Duplex Builder Mortlake — From $750K Fixed Price
Fixed-price duplex construction in Mortlake 2137. Two dwellings, one contract, no variations. Minimum lot 600m². Free feasibility.
HIA Member
MBA NSW0476 300 300Dual Occupancy Developments in Mortlake
A duplex in Mortlake works on the larger lots that clear the Canada Bay 600m2 minimum and sit off the heritage streets. This riverside suburb adjacent to Breakfast Point runs Federation cottages, inter-war heritage, post-war stock and contemporary on 400 to 800m2 blocks, and at a $1.9M to $3.5M market a Torrens-title duplex on a qualifying lot is a strong play with a ferry connection to Putney. Heritage Conservation Areas cover several streets, 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. On a qualifying non-heritage lot a side-by-side works cleanly, and some smaller lots fall short of 600. Where older homes carry fibro a licensed asbestos strip-out comes first.
What I would check first on your Mortlake block: whether it clears the 600m2 minimum, the heritage status, 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 Mortlake — 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 Mortlake from $750K
- City of Canada Bay Council DA and CDC approvals managed
- R2 and R3 zones — established dual occ. provisions
- Minimum lot size 600m² in Mortlake
- M–H — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near North Strathfield (2 km) / Mortlake ferry to Putney 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 riverside suburb adjacent to Breakfast Point runs Federation, inter-war, post-war and contemporary stock on 400 to 800m2 blocks.
At a $1.9M to $3.5M market a Torrens-title duplex on a qualifying lot off the heritage streets is a strong play, with a ferry to Putney.
Stable ground, heritage check
The Wianamatta Shale gives footings stable bearing, so a slab off geotech is routine on both dwellings.
Heritage sits on several streets, so the status check comes first, with older fibro stripped under licence.
Duplex builder in Mortlake — key facts
- Suburb
- Mortlake, NSW 2137
- Council / LGA
- City of Canada Bay Council (City of Canada Bay)
- Primary zoning
- R2 Low
- Typical lot size
- 400–800m²
- Soil class
- M–H
- Median house price
- $1.9M–$3.5M
- Home era
- 1900s–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
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Quality Promise
Buildana delivers Mortlake duplexes as a single project — one contractor accountable from site check to subdivision.
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 Mortlake block against City of Canada Bay 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 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.
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
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30-min free call — bring your block, your brief, your budget. We'll map out feasibility, timeline, and realistic cost. No sales pitch.
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Liverpool, NSW
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Last updated: 1 July 2025
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