Subdividing and Building on The Same Block in Perth: What You Need to Know Before You Start

 

subdivision drafting in Perth - Domestic Drafting Service

Some Perth property owners sit on blocks large enough to subdivide and still have room to build. It sounds like a straightforward way to make better use of land, and in many cases it is. But the two processes don't always run as neatly in parallel as people expect.

Can You Actually Do Both at The Same Time?

Yes, but with conditions. Subdivision and development approval are separate processes in WA, managed by different authorities. Subdivision goes through the Western Australian Planning Commission (WAPC), while development approval for any new dwelling sits with the local council.

You can lodge both applications concurrently, but approval of one doesn't guarantee the other. A block might get subdivision approval and still face issues with the proposed build due to setbacks, site coverage or access requirements on the newly created lot.

What Determines Whether Your Block Can Be Subdivided?

The starting point is your zoning under the local planning scheme. In Perth, the R-Code zoning on your property sets the minimum lot size for each new lot created. Common examples:

• R20 zoning: minimum 350sqm per lot (average 400sqm)
• R25 zoning: minimum 300sqm per lot
• R40 zoning: minimum 180sqm per lot, which opens up more options on mid-sized blocks

A surveyor confirms the lot dimensions, but subdivision drafting in Perth professionals prepare the plans that go to WAPC showing how the land will be divided, where boundaries sit, and how each lot will access the street.

The Sequencing Question

Most owners want to know: do you subdivide first, then build, or can you build while subdivision is being processed?

Approach	What It Means
Subdivide first, then build	Cleaner title structure, simpler financing on the new lot
Concurrent lodgement	Saves time but requires careful coordination between approvals
Build first, then subdivide	Possible but can create complications with existing structures on proposed lot boundaries

The most common issue with concurrent applications is that the subdivision plan and the development drawings need to be consistent. If they show different boundary positions or access points, one or both applications will need to be amended. That back-and-forth adds weeks.

What the Drafting Process Actually Involves

The Subdivision plans in Perth need to show more than just a line through the middle of a block. WAPC requires:

• Proposed lot boundaries with dimensions and areas
• Existing structures and how they relate to new boundaries
• Easements, rights of way and service connections
• Street access for each new lot

Getting these details right the first time matters. A plan that doesn't account for an existing shed sitting too close to a proposed boundary, for example, will come back with conditions that need resolving before titles can be issued.

Working Out the Build Feasibility Early

Before committing to either application, it's worth checking whether the new lot can actually support the build you have in mind. A subdivision draftsman in Perth can overlay a proposed dwelling footprint onto the subdivision plan to test whether setbacks, open space requirements and vehicle access all work before anything is lodged.

Planning Your Subdivision and Build with Domestic Drafting Service

Domestic Drafting Service prepares subdivision and residential drafting documentation for Perth property owners working through both processes. They coordinate the documentation across subdivision and development applications, helping to keep both on track without the usual back-and-forth between separate consultants.