Killara Home Extension Builder — Live In, Build On
Buildana extends homes across Killara 2071 while you stay in place. 1920s–1960s (heavy heritage stock)-era structure, Ku-ring-gai Council rules, weatherproofing during build — all managed locally from Fairfield.
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MBA NSW0476 300 300Quick Answer
A home extension in Killara 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.
Killara Home Extensions — Fixed Price
A home extension in Killara is Federation heritage on deep ground. The inter-war homes sit on 800 to 1,400m² blocks that often run back toward the valley, and that depth is the gift — the conserved frontage the street knows stays untouched, while generous modern living goes in behind it where nobody driving past will ever see it.
Two conditions shape the build. The heritage streets are checked before design so the approval is clear from the start, and on the valley fall the clay turns reactive, so the junction between the old house and the new wing is engineered to move as one. Pre-war fabric gets its lead paint and asbestos handled under licence either way.
At a $3.0M to $4.5M median, a wing done exactly right is simply the estate's natural next chapter — more house, same address, none of the cost of chasing size elsewhere in the catchment.
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 Killara — 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 Killara 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 Killara station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The deep blocks deliver
Killara's deep blocks give a wing genuine room — family living, extra bedrooms and a garden connection built behind the conserved Federation frontage, to the standard the heritage streets expect.
Where the block falls toward the valley, the outlook rewards a design that reaches for it.
Heritage, clay and fabric
The heritage position is checked before design, and on the valley fall the reactive clay gets an engineered footing junction between old and new.
Both pre-war hazards come out under licence, and with the valley-fall junction engineered, the whole lot sits in the fixed price upfront.
Home extension builder in Killara — key facts
- Suburb
- Killara, NSW 2071
- Council / LGA
- Ku-ring-gai Council (Ku-ring-gai)
- Primary zoning
- R2 Low Density
- Typical lot size
- 800–1,400m²
- Soil class
- Class M
- Median house price
- $3.0M–$4.5M
- 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.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Free consultation at your Killara 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 Killara 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 Killara.
⏱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.
⏱Quality Promise
Killara home extension specialists: we work on your home while you live in it, weatherproof the site nightly, finish clean.
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.
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
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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