Home Extension Builder Mount Annan — From $150K Fixed Price
Fixed-price home extensions in Mount Annan 2567. Rear extension $150K–$300K, second storey $300K–$500K. Camden Council approvals managed. Free site consult.
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MBA NSW0476 300 300Quick Answer
A home extension in Mount Annan costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Camden Council approvals, and construction under one fixed-price contract.
Extending Homes in Mount Annan
A home extension in Mount Annan is the classic outgrown-family fix. This sought-after Camden suburb runs 1990s to 2000s brick homes on 450 to 700m² R2 blocks, built for buyers who now have more kids than bedrooms, and a rear addition across the back is the standard answer. At a $1.1M to $1.5M median in a strong school catchment, extending to stay beats trading up out of the zone.
The stock extends cleanly. Brick veneer from this era takes a ground-floor addition well and needs steel to go up, so out is the sensible direction, and the block depth makes it easy without crowding the yard. The Australian Botanic Garden on the eastern edge and Mount Annan High anchor the family demographic that keeps owners here.
What I would check first on your Mount Annan house: the frame type and the rear yard depth. The stock and blocks are straightforward, so the scope stays clean.
We build these fixed-price, licence HBL 487805C. Tell us the rooms you are short and we will draw the answer.
Buildana manages the complete home extension process in Mount Annan — 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 Mount Annan from $150K
- Camden Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1990s–2000s brick + premium contemporary-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Macarthur (6 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Built for fewer kids
This Camden suburb runs 1990s to 2000s brick homes on 450 to 700m² R2 blocks, built for buyers who now have more kids than bedrooms, and a rear addition is the standard answer.
At a $1.1M to $1.5M median inside a strong school catchment, extending to stay beats trading up and out of the zone.
Clean, straightforward build
Brick veneer from this era takes a ground-floor addition well and wants steel to go up, so out is the sensible direction, and the block depth keeps it easy without crowding the yard.
The Australian Botanic Garden and Mount Annan High anchor the family demographic that keeps owners here.
Home extension builder in Mount Annan — key facts
- Suburb
- Mount Annan, NSW 2567
- Council / LGA
- Camden Council (Camden Council)
- Primary zoning
- R2 Low Density predominant
- Typical lot size
- 300–500m² master-planned (Oran Park/Spring Farm/Gledswood Hills/Harrington Park/Mount Annan); 600–900m² older Camden/Narellan; 1ha+ acreage (Cobbitty/Bickley Vale/Brownlow Hill/Werombi)
- Soil class
- M
- Median house price
- $1.1M–$1.5M
- Home era
- 1990s–2000s brick + premium contemporary
- 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 |
|---|---|
| Simple rear extension (single wall removal, no roof change) | $90,000 – $200,000 |
| Moderate extension (multiple openings, roof extended) | $200,000 – $380,000 |
| Complex extension (structural steel portals, re-roofing) | $380,000 – $600,000 |
| Second-storey tie-in (existing house re-engineered) | $350,000 – $650,000 |
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. Mount Annan homes from the 1990s–2000s brick + premium contemporary 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
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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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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