Licensed Home Extension Builder Roseville Chase
NSW licensed extension specialist. Roseville Chase 2069 extensions on 1920s–1960s (heavy heritage stock)-era homes require structural sign-off, Class M footings, and matched connection — we engineer and document properly.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Roseville Chase costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Ku-ring-gai Council approvals, and construction under one fixed-price contract.
Roseville Chase Home Extensions & Additions
A home extension in Roseville Chase is about earning the water. The blocks run 700 to 1,400m² down toward Middle Harbour, and a wing that does not open the home to that setting is a wasted opportunity — so the design turns the living toward the view and is engineered down the fall where the lots drop away.
How much engineering depends on where you sit. On the steeper falling lots, suspended structure and retaining are real, planned line items, not afterthoughts. On the older inland streets, the heritage position is what needs checking before a line is drawn.
At a $3.0M to $5.5M median, a wing that captures the outlook is simply a sound investment — the setting is already yours, and the extension is what finally makes the house live up to it.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with fall and heritage resolved, before you commit.
Buildana manages the complete home extension process in Roseville Chase — 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 Roseville Chase from $150K
- Ku-ring-gai Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class M soil — structural engineering included
- 1920s–1960s (heavy heritage stock)-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Roseville (2 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Earn the outlook
The harbour setting is Roseville Chase's premium, and the wing is built to earn it — living opened toward the water, glazing that works the view, engineered properly down the fall where the lots drop.
The 700 to 1,400m² blocks give the design generous room to do that.
Fall and heritage handled
Suspended structure and retaining are engineered early on the falling lots, so the fall shapes the plan rather than surprising the budget.
The older inland streets get their heritage check before design, and all of it is priced into the job from the outset.
Home extension builder in Roseville Chase — key facts
- Suburb
- Roseville Chase, NSW 2069
- Council / LGA
- Ku-ring-gai Council (Ku-ring-gai)
- Primary zoning
- R2 Low Density
- Typical lot size
- 700–1,400m²
- Soil class
- Class M
- Median house price
- $3.0M–$5.5M
- Home era
- 1920s–1960s
- 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) | $117,000 – $230,000 |
| Medium rear/side extension (30–60m²) | $230,000 – $420,000 |
| Large ground-floor extension (60–100m²) | $420,000 – $650,000 |
| Second-storey addition (60–120m²) | $360,000 – $720,000 |
| Wrap-around (ground + 1st floor) | $650,000+ |
| 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. Free consultation at your Roseville Chase home. We inspect the existing structure, check Ku-ring-gai Council's controls, measure available space, and discuss what you need. You get a clear scope, budget range, and timeline before committing. Two design moves are usually on the table: match the existing house so the extension reads as original, or contrast with it so the new section is clearly modern. Both work — choice is aesthetic, and we'll show 3D renders of both before you commit.
⏱The Roseville Chase construction phase. Fixed price, programmed, supervised. CDC (10–15 business days) or DA through Ku-ring-gai Council depending on scope. Structural engineering, BASIX, and all documentation prepared and lodged. Construction Certificate obtained. Construction phase connects new to existing — footings, frame, roof tie-in, waterproofing at junction, internal fit-out and external finish. Staged works minimise disruption to your daily routine in Roseville Chase.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Final inspection focuses on the integration: paint blend, flooring transitions, ceiling height, junction waterproofing, sound transmission. The extension shouldn't feel bolted on — it should feel like the house was always meant to be this size.
⏱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
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