Homeowners pricing granny flat work find our independent cost guide first — and the enquiries that follow are exactly who you lock here, SMS-verified and yours alone. 15 cities live, one contractor per area.
A granny flat in Australia costs $110,000–$160,000 for a turnkey 1-bedroom build (35–45m²) and $140,000–$210,000 for a 2-bedroom (around 60m²), including services and standard finishes. Prefab/kit units start near $80,000 supplied, and custom or two-storey designs run $260,000–$425,000.
How much does a 2-bedroom granny flat cost in Australia?
A 2-bedroom granny flat in Australia (around 60m²) typically costs $140,000–$210,000 turnkey, depending on finishes, site works, and service connections. Premium finishes or a difficult site push it higher.
Do I need council approval for a granny flat in Australia?
In NSW most granny flats up to 60m² on a 450m²+ block can be approved as a Complying Development Certificate (CDC) through a private certifier in around 20 days, rather than a full DA. Your builder usually manages the application — always confirm with your council first.
Can I rent out a granny flat in Australia?
Yes. In NSW a secondary dwelling can legally be rented — a 2-bedroom in Australia earns roughly $400–$600 per week, and a granny flat typically adds 10–30% to a property’s value.
What is the cheapest way to build a granny flat?
A prefab or kit granny flat (from about $80,000 supplied) or a garage/outbuilding conversion ($40,000–$120,000) is the cheapest route. A standard single-storey build on a flat, easy-access block with standard finishes also keeps costs well below custom or two-storey designs.
How long does it take to build a granny flat in Australia?
Once approved, a site-built granny flat takes around 12–16 weeks. CDC approval adds roughly 3–6 weeks up front; prefab and modular units install faster once the slab and services are ready.
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