Granny Flat Solutions
NationalSpecialist Builder
Granny Flat Builder
One of Australia's most experienced granny flat specialists with 3,000+ builds completed. Offers a full design-and-build service with council approval management, site assessment and turnkey delivery.
3,000+ buildsTurnkey service
States: NSW, QLD, VIC
Backyard Grannys
NSW Specialist
Granny Flat Builder
NSW granny flat specialist with in-house design, approval and construction. Known for fast turnaround and transparent fixed pricing. Offers standard and custom designs from studio to 2-bedroom.
Fixed pricingNSW specialist
States: NSW (Greater Sydney)
Prefabricated Granny Flat Builder
Prefabricated (modular) granny flat specialist offering faster construction timelines. Factory-built units installed on-site in days rather than months. Range of sizes and configurations.
Faster constructionModular design
States: NSW, VIC, QLD
NSW Department of Planning
Government
Granny Flat Planning Rules (NSW)
In NSW, complying development certificates (CDC) allow granny flats up to 60sqm on lots 450sqm+ without full council approval. The NSW planning portal provides the official guidelines and application process.
CDC approvalNSW planning rules
States: NSW
Victorian Building Authority
Government
Building Permits & Second Dwellings (VIC)
Victorian regulatory body for building permits. Secondary dwellings in VIC require planning permits in most zones. The VBA provides guidance on building permits, inspections and compliance for new structures.
Building permits VICCompliance guidance
States: Victoria
Tiny Homes Australia
National
Tiny Home & Granny Flat Supplier
Supplier of transportable tiny homes and granny flats. Units arrive ready-to-occupy with plumbing and electrical pre-installed. Suitable for rural and regional properties with fewer council restrictions.
Transportable unitsRural suitable
States: All states
Granny Flat Approvals
Approval Specialist
Granny Flat Planning Consultants
Specialist consultancy managing the council approval and complying development process for granny flat projects. Takes the complexity out of navigating state-specific planning rules.
Approval specialistAll states experience
States: NSW, QLD, VIC, WA
Granny Flats in Australia: Rules, Costs and Considerations
A granny flat (also called a secondary dwelling) can be an excellent solution for keeping elderly parents close while maintaining independence. Rules vary significantly by state.
Typical Granny Flat Costs (2025)
- Custom build (60sqm): $120,000–$180,000 turnkey
- Prefabricated/modular: $80,000–$130,000 installed
- Transportable: $60,000–$100,000 delivered
- Conversion of existing structure: $40,000–$90,000
NSW — Easiest State for Granny Flats
NSW has the most permissive granny flat rules in Australia. On lots 450sqm+ with an existing dwelling, a secondary dwelling up to 60sqm can be approved as complying development (CDC) without full council consent — significantly faster and cheaper than a Development Application (DA).
Key Considerations
- Check your local council's LEP (Local Environment Plan) for secondary dwelling rules
- Confirm sewer, water and electrical connection requirements
- Understand how a granny flat affects your property's land tax and capital gains position
- Consider future care needs — single-level, wider doorways, grab rails and step-free access
Building costs and planning rules vary by location and are subject to change. Always obtain quotes from licensed builders and confirm current planning rules with your local council.