← All Insights

Knockdown Rebuilds

The Ultimate Guide to a Knock Down Rebuild in Castle Hill

Everything Castle Hill homeowners need to know about a knock down rebuild in 2026 — local zoning, soil, costs, approvals through The Hills Shire Council, and whether it suits your block.

TL;DR Castle Hill is one of Sydney's strongest knock down rebuild markets: a median house price around $2.5 million, large established blocks, and decades-old homes sitting on prime Hills District land. A knock down rebuild (KDR) lets you keep that land and your school catchment while building a brand-new home suited to how families actually live here. Expect 12–20 months end to end and a new build from roughly $2,500–$4,500+ per square metre, plus demolition and Castle Hill's particular site costs — reactive shale soil and the occasional sloping or acreage block being the big local variables. This guide covers the whole journey, Castle Hill–specific. Why Castle Hill suits a knock down rebuild Castle Hill sits about 30km north-west of the CBD in The Hills Shire, now linked to the city by t…