Home Extension Builder Rosehill — From $150K Fixed Price
Fixed-price home extensions in Rosehill 2142. Rear extension $150K–$300K, second storey $300K–$500K. City of Parramatta Council approvals managed. Free site consult.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Rosehill costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, City of Parramatta Council approvals, and construction under one fixed-price contract.
Home Extension Builder in Rosehill
A home extension in Rosehill checks the racecourse-precinct plans first — the redevelopment conversation around the track reshapes the value map, and the wing is weighed against your block's position in it.
Beyond the precinct, the 1920s-1970s homes on 350 to 650m² blocks extend on the era read, with the older fabric licensed-handled.
At the $1.3M to $1.9M median, the wing on the settled streets is well-priced space beside Parramatta.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with the precinct position read, before you commit.
Buildana manages the complete home extension process in Rosehill — 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 Rosehill from $150K
- City of Parramatta Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1920s–1970s + apartment towers-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Rosehill (T1, in suburb) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The precinct read comes first
Rosehill's racecourse redevelopment conversation puts some blocks in play for value beyond any extension — I read your position against it before design money moves.
The settled streets beyond extend on the standard era logic.
Era handled properly
Lead paint joins asbestos on the pre-war fabric, licensed processes both, and the junctions are engineered on the clay.
Both come out under licence and the engineering is costed in from the start.
Home extension builder in Rosehill — key facts
- Suburb
- Rosehill, NSW 2142
- Council / LGA
- City of Parramatta Council (City of Parramatta)
- Primary zoning
- R2 Low
- Typical lot size
- 350–650m²
- Soil class
- M
- Median house price
- $1.3M–$1.9M
- Home era
- 1920s–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 |
|---|---|
| Small rear extension (up to 30m²) | $92,000 – $180,000 |
| Medium rear/side extension (30–60m²) | $180,000 – $330,000 |
| Large ground-floor extension (60–100m²) | $330,000 – $510,000 |
| Second-storey addition (60–120m²) | $290,000 – $560,000 |
| Wrap-around (ground + 1st floor) | $510,000+ |
| 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. Walk through your Rosehill home with our designer and structural engineer. We measure, photograph, and check the bones — footings, frame condition, roof structure. The cost estimate that follows is grounded in what we found, not a generic per-m² number. Our designer works with your existing home's layout — connecting new living areas to existing rooms, matching materials and roof pitch, and maximising natural light. You approve floor plans and 3D renders before we proceed.
⏱The Rosehill construction phase. Fixed price, programmed, supervised. Most rear extensions in Rosehill qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through City of Parramatta Council because of overshadowing and privacy assessments. We choose based on your design, not on what's easier to lodge. Extension built from new footings to completion — connecting structurally to your existing home. Class M soil design managed. Temporary weatherproofing maintains liveability where possible.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Walk through the completed extension, confirm finishes, collect your OC. Six-year structural warranty covers all new work including the junction with your existing home. Maintenance guide provided.
⏱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.
Last updated: 1 April 2026
Rosehill Extension — Free Consultation
Free design consultation for Rosehill 2142. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in Rosehill
Other Buildana services in Rosehill
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Rosehill 2142. City of Parramatta Council regulations and local controls are covered on each page.