Home Extension Builder Rooty Hill — From $150K Fixed Price
Fixed-price home extensions in Rooty Hill 2766. Rear extension $150K–$300K, second storey $300K–$500K. Blacktown City Council approvals managed. Free site consult.
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MBA NSW0476 300 300Quick Answer
A home extension in Rooty Hill costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Blacktown City Council approvals, and construction under one fixed-price contract.
Extending Homes in Rooty Hill
A home extension in Rooty Hill runs about the strongest value maths in the west. At a $750K to $950K median, the sheer cost of trading up — stamp duty, agents, the move — would build you a genuine rear wing on its own, and most of the 1970s to 1990s stock here has the bones to take one. You spend on rooms you keep rather than fees you never see again.
Brick from this era extends cleanly at ground level. The older homes get a fibro check with a licensed strip-out where it turns up. Parts of Rooty Hill sit on reactive clay, so where the new wing meets the old the footing junction is engineered to move with the house rather than crack against it.
The station and the entertainment precinct keep the fundamentals of the place practical, and the 550 to 700m² blocks have the depth for a full family plan.
We build these fixed-price, licence HBL 487805C. Ask us to measure what your block can hold.
Buildana manages the complete home extension process in Rooty Hill — 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 Rooty Hill from $150K
- Blacktown 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 Rooty Hill station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The value maths of the west
At Rooty Hill's entry point the cost of upsizing effectively pays for the addition itself, and the 550 to 700m² blocks have the depth for a full family plan — second living, bedrooms, alfresco.
The station and entertainment precinct keep the fundamentals of daily life practical through the build.
Fibro and reactive clay sorted
Older stock gets checked for fibro, and a licensed strip-out clears whatever is found.
Where the clay pockets are reactive, the old-to-new footing junction is engineered to move as one, and that sits inside the fixed price from the outset.
Home extension builder in Rooty Hill — key facts
- Suburb
- Rooty Hill, NSW 2766
- Council / LGA
- Blacktown City Council (Blacktown City)
- Primary zoning
- R2 Low Density
- Typical lot size
- 550–700m²
- Soil class
- Class M–H
- Median house price
- $750K–$950K
- 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?
Free site assessment, fixed-price contract, line-itemised quote within 48 hours. No high-pressure sales — just a real builder talking real numbers.
How It Works
From First Call to Final Key
We assess your Rooty Hill home — existing structure, block size (550–700m²), R2 Low 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 Rooty Hill home's streetscape. Multiple design options presented.
⏱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.
⏱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.
⏱Quality Promise
Rooty Hill home extension specialists: we work on your home while you live in it, weatherproof the site nightly, finish clean.
Cost Guide
| Item | Estimated Range |
|---|---|
| Adding a master suite (1970s–1990s Rooty Hill home) | $120,000 – $260,000 |
| Kitchen/living open-out to backyard | $140,000 – $330,000 |
| Second storey for teenagers/office | $260,000 – $510,000 |
| Extension + bathroom (growing family) | $190,000 – $370,000 |
| Full rear + roof tie-in (entertainer's zone) | $330,000 – $560,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
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
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 Rooty Hill 2766. Blacktown City Council regulations and local controls are covered on each page.