Granny Flat Rules in NSW: What You Can & Can’t Build
Before building a granny flat in Sydney, it’s essential to understand the NSW rules. This guide breaks down everything you need to know — block size, setbacks, approvals and design requirements.
Minimum Requirements for a Granny Flat in NSW
1. Minimum Lot Size
Your block must be 450m² or larger.
2. Maximum Size
Granny flats can be up to:
60m² internal floor area
Some councils allow more under DA
Setback Requirements
Typical setbacks include:
3m from rear boundary
0.9m–1.5m from side boundaries
Distance from main dwelling (varies by council)
Approval Pathways
CDC (Complying Development Certificate)
Fastest option — often approved in 2–4 weeks.
DA (Development Application)
Required for:
Irregular blocks
Flood zones
Bushfire zones
Larger designs
Learn more: Design & Drafting Sydney
What You Can Build
1 or 2 bedrooms
Kitchen
Bathroom
Laundry
Living area
Outdoor deck
Separate entrance
What You Can’t Build
More than 60m² internal space (CDC)
Two‑storey granny flats (CDC)
Granny flats on strata lots
Granny flats without street access
Common Compliance Issues
Building too close to boundaries
Incorrect drainage
Non‑compliant windows
Overlooking/privacy issues
Start Your Granny Flat Project With Confidence
Credible Homes handles design, approvals and construction from start to finish.