garage, granny flat or pool does.

Frontage is the measurement along your street boundary. Up to R25 Table D sets a hard minimum per lot — 10 m at R20, 8 m at R25. At R30 and above it sets none at all, which does not mean zero: the practical floor becomes the narrowest strip that can legally carry a vehicle crossover, so a lot still needs width for its driveway, its crossover, and the verge trees and services already in it.

Two frontage traps worth knowing:

• Splitting the frontage in half rarely works. A 20 m frontage at R20 gives two 10 m lots exactly on the minimum — before you account for the existing crossover, a power pole, or a street tree the council will not let you remove.
• Corner lots have two frontages and usually a truncation at the corner. That is normally an advantage: two street frontages can mean two lots with direct access and no battleaxe leg at all.

If a new lot does not touch the street it needs a legal way in. Under WAPC Operational Policy 2.2 that access has a minimum width, and every square metre of it is land the rear lot has to count toward its own area.

Why the access leg counts twice

A 4 m leg running 25 m down the side of the house is 100 m² of land. That land counts inside the rear lot's area, which is exactly why Table D sets a separate, larger minimum rear lot figure — 450 m² at R20 against a 350 m² ordinary minimum. Then it has to be built: crossover, paving, drainage, and often a retaining wall.

Three variants you will meet:

• Battleaxe. The leg is part of the rear lot's title. Full control, full area penalty, green title outcome.
• Common property. The driveway is owned jointly by the lots that use it under a survey-strata scheme. Less area penalty per lot, but you get a strata scheme and shared management with it.
• Right of carriageway. An easement over someone else's land. Occasionally the only option; expect the council and the WAPC to take more convincing.

Both produce separate, sellable titles. Which one you choose changes the rules you are tested against, so it is a planning decision, not a paperwork one.

Zoning tells you what the land is for. Overlays and constraints tell you what is wrong with it, and they override an otherwise perfect R-Code every week. None of these necessarily kills a subdivision — most add time, conditions and work — but they all have to be found before you buy, not after.

Perth subdivision runs through the Western Australian Planning Commission, not your council — the council is a referral agency with a great deal of influence, but the WAPC issues the approval. The sequence is almost always this:

Who signs what, and roughly how long each step takes. Treat every duration as an order of magnitude for a straightforward two-lot green title subdivision in the Perth metro area — a complicated site, a strata scheme, or anything that ends up at the State Administrative Tribunal runs longer.

WAPC approval arrives conditional, with a sunset date — commonly three or four years for an infill subdivision. Clearing the conditions is the real project:

• Services to each lot. Water and sewer through the Water Corporation, power through Western Power, plus telecommunications and gas where required. The single biggest source of unexpected work, especially where a main has to be extended.
• Crossover and driveway built to council specification, the old crossover removed and the verge restored.
• Drainage. On-site stormwater disposal sized to the council's standard.
• Earthworks and retaining so each lot is usable and drains correctly.
• Demolition or building modification where a structure crosses a new boundary or breaches a setback.
• Contributions. Development contributions where a scheme imposes them, and public open space — cash in lieu, on smaller infill subdivisions.
• Management plans for bushfire, contamination or heritage, where an overlay triggered one.

If the WAPC refuses, or imposes a condition you cannot live with, there is a right of review to the State Administrative Tribunal within 28 days. It is a genuine option and a used one — but budget time and a planning consultant for it.

How do I find out if my property can be subdivided?
Start with four things: the R-Code in your local government’s town planning scheme, your lot area from the certificate of title, your street frontage, and whether a compliant driveway can reach the rear of the block. If the area clears the Table D average for your code and the access works, you have a candidate — then check the overlays. The free check at the top of this page tests those four against the state cadastre and planning layers and emails you the result.

What is the minimum block size to subdivide in Perth?
There is no single number, because it depends on your R-Code. At R20 — the most common code in established Perth suburbs — two lots need an average of 450 m² each, so roughly 900 m², and a rear battleaxe lot has to reach 450 m² including its access leg. At R30 the average drops to 300 m², and at R12.5 it rises to 800 m².

Can I subdivide and keep my house?
Usually, and it is the most common infill outcome in Perth: the house stays on the front lot and a new lot is created behind it, with a driveway running past the side of the house. It works when the side strip is wide enough for a compliant access leg, the house does not cross the new boundary or breach a setback, and the rear lot still clears the minimum rear lot area with the leg included.

Who approves a subdivision in Western Australia?
The Western Australian Planning Commission, not your local council. The council is a referral agency — influential on the conditions, but not the decision-maker — and so are the servicing authorities. Landgate issues the new titles once the conditions are cleared.

How long does a subdivision take in Perth?
The WAPC has 60 to 90 days to decide the application, but clearing the conditions is the long part: six to eighteen months is typical for a straightforward two-lot infill subdivision, then another two to four months for the survey, the deposited plan and the new titles. Budget eighteen months to two years end to end.

What are the main stages of a Perth subdivision?
Check the zoning and the site, get a feature survey and a concept plan, talk to the council, lodge the application with the WAPC, receive conditional approval, clear the conditions, then survey and lodge the deposited plan so Landgate can issue the new titles. Clearing the conditions — services, crossover, drainage, earthworks and retaining — is by far the longest stage.

What does a dual density code like R20/40 mean?
The lot is coded twice, and the higher density is available where the local government’s scheme text conditions are met — commonly sewer connection, a larger minimum lot area, frontage to a particular street, or a structure plan being in place. The uplift is real and often doubles the yield, but it is conditional, and the conditions are the council’s, so confirm them in writing before you buy.

What is the difference between green title and survey-strata?
Green title gives you the lot outright to the boundary, with no shared land and no ongoing obligations beyond rates, but each lot needs its own access or a battleaxe leg. Survey-strata gives each lot a surveyed title plus a share of common property, which is how a shared driveway is normally handled, in exchange for a strata company and shared maintenance. Green title usually sells for more.

What is a battleaxe block?
A lot behind another one, reached by a narrow leg of land running out to the street and forming part of its title — a shape like an axe head on a handle. The leg must be at least 4.0 m wide up to R40 and 3.6 m at R50 and above, and its area counts toward the rear lot’s own, which is why Table D sets a larger minimum for rear lots than for ordinary ones.

Can a subdivision be refused even if my block is big enough?
Yes, and area is one of the commoner things to clear while something else fails. Insufficient frontage, no room for a compliant driveway, a house across the proposed boundary, a heritage listing, bushfire requirements, no sewer connection, a significant tree, or an easement through the middle of the new lot will all do it. If the WAPC refuses there is a right of review to the State Administrative Tribunal within 28 days.