Yes. Despite rising construction costs, granny flats remain one of the most cost-effective ways to generate rental income, increase property value and create flexible family accommodation. On the Central Coast, demand for well designed secondary dwellings remains strong.
A realistic turnkey build price should include: Design and drafting Engineering Council or CDC approval BASIX compliance Construction Standard fixtures and finishes Plumbing and electrical Stormwater connections It is important to confirm what is included in any quote before comparing pricing.
Most custom-built granny flats in NSW range between $3,750 to $8,7500 per square metre. Smaller dwellings may have a higher rate per square metre due to fixed costs such as kitchens and bathrooms.
In 2026, most quality custom-built granny flats in NSW start at approximately $225,000, including GST. Larger designs, garages, and complex sites typically range from $275,000 to $525,000 an upwards, depending on the size and inclusions.
In most cases, no. While some companies advertise lower starting prices, these often exclude council approvals, site works, utility connections, and standard inclusions. Once fully compliant and turnkey, most one-bedroom granny flat projects exceed $225,000.
A typical 2 bedroom granny flat on the Central Coast generally ranges between $245,000 and $295,000 including GST, depending on finishes, site conditions and design complexity.
The most affordable option is usually a compact 1-bedroom design on a flat, easily accessible block with standard inclusions. Even then, realistic turnkey pricing in NSW typically starts around $225,000 including GST.
