Learn about the planning and building requirements for constructing a self-contained ancillary dwelling (granny flat) to ensure compliance with safety standards and local regulations.
Definitions
- Ancillary dwelling/granny flat: self-contained dwelling on the same site as a dwelling which may be attached to, integrated with or detached from the dwelling.
- Rental arrangements: An ancillary dwelling (granny flat) can be rented out separately from the main house, provided it fits the definition of a dwelling under the R-Codes.
- Dwelling: A building or portion of a building being used, adapted, designed, or intended to be used for the purpose of human habitation on a permanent basis by a single person, a single family, or no more than six persons who do not comprise a single family.
- Development (Planning) Approval: This is the City’s approval of your project's design and location, ensuring it aligns with local zoning and planning rules. It's the essential first step for any new building or significant alteration on your property.
- Building Permit: A formal permission from the City for the construction, extension, or major renovation of a building, ensuring safety and compliance with building codes.
- R-Codes: R-Codes, formally known as State Planning Policy 7.3 - Residential Design Codes, are a set of regulations that govern residential development in Western Australia. They detail the minimum requirements for the design and assessment of residential properties, focussing on aspects like building size, open space, setbacks, and density to ensure sustainable and community-friendly development across various residential zones.
How to apply
Ancillary dwellings are generally exempt from Development (Planning) Approval when they adhere to specific development standards.
These standards, deemed to comply under the R-Codes, include:
- Maximum floor area: The ancillary dwelling should not exceed a floor area of 70m².
- Parking requirements:
- For a Single House zoned R40 and below, and a Grouped Dwelling zoned R25 and below one car bay is required in addition to the parking provision for the main dwelling, as per clause 5.3.3 C3.1. Exemptions may apply to properties located within 800m walking distance from a train station or 250m from a high-frequency bus route.
- For a Single House zoned R50 and above, and a Grouped Dwelling zoned R30 and above no additional car bay is required.
- Compliance with R-Codes: The development must comply with all relevant R-Code provisions and schemes, including height, setbacks, etc.
- Design compatibility: The ancillary dwelling must match the colour, roof pitch, and materials of the existing dwelling on the same lot.
- Additional requirements: If the property is within a structure plan area, there may be additional requirements.
Any development not meeting these criteria may require Development (Planning) Approval.
Not sure of your R-Code or if your property is in a structure plan area? Insert your address into our online mapping system to view the R-Code and structure plan details. Contact the City of you need assistance.
If your project does not comply with the requirements set out in Step 1 above, you will need to apply for Development (Planning) Approval. This requires submitting an application form, along with building plans and a cover letter. Application fees will apply.
For detailed information, refer to the Requirements for Planning Applications.
The National Construction Code sets nationwide standards for building design and construction, focusing on safety, health, and amenity.
A building permit is required for all ancillary dwellings (granny flats).
You have two options when applying for a Building Permit:
- Certified application: Lodge a BA1 form, accompanied by a Certificate of Design Compliance (BA3 form) signed by a registered building surveyor, confirming compliance with building standards.
- Uncertified application: Lodge a BA2 form, accompanied with the Uncertified Building Application Checklist - Dwelling and habitable additions (PDF).
You can download BA1 and BA2 forms from the Department of Energy, Mines, Industry, Regulation and Safety website.
For more detailed information, including the application form, checklist, assessment process, and fees can be found on the Requirements for Building Applications page.
More information and contact
For more information on approval and permit requirements for constructing ancillary dwellings/granny flats, contact the City on 9400 4000 or via info@joondalup.wa.gov.au. You can also visit the City’s Customer Care desk during office hours Monday - Friday, 8.30am - 5pm.