Dual Occupancy Specialists Roseville — Licensed Duplex Builder
NSW licensed duplex builder in Roseville 2069. Torrens or strata subdivision, Ku-ring-gai Council planning expertise, full contract management for investor-grade builds.
HIA Member
MBA NSW0476 300 300Quick Answer
A duplex in Roseville 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.
Roseville Duplex Construction
A duplex in Roseville is rarely the right move, and I will say that up front. Ku-ring-gai sets a 1,200m2 minimum for dual occupancy, and Roseville lots run 750 to 1,200m2, so only the very largest blocks even reach the threshold. Add the heavy Federation and Californian Bungalow heritage stock, the conservation-area demolition scrutiny, and a $2.8M to $4.2M market, and a single quality home almost always returns more than two dwellings.
Where a rare 1,200m2 block sits outside a conservation area, a considered dual-occupancy can work, usually as a family hold rather than a sale per title. The ground grades moderately reactive, so footings and the slab are engineered to suit, and demolition on heritage stock is approached carefully with Council watching the streetscape.
What I would check first on your Roseville block: the exact area against the 1,200m2 minimum and the heritage status. Those two usually settle it before anything else.
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 is the better call.
Buildana manages the full duplex development process in Roseville — 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 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
- 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 station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The 1,200m2 minimum bites
Ku-ring-gai requires 1,200m2 for dual occupancy, and Roseville lots run 750 to 1,200m2, so only the very largest reach it.
Heavy heritage stock and conservation-area scrutiny narrow the options further on many streets.
Premium market favours a single home
At a $2.8M to $4.2M market, a single quality home almost always returns more than splitting the land into two.
Where a rare 1,200m2 non-heritage block exists, a dual-occupancy suits a family hold more than a sale per title.
Duplex builder in Roseville — key facts
- Suburb
- Roseville, NSW 2069
- Council / LGA
- Ku-ring-gai Council (Ku-ring-gai)
- Primary zoning
- R2 Low Density
- Typical lot size
- 750–1,200m²
- Soil class
- Class M
- Median house price
- $2.8M–$4.2M
- 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.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Feasibility covers the planning side and the financial side. Yes-or-no on whether the block supports dual occupancy under Ku-ring-gai Council controls, plus indicative end values, build cost, and likely yield. The point is to kill bad sites before you spend on design — not after. Dual occupancy floor plans designed for your Roseville block — attached or detached configuration, vehicle access, private open space, and full Ku-ring-gai Council compliance.
⏱The Roseville construction phase. Fixed price, programmed, supervised. Full approval management: Statement of Environmental Effects, plans, reports, and all supporting documentation lodged with Ku-ring-gai Council or private certifier. We handle RFIs and conditions. CC follows. Construction follows a tight programme: dual slabs in one mobilisation, paired frame stand, simultaneous lock-up, then trades rotate between sides for fit-out so no day is lost waiting on availability. The schedule is engineered, not optimistic.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Both dwellings handed over with individual Occupation Certificates. Subdivision lodged for separate titles. Separate metering installed. 6-year structural warranty per dwelling.
⏱Quality Promise
Roseville dual occupancy construction: feasibility assessment first, then fixed-price build to dual handover. No surprises.
Cost Guide
| Item | Estimated Range |
|---|---|
| Attached duplex (2 × 180–220m²) | $960,000 – $1,280,000 |
| Attached duplex (2 × 220–260m²) | $1,280,000 – $1,660,000 |
| Detached duplex (2 × 220–280m²) | $1,540,000 – $1,980,000 |
| Strata/Torrens subdivision | $19,000 – $38,000 |
| Demolition (if KDR duplex) | $23,000 – $51,000 |
| Council contributions | $13,000 – $77,000+ |
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
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Frequently Asked Questions
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Liverpool, NSW
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Last updated: 1 July 2025
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