Building in Asquith: Knockdown Rebuild, Granny Flat & Duplex Guide
Hornsby Shire Council (NSW) · Indicative rules and costs for homeowners · 中文报告同样支持
Min lot (KDR)
500㎡
Max height
8.5m
Setbacks (front/side)
7.5m / 1.2m
DA timeline
20–40 wks
Fast-track CDC
Usually DA only
Build cost
$2400–$3600/㎡
📊 Indicative ranges from council planning controls and recent market data — not quotes, and individual blocks vary.
Bushfire risk significant. Many lots require DA (not CDC). Steep blocks add cost.
What can YOUR block in Asquith fit?
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Get my free feasibility report →Frequently asked questions — Asquith
Can I knock down and rebuild in Asquith?
Generally yes — Hornsby Shire Council requires a minimum lot of around 500㎡ for a standard knockdown rebuild, with a maximum building height of 8.5m. Most projects need a full DA (development application).
How long does council approval take in Asquith?
A DA through Hornsby Shire Council typically takes 20–40 weeks in practice.
How much does it cost to build in Asquith?
Typical build costs around Asquith run $2,400–$3,600 per square metre of floor area, plus demolition of roughly $20,000–$35,000. These are indicative ranges, not quotes.
Can I build a granny flat in Asquith?
In NSW, a secondary dwelling (granny flat) of up to 60㎡ can usually be approved via fast-track CDC on lots of 450㎡ or more, subject to overlays such as heritage, flood and bushfire.
What are the main risks for building projects in Asquith?
For the Hornsby Shire Council area: heritage risk is low, flood risk is low, bushfire risk is high. Bushfire risk significant. Many lots require DA (not CDC). Steep blocks add cost.
Nearby areas under Hornsby Shire Council
This page provides general guidance for the Hornsby Shire Council area and is not advice about any specific property. Planning controls change — always confirm with council or run a block-specific feasibility report. © 2026 AusBuildCircle 澳洲建房圈.