Start with how you want to use the space

An extra building can solve very different problems. You might need independent accommodation for family, a quiet place to work or room for hobbies and storage. Start by describing that purpose before comparing sizes, finishes or prices.

A granny flat and a garden room can look similar in a photograph, but appearance alone does not tell you whether a building is suitable for living or sleeping. The intended use, approved design and requirements for your property all matter.

When you need a dwelling

A granny flat is a self-contained dwelling associated with an existing home. If you need accommodation, compare designs intended for that purpose and ask about the complete project: the building, foundations, services, installation and approvals.

Explore Goodlife granny flat designs for Perth and WA, including layouts for independent living and family accommodation. Ask our team which building and delivery options apply to your chosen design.

When a garden room may suit your plans

If your priority is a separate workspace, creative studio or hobby room, a garden room may provide the space you are looking for. Think about the activities, furniture, access and comfort you need throughout the day.

Class 10a is a non-habitable building classification that includes buildings such as private garages, carports and sheds. Do not assume a garden room or shed is approved for sleeping, or that a proposed office use is automatically suitable. Confirm the classification and intended use for the specific design and site.

Compare our garden room kits and discuss how you plan to use the space.

Check planning and building requirements separately

Planning approval and a building permit are different processes. Some compliant ancillary dwellings in WA may be exempt from planning approval, but a building permit is still required. Requirements and exemptions depend on the proposal and property.

Before committing, discuss the project with your local government and building professional. Describe the intended use accurately and check the current requirements rather than relying on a building’s marketing name.

Questions to take to your first conversation

• Will anyone live or sleep in the building?
• What classification and approved use apply to this design?
• Which foundations, services and site works are needed?
• What is included in the building or kit supply?
• Which tasks need qualified professionals?

Compare modular building options, on-site building in Perth and DIY kits, then ask which approach fits your project.

Further reading

Official references: WA building approvals and classifications, WA Residential Design Codes, and City of Wanneroo ancillary dwelling guidance.

General project-planning guidance, reviewed 19 October 2026. Confirm current requirements for your own property and intended use.