Can I build a granny flat in Hawkesbury?
Instant SEPP Housing 2021 eligibility check for any Hawkesbury address — lot area, zoning, heritage exclusions (604 items in Hawkesbury), flood control lots, biodiversity values, and acid sulfate soils. Free. Also check solar yield and shadow impact for any Hawkesbury address.
Min. lot area
450 m²
SEPP Housing 2021
Heritage items
604
in Hawkesbury
Flood data
ARI scenarios
checked per address
What we check
Lot area
Min. 450 m² under SEPP Housing 2021
Zoning
R1, R2, R3, R4, R5/RU5 under SEPP Housing 2021 cl 49
Heritage exclusion
Heritage items and conservation areas
Flood control lots
Statutory flood overlay check
Biodiversity
Biodiversity values map exclusions
Acid sulfate soils
Class 1 & 2 soil exclusions
Dual occupancy prohibition
LEP prohibition map check
Granny flats in Hawkesbury — common questions
Can I build a granny flat in Hawkesbury?
Many Hawkesbury properties qualify, but flood exclusions are significant. The Hawkesbury-Nepean catchment has extensive flood mapping — properties within flood control lots are ineligible for CDC secondary dwellings. Check your address above to see the full picture.
How does flooding affect granny flat eligibility in Hawkesbury?
Hawkesbury has one of NSW's most significant flood risks. The 2024 Hawkesbury-Nepean River Flood Study maps 12 ARI scenarios. Properties within the 1% AEP (1-in-100-year) flood extent are on flood control lots and cannot use the CDC pathway for secondary dwellings.
What heritage restrictions affect granny flats in Hawkesbury?
Hawkesbury has 604 heritage items including significant colonial-era properties around Windsor, Richmond, and Wilberforce. Properties that are heritage items are excluded from SEPP Housing 2021 complying development. Conservation area properties may also face restrictions.
What lot size is needed for a granny flat in Hawkesbury?
The SEPP Housing 2021 minimum is 450 m². Rural-residential lots in Hawkesbury are typically large enough, but some town lots in Windsor and Richmond may be closer to the minimum. Check your specific lot area using the checker above.
Do I need a DA for a granny flat in Hawkesbury?
If the CDC eligibility check passes (lot size, zone, heritage, flood all clear), you can lodge through a private certifier without a council DA. If any check fails — particularly flood — a DA through Hawkesbury City Council is required.
Check other property risks in Hawkesbury
Also check nearby councils
Checks lot area, zoning, heritage items and conservation areas, flood control lots, biodiversity values, and acid sulfate soils against SEPP Housing 2021. Flood check uses ARI-quantified data for Hawkesbury. DCP setback and height controls not included. Not legal advice.