How Much Does a Granny Flat Cost in Western Australia?
A granny flat in WA typically costs between $120,000 and $300,000 depending on size, finish level and site conditions.
A compact studio or one-bedroom up to 40 sqm generally starts around $120,000 to $150,000. A two-bedroom flat between 50 and 70 sqm, the most common size in WA, typically ranges from $150,000 to $250,000. High-end finishes, sloped sites or regional locations can push costs higher.
On top of construction, budget around $10,000 for design, council approval (DA) and building permit (BP) documentation.
Use our cost estimator above to get an indicative range based on your specific project: size, finish level, site conditions and location across Western Australia.
Arcaia Studio prepares council-ready granny flat documentation for homeowners and builders across all of WA, including Perth, Busselton, Dunsborough, Margaret River, Geraldton and Exmouth. Fixed pricing, delivered typically within 14 days.
