Duplex Builder Seven Hills — Dual Occupancy Specialists
Fixed-price duplex construction in Seven Hills 2147. Feasibility, design, Blacktown City Council approvals and building — all under one contract. Free feasibility assessment.
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A duplex in Seven Hills costs $750,000–$1,500,000+ for dual occupancy construction. Attached duplex from $750K, detached from $1M. Buildana manages feasibility, Blacktown City Council approvals, construction and subdivision under one fixed-price contract.
Duplex Builder in Seven Hills
Seven Hills has generous block sizes — many exceeding 650m² — and R2 zoning that now supports dual occupancy under the July 2024 reform. The suburb's family-friendly character, proximity to Seven Hills station, and strong rental demand make it an excellent duplex investment location. Blacktown City Council requires minimum lot widths and landscaped area controls — Buildana's feasibility team assesses all of this upfront.
Buildana manages the full duplex development process in Seven Hills — 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 Seven Hills from $750K
- Blacktown City Council DA and CDC approvals managed
- R2 zoning — eligible under July 2024 reform
- Minimum lot size 600m² in Seven Hills
- Class H soil — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near Seven Hills station
Have a question about your project?
Talk to our team — free site assessment and fixed-price quote.
How It Works
From First Call to Final Key
We assess your Seven Hills block — lot size (typical 550–700m²), width, R2 Low Density zoning, setbacks, FSR, landscaped area requirements under Blacktown City Council's LEP and DCP. Minimum lot for duplex: 600m². You'll know viability before spending on design.
⏱Dual occupancy floor plans designed for your Seven Hills block — attached or detached configuration, vehicle access, private open space, and full Blacktown City Council compliance.
⏱DA through Blacktown City Council (40–90 days) or CDC (10–15 business days). Seven Hills is zoned R2 Low Density. Construction Certificate obtained before works commence.
⏱Both dwellings built simultaneously — engineered slabs (Class H soil), frame, lock-up, fit-out. Milestone updates from your project manager.
⏱Strata or Torrens title subdivision completed. Separate OCs, individual metering, 6-year structural warranty per dwelling. Strong rental demand near Seven Hills station.
⏱Quality Promise
Every Buildana duplex in Seven Hills is built under a fixed-price contract — feasibility through to dual handover and subdivision.
Our Team
Oliver Alameri
Founder / Director / Builder
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
Estimate Your Build Cost
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Cost Guide
| Item | Estimated Range |
|---|---|
| Attached duplex (entry) | $750,000 – $1,000,000 |
| Detached duplex (mid) | $1,000,000 – $1,300,000 |
| Premium duplex | $1,300,000+ |
| Demolition (if KDR duplex) | $18,000 – $40,000 |
| Strata/Torrens subdivision | $15,000 – $30,000 |
| Council contributions | $10,000 – $60,000+ |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
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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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Buildana builds across greater Sydney — with deep roots in Western Sydney's Fairfield, Liverpool, Cumberland, Canterbury-Bankstown, and Blacktown LGAs.
Last updated: 1 July 2025
Build a Duplex in Seven Hills
Free duplex feasibility assessment for Seven Hills 2147. We'll check your block, estimate yield, and provide a fixed-price budget.
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