Home Extension Builder Fairfield — From $150K Fixed Price
Fixed-price home extensions in Fairfield 2165. Rear extension $150K–$300K, second storey $300K–$500K. Fairfield City Council approvals managed. Free site consult.
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MBA NSW0476 300 300Quick Answer
A home extension in Fairfield costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Fairfield City Council approvals, and construction under one fixed-price contract.
Second-Storey & Rear Additions in Fairfield
A home extension in Fairfield is work in our own backyard — Buildana is based here, and we have measured, extended and rebuilt more homes in this suburb than anywhere in Sydney. The wide 450 to 700m² blocks under the mixed 1950s-80s stock carry real rear depth for the family-sized addition.
The honest checks are local knowledge here: the older fibro carries asbestos handled by licensed strip-out, the reactive pockets need footings engineered to move with the existing house, and on the R3 pockets I will tell you straight if a duplex outvotes the extension.
At the $950K to $1.2M median, extending beats upsizing almost every time — the stamp duty alone funds half a rear wing.
We build these fixed-price, licence HBL 487805C. Ask us to measure what your block can hold — we are five minutes away.
Buildana manages the complete home extension process in Fairfield — 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 Fairfield from $150K
- Fairfield City Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class M–H soil — structural engineering included
- 1950s–1980s-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Fairfield station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Our own backyard
Fairfield is home base — we know these streets block by block: which pockets carry the reactive clay, which eras hide the asbestos, and which R3 corners make a duplex the better call than an extension. That knowledge goes into every scope.
The wide blocks take a rear wing with second living, extra bedrooms and a second bathroom without crowding the yard.
The maths that keeps families here
At the $950K to $1.2M median, selling and buying bigger burns the cost of half an extension in stamp duty and fees — while the addition keeps the station, the schools and the community.
Asbestos strip-outs and engineered footings are priced upfront, never discovered late.
Home extension builder in Fairfield — key facts
- Suburb
- Fairfield, NSW 2165
- Council / LGA
- Fairfield City Council (Fairfield City)
- Primary zoning
- R2 Low Density & R3 Medium Density
- Typical lot size
- 450–700m²
- Soil class
- Class M–H
- Median house price
- $950K–$1.2M
- Home era
- 1950s–1980s
- 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
Real Project
Rear Ground Extension — Fairfield
1970s double-brick on an original 585sqm Fairfield block — we pushed the rear out 38sqm for a proper open-plan kitchen-living-dining and re-oriented the back wall with a 4-panel stacker onto a new covered alfresco. Retained the original front façade so the street presentation stayed consistent with the neighbours.
Completed in 13 weeks. Fixed-price $245,000. Didn't lodge a DA — fit cleanly under CDC.
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 |
|---|---|
| Small rear extension (up to 30m²) | $86,000 – $170,000 |
| Medium rear/side extension (30–60m²) | $170,000 – $300,000 |
| Large ground-floor extension (60–100m²) | $300,000 – $480,000 |
| Second-storey addition (60–120m²) | $270,000 – $520,000 |
| Wrap-around (ground + 1st floor) | $480,000+ |
| Structural engineering & tie-in | Included |
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. We assess your Fairfield home — existing structure, block size (450–700m²), R2 Low Density & R3 Medium Density 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 Fairfield home's streetscape. Multiple design options presented.
⏱The Fairfield construction phase. Fixed price, programmed, supervised. Documentation pack covers structural engineering for the new footings sized to match existing depths on Class M–H 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–H soil, structural connection to existing home, frame, fit-out, and finishes. Weekly updates from your project manager.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. 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
We Build Across Sydney
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.
Last updated: 1 April 2026
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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Fairfield 2165. Fairfield City Council regulations and local controls are covered on each page.