Licensed Home Extension Builder Warrawee
NSW licensed extension specialist. Warrawee 2074 extensions on 1920s–1960s (heavy heritage stock)-era homes require structural sign-off, Class M footings, and matched connection — we engineer and document properly.
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MBA NSW0476 300 300Quick Answer
A home extension in Warrawee 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.
Second-Storey & Rear Additions in Warrawee
A home extension in Warrawee is estate-grade work, and the pocket does not tolerate anything less. These are heritage homes on 900 to 1,500m² blocks in one of the North Shore line's most exclusive addresses, so a wing here has to be built behind the conserved frontage to a genuinely exacting standard — the kind of finish the street's values quietly enforce.
I check the heritage position before a line is drawn, because on streets like these the approval detail matters as much as the build. Pre-war fabric gets licensed handling for lead paint and asbestos, and the finish is pitched at the $3.2M-plus expectation the market takes as given.
With Knox and Abbotsleigh within walking distance, the reasons to stay are obvious, and extending is simply the sensible way to grow the house without surrendering the address.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with the heritage position checked, before you commit.
Buildana manages the complete home extension process in Warrawee — 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 Warrawee 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 Warrawee station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Estate-grade, or not at all
Warrawee's standing means the wing has to be exact — generous modern living behind the conserved heritage frontage, finished to the standard the pocket's values demand.
The 900 to 1,500m² blocks give the design genuine room to do that properly.
Heritage and pre-war hazards handled
The heritage position is checked before design, so the approval path is clear before you spend on drawings.
Pre-war hazards are handled as licensed processes, and all of it is priced into the job from the outset.
Home extension builder in Warrawee — key facts
- Suburb
- Warrawee, NSW 2074
- Council / LGA
- Ku-ring-gai Council (Ku-ring-gai)
- Primary zoning
- R2 Low Density
- Typical lot size
- 900–1,500m²
- Soil class
- Class M
- Median house price
- $3.2M–$4.6M
- 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 |
|---|---|
| Simple rear extension (single wall removal, no roof change) | $117,000 – $260,000 |
| Moderate extension (multiple openings, roof extended) | $260,000 – $490,000 |
| Complex extension (structural steel portals, re-roofing) | $490,000 – $780,000 |
| Second-storey tie-in (existing house re-engineered) | $460,000 – $850,000 |
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. Warrawee homes from the 1920s–1960s (heavy heritage stock) 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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Other Buildana services in Warrawee
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Warrawee 2074. Ku-ring-gai Council regulations and local controls are covered on each page.