Knockdown Rebuild Hornsby — From $450K All-In
Fixed-price knockdown rebuild in Hornsby 2077. Demolition, new home, all Hornsby Shire Council approvals under one contract. No surprises, no variation trail.
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MBA NSW0476 300 300Quick Answer
A knockdown rebuild in Hornsby costs $450,000–$1,200,000+. Standard single-storey from $450K, two-storey from $650K. Buildana manages demolition, Hornsby Shire Council approvals, and construction under one fixed-price contract.
Hornsby KDR — Single Contract, New Home
A knockdown rebuild in Hornsby depends on which part you hold — the CBD high-rise zone around the station and Westfield, or the R2 residential streets on generous 600 to 900m² blocks. On the residential streets, a rebuild of the aging brick stock works well, with the hospital and interchange keeping demand genuine.
The Hawkesbury Sandstone bedrock means rock of $30,000 to $120,000, priced from a geotech bore, and the bushland-fringe lots carry BAL ratings that shape the design. The 600m² duplex minimum puts a dual-occupancy in play on most blocks.
The older stock can carry asbestos, so a licensed strip-out leads the demolition where needed.
We rebuild fixed-price, licence HBL 487805C. Get our feasibility, with the rock and bushfire costed, before you commit.
Buildana manages the complete knockdown rebuild process in Hornsby — from site assessment and architectural design through to DA or CDC approval, demolition management, and fixed-price construction to handover. One builder, one contract, one new home.
Read our KDR Cost Guide 2026 or use the Renovation vs KDR Calculator to compare options.
- New home in Hornsby from $450K
- Hornsby Shire Council DA and CDC approvals managed
- Demolition and asbestos removal included
- Hawkesbury Sandstone bedrock — engineered slab design included
- Typical blocks 700–1,200m² typical (Hornsby/Asquith/Pennant Hills/Beecroft/Wahroonga boundary/Cherrybrook); 1–5ha acreage (Galston/Berrilee/Arcadia/Forest Glen/Glenorie/Berowra Heights bushland fringe) in Hornsby
- Single and two-storey designs available
- 6-year structural warranty
- Free site assessment — near Hornsby station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Side streets, not the CBD
Hornsby's CBD high-rise zone is redevelopment territory, and a block there is usually worth more assembled — I tell you so. On the R2 residential streets, the generous 600 to 900m² blocks of aging brick suit a modern rebuild, with the hospital and interchange keeping demand genuine.
The 600m² duplex minimum puts a dual-occupancy in play on most blocks.
Rock and bushfire fringe
The Hawkesbury Sandstone bedrock means rock of $30,000 to $120,000, priced from a geotech bore. On the bushland-fringe lots, BAL ratings shape the design from the RFS assessment.
The older stock can carry asbestos, so a licensed strip-out leads the demolition where needed.
Knockdown-rebuild builder in Hornsby — key facts
- Suburb
- Hornsby, NSW 2077
- Council / LGA
- Hornsby Shire Council (Hornsby Shire)
- Primary zoning
- R2
- Typical lot size
- 700–1,200m² typical (Hornsby/Asquith/Pennant Hills/Beecroft/Wahroonga boundary/Cherrybrook); 1–5ha acreage (Galston/Berrilee/Arcadia/Forest Glen/Glenorie/Berowra Heights bushland fringe)
- Soil class
- Hawkesbury Sandstone bedrock
- Median house price
- $1.8M–$2.6M Hornsby/Asquith/Mount Colah; $2.4M–$3.6M Cherrybrook/Beecroft/Pennant Hills; $3.0M–$8.0M+ Galston/Arcadia acreage
- Home era
- 1900s–1940s Federation heritage
- Typical price range
- $450,000 – $1,200,000+
- Typical timeline
- 14–22 months including demolition
- Approval pathway
- CDC where eligible or DA for complex sites
Want a real number for YOUR block — not a generic estimate?
Free site assessment, fixed-price contract, line-itemised quote within 48 hours. No high-pressure sales — just a real builder talking real numbers.
Cost Guide
| Item | Estimated Range |
|---|---|
| Clean demolition + standard rebuild | $480,000 – $750,000 |
| Asbestos-affected demolition + rebuild | $510,000 – $800,000 |
| Sloping site + cut/fill + rebuild | $560,000 – $900,000 |
| Heritage-affected or complex site | $600,000 – $1,100,000 |
| Premium finishes & architectural design | $950,000+ |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
KDR starts with an honest look at the existing house. Sometimes it's worth keeping. Most Hornsby homes from the 1900s–1940s Federation heritage (Beecroft/Cheltenham/Pennant Hills/Wahroonga boundary) + 1960s–1990s brick (Cherrybrook/Asquith/Mount Colah/Mount Kuring-gai) + 2010s+ R3/R4 redevelopment around Hornsby/Asquith/Waitara stations — especially fibro and brick-veneer — are beyond the point where renovation makes sense. We tell you straight.
⏱Demolition is pre-approved to run parallel with rebuild design. Asbestos cleared, services abolished, site stripped in a single mobilisation. Geotech reconfirms Class Hawkesbury Sandstone bedrock soil with the old house gone.
⏱New house goes up on the same footprint or a better one, whichever serves the block. Modern NCC envelope, better orientation, fit-for-purpose room sizes. The suburb stays the same; the house finally fits it.
⏱Final handover: new OC, six-year structural warranty, all the documentation on your Hornsby block you'd get on a greenfield build. The only difference is you still live in the street you chose.
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
Estimate Your Build Cost
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Still got questions? Talk to Oliver directly.
30-min free call — bring your block, your brief, your budget. We'll map out feasibility, timeline, and realistic cost. No sales pitch.
Frequently Asked Questions
Buildana built our granny flat in just 12 weeks. Fast approvals, great communication, and a beautiful final product. Highly recommend.
Fatima Al-Rashid
Liverpool, NSW
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Headquartered in Western Sydney's Fairfield. Active across all 28 metropolitan Sydney LGAs — from Penrith to the Eastern Suburbs, the Hills to the Sutherland Shire.
Last updated: 1 April 2026
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