Granny Flat Rules in Queensland: What You Need to Know in 2025

Secondary dwellings, commonly called granny flats, are one of the smartest ways to add value to your Sunshine Coast property. Whether it's for aging parents, adult children, or rental income, understanding Queensland's regulations is the first step.

Size & Zoning Requirements

In Queensland, a secondary dwelling can be up to 80m² of gross floor area. Your property must be in a zone that permits secondary dwellings, most residential zones on the Sunshine Coast do. Check with the Sunshine Coast Council planning scheme for your specific lot.

Council Approval Process

Many granny flats can be built under accepted development, meaning they don't require a full development application, just a building approval. However, if your property is in a heritage overlay, flood zone, or bushfire area, additional approvals may be needed.

Design Considerations

A well-designed granny flat should feel like a complete home, not an afterthought. At IBG, we design secondary dwellings with full kitchens, modern bathrooms, and living areas that maximise natural light and ventilation, critical in our subtropical climate.

Costs & Timeframes

A quality granny flat on the Sunshine Coast typically costs between $150,000 and $250,000 depending on finishes, site conditions, and services connections. Build times are generally 12-16 weeks once approvals are in place.

Rental Potential

With the Sunshine Coast's strong rental market, a well-built granny flat can generate $350-$500+ per week in rental income, making it an excellent investment that can pay for itself within a few years.