Dual Occupancy Specialists Greystanes — Licensed Duplex Builder
NSW licensed duplex builder in Greystanes 2145. Torrens or strata subdivision, Cumberland City Council planning expertise, full contract management for investor-grade builds.
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A duplex in Greystanes costs $750,000–$1,500,000+ for dual occupancy construction. Attached duplex from $750K, detached from $1M. Buildana manages feasibility, Cumberland City Council approvals, construction and subdivision under one fixed-price contract.
Building Duplexes in Greystanes
A duplex in Greystanes is a feasible dual-occupancy on the generous blocks that clear the Cumberland minimum. This well-established family suburb runs 1970s to 1990s homes on 550 to 750m2 generous blocks with its own shopping centre and strong amenities, and at a $1.1M to $1.4M market a Torrens-title duplex on a qualifying lot is a sound play. Some lots fall short, so the area is the first check.
The ground is engineered off geotech to suit the specific lot, and on a qualifying block a side-by-side duplex works cleanly. There are no broad heritage overlays, which keeps the approval path predictable. Where the existing home carries fibro a licensed asbestos strip-out comes first.
What I would check first on your Greystanes block: whether it clears the Cumberland minimum, the footing design, and the frontage. Those set the dual-occ.
We build these fixed-price, licence HBL 487805C. Send me the block and I will tell you what dual-occupancy it carries.
Buildana manages the full duplex development process in Greystanes — 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 Greystanes from $750K
- Cumberland City Council DA and CDC approvals managed
- R2 and R3 zones — established dual occ. provisions
- Minimum lot size 600m² in Greystanes
- Class M soil — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near Merrylands (3 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Generous family blocks
This well-established family suburb runs 1970s to 1990s homes on 550 to 750m2 generous blocks with its own shopping centre.
At a $1.1M to $1.4M market a Torrens-title duplex on a lot clearing the Cumberland minimum is a sound play.
A clean dual-occ build
The ground is engineered off geotech to suit, and on a qualifying block a side-by-side works cleanly.
No broad heritage overlays keep the path predictable, with older fibro stripped under licence first.
Duplex builder in Greystanes — key facts
- Suburb
- Greystanes, NSW 2145
- Council / LGA
- Cumberland City Council (Cumberland City)
- Primary zoning
- R2 Low Density & R3 Medium Density
- Typical lot size
- 550–750m²
- Soil class
- Class M
- Median house price
- $1.1M–$1.4M
- Home era
- 1970s–1990s
- 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 (2 × 180–220m²) | $790,000 – $1,050,000 |
| Attached duplex (2 × 220–260m²) | $1,050,000 – $1,370,000 |
| Detached duplex (2 × 220–280m²) | $1,260,000 – $1,630,000 |
| Strata/Torrens subdivision | $16,000 – $32,000 |
| Demolition (if KDR duplex) | $19,000 – $42,000 |
| Council contributions | $11,000 – $63,000+ |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Quick desktop check first — lot size, zoning, frontage — then full site visit if it stacks. Drainage path, neighbour overlooking, slope, services, easements. 600m² minimum is just the entry ticket; the real feasibility is whether two compliant dwellings actually fit and sell. Our architect designs both dwellings to maximise your Greystanes block's yield — floor plans, elevations, 3D renders, and landscape concept. We optimise for rental return and sale value under Cumberland City Council's DCP.
⏱The Greystanes construction phase. Fixed price, programmed, supervised. Most Greystanes duplexes go DA route through Cumberland City Council — CDC pathways for dual occupancy are restrictive on most R2 blocks. We pre-meet with council planners on borderline sites to confirm support before lodgement, which avoids a 3-month round trip on RFIs. Both dwellings built simultaneously — engineered slabs (Class M soil), frame, lock-up, fit-out. Milestone updates from your project manager.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Final inspections, dual OCs issued, subdivision registered with LRS. Each dwelling gets its own title, services, and 6-year structural warranty. Ready to rent, sell, or occupy.
⏱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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Duplex in Greystanes — Book Site Assessment
Free duplex feasibility assessment for Greystanes 2145. We'll check your block, estimate yield, and provide a fixed-price budget.
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Other Buildana services in Greystanes
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Greystanes 2145. Cumberland City Council regulations and local controls are covered on each page.