Knockdown Rebuild Castle Hill — One Contract, Demo to Keys
Everything under one agreement in Castle Hill 2154: demolition, asbestos removal, site prep, design, approvals, engineering, new home construction, landscaping and Occupation Certificate.
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A knockdown rebuild in Castle Hill costs $450,000–$1,200,000+. Standard single-storey from $450K, two-storey from $650K. Buildana manages demolition, The Hills Shire Council approvals, and construction under one fixed-price contract.
Knockdown Rebuild Builder in Castle Hill
Castle Hill's 1970s to 2000s brick homes are reaching the age where a knock down and rebuild beats another renovation. The block sizes are the reason, 600 to 1,000m² of R2 land walking distance from Castle Towers and the Metro station is too valuable to leave under a dated floor plan. With medians at $1.9M to $3.0M, the land is doing the heavy lifting, the house on it usually is not.
Wianamatta Shale sits under the suburban core, which keeps foundation engineering more predictable than the sandstone suburbs, a genuine cost advantage. The Hills DCP prefers 700m² for duplexes, so the bigger blocks open a dual-occupancy path worth modelling alongside a single home. Between the Showgrounds, the schools and the Metro, this is a hold-and-rebuild suburb, not a sell-and-leave one.
What I would check first on a Castle Hill block: whether a duplex out-earns a single home at 700m²-plus, the shale foundations, and the Metro walk. Those set the plan.
We build these fixed-price, licence HBL 487805C. Compare both options with us before you decide which way to jump.
Buildana manages the complete knockdown rebuild process in Castle Hill — 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 Castle Hill from $450K
- The Hills Shire Council DA and CDC approvals managed
- Demolition and asbestos removal included
- M — engineered slab design included
- Typical blocks 600–1,000m² in Castle Hill
- Single and two-storey designs available
- 6-year structural warranty
- Free site assessment — near Castle Hill (Sydney Metro Northwest, in suburb) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The land does the heavy lifting
Castle Hill's 1970s to 2000s brick homes are reaching the age where a rebuild beats another renovation. The 600 to 1,000m² R2 blocks walking distance from Castle Towers and the Metro are too valuable to leave under a dated floor plan.
At $1.9M to $3.0M medians the land is doing the heavy lifting and the house usually is not, so it is a hold-and-rebuild suburb, not a sell-and-leave one.
Predictable ground, a duplex option
Wianamatta Shale under the suburban core keeps foundation engineering more predictable than the sandstone suburbs, a genuine cost advantage.
The Hills DCP prefers 700m² for duplexes, so the bigger blocks open a dual-occupancy path worth modelling alongside a single home. We compare both before you decide which way to jump.
Knockdown-rebuild builder in Castle Hill — key facts
- Suburb
- Castle Hill, NSW 2154
- Council / LGA
- The Hills Shire Council (The Hills)
- Primary zoning
- R2 Low
- Typical lot size
- 600–1,000m²
- Soil class
- M
- Median house price
- $1.9M–$3.0M
- Home era
- 1970s–2000s
- 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 |
|---|---|
| Entry-level single storey KDR | $500,000 – $680,000 |
| Mid-range double storey KDR | $760,000 – $1,050,000 |
| Architectural KDR | $1,050,000 – $1,580,000 |
| Luxury KDR (high-spec finishes) | $1,580,000+ |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
We assess your Castle Hill block — lot size (typical 600–1,000m²), R2 Low zoning, setbacks, FSR, and existing dwelling condition. Asbestos survey included. You'll know feasibility and budget before committing.
⏱Complete design package: floor plans, elevations, 3D renders, structural engineering, geotech, BASIX, stormwater, and all documentation The Hills Shire Council requires. Approval managed start to finish.
⏱Pre-demolition: dilapidation report on adjoining properties (protects you against unfounded damage claims), service disconnections, asbestos clearance, neighbour notification. Then 1–2 weeks of physical demolition with material sorted at site for recycling where possible.
⏱Fixed-price construction: engineered slab, frame, lock-up, fit-out, external works. 8–12 months depending on size. Weekly progress reports with photos and milestone tracking.
⏱Same address, completely different home. Permanent gas, water, electrical, NBN reconnected and tested. Council waste collection re-registered. Mailbox reinstalled. Move-in ready, not move-in plus 100 small jobs.
⏱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 Castle Hill
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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Castle Hill 2154. The Hills Shire Council regulations and local controls are covered on each page.