Do I Need a Survey to Build a Granny Flat in Sydney?

Yes, you typically need a survey to build a granny flat in Sydney. A detail survey (also called a site survey or feature survey) is required for your DA or CDC application, costing $800-$1,500. You may also need a setout survey once construction begins to ensure the building is positioned correctly on your lot.

What Type of Survey Do You Need for a Granny Flat?

For a granny flat in Sydney, you typically need:

• Detail Survey: $800-$1,500 - Shows existing structures, trees, levels, and boundary positions
• Boundary Survey: $600-$1,200 - If boundaries are unclear (sometimes required)
• Setout Survey: $400-$800 - Marks exact building corners during construction

Total survey costs for a granny flat project range from $800 to $3,500.

Can You Build a Granny Flat Without a Survey?

No, building a granny flat without a survey is not recommended and usually not permitted in Sydney. Councils require accurate site plans for DA or CDC applications, which need survey data. Building without a survey risks encroaching on setbacks, easements, or neighbouring properties, which can result in costly demolition orders.

Complying Development Granny Flats

Yes, even CDC (Complying Development Certificate) granny flats in Sydney need a survey. Certifiers require accurate site plans showing boundaries, setbacks, and existing features to verify compliance with the State Environmental Planning Policy.