Knockdown Rebuild Double Bay — One Contract, Demo to Keys
Everything under one agreement in Double Bay 2028: demolition, asbestos removal, site prep, design, approvals, engineering, new home construction, landscaping and Occupation Certificate.
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A knockdown rebuild in Double Bay costs $450,000–$1,200,000+. Standard single-storey from $450K, two-storey from $650K. Buildana manages demolition, Woollahra Municipal Council approvals, and construction under one fixed-price contract.
Demolish and Rebuild in Double Bay
A knockdown rebuild in Double Bay is a premium harbourside project — Federation mansions, inter-war homes and harbourside apartments on 250 to 1,000m² blocks with substantial fall to the harbour. At Double Bay values, the first question on many blocks is whether to rebuild or restore, and I will give you an honest read.
Heritage Conservation Areas cover most streets, so a rebuild generally goes down the DA path with a sympathetic design. The substantial harbour fall means suspended slabs, retaining and rock excavation on the fall lots, and the sandstone-dominant ground brings rock generally, all priced from a real geotech.
The pre-war stock can carry asbestos and lead paint, so a licensed strip-out leads the demolition. Where you hold an apartment rather than a detached home, a knockdown does not apply.
We rebuild fixed-price, licence HBL 487805C. Get our feasibility — rebuild or restore — before you commit.
Buildana manages the complete knockdown rebuild process in Double Bay — 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 Double Bay from $450K
- Woollahra Municipal Council DA and CDC approvals managed
- Demolition and asbestos removal included
- M — engineered slab design included
- Typical blocks 250–1,000m² in Double Bay
- Single and two-storey designs available
- 6-year structural warranty
- Free site assessment — near Edgecliff (1 km, ferry to Circular Quay) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Premium harbour, restore-or-rebuild
Double Bay is harbourside premium — New South Head Road shops, the Bay Street village, a harbour beach, and Federation mansions on 250 to 1,000m² blocks. On a detached home with harbour fall, a rebuild lets you design around the outlook.
At these values, on a well-kept heritage home, a restoration often preserves value better than a knockdown. I give you an honest read on which your block suits.
Harbour fall and sandstone rock
The substantial harbour fall means suspended slabs, retaining and rock excavation on the fall lots, and the sandstone-dominant ground brings rock generally, all priced from a real geotech. Heritage Conservation Areas cover most streets, so a rebuild generally goes down the DA path.
The pre-war stock can carry asbestos and lead paint, so a licensed strip-out leads the demolition.
Knockdown-rebuild builder in Double Bay — key facts
- Suburb
- Double Bay, NSW 2028
- Council / LGA
- Woollahra Municipal Council (Woollahra)
- Primary zoning
- R2 Low
- Typical lot size
- 250–1,000m²
- Soil class
- M
- Median house price
- $4.5M–$15M
- Home era
- 1900s–1940s + apartments
- 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 |
|---|---|
| Demolish 1900s–1940s + apartments fibro → modern brick double storey | $730,000 – $1,400,000 |
| Demolish brick veneer → new brick veneer (like-for-like uplift) | $670,000 – $1,190,000 |
| Demolish to downsize (smaller footprint) | $640,000 – $1,010,000 |
| Demolish to upsize (growing family) | $980,000 – $1,680,000 |
| Demolish older home, rebuild investment-grade | $780,000 – $1,260,000 |
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 Double Bay block — lot size (typical 250–1,000m²), R2 Low zoning, setbacks, FSR, and existing dwelling condition. Asbestos survey included.
⏱Complete design package: floor plans, elevations, 3D renders, structural engineering, geotech, BASIX, stormwater, and all documentation Woollahra Municipal 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.
⏱Same address, completely different home. Permanent gas, water, electrical, NBN reconnected and tested.
⏱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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