Can I build a granny flat in Hornsby?

Instant SEPP Housing 2021 eligibility check for any Hornsby address — lot area, zoning, heritage exclusions (769 items in Hornsby), flood control lots, biodiversity values, and acid sulfate soils. Free.

Min. lot area

450 m²

SEPP Housing 2021

Heritage items

769

in Hornsby

Flood data

FPA mapped

checked per address

Checking SEPP Housing 2021 rules for Hornsby

What we check

Lot area

Tested per approval path (CDC frontage band, DA site area)

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 Hornsby — common questions

Can I build a granny flat in Hornsby Shire?

It depends on the property. Under SEPP Housing 2021 a secondary dwelling needs a zone that permits it, a lot that meets the minimum size, and none of the SEPP land exclusions (such as heritage, flood, biodiversity values and some acid sulfate soil classes). The checker above tests each one for your address.

Are biodiversity exclusions common in Hornsby?

Biodiversity exclusions can apply. Properties on the Biodiversity Values Map are excluded from SEPP Housing 2021 complying development for secondary dwellings. Bushland areas, creek lines, and reserves in Hornsby Shire can be mapped. The checker above tests the map for your address.

Does heritage affect granny flat eligibility in Hornsby?

Yes. Heritage items and properties in heritage conservation areas are excluded from complying development. Conservation areas exist in Berowra, Galston, and Hornsby township. The checker above shows whether your address is affected.

What lot size is needed for a granny flat in Hornsby?

SEPP Housing 2021 sets a minimum lot size for a secondary dwelling. The checker above reads the minimum from the SEPP and compares it with the lot area for your address.

Do I need council approval for a granny flat in Hornsby?

If all SEPP Housing 2021 checks pass, a CDC through a private certifier is the pathway and no council DA is needed. If any check fails, the CDC pathway is not available. A DA through Hornsby Shire Council may be possible, unless the zone prohibits a secondary dwelling.

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 statutory flood planning area boundaries for Hornsby. DCP setback and height controls not included. Not legal advice.