Cromer Duplex Builder — Western Sydney Dual Occupancy
Buildana is a local Northern Beaches duplex builder. We know which Cromer streets support Torrens title subdivision, which suit strata, and what Northern Beaches Council will approve. Free site feasibility.
HIA Member
MBA NSW0476 300 300Dual Occupancy Developments in Cromer
A duplex in Cromer is a feasible dual-occupancy on the lots that clear the Northern Beaches 600m2 minimum, with bushfire and rock to plan for. This inland bushland-fringe suburb runs 1960s to 1980s brick on 550 to 800m2 blocks, so the larger lots clear 600 while smaller ones fall short. Perimeter lots backing the Narrabeen Lagoon catchment carry BAL-12.5 to BAL-29, so a duplex would carry that spec across two dwellings.
The ground is Hawkesbury Sandstone with rock excavation typical, so a duplex spreads that across two footprints. On a qualifying block off the worst bushfire ratings 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 Cromer block: whether it clears the 600m2 minimum, the BAL rating on perimeter lots, and the rock. 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 Cromer — 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 Cromer from $750K
- Northern Beaches Council DA and CDC approvals managed
- R2 and R3 zones — established dual occ. provisions
- Minimum lot size 600m² (Manly/Pittwater legacy R2) / 700m² (Warringah legacy R2) / varies by precinct under Northern Beaches LEP in Cromer
- Hawkesbury Sandstone — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near B-Line bus to CBD (Brookvale interchange) 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 inland bushland-fringe suburb runs 1960s to 1980s brick on 550 to 800m2 blocks, so the larger lots clear the Northern Beaches 600m2 minimum.
Perimeter lots backing the Narrabeen Lagoon catchment carry BAL-12.5 to BAL-29, so a duplex carries that spec across both dwellings.
Rock and bushfire
The Hawkesbury Sandstone means rock excavation typical, spread across both dwellings on a duplex.
On a qualifying block off the worst bushfire ratings a side-by-side works cleanly, with older fibro stripped under licence.
Duplex builder in Cromer — key facts
- Suburb
- Cromer, NSW 2099
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 550–800m²
- Soil class
- Hawkesbury Sandstone
- Median house price
- $2.0M–$2.8M
- Home era
- 1960s–1980s
- 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
We build duplexes in Cromer end-to-end — feasibility, design, DA/CDC, dual-slab construction, subdivision. One contract.
How It Works
From First Call to Final Key
Site visit, title search, and planning assessment for your Cromer block. We check lot dimensions against Northern Beaches Council's minimum (600m² (Manly/Pittwater legacy R2) / 700m² (Warringah legacy R2) / varies by precinct under Northern Beaches LEP), review overlays, drainage, access, and services.
⏱Design has to satisfy four audiences at once: Northern Beaches Council, the future buyer or tenant, the certifier, and you. Each pull in a different direction — our job is to land plans that work for all four.
⏱We lodge and chase your approval — DA through Northern Beaches Council for most duplexes, or CDC where eligible. R2 Low zoning in Cromer.
⏱Building both sides in parallel halves the loan interest holding cost vs sequential builds. Bulk material orders for cabinetry, tiles, fixtures cut unit cost.
⏱Strata or Torrens title subdivision completed. Separate OCs, individual metering, 6-year structural warranty per dwelling.
⏱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
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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