Dual Occupancy Specialists Carlton — Licensed Duplex Builder
NSW licensed duplex builder in Carlton 2218. 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 Carlton 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.
Building Duplexes in Carlton
A duplex in Carlton works on the lots that clear the Bayside 600m2 minimum and sit off the heritage streets, with R3 around the station. This rail-line suburb between Kogarah and Bexley runs Federation cottages, inter-war heritage and post-war brick on 450 to 700m2 blocks, and at a $1.5M to $2.3M market a Torrens-title duplex on a qualifying lot is a strong play. Heritage sits in pockets, so the status check comes first.
The ground is Wianamatta Shale, so footings get stable bearing and a slab off geotech is routine on both dwellings. R3 around the station precinct means a well-placed lot may suit medium density instead, and on a qualifying R2 block a side-by-side works cleanly. Where older homes carry fibro a licensed asbestos strip-out comes first.
What I would check first on your Carlton block: whether it clears the 600m2 minimum, the heritage status, and any R3 near the station. 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 Carlton — 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 Carlton 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 Carlton
- M — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near Carlton 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 rail-line suburb runs Federation, inter-war and post-war stock on 450 to 700m2 blocks, so the larger lots clear the Bayside 600m2 minimum.
At a $1.5M to $2.3M market a Torrens-title duplex on a qualifying non-heritage lot is a strong play.
Stable ground, station R3
The Wianamatta Shale gives footings stable bearing, so a slab off geotech is routine on both dwellings.
R3 near the station means a well-placed lot may suit medium density, with heritage in pockets and older fibro stripped under licence.
Duplex builder in Carlton — key facts
- Suburb
- Carlton, NSW 2218
- 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.
How It Works
From First Call to Final Key
A duplex is really a feasibility problem wearing a construction outfit. Before anything else, we verify your Carlton block against Georges River Council's LEP — lot size, frontage, FSR, landscape area. If it doesn't stack up, you find out in a week, not after 3 months of design.
⏱Design runs dual from day one. Two dwellings, one coherent streetscape, party-wall acoustics and fire rating built into the structure rather than bolted on. The plan accommodates R2 Low Density zoning without looking like two mismatched houses sharing a fence.
⏱Approval and construction get sequenced together. Slab pours are choreographed so the trades show up once, frame up both sides, and keep rolling. Two separate meters, two separate services, but one crew, one programme.
⏱Handover is dual. Both dwellings walked at the same time, both OCs in the same issue, both titles subdivided before settlement. You leave the final inspection with the option to live in one and rent the other, or to sell both.
⏱Quality Promise
Every Buildana duplex in Carlton is built under a fixed-price contract — feasibility through to dual handover and subdivision.
Cost Guide
| Item | Estimated Range |
|---|---|
| Standard attached duplex — base spec | $710,000 – $900,000 |
| Upgraded finishes (stone, ducted A/C, upgraded kitchens) | $900,000 – $1,140,000 |
| Premium duplex (architect design, hydronic, landscape package) | $1,140,000 – $1,470,000 |
| Luxury detached dual occupancy | $1,470,000+ |
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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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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Fatima Al-Rashid
Liverpool, NSW
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Last updated: 1 July 2025
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Other Buildana services in Carlton
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Carlton 2218. Georges River Council regulations and local controls are covered on each page.