Knockdown Rebuild Westleigh — From $450K All-In
Fixed-price knockdown rebuild in Westleigh 2120. Demolition, new home, all Hornsby Shire Council approvals under one contract. No surprises, no variation trail.
HIA Member
MBA NSW0476 300 300Quick Answer
A knockdown rebuild in Westleigh 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.
Westleigh Knockdown Rebuilds
A knockdown rebuild in Westleigh is a bushland-fringe family play — 1970s to 1990s brick on generous 700 to 1,200m² R2 blocks backing Berowra Valley National Park. The aging stock and generous blocks suit a substantial modern rebuild, with bushfire designed in.
BAL-12.5 to BAL-29 is typical on the bush-fringe lots, so the RFS assessment shapes those designs. The Hawkesbury Sandstone bedrock means rock of $30,000 to $120,000, priced from a geotech bore.
The older 1970s homes 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 Westleigh — 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 Westleigh 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 in Westleigh
- Single and two-storey designs available
- 6-year structural warranty
- Free site assessment — near Thornleigh (2 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Room to build on the bush edge
Westleigh's 700 to 1,200m² blocks backing Berowra Valley National Park give a rebuild genuine room, and the aging 1970s-90s brick is well into rebuild territory. A substantial modern family home fits comfortably.
On the bush-fringe lots, BAL-12.5 to BAL-29 shapes the design from the RFS assessment — designed in from the start.
Rock and era demolition
The sandstone bedrock means rock of $30,000 to $120,000, priced from a geotech bore. The older 1970s homes 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 Westleigh — key facts
- Suburb
- Westleigh, NSW 2120
- Council / LGA
- Hornsby Shire Council (Hornsby Shire)
- Primary zoning
- R2 Low Density predominant
- Typical lot size
- 700–1,200m²
- 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.
How It Works
From First Call to Final Key
Free site inspection of your Westleigh property. We check lot dimensions, Hornsby Shire Council's planning controls, existing home condition, and potential asbestos. Written assessment with budget estimate within 5 business days.
⏱KDR is the chance to get the design right — the new build doesn't have to mimic the original layout. We start from your block's strengths (orientation, slope, views) and your family's brief, then design the home the original lot always deserved.
⏱Licensed demolition of existing 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-era dwelling. Asbestos removal by certified contractors (if present). Site cleared, levelled, and ready for new slab. Typically 1–2 weeks.
⏱Your new home goes up on the cleared site. Engineered slab sized for Class Hawkesbury Sandstone bedrock soil, frame, roof, fit-out, kitchen, bathrooms, flooring, painting, driveway, and landscaping. Quality inspections at every stage.
⏱Handover pack: OC, structural certificates, BASIX, appliance manuals and warranties, paint colour schedule, maintenance plan, and the keys. Six-year structural warranty kicks in from OC date — keep the documentation safe for any future sale.
⏱Quality Promise
Our Westleigh knockdown rebuilds sequence demolition, slab, frame, lockup, handover. Fixed price locked before demolition starts.
Cost Guide
| Item | Estimated Range |
|---|---|
| Entry-level single storey KDR | $480,000 – $650,000 |
| Mid-range double storey KDR | $720,000 – $1,000,000 |
| Architectural KDR | $1,000,000 – $1,500,000 |
| Luxury KDR (high-spec finishes) | $1,500,000+ |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
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
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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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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Westleigh 2120. Hornsby Shire Council regulations and local controls are covered on each page.