Home Extension Bonnyrigg Heights — Design, Approval, Structural, Build
Full-service extensions in Bonnyrigg Heights 2177: structural survey of existing 1970s–1990s home, design, Fairfield City Council approval, engineering, weatherproofed construction, matched finish to original dwelling.
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A home extension in Bonnyrigg Heights 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 Bonnyrigg Heights
A home extension in Bonnyrigg Heights is the quiet upgrade families here tend to land on. The 1970s to 1990s homes sit on well-sized blocks with room to spare, so a rear addition adds the bedroom and living space a growing household needs without moving out of a pocket people genuinely like. At a $950K to $1.2M median, the cost of selling and buying bigger would eat most of the build anyway.
The stock is mostly brick veneer, which extends cleanly at ground level and only goes up with steel, so out is the sensible direction on these blocks. There is no heritage overlay and no exotic soil regime to work around for most of the suburb, which keeps the build predictable. Edensor Park Recreation Reserve and the local shops anchor a settled family area.
What I would check first on your Bonnyrigg Heights house: the frame type and the rear yard depth. Neither heritage nor difficult ground complicates it, so the scope stays clean.
We build these fixed-price, licence HBL 487805C. Buildana is based in the Fairfield LGA, so ask us out for a look.
Buildana manages the complete home extension process in Bonnyrigg Heights — 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 Bonnyrigg Heights from $150K
- Fairfield City Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class M–H soil — structural engineering included
- 1970s–1990s-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Cabramatta (4 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The family upgrade
The 1970s to 1990s homes sit on well-sized blocks with room to spare, so a rear addition adds the bedroom and living space a growing household needs without leaving the pocket.
At a $950K to $1.2M median, selling and buying bigger would eat most of the build in friction, which is why extending wins here.
Clean and predictable
The stock is mostly brick veneer, which extends cleanly at ground level and only goes up with steel, so out is the sensible direction on these blocks.
There is no heritage overlay and no exotic soil regime for most of the suburb, which keeps the build predictable. Buildana works the Fairfield LGA constantly.
Home extension builder in Bonnyrigg Heights — key facts
- Suburb
- Bonnyrigg Heights, NSW 2177
- Council / LGA
- Fairfield City Council (Fairfield City)
- Primary zoning
- R2 Low Density
- Typical lot size
- 450–700m²
- Soil class
- Class M–H
- Median house price
- $950K–$1.2M
- Home era
- 1970s–1990s
- 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?
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Cost Guide
| Item | Estimated Range |
|---|---|
| Simple rear extension (single wall removal, no roof change) | $86,000 – $190,000 |
| Moderate extension (multiple openings, roof extended) | $190,000 – $360,000 |
| Complex extension (structural steel portals, re-roofing) | $360,000 – $570,000 |
| Second-storey tie-in (existing house re-engineered) | $330,000 – $620,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
The first job on an extension is finding out what you're extending onto. Bonnyrigg Heights homes from the 1970s–1990s were built to different standards — we open walls, check footings, verify load paths. The existing house has to carry the new work.
⏱Design follows the existing roof. A bad extension looks like a bolt-on; a good one reads as original. Matched brickwork or contrasting render (whichever the architecture calls for), tied-in roofline, continuous flooring where it should be continuous.
⏱Construction happens while you live in the house. That means weatherproofing every night, staging the works so kitchens and bathrooms don't disappear on the same week, and keeping the site clean of debris that doesn't belong in a family home.
⏱Finish is seamless. Paint match, floor match, roofline match, brick match where possible. The only way to tell the extension is new is the date on the plans.
⏱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
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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Free design consultation for Bonnyrigg Heights 2177. We'll assess your home, design the extension, and provide a fixed-price quote.
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Other Buildana services in Bonnyrigg Heights
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Bonnyrigg Heights 2177. Fairfield City Council regulations and local controls are covered on each page.