The Cook Labor Government is building a library of pre-assessed, architect-designed homes for medium-density infill. The approach has already shown results in New South Wales. Here is what builders in WA need to know.

Planning approvals have been one of the most stubborn bottlenecks in Australian housing delivery for years. Builders know it. Developers know it. Councils know it. And now, at least in Western Australia, the government is taking a direct run at it.

The Cook Labor Government has announced it is developing a Western Australian pattern book, a curated library of architect-designed, pre-assessed home designs aimed at medium-density infill projects. The initiative is part of a record $4.7 billion investment in housing supply and affordability in the 2026-27 State Budget, with $2 million allocated over two years to develop the program.

The idea is straightforward: if the design is already approved, the approval process gets dramatically shorter. For builders, that should mean fewer months lost to paperwork before a single footing is poured.

What a Pattern Book Actually Is

The term borrows from the textile and sewing world. In construction, it means a government-curated set of ready-to-use architectural designs that have already been assessed against planning and building standards.

Instead of a developer or builder commissioning a custom design, waiting for council assessment, and navigating the full approval cycle, they can select a pre-approved pattern, confirm site eligibility, and move into certification in a fraction of the usual time.

The Western Australian version will focus specifically on medium-density housing types suited to established suburban lots. Townhouses are explicitly mentioned, along with designs suited to common infill lot sizes in well-located areas near public transport, schools, and services, including precincts around the METRONET rail network.

All designs will be required to meet standards for energy efficiency, universal access, and climate-resilient construction. The Government Architect Western Australia will lead the program.

The NSW Template Is Already Working

NSW approval times for eligible pattern book projects came in at 10 to 20 days. That is not a headline figure. That is a structural shift in how long housing delivery takes.

Western Australia is not starting from scratch. It is drawing directly on a model that New South Wales launched in July 2025.

The NSW Housing Pattern Book was developed by the Government Architect NSW and made available through a competitive international design process. It covers terraces, manor houses, row houses, and eventually mid-rise apartment typologies. Each design comes with full architectural drawings, landscape plans, and guidance documentation.

Crucially, the NSW program was paired with a new complying development pathway, meaning eligible pattern book projects could bypass the standard development application process entirely. Approval times for eligible projects came in at 10 to 20 days. That is not a headline figure. That is a structural shift in how long housing delivery takes.

The NSW model also addressed one of the most common concerns in medium-density development: design quality. Rather than allowing any compliant design to move through a fast-track pathway, the pattern book required architect-designed templates selected for liveability, sustainability, and fit with existing streetscapes.

Western Australia has confirmed it is building on this model. The pattern book will be developed by the Government Architect Western Australia and will target the same types of infill sites: well-located, suburban, close to infrastructure, and suited to the housing types most needed right now.

Why This Matters for Builders

The announcement sits within a much larger spending commitment. The $4.7 billion State Budget allocation includes money to build thousands of homes, unlock tens of thousands of lots, and support first home buyers and renters. The pattern book is one piece of that program, but it is a meaningful one.

For builders, the practical implication is this: if the program is implemented well, it should reduce the front-end risk of medium-density projects.

Currently, a townhouse development on an infill block can involve months of design work, council pre-lodgement meetings, formal DA assessment, and potential requests for additional information before a builder is even engaged. If the design is pre-assessed, that process collapses.

That also has implications for cost certainty. When a design and its approval pathway are predictable, pricing becomes more reliable. Trades can be scheduled with greater confidence. Financiers can assess risk more clearly. All of which makes smaller-scale medium-density projects more viable for more builders.

There is also a workforce dimension worth noting. Medium-density infill, townhouses, duplexes, smaller multi-dwelling projects in established areas, is work well-suited to the type of builder that makes up most of the Australian residential construction industry: experienced, capable, and looking for reliable project pipelines. Reducing approval friction makes more of that work accessible.

The Constraints Worth Watching

Pattern books are not a universal fix. They work well when the site conditions align with the template. Irregular lots, heritage overlays, bushfire or flood zones, complex services infrastructure, all of these can push a project outside the fast-track pathway and back into the standard assessment process.

In New South Wales, the program excluded heritage items, heritage conservation areas, and unsewered land. Bushfire and flood constraints carried through as they would under any other approval pathway. WA’s program will likely carry similar carve-outs once the details are published.

The other constraint is volume. A library of pre-assessed designs is only as useful as the number of sites it applies to and the speed at which the broader planning system can process the certifications that follow. If the pattern book pathway creates a new bottleneck at the certification stage, some of the speed gain will be absorbed there.

These are not reasons to discount the initiative. They are reasons to watch how it is implemented once the two-year development period concludes and designs are made available to industry.

What Builders Should Do Now

The WA pattern book is still in development. The $2 million investment covers a two-year period, which means designs are unlikely to be available to industry before late 2027 at the earliest.

In the meantime, builders working in or looking to enter the WA medium-density market can look at what the NSW program has produced. The NSW Housing Pattern Book is publicly available and gives a clear sense of the design typologies, lot size assumptions, and approval pathways that a mature pattern book program can support.

For builders already active in WA, it is worth engaging with the program as it develops. Industry feedback on which lot sizes are most common, which housing types have the strongest demand, and which planning constraints most frequently slow projects down will all shape how useful the final designs are in practice.

A Tool, Not a Fix

Planning approvals alone do not deliver homes. Land availability, financing, trade capacity, and material costs all play a role. The WA pattern book is a delivery tool, not a comprehensive solution to housing supply.

But delivery tools matter. The NSW experience suggests that pre-approved, architect-designed templates can meaningfully compress the time between a project decision and a building permit, particularly for the medium-density typologies that are most needed in established suburbs.

If Western Australia executes this well, it could become one of the more practical reforms in the current housing policy cycle. Not because it solves everything, but because it removes a real and specific barrier that builders, developers, and certifiers deal with on every project.

That is worth watching closely.

General information only. This article does not constitute planning, legal, or commercial advice. Readers should seek independent professional guidance for specific projects.

Author: TGB Editorial