WA R-Code Changes 2026: What Perth Homeowners Need to Know

If you own a home in Perth, the rules that govern what you can build on your block have changed, and more changes could be on the way. The R-Code changes 2026  happened in stages. Transitional provisions for certain higher-density areas ended on 10 April 2026, while proposed reforms announced on 2 July could eventually allow more than 50,000 Perth properties to subdivide. This guide separates what is already in effect from what is still proposed, explains what an R-Code actually means and looks at how the changes could affect granny flats, extensions, subdivisions and new builds across Perth.

What Is an R-Code in WA, and Why Does It Matter to You?

An R-Code is a set of residential planning and design provisions that helps determine how residential land can be developed in Western Australia. The Residential Design Codes WA can influence density, site area, building design, parking and other development requirements, making it an important consideration before you plan work on your Perth property.

In simple terms, the higher the R-Code number, the greater the density generally permitted. If you’re wondering how many dwellings can I build on my block Perth, the R-Code provides an initial guide, but the actual outcome depends on the characteristics of your site. The examples below show how common R-Codes compare in terms of minimum and average site area requirements.

These figures are useful for understanding density at a basic level, but they do not guarantee that a particular number of homes can be built. Site access, frontage, setbacks, open space, existing structures and local planning requirements can all affect the final development outcome. The R-Codes are also used when assessing residential subdivision proposals. 

If you’re wondering what my R-Code Perth is, you can check your property’s planning information or confirm the zoning with your local council before planning a project. Those who are planning to start new construction should contact experienced boutique home builders Perth to understand how their design goals can work within the block’s planning requirements. 

What’s Already Changed: In Effect Since 10 April 2026

The key change already affecting some Perth projects is the end of transitional provisions for single-house developments in R50 and higher areas covered by relevant structure plans or local development plans. From 10 April 2026, these developments must generally be assessed against Part C of R-Codes Volume 1, subject to a specific solar-orientation exception.

For homeowners, there are two areas worth understanding: the treatment of higher-density developments and the expanded granny flat provisions that are already available under the current R-Code framework.

Transitional Provisions for Higher-Density Zones Have Expired

The R50 transitional provisions expired on 10 April 2026. Developments that involve single housing units and those that are provided for in structure plans or local development plans should conform to Part C of Residential Design Codes Volume 1. However, some of the existing plans continue to enjoy an exemption from the solar access requirement up until 10 April 2030. If your plans were prepared under the previous provisions, have them reviewed against the current requirements. Consult an experienced residential construction Perth team to review the requirements. 

Granny Flat Rules Have Genuinely Expanded

The major granny flat changes came into effect in April 2024, removing the previous 350m² minimum lot size requirement and allowing compliant ancillary dwellings on residential lots of any size, subject to relevant requirements. According to the 2024 granny flat parking rules, ancillary dwellings also don’t need to have an additional parking bay.

The rules also removed the need to match the existing home’s design and expanded eligibility to grouped dwellings and strata lots. This gives Perth homeowners more flexibility when considering a granny flat. Homeowners should also distinguish the STRA granny flat WA rules from the general R-Code provisions, particularly where short-term rental arrangements are being considered. 

What’s Proposed: Announced 2 July 2026, Not Yet Law

The proposed Perth planning approval changes in 2026 could create more development opportunities, particularly for larger blocks in R20 and lower-density areas. However, these are still proposals and do not change the rules homeowners must follow today.

The main proposals include:

• R20 subdivision: With the average lot size R20 removed, 700m² blocks might become eligible for subdivision. This proposed R20 subdivision changes WA could impact more than 50,000 Perth properties.
• Simpler approvals: Development projects including one-off houses, redevelopment, patios, and carports may need fewer planning approvals.
• Faster approvals: Single-home approval timeframes could be reduced from 60 days to 30 days.
• More development flexibility: Three-storey development in R40 areas and removing minimum parking requirements for apartments and granny flats are also being considered.

These changes could have a significant impact on established Perth suburbs, but homeowners should not rely on them yet. Public consultation is expected later in 2026, with implementation targeted for 2027 if the reforms proceed. Before submitting plans, professional design drafting and permits can help ensure your project addresses the applicable planning and building requirements. 

What Should Perth Homeowners Do Right Now?

Many try to figure out: Can I subdivide my block in Perth? The answer will depend on which regulations apply currently to your property and the proposed changes. Depending upon your R-Code, block size, and the type of project, the actions that you need to take vary.

If you are planning a project, these are the key points to keep in mind:

• If your property is R50 or higher: Contact your builder, architect or planning expert to ensure that the plans made under the old transitional provisions have been checked against the current provisions.
• If you’re considering a granny flat: Review the eligibility of your property. The elimination of the minimum lot size requirement and expanded provisions on grouped and strata dwellings may provide you with options that did not exist previously under the old provisions. Check the granny flat cost in Perth 2026 to plan your budget. 
• If your R20 block is around 700m² to 900m²: Keep an eye on the proposed Perth subdivision rules 2026. Your property could potentially benefit if the average lot size requirement is eventually removed.
• If you’re planning an extension or new build: Continue working with the rules currently in force rather than waiting for proposed changes that have not yet been adopted. If you’re considering an extension, reviewing the house extension cost in Perth 2026 can give you a clearer idea of the financial commitment before you begin planning. 
• If you’re considering subdivision: Have the block assessed properly before assuming that its R-Code alone determines what you can do. Access, frontage, easements, existing buildings and other planning considerations can all influence the outcome.

The important thing is not to treat the proposed reforms as a reason to rush. Instead, understanding your property’s current potential can put you in a stronger position if the proposed changes are eventually adopted.

Conclusion

The amendments to WA’s R-Code that were implemented in 2026 signify a significant move away from what was seen before regarding the building of houses and subdivision in Perth. Some of these changes are currently in place, while some of the R-Codes announcements are still going through the consultation process. The overall direction is towards greater flexibility, simpler approvals and more housing opportunities. If you’re exploring a granny flat, extension or subdivision, BODA Building Group can help you understand how the current framework may apply to your property.