Duplex Builder Henley — CDC-Ready Designs, 15-Day Approval
Henley 2111 duplex specialists. Compliant design means CDC approval in ~15 business days, construction complete in 10–14 months. Feasibility within 48 hours.
HIA Member
MBA NSW0476 300 300Dual Occupancy Developments in Henley
A duplex in Henley is rarely feasible, because most lots fall short of the Hunters Hill 1,000m2 minimum, and near-total heritage plus deep rock add further constraint. This small Parramatta River foreshore suburb runs Federation and inter-war heritage on 500 to 1,200m2 blocks with substantial fall to the river, so only the largest clear 1,000 while most do not. Heritage Conservation Areas cover most streets, so a dual-occupancy is constrained or precluded on contributory lots, and a single premium home is usually the honest call.
The sandstone-dominant soil means deep rock excavation is typical, so a duplex on a qualifying large lot doubles a very high site cost. Where a rare lot clears 1,000m2 off the heritage streets a duplex might work, but most do not, so I would rather be straight. Where the existing home carries fibro a licensed asbestos strip-out comes first.
What I would check first on your Henley block: whether it clears the 1,000m2 Hunters Hill minimum, the heritage status, and the deep rock. That decides the direction.
We build these fixed-price, licence HBL 487805C. Send me the address and I will tell you honestly whether it is a duplex site.
Buildana manages the full duplex development process in Henley — 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 Henley from $750K
- Hunters Hill Council DA and CDC approvals managed
- R2 and R3 zones — established dual occ. provisions
- Minimum lot size 1,000m² under Hunters Hill DCP 2013 (highest in Sydney — heritage protection) in Henley
- Hawkesbury Sandstone bedrock — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near Wollstonecraft (5 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Most lots fall short of 1,000m2
This foreshore suburb runs Federation and inter-war heritage on 500 to 1,200m2 blocks, so only the largest clear the Hunters Hill 1,000m2 minimum.
Conservation Areas cover most streets, so a dual-occupancy is constrained or precluded, and a single premium home is usually the call.
Deep rock
The sandstone-dominant soil means deep rock excavation is typical across both dwellings on a duplex.
A duplex on a qualifying large lot doubles a very high site cost, with older fibro stripped under licence first.
Duplex builder in Henley — key facts
- Suburb
- Henley, NSW 2111
- Council / LGA
- Hunters Hill Council (Hunters Hill Council)
- Primary zoning
- R2 Low Density
- Typical lot size
- 500–1,200m²
- Soil class
- Hawkesbury Sandstone bedrock
- Median house price
- $3.5M–$6.5M typical heritage; $5.0M–$15M+ harbour-front Woolwich/Hunters Hill peninsula
- Home era
- 1880s–1940s Federation/Victorian/inter-war heritage predominant
- 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.
Quality Promise
Our Henley duplex projects run from feasibility to subdivision under one builder. Fixed price, dual handover, full compliance.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. We assess your Henley block — lot size (typical 500–1,200m²), width, R2 Low Density zoning, setbacks, FSR, landscaped area requirements under Hunters Hill Council's LEP and DCP. Minimum lot for duplex: 1,000m² under Hunters Hill DCP 2013 (highest in Sydney — heritage protection). You'll know viability before spending on design. Design phase covers unit layout, access, parking, private open space, and waste management for dual occupancy on your Henley site. You approve final plans before we move to lodgement.
⏱The Henley construction phase. Fixed price, programmed, supervised. Duplex approvals get scrutinised harder than single dwellings — neighbour notification, overshadowing, privacy, traffic, waste. Our SEE addresses each on the front foot rather than reactively. Cleaner submission, fewer conditions, faster CC. Fixed-price construction of both dwellings from slab to keys. Class Hawkesbury Sandstone bedrock engineered footings, frame, lock-up, internal fit-out, and external works. Weekly progress reports.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Subdivision registration starts in parallel with final fitout so titles issue close to handover, not 6 months after. Buildana coordinates the surveyor and Hunters Hill Council clearance — important if you're planning to sell one side immediately to fund the next move.
⏱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
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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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Henley 2111. Hunters Hill Council regulations and local controls are covered on each page.