Perth ADU Permit Requirements - Western Australia Bylaws
Introduction
In Perth, Western Australia, adding an accessory dwelling unit (ADU) requires navigating both planning rules and building approvals administered by the City of Perth and state agencies. This guide explains when planning approval is needed, how the State Residential Design Codes influence setbacks and site cover, the building approvals process, enforcement risks and practical steps to apply or appeal.
Overview - Planning vs Building Approval
Two approvals commonly apply to ADUs: a development (planning) approval to satisfy zoning and the Residential Design Codes, and a separate building approval/certificate for structural, fire and safety compliance. Planning criteria often reference the R-Codes for lot size, setbacks and maximum floor area; check the R-Codes for detailed numeric standards.[2]
- Confirm whether your property zoning allows an ADU and whether the proposal is classed as an "ancillary" or "secondary" dwelling.
- Check applicable R-Code design criteria for your zone: site area, setbacks, lot boundary setbacks and open space.
- Determine if the proposal triggers a development application or can be assessed as a permitted change under the local planning framework.
Permissible ADU standards
Standards vary by zone and by whether the ADU is attached or detached. Typical matters assessed include maximum floor area, privacy, overshadowing, parking provision and vehicle access.
- Parking: councils may require additional on-site parking depending on lot size and existing provision.
- Privacy and overlooking: windows and balcony treatments may be conditioned to protect neighbours.
- Heritage overlays or special control areas can impose extra controls or prohibit ADUs.
Penalties & Enforcement
Development without the required planning approval or building approval can attract enforcement action by the local government and the state building regulator. Specific penalty amounts for unlawful development or building work are not specified on the cited City of Perth planning pages; consult the enforcement pages or contact the City directly for up-to-date fines and infringement amounts.[1]
- Monetary fines: not specified on the cited page.
- Escalation: first/repeat/continuing offence ranges are not specified on the cited page.
- Non-monetary sanctions: stop-work orders, removal or demolition orders, compliance notices and prosecution through the State Administrative or Magistrates Court.
- Enforcer: City of Perth planning compliance and the state Building and Energy regulator handle inspections, notices and prosecutions; complaints and inspection requests are submitted via the City of Perth planning contact pathways.
- Appeals/review: review avenues include internal review by council, the State Administrative Tribunal for certain planning decisions and the courts for building orders; time limits for appeals vary by instrument and are not specified on the cited page.
Applications & Forms
Most ADU projects require both a development application and a building approval. Development application forms, checklists and application lodgement instructions are published by City of Perth or the approving local government. Building approvals and certification (building permits) are managed under the state building rules by Building and Energy; look for the guidance and forms for building approvals on the state regulator site.[3]
- Development application form: name and number not specified on the cited City page; check the City of Perth forms page or planning counter for the current DA form.
- Fees: application fees vary by proposal and are not specified on the cited pages; the City of Perth fee schedule provides precise amounts.
- Lodgement: online or in-person via the City of Perth planning portal or counter as instructed on official pages.
Action steps
- Pre-application: contact City of Perth planning to confirm zoning and whether a DA is required.
- Prepare plans showing compliance with R-Codes and a site plan addressing parking and services.
- Lodge development application and pay fees; await assessment and conditions.
- Obtain building approval/certificate and engage a registered builder or certifier before starting works.
FAQ
- Do I always need planning approval for an ADU in Perth?
- Not always; whether a development application is required depends on zoning, proposal scale and local policy—check with City of Perth planning for your property.
- Do I need a separate building permit?
- Yes, structural and safety work requires building approval or certification from a registered building surveyor and compliance with Building Code requirements.
- What if a neighbour objects?
- Planning applications may be publicly advertised; the City will assess objections as part of its decision process and will advise on rights to appeal.
How-To
- Contact City of Perth planning to confirm zoning and preliminary requirements.
- Review the R-Codes relevant to your zone and prepare compliant design drawings.
- Complete and lodge the development application with supporting documents and fees.
- If approved, obtain building approval/certificate and satisfy any conditions before construction.
- Notify neighbours per any advertising requirements and address conditions during construction.
Key Takeaways
- ADUs need both planning and building approvals in many Perth locations.
- Check R-Codes and council zoning early to avoid refusal delays.
- Contact City of Perth planning and the state Building and Energy regulator for forms and fees.
Help and Support / Resources
- City of Perth - Development Approvals and Planning Contacts
- WA Residential Design Codes (R-Codes)
- Building and Energy - Commerce WA (building approvals)