Duplex Builder Ermington — CDC-Ready Designs, 15-Day Approval
Ermington 2115 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 300Duplex Builder in Ermington
The duplex case in Ermington is a top-of-the-range story. Parramatta wants 600m² and the suburb runs 450 to 700m², so the 1950s to 1970s homes on the fuller blocks qualify while the tighter lots do not. Worth knowing your position on the map too. The streets falling toward the Parramatta River sit on Class P/E alluvial ground, and two dwellings on deep alluvium means piering that a mid-suburb shale block simply does not need.
Why bother? Because Ermington's numbers still work. Medians at $1.4M to $2.0M keep it one of the cheaper qualifying entry points in the Parramatta LGA, light rail is 2km away at Rydalmere, and the Defence-site redevelopment is pulling the whole riverside strip upmarket.
What I would check first on an Ermington block: whether it clears 600m², whether it sits on river alluvium needing piering, and the frontage. Those set the feasibility.
We build these fixed-price, licence HBL 487805C. Send us your address and we will check the 600m² line and the soil map in the same pass.
Buildana manages the full duplex development process in Ermington — 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 Ermington from $750K
- City of Parramatta Council DA and CDC approvals managed
- R2 and R3 zones — established dual occ. provisions
- Minimum lot size 600m² (R2) under Parramatta DCP 2023 in Ermington
- M — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near Bus to Rydalmere (Parramatta Light Rail, 2 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
A top-of-the-range qualification
Parramatta's 600m² minimum against Ermington's 450 to 700m² blocks means the 1950s to 1970s homes on the fuller lots qualify while the tighter ones do not. So the first job is confirming your block clears the line, because a top-of-the-range suburb rewards a title check before a design.
At a $1.4M to $2.0M median it is one of the cheaper qualifying entry points in the Parramatta LGA, with light rail 2km away at Rydalmere and the Defence-site redevelopment lifting the riverside strip.
River alluvium changes the footings
Position on the map matters. The streets falling toward the Parramatta River sit on Class P/E alluvial ground, and two dwellings on deep alluvium means piering that a mid-suburb shale block does not need.
That is real cost on a two-dwelling budget, so we check the soil map alongside the 600m² line. Send us the address and we will do both in one pass.
Duplex builder in Ermington — key facts
- Suburb
- Ermington, NSW 2115
- Council / LGA
- City of Parramatta Council (City of Parramatta)
- Primary zoning
- R2 Low
- Typical lot size
- 450–700m²
- Soil class
- M
- Median house price
- $1.4M–$2.0M
- Home era
- 1950s–1970s + 2010s+ apartments
- 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
Every Buildana duplex in Ermington is built under a fixed-price contract — feasibility through to dual handover and 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 Ermington block against City of Parramatta 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
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
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Fatima Al-Rashid
Liverpool, NSW
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Last updated: 1 July 2025
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Free duplex feasibility assessment for Ermington 2115. We'll check your block, estimate yield, and provide a fixed-price budget.
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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Ermington 2115. City of Parramatta Council regulations and local controls are covered on each page.