Knockdown Rebuild Castle Cove — From $450K All-In
Fixed-price knockdown rebuild in Castle Cove 2069. Demolition, new home, all Willoughby City Council approvals under one contract. No surprises, no variation trail.
HIA Member
MBA NSW0476 300 300Quick Answer
A knockdown rebuild in Castle Cove costs $450,000–$1,200,000+. Standard single-storey from $450K, two-storey from $650K. Buildana manages demolition, Willoughby City Council approvals, and construction under one fixed-price contract.
New Home on Your Castle Cove Block
A knockdown rebuild in Castle Cove is a premium bush-and-harbour project on the Middle Harbour ridge — 700 to 1,200m² blocks holding 1960s to 1990s stock, with significant slope on many lots. The setting between Sailors Bay and Castle Cove proper is a genuine draw, and a rebuild lets you design around it.
The slope and the ground do a lot of the work here. The soil is mixed Class M to H with sandstone outcrops, so a rebuild on a sloping block often needs stepped or suspended footings, retaining, and sometimes rock excavation. I get a real geotech so all of that is costed properly.
On the bush-fringe streets backing onto Garigal National Park, a bushfire assessment and BAL rating apply. There is no station here — bus or drive to Chatswood or Roseville.
We rebuild fixed-price, licence HBL 487805C. Get our knockdown rebuild feasibility, with slope, rock and bushfire costed, before you commit.
Buildana manages the complete knockdown rebuild process in Castle Cove — 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 Cove from $450K
- Willoughby City Council DA and CDC approvals managed
- Demolition and asbestos removal included
- Class M–H soil — engineered slab design included
- Typical blocks 700–1,200m² in Castle Cove
- Single and two-storey designs available
- 6-year structural warranty
- Free site assessment — near Roseville (3 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Bush-and-harbour ridge
Castle Cove sits on the Middle Harbour ridge between Sailors Bay and Castle Cove proper, on bush-edge blocks of 700 to 1,200m² with significant slope on many lots. A rebuild lets you design a substantial home that works with the slope and the bush setting rather than fighting it.
The 1960s to 1990s stock is generally into rebuild territory, so a knockdown resets it well.
Slope, sandstone and bushfire
The soil is mixed Class M to H with sandstone outcrops, so a sloping block often needs stepped or suspended footings, retaining, and sometimes rock excavation. I get a real geotech so the slope, rock and retaining are all costed properly.
On the bush-fringe streets backing onto Garigal National Park, a bushfire assessment and BAL rating apply. I check the mapping for your block upfront.
Knockdown-rebuild builder in Castle Cove — key facts
- Suburb
- Castle Cove, NSW 2069
- Council / LGA
- Willoughby City Council (Willoughby)
- Primary zoning
- R2 Low Density
- Typical lot size
- 700–1,200m²
- Soil class
- Class M–H
- Median house price
- $3.0M–$4.5M
- Home era
- 1960s–1990s
- 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 Castle Cove property. We check lot dimensions, Willoughby City 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 1960s–1990s-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 M–H 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
Buildana handles Castle Cove KDR end-to-end — old house out, new house in, one contract, one contractor, one defined timeline.
Cost Guide
| Item | Estimated Range |
|---|---|
| Entry-level single storey KDR | $610,000 – $830,000 |
| Mid-range double storey KDR | $920,000 – $1,280,000 |
| Architectural KDR | $1,280,000 – $1,920,000 |
| Luxury KDR (high-spec finishes) | $1,920,000+ |
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
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
Explore Related Topics
Knockdown Rebuild in Castle Cove
Free KDR site assessment for Castle Cove 2069. We'll assess your block, estimate cost, and provide a fixed-price budget.
Start Your ProjectMore in Castle Cove
Other Buildana services in Castle Cove
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Castle Cove 2069. Willoughby City Council regulations and local controls are covered on each page.