Dual Occupancy Specialists Roseville Chase — Licensed Duplex Builder
NSW licensed duplex builder in Roseville Chase 2069. Torrens or strata subdivision, Ku-ring-gai Council planning expertise, full contract management for investor-grade builds.
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MBA NSW0476 300 300Quick Answer
A duplex in Roseville Chase costs $750,000–$1,500,000+ for dual occupancy construction. Attached duplex from $750K, detached from $1M. Buildana manages feasibility, Ku-ring-gai Council approvals, construction and subdivision under one fixed-price contract.
Building Duplexes in Roseville Chase
A duplex in Roseville Chase is rarely the play, and the harbour is the reason. This is a Middle Harbour suburb with waterfront and water-view blocks running 700 to 1,400m2, so only the largest reach the Ku-ring-gai 1,200m2 dual-occupancy minimum. At a $3.0M to $5.5M market driven by the harbour setting, a single quality home almost always returns more than splitting the land into two.
Where a rare 1,200m2 block sits away from the water and outside a heritage street, a dual-occupancy can be considered, usually as a family hold. The ground grades moderately reactive over sandstone, and lots with significant fall to the water need suspended slabs and substantial retaining, which two dwellings only make more expensive.
What I would check first on your Roseville Chase block: the area against 1,200m2, the fall to the water, and the heritage status. Those settle whether a duplex is even worth modelling.
We build these fixed-price, licence HBL 487805C. Send me the block and I will tell you honestly whether a duplex or a single home makes more of the position.
Buildana manages the full duplex development process in Roseville Chase — from feasibility assessment and architectural design through to DA or CDC approval, and fixed-price construction to dual handover. One builder, one contract, two homes.
Read our Complete Duplex Building Guide or explore duplex developments across Sydney.
- Dual occupancy in Roseville Chase from $750K
- Ku-ring-gai Council DA and CDC approvals managed
- R2 zoning — eligible under July 2024 reform
- Minimum lot size 1,200m² in Roseville Chase
- Class M soil — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near Roseville (2 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Harbour setting, 1,200m2 minimum
Roseville Chase blocks run 700 to 1,400m2, so only the largest reach the Ku-ring-gai 1,200m2 dual-occupancy minimum.
The Middle Harbour setting and a $3.0M to $5.5M market push the value toward a single quality home.
Fall to the water adds cost
Lots with significant fall to the water need suspended slabs and substantial retaining over the sandstone.
Two dwellings only multiply that cost, which is why a duplex rarely beats a single home here.
Duplex builder in Roseville Chase — key facts
- Suburb
- Roseville Chase, NSW 2069
- Council / LGA
- Ku-ring-gai Council (Ku-ring-gai)
- Primary zoning
- R2 Low Density
- Typical lot size
- 700–1,400m²
- Soil class
- Class M
- Median house price
- $3.0M–$5.5M
- Home era
- 1920s–1960s
- Typical price range
- $750,000 – $1,500,000+
- Typical timeline
- 14–22 months design to handover
- Approval pathway
- CDC for compliant dual-occupancy, else DA
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 |
|---|---|
| Attached duplex (side-by-side) | $980,000 – $1,430,000 |
| Attached duplex (stepped/offset) | $1,170,000 – $1,630,000 |
| Detached duplex (two fully separate dwellings) | $1,560,000 – $2,080,000 |
| Luxury detached duplex | $2,080,000+ |
| Party-wall acoustic & fire upgrade | Included |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
Site visit, title search, and planning assessment for your Roseville Chase block. We check lot dimensions against Ku-ring-gai Council's minimum (1,200m²), review overlays, drainage, access, and services. You get a clear yes/no on duplex feasibility plus estimated yield.
⏱Design has to satisfy four audiences at once: Ku-ring-gai Council, the future buyer or tenant, the certifier, and you. Each pull in a different direction — our job is to land plans that work for all four. Solar access, privacy, parking, POS, FSR, all balanced.
⏱We lodge and chase your approval — DA through Ku-ring-gai Council for most duplexes, or CDC where eligible. R2 Low Density zoning in Roseville Chase. CC issued, conditions cleared, ready to build.
⏱Building both sides in parallel halves the loan interest holding cost vs sequential builds. Bulk material orders for cabinetry, tiles, fixtures cut unit cost. Single site setup, single supervisor, single insurance period — efficiency compounds across the whole programme.
⏱Strata or Torrens title subdivision completed. Separate OCs, individual metering, 6-year structural warranty per dwelling. Strong rental demand near Roseville (2 km).
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
Estimate Your Build Cost
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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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Last updated: 1 July 2025
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