Duplex Builder Mascot — CDC-Ready Designs, 15-Day Approval
Mascot 2020 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 Mascot costs $750,000–$1,500,000+ for dual occupancy construction. Attached duplex from $750K, detached from $1M. Buildana manages feasibility, Bayside Council approvals, construction and subdivision under one fixed-price contract.
Mascot Duplex Construction
A duplex in Mascot is usually the wrong product, because this commercial centre adjoining Sydney Airport is an R4 apartment-tower precinct, not a dual-occupancy market. The post-war brick, former industrial conversions and apartment towers sit on 300 to 600m2 blocks, and R4 zoning dominates around the station with heavy high-rise redevelopment, so density is the highest use. On a rare quiet lot a duplex might work, but the density zoning and tight lots usually point elsewhere.
The ground is Botany Sands with an elevated water table, so footings are engineered off geotech, industrial-legacy contamination is checked on remediated parcels, and severe ANIP flight-path overlays mean acoustics are planned in. I would rather give you the honest read than push the wrong product. Where older homes carry fibro a licensed asbestos strip-out comes first.
What I would check first on your Mascot block: the zoning and whether density beats a duplex, any contamination and the sandy ground, and the flight-path acoustics. That decides the best use.
We build these fixed-price, licence HBL 487805C. Send me the address and I will tell you honestly what the block suits.
Buildana manages the full duplex development process in Mascot — 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 Mascot from $750K
- Bayside Council DA and CDC approvals managed
- R2 and R3 zones — established dual occ. provisions
- Minimum lot size 600m² (Bayside DCP — R2 dual occupancy) in Mascot
- M — engineered dual-slab design included
- Strata or Torrens title subdivision available
- 6-year structural warranty per dwelling
- Free feasibility check — near Mascot (T8, in suburb) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
An R4 tower precinct
This commercial centre adjoining Sydney Airport runs post-war brick, industrial conversions and towers on 300 to 600m2 blocks.
R4 zoning dominates around the station with heavy high-rise redevelopment, so density is the highest use, not a duplex.
Sandy ground and overlays
The Botany Sands soil with an elevated water table means footings engineered off geotech, with contamination checked on remediated parcels.
Severe ANIP flight-path overlays mean acoustics are planned in, with older fibro stripped under licence first.
Duplex builder in Mascot — key facts
- Suburb
- Mascot, NSW 2020
- Council / LGA
- Bayside Council (Bayside)
- Primary zoning
- R2 Low
- Typical lot size
- 300–600m²
- Soil class
- M
- Median house price
- $1.5M–$2.3M
- Home era
- 1940s–1970s + apartment towers
- 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.
Cost Guide
| Item | Estimated Range |
|---|---|
| Attached duplex (2 × 180–220m²) | $730,000 – $970,000 |
| Attached duplex (2 × 220–260m²) | $970,000 – $1,260,000 |
| Detached duplex (2 × 220–280m²) | $1,160,000 – $1,500,000 |
| Strata/Torrens subdivision | $15,000 – $29,000 |
| Demolition (if KDR duplex) | $17,000 – $39,000 |
| Council contributions | $10,000 – $58,000+ |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Feasibility covers the planning side and the financial side. Yes-or-no on whether the block supports dual occupancy under Bayside Council controls, plus indicative end values, build cost, and likely yield. The point is to kill bad sites before you spend on design — not after. Dual occupancy floor plans designed for your Mascot block — attached or detached configuration, vehicle access, private open space, and full Bayside Council compliance.
⏱The Mascot construction phase. Fixed price, programmed, supervised. Full approval management: Statement of Environmental Effects, plans, reports, and all supporting documentation lodged with Bayside Council or private certifier. We handle RFIs and conditions. CC follows. Construction follows a tight programme: dual slabs in one mobilisation, paired frame stand, simultaneous lock-up, then trades rotate between sides for fit-out so no day is lost waiting on availability. The schedule is engineered, not optimistic.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Both dwellings handed over with individual Occupation Certificates. Subdivision lodged for separate titles. Separate metering installed. 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
Mascot Dual Occupancy — Free Feasibility
Free duplex feasibility assessment for Mascot 2020. We'll check your block, estimate yield, and provide a fixed-price budget.
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Other Buildana services in Mascot
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Mascot 2020. Bayside Council regulations and local controls are covered on each page.