Home Extension Builder Mascot — Approved in 60 Days
Mascot 2020 extensions with tight approval timelines. CDC where eligible (~15 days), DA via Bayside Council in 40–60 days. Construction 12–24 weeks depending on scope.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Mascot costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Bayside Council approvals, and construction under one fixed-price contract.
Mascot Home Extensions — Fixed Price
A home extension in Mascot lives or dies on the acoustics. This close to the runway, the highest-value line in the whole scope is not the glazing package for looks — it is the engineered glass, seals and insulation that turn the interior into a genuinely quiet room under the approach.
Near the station the R4 precinct carries tower value, so I check the zoning before any wing, and the post-war fabric gets the asbestos check with the reclaimed sands read before excavation.
At a $1.5M to $2.3M median the wing on the quieter brick streets is well-priced space this close to the airport and the CBD.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with zoning and acoustics resolved, before you commit.
Buildana manages the complete home extension process in Mascot — from design consultation and structural engineering through to DA or CDC approval, and fixed-price construction to handover. Extend your home without the stress.
Read our Home Extension Cost Guide 2026 or explore extension approval pathways in NSW.
- Home extensions in Mascot from $150K
- Bayside Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1940s–1970s + apartment towers-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — 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
Engineer the quiet first
Under the approach the sound is the design problem, so the acoustic package leads the scope — engineered glazing and sealing that make the inside a different world to the outside.
The airport-and-CBD position keeps demand for the finished home real.
Zoning, era and sands
Near the station the R4 tower value gets checked before the wing, so the spend is not stranded under redevelopment territory.
The post-war fabric gets the asbestos check and the sands are read before excavation — all costed up front.
Home extension 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
- $150,000 – $600,000+
- Typical timeline
- 6–12 months design to handover
- Approval pathway
- CDC for most rear extensions, DA for second-storey
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 |
|---|---|
| Single-room addition (bedroom/study) | $58,000 – $140,000 |
| Kitchen/living extension | $150,000 – $340,000 |
| Master suite + ensuite addition | $130,000 – $270,000 |
| Second storey (full or partial) | $270,000 – $530,000 |
| Multi-room ground floor wrap | $340,000 – $580,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
We assess your Mascot home — existing structure, block size (300–600m²), R2 Low zoning, setbacks, FSR, and your space requirements. You'll know what's achievable before spending on detailed design.
⏱Design phase covers the extension layout, junction with existing structure, window and door placement, and external finish to match your Mascot home's streetscape. Multiple design options presented.
⏱Documentation pack covers structural engineering for the new footings sized to match existing depths on Class M soil, BASIX 2025 compliance, shadow diagrams to neighbours' POS, hydraulic, and detailed sections through the wall-tie junction. Approval-grade, not concept-grade.
⏱Fixed-price construction of your extension. New footings engineered for Class M soil, structural connection to existing home, frame, fit-out, and finishes. Weekly updates from your project manager.
⏱Handover documentation covers the new work specifically — OC for the extension, structural certs, BASIX certificate updates, and warranty for the new section plus the junction detailing. Existing house remains under whatever warranty position applied before.
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
Estimate Your Build Cost
Use our free calculator to get an instant cost estimate for your project
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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Headquartered in Western Sydney's Fairfield. Active across all 28 metropolitan Sydney LGAs — from Penrith to the Eastern Suburbs, the Hills to the Sutherland Shire.
Add Space to Your Mascot Home
Free design consultation for Mascot 2020. We'll assess your home, design the extension, and provide a fixed-price quote.
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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.