Duplex Builder Warriewood — CDC-Ready Designs, 15-Day Approval
Warriewood 2102 duplex specialists. Compliant design means CDC approval in ~15 business days, construction complete in 10–14 months. Feasibility within 48 hours.
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MBA NSW0476 300 300Quick Answer
A duplex in Warriewood costs $750,000–$1,500,000+ for dual occupancy construction. Attached duplex from $750K, detached from $1M. Buildana manages feasibility, Northern Beaches Council approvals, construction and subdivision under one fixed-price contract.
Dual Occupancy Developments in Warriewood
Warriewood splits into two suburbs for duplex purposes. The original streets carry blocks up to 800m² that clear the 600m² Pittwater-legacy minimum with margin. The Warriewood Valley Release Area runs master-planned lots down to 300m² that never will. Buyers regularly conflate the two because they share a postcode, but the older beach-side stock and the new estates sit on opposite sides of the feasibility line.
On the qualifying originals, the case is strong. $2.4M to $5M-plus medians, Warriewood Square and the beach anchoring demand, post-war homes ready to be replaced by pairs. Two ground conditions need pricing first, sandstone excavation on the rises, and coastal acid sulphate soils on the lagoon-margin lots that change how you excavate and dispose.
What I would check first on a Warriewood block: whether it is an original street or a Valley release lot, the sandstone or acid-sulphate ground, and the frontage. Those decide it.
We build these fixed-price, licence HBL 487805C. Both show up in a proper site assessment, which is exactly where we would start on your block.
Buildana manages the full duplex development process in Warriewood — 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 Warriewood 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 Warriewood
- 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 (Mona Vale interchange) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Two suburbs, one postcode
Warriewood splits for duplex purposes. The original streets carry blocks up to 800m² that clear the 600m² Pittwater-legacy minimum with margin, while the Warriewood Valley Release Area runs master-planned lots down to 300m² that never will.
Buyers conflate the two because they share a postcode, but the older beach-side stock and the new estates sit on opposite sides of the feasibility line. So the first job is placing your block.
Strong on the originals, priced for the ground
On the qualifying originals the case is strong: $2.4M to $5M-plus medians, Warriewood Square and the beach anchoring demand, and post-war homes ready to be replaced by pairs.
Two ground conditions need pricing first: sandstone excavation on the rises, and coastal acid sulphate soils on the lagoon-margin lots that change how you excavate and dispose. Both show up in a proper site assessment, where we start.
Duplex builder in Warriewood — key facts
- Suburb
- Warriewood, NSW 2102
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 300–800m² (master-planned + original)
- Soil class
- Hawkesbury Sandstone
- Median house price
- $2.4M–$5M+ (oceanfront)
- Home era
- 1920s–1960s heritage + 2010s+ master-planned + premium contemporary
- 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
Everything that has to be right before we touch the ground. We assess your Warriewood block — lot size (typical 300–800m² (master-planned + original)), width, R2 Low zoning, setbacks, FSR, landscaped area requirements under Northern Beaches Council's LEP and DCP. Minimum lot for duplex: 600m² (Manly/Pittwater legacy R2) / 700m² (Warringah legacy R2) / varies by precinct under Northern Beaches LEP. 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 Warriewood site. You approve final plans before we move to lodgement.
⏱The Warriewood 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 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 Northern Beaches Council clearance — important if you're planning to sell one side immediately to fund the next move.
⏱Quality Promise
We build duplexes in Warriewood end-to-end — feasibility, design, DA/CDC, dual-slab construction, subdivision. One contract.
Cost Guide
| Item | Estimated Range |
|---|---|
| Attached duplex (2 × 180–220m²) | $850,000 – $1,130,000 |
| Attached duplex (2 × 220–260m²) | $1,130,000 – $1,470,000 |
| Detached duplex (2 × 220–280m²) | $1,360,000 – $1,750,000 |
| Strata/Torrens subdivision | $17,000 – $34,000 |
| Demolition (if KDR duplex) | $20,000 – $45,000 |
| Council contributions | $11,000 – $68,000+ |
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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Liverpool, NSW
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Last updated: 1 July 2025
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