Dual Occupancy Specialists Mortdale — Licensed Duplex Builder
NSW licensed duplex builder in Mortdale 2223. Torrens or strata subdivision, Georges River Council planning expertise, full contract management for investor-grade builds.
HIA Member
MBA NSW0476 300 300Quick Answer
A duplex in Mortdale costs $750,000–$1,500,000+ for dual occupancy construction. Attached duplex from $750K, detached from $1M. Buildana manages feasibility, Georges River Council approvals, construction and subdivision under one fixed-price contract.
Mortdale Duplex Construction
A duplex in Mortdale works on the lots that clear the Georges River 600m2 minimum, with R3 along Morts Road adding options and its own station. This village suburb between Penshurst and Oatley runs Federation cottages, inter-war heritage and 1960s to 1990s brick on 450 to 650m2 R2 blocks, so the larger lots clear 600 while smaller ones fall short. A Torrens-title duplex on a qualifying lot is a sound play near the shopping strip and station.
The ground is engineered off geotech to suit the specific lot, and R3 Medium Density along Morts Road means a well-placed lot may suit medium density. On a qualifying R2 lot a side-by-side works cleanly. Where the existing home carries fibro a licensed asbestos strip-out comes first.
What I would check first on your Mortdale block: whether it clears the 600m2 minimum, any R3 along Morts Road, and the frontage. Those set the best use.
We build these fixed-price, licence HBL 487805C. Send me the block and I will tell you the best use of it.
Buildana manages the full duplex development process in Mortdale — 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 Mortdale from $750K
- Georges River Council DA and CDC approvals managed
- R2 and R3 zones — established dual occ. provisions
- Minimum lot size 600m² under Georges River LEP 2021 in Mortdale
- M — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near Mortdale station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Feasibility against 600m2
This village suburb runs Federation, inter-war and 1960s to 1990s brick on 450 to 650m2 R2 blocks, so the larger lots clear the Georges River 600m2 minimum.
A Torrens-title duplex on a qualifying lot is a sound play near the shopping strip and station.
R3 along Morts Road
The ground is engineered off geotech to suit, and R3 Medium Density along Morts Road may suit medium density.
On a qualifying R2 lot a side-by-side works cleanly, with older fibro stripped under licence first.
Duplex builder in Mortdale — key facts
- Suburb
- Mortdale, NSW 2223
- Council / LGA
- Georges River Council (Georges River Council)
- Primary zoning
- R2 Low Density
- Typical lot size
- 400–700m² typical (Hurstville/Kogarah/Beverly Hills/Penshurst/Mortdale/Carlton/Kingsgrove/Allawah); 600–1,200m² premium foreshore (Oatley/Lugarno/Peakhurst Heights/Connells Point)
- Soil class
- M
- Median house price
- $1.5M–$2.4M typical; $2.0M–$3.5M Oatley/Lugarno/Peakhurst Heights premium foreshore; $3.0M–$8.0M+ direct waterfront
- Home era
- 1920s–1960s heritage Federation/Californian Bungalow + 1960s–1990s brick veneer + 2010s+ R3/R4 redevelopment around Hurstville/Kogarah/Beverly Hills CBDs
- 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 |
|---|---|
| Vacant R2/R3 block in Mortdale — duplex build | $750,000 – $1,500,000 |
| KDR duplex (demo 1920s–1960s heritage Federation/Californian Bungalow + 1960s–1990s brick veneer + 2010s+ R3/R4 redevelopment around Hurstville/Kogarah/Beverly Hills CBDs home + dual build) | $820,000 – $1,600,000 |
| Subdivision-ready block (existing survey & titles) | $750,000 – $1,400,000 |
| Corner block dual-frontage duplex | $900,000 – $1,600,000 |
| Investor scenario (neutral-gear focus, rental-ready) | $850,000 – $1,250,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
Free feasibility check on your Mortdale block. We measure frontage width, confirm zoning (R2 Low Density), check minimum lot size against 600m² under Georges River LEP 2021 requirement, and review Georges River Council's DCP controls.
⏱Two dwellings, one site — design is mostly about geometry. Frontage split, party wall position, garage stacking, private courtyard size, and the streetscape elevation a certifier will actually approve.
⏱DA through Georges River Council (40–90 days) or CDC (10–15 business days). Mortdale is zoned R2 Low Density.
⏱Dual construction runs 9–14 months. Engineered slabs sized for Class M soil, simultaneous frame-up, staggered fit-out for efficiency.
⏱Two homes, two titles, two OCs, two warranty packs. We hand over a clean documentation set per dwelling: certifier reports, BASIX certs, structural sign-offs, appliance warranties, maintenance schedules.
⏱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
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Liverpool, NSW
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Last updated: 1 July 2025
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Free duplex feasibility assessment for Mortdale 2223. We'll check your block, estimate yield, and provide a fixed-price budget.
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Other Buildana services in Mortdale
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Mortdale 2223. Georges River Council regulations and local controls are covered on each page.