Knockdown Rebuild Mount Colah — One Contract, Demo to Keys
Everything under one agreement in Mount Colah 2079: demolition, asbestos removal, site prep, design, approvals, engineering, new home construction, landscaping and Occupation Certificate.
HIA Member
MBA NSW0476 300 300Mount Colah Knockdown Rebuilds
A knockdown rebuild in Mount Colah is a solid bushland-fringe play — 1960s to 1990s brick on generous 700 to 1,000m² R2 blocks backing Berowra Valley National Park, with its own station. The aging stock and generous blocks suit a substantial modern rebuild.
Bushfire is the defining design factor: BAL-12.5 to BAL-29 is typical, with Flame Zone on the direct bushland edge, so the RFS assessment shapes the design. The Hawkesbury Sandstone bedrock means rock of $30,000 to $120,000, priced from a geotech bore.
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 bushfire and rock costed, before you commit.
Buildana manages the complete knockdown rebuild process in Mount Colah — 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 Mount Colah from $450K
- Hornsby Shire Council DA and CDC approvals managed
- Demolition and asbestos removal included
- Hawkesbury Sandstone bedrock — engineered slab design included
- Typical blocks 700–1,000m² in Mount Colah
- Single and two-storey designs available
- 6-year structural warranty
- Free site assessment — near Mount Colah station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Generous blocks on the bush edge
Mount Colah's 700 to 1,000m² blocks backing Berowra Valley National Park give a rebuild real room, with the station in the suburb keeping the commute practical. The aging 1960s-90s brick is well into rebuild territory.
The bushfire rating is the defining design factor — BAL-12.5 to BAL-29 typical, Flame Zone on the direct bush edge — designed in from the RFS assessment.
Rock and era demolition
The Hawkesbury Sandstone bedrock means rock of $30,000 to $120,000, priced from a geotech bore. The older stock can carry asbestos, so a licensed strip-out leads the demolition where needed.
Both are in the feasibility and the fixed price.
Knockdown-rebuild builder in Mount Colah — key facts
- Suburb
- Mount Colah, NSW 2079
- Council / LGA
- Hornsby Shire Council (Hornsby Shire)
- Primary zoning
- R2 Low Density predominant
- Typical lot size
- 700–1,000m²
- 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.
Quality Promise
Mount Colah KDR projects run on one contract: demolition, asbestos clearance, approvals, construction, handover. One builder accountable.
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 Mount Colah 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 Mount Colah 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
Use our free calculator to get an instant cost estimate for your project
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
We Build Across Sydney
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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Knockdown Rebuild in Mount Colah
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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Mount Colah 2079. Hornsby Shire Council regulations and local controls are covered on each page.