RemodoSecond-storey (first-floor) additions in NSW
Building up is one of the most popular ways to add space without losing backyard. In NSW a second storey almost always needs approval — here's how the pathways and key design constraints work.
You'll need approval — CDC or DA
A second-storey addition almost always requires either a Complying Development Certificate (CDC) or a Development Application (DA). The faster route is a CDC — a fast-tracked approval from an accredited certifier that typically takes around four to six weeks when your project meets every standard of the NSW Housing Code.
If your design doesn't fit the code (or the site has special controls), you go the DA route through council, which allows more discretion but takes longer and may involve neighbour notification.
Height, floor space and setbacks
Going up is shaped by the building height limit and floor space ratio (FSR) that apply to your block, plus upper-level setbacks. Upper floors are often stepped back from the walls below to manage bulk and street character.
Because these numbers come from your council's Local Environmental Plan (and the Housing Code for CDC), confirm your site's height limit and FSR before you design.
Overshadowing and privacy
A new upper storey can cast shadows and create sightlines into neighbours' yards, so councils and certifiers pay close attention here. You may need shadow diagrams showing your addition won't rob a neighbour of essential winter sunlight.
For privacy, upstairs windows facing neighbours are often required to use privacy screens, obscured glazing or higher sill heights to prevent direct overlooking.
Frequently asked
Do I need council approval for a second storey in NSW?＋
Almost always — either a fast-track Complying Development Certificate (CDC) if you meet the Housing Code, or a Development Application (DA) to council if you don't.
How long does a CDC take for a first-floor addition?＋
Typically around four to six weeks when the proposal meets all the coded standards.
Why might I need shadow diagrams?＋
To show your new storey won't overshadow a neighbour's living areas or private open space below minimum sunlight levels.
See it on your own block
Remodo overlays indicative zoning and setbacks on your property, so you can test a granny flat or extension in 3D before you commit. Start free with 50 credits.
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This content is general information only and is not planning, legal or professional advice. While we aim to keep these guides accurate and current, planning laws change frequently and vary by state, council/LGA, zone and site-specific controls (flooding, bushfire, heritage, easements and more). Figures quoted are indicative and may be out of date.
Remodo makes no warranty as to the accuracy, completeness or currency of this information and accepts no liability for any loss arising from reliance on it. Always confirm the requirements for your specific property with your local council or the relevant state planning portal, and seek advice from a qualified planner, certifier or lawyer before making decisions or starting work.