Licensed Home Extension Builder Kensington
NSW licensed extension specialist. Kensington 2033 extensions on 1900s–1960s + apartments-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 Kensington costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Randwick City Council approvals, and construction under one fixed-price contract.
Kensington Home Extensions — Fixed Price
A home extension in Kensington has to read purpose and zoning together, because the suburb runs two economies at once. There are family households behind the conserved cottage frontages, and there is the UNSW rental engine driving robust, lettable additions — and the R3/R4 corridors along Anzac Parade carry development value that a big spend should be weighed against first.
So the design is scoped to your actual purpose rather than a template: a family wing that lives well for decades, or a durable addition built to earn its keep near the university. Pre-war fabric has lead paint and asbestos dealt with under licence either way.
At a $2.2M to $4M median, an addition beats the cost of upsizing beside the university — the position is the asset, whichever economy you are building for.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with the zoning checked, before you commit.
Buildana manages the complete home extension process in Kensington — 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 Kensington from $150K
- Randwick City Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1900s–1960s + apartments-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Light Rail Kensington / Kingsford station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Two purposes, one suburb
Kensington splits by purpose — family wings behind the conserved cottage frontages, and robust additions that feed the UNSW rental engine — with the R3/R4 corridors checked before any big spend.
I scope to your purpose from the first conversation rather than assuming one shape fits all.
Fabric handled properly
Lead paint and asbestos on the pre-war fabric are each handled as licensed processes.
That work is priced into the job from the outset rather than tacked on later.
Home extension builder in Kensington — key facts
- Suburb
- Kensington, NSW 2033
- Council / LGA
- Randwick City Council (Randwick)
- Primary zoning
- R2 Low
- Typical lot size
- 250–600m²
- Soil class
- M
- Median house price
- $2.2M–$4M
- Home era
- 1900s–1960s + apartments
- 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) | $95,000 – $210,000 |
| Moderate extension (multiple openings, roof extended) | $210,000 – $400,000 |
| Complex extension (structural steel portals, re-roofing) | $400,000 – $630,000 |
| Second-storey tie-in (existing house re-engineered) | $370,000 – $680,000 |
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. Kensington homes from the 1900s–1960s + apartments 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
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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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Kensington 2033. Randwick City Council regulations and local controls are covered on each page.