WA Building Permit Steps After Owner Builder Approval

WA Building Permit Steps After Owner-Builder Approval

Once your WA owner-builder approval is granted, you still must secure a building permit from your local council before any work starts on site. This involves choosing a certified or uncertified pathway, lodging the correct BA1 or BA2 form, and supplying all required plans, certificates and notices.

Why This Step Matters After Owner-Builder Approval

Owner-builder approval from the Building Services Board only confirms that you are allowed to act as the head contractor for eligible residential work over $20,000 on your own land. It does not give you permission to begin construction—starting work without a building permit is an offence under the Building Act 2011 and can lead to stop-work orders and penalties.

As an owner-builder, you are legally responsible for ensuring your project complies with the Building Code of Australia, relevant safety legislation, and all local government requirements for building approvals. Treat the building permit as your formal "green light" from council that your structural design, documentation and proposed works are compliant and can proceed.

WA Building Permit Basics for Owner-Builders

In Western Australia, anyone carrying out "builder work" valued over $20,000 must be a registered building contractor or approved owner-builder before they apply for a building permit. Once that approval is granted, you move into the building permit process with your local government for the specific Class 1 or Class 10 project you plan to build.

Local councils issue building permits using standard forms under the Building Act 2011—primarily BA1 for certified applications and BA2 for uncertified applications. Permits are mandatory for most new dwellings, extensions, and Class 10 structures such as garages, carports and sheds. From 1 July 2026, WA lifted the builder registration threshold for Class 10a structures (private sheds, garages and carports) from $20,000 to $50,000, meaning these lower-risk projects under $50,000 can now proceed without a registered builder or owner-builder approval. The $20,000 threshold still applies to all other building work, including houses and extensions. A building permit is required either way.

Step 1: Confirm Your Project Scope and Classification

Before you touch the BA1 or BA2 form, clarify exactly what you are building and how it is classified under the National Construction Code. Owner-builder work in WA typically covers:

Class 1a single dwellings — detached houses and extensions to them. Note that granny flats and ancillary dwellings have specific eligibility rules: if the granny flat shares any common building elements with the main house (a wall, roof or connecting floor), it isn't treated as a detached house for owner-builder purposes. Check your project's eligibility with Building and Energy before applying.

Class 10 non-habitable buildings such as private garages, carports, sheds and similar structures.

Some small commercial buildings up to two storeys and under 500 m², subject to specific limits.

Your building classification affects the structural requirements, energy efficiency provisions, bushfire controls, and documentation your building surveyor will need to issue a certificate of design compliance. It also shapes your WHS risk profile, including how you manage asbestos and silica hazards during demolition or construction.

Step 2: Choose Certified vs Uncertified Pathway (BA1 vs BA2)

WA offers two main building permit application pathways:

BA1 – Application for building permit (certified): You engage a private or local government building surveyor first, obtain a Certificate of Design Compliance (CDC), and then lodge the BA1 form with supporting documentation.

BA2 – Application for building permit (uncertified): You lodge your application without a CDC, and the local government's building surveyor assesses compliance and issues the certificate as part of the process.

Owner builders often prefer the certified (BA1) route because it can shorten assessment time—the council is primarily checking that the documentation is complete and that the CDC meets the legislative requirements. The uncertified (BA2) pathway may suit simpler projects but can take longer because all technical checks are performed by council.

Step 3: Assemble Your Core Documentation

Regardless of pathway, a WA building permit application must be supported by thorough technical documentation. Common inclusions for owner-builders are:

Detailed architectural drawings and site plan showing setbacks, floor levels, elevations, and any retaining walls or incidental structures.

Structural engineering drawings and specifications demonstrating compliance with the NCC and relevant Australian Standards.

Energy efficiency reports, bushfire attack level (BAL) assessments and other performance documentation, depending on location and design.

The Building Services Board's own owner-builder guidance expects your plans to demonstrate a "responsible level of detail" for safe construction and supervision of work. Investing in clear, coordinated documentation up-front reduces the risk of permit delays, redesigns and costly on-site variations.

Step 4: Engage Key Consultants (Including Your Building Surveyor)

Your building surveyor is central to the permit process, particularly if you choose the BA1 certified route. They review your plans, engineering and reports against the Building Code of Australia and relevant WA legislation, then issue a Certificate of Design Compliance confirming the design meets prescribed standards.

Depending on your project, you may also need:

Structural engineer, energy assessor and bushfire consultant for technical reports.

Planning consultant or designer to address local planning scheme requirements, overshadowing, privacy and streetscape impacts.

Owner-builders remain legally responsible for coordination of these consultants and for ensuring their outputs are consistent with each other and with your proposed construction sequence. This is exactly the type of project management skillset covered in the WA Owner-Builder Course now available through Owner Builder Institute for $179.

Step 5: Notify Neighbours Where Required (BA20)

Under the Building Act 2011 and associated regulations, some building work requires formal notice to adjoining owners before a permit can be issued. This typically applies when your work may affect another property—such as shared boundary retaining walls, encroachments, or excavations close to a neighbour's footing.

In these cases, you must issue a BA20 form (notice and request for consent) to affected owners and obtain written consent before council can grant the building permit. Managing neighbour relations professionally at this stage avoids disputes later and supports smoother inspections and handover.

Step 6: Complete and Lodge Your BA1 or BA2 Application

Once your documentation and consents are organised, you are ready to complete and submit your BA1 or BA2 form to the local government. For owner-builders, this usually involves:

Providing full owner details, property information and description of proposed works.

Listing yourself as the builder/contractor and attaching your owner-builder approval number.

Confirming project value (including materials, labour and associated work) and paying applicable fees.

Local councils use standard checklists alongside the BA1/BA2 forms to verify that your CDC (for certified applications), engineering, energy reports and any BA20 neighbour notices are included. Submitting a complete application the first time is one of the easiest ways to reduce assessment time and avoid frustrating "information request" letters.

Step 7: Understand Your Legal Responsibilities Once the Permit Is Issued

When your building permit is granted, you are authorised to commence the approved work, but your responsibilities as an owner-builder are just beginning. You must supervise the project, engage licensed electricians and plumbers where required, and ensure all work complies with the Building Code of Australia and safety regulations.

WA guidance emphasises that owner-builders remain responsible for the standard and structural soundness of the building for at least six years after completion. If you decide to sell within seven years of the building permit being issued, you will usually need home indemnity insurance in place to protect subsequent owners against defective work if you die, disappear or become insolvent.

Keep in mind that owner-builders can generally only be issued a building permit once every six years, unless the Building Services Board grants an exemption—so plan your project scope accordingly rather than assuming you can stage works under separate permits.

Asbestos and Silica: Critical Safety Checks Before and During Construction

Before your permit turns into a start date, there's one more compliance layer council won't check for you. For many WA owner-builders, the building permit is tied to projects involving demolition or renovation of pre-1990 homes—where asbestos-containing materials are common. Likewise, new builds and major renovations often involve high-silica products such as engineered stone, concrete, bricks and mortar, making silica dust a major WHS risk.

Even though asbestos awareness and silica awareness are not part of the formal building permit checklist, regulators expect you to manage these hazards competently under WHS and public health legislation. Completing structured asbestos awareness and silica awareness training before you cut, drill or demolish is one of the most practical ways to keep your project legally compliant and protect your own health.

How Owner Builder Institute Supports Your WA Project

Owner Builder Institute's WA Owner-Builder Course is designed to bridge the gap between "approval" and actually managing a compliant build from permit through to completion. Delivered fully online for $179, it covers:

WA owner-builder eligibility and limits, including project value thresholds, six-year responsibility and seven-year selling rules.

The building permit process step-by-step, including BA1 vs BA2, documentation, building surveyor coordination and neighbour notices.

Core WHS duties, insurance requirements and practical site management skills tailor-made for residential owner-builders in Western Australia.

Alongside this, our Asbestos Awareness and Silica Awareness courses provide targeted training for owner-builders, tradies and renovators who need to recognise hazardous materials and set up safe work practices before construction begins. Combining permit-focused training with hazard awareness gives you a much stronger foundation for supervising trades, controlling dust risks and keeping your project on track.

Frequently Asked Questions

Do I need a building permit after owner builder approval in WA?

Yes. Owner-builder approval from the Building Services Board only authorises you to act as the builder for your project—it does not authorise construction to begin. You must obtain a building permit from your local government before any work starts on site. Starting work without a permit is an offence under the Building Act 2011.

What is the difference between BA1 and BA2 in WA?

BA1 is the certified application pathway: you engage a building surveyor first, obtain a Certificate of Design Compliance, then lodge your application with council. BA2 is the uncertified pathway: you lodge without a CDC and the local government's building surveyor carries out the technical assessment. BA1 is generally faster because council is primarily checking documentation completeness rather than performing the full technical review.

Do I need a registered builder for a shed in WA?

From 1 July 2026, sheds, garages, carports and similar Class 10a non-habitable structures valued under $50,000 no longer require a registered builder or owner-builder approval in WA. You still need a building permit, and the work must still comply with building standards. For all other building work, including houses and extensions, the $20,000 threshold still applies.