Licensed Home Extension Builder Bellevue Hill
NSW licensed extension specialist. Bellevue Hill 2023 extensions on 1900s–1940s heritage mansions-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 Bellevue Hill costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Woollahra Municipal Council approvals, and construction under one fixed-price contract.
Extending Homes in Bellevue Hill
A home extension in Bellevue Hill is grand architecture at grand scale, and the work has to earn the company it keeps. The homes are Federation mansions, Tudor and Mission houses on 500 to 2,000m² blocks, so the wing has to respect the defining character of the original while adding the living a modern family actually uses — a bolt-on that fights the house is money set alight.
Heritage is read street by street here, not assumed, and the north-facing harbour fall is engineered to make the most of the outlook. The pre-war fabric has its lead paint and asbestos processed under licence throughout.
At a $6M to $25M-plus median, the wing either matches the address or it costs you at sale — there is no middle ground on architecture like this, so it is built to the standard the street already sets.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with heritage and fall resolved, before you commit.
Buildana manages the complete home extension process in Bellevue 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 Bellevue Hill from $150K
- Woollahra Municipal Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1900s–1940s heritage mansions-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Edgecliff (3 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Respect the architecture, add the life
Bellevue Hill's Tudor, Mission and Federation homes deserve wings that respect the defining character — additions matched to the architecture, opened to the harbour fall where the north slope allows.
On blocks up to 2,000m², the scale of the work matches the address.
Heritage checked, fabric handled
Heritage positions are checked street by street rather than assumed, so the approval path is clear before design.
The pre-war hazards run as licensed processes, and all of it is priced into the job from the outset.
Home extension builder in Bellevue Hill — key facts
- Suburb
- Bellevue Hill, NSW 2023
- Council / LGA
- Woollahra Municipal Council (Woollahra)
- Primary zoning
- R2 Low
- Typical lot size
- 500–2,000m²
- Soil class
- M
- Median house price
- $6M–$25M+
- Home era
- 1900s–1940s heritage mansions
- 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) | $131,000 – $290,000 |
| Moderate extension (multiple openings, roof extended) | $290,000 – $550,000 |
| Complex extension (structural steel portals, re-roofing) | $550,000 – $870,000 |
| Second-storey tie-in (existing house re-engineered) | $510,000 – $940,000 |
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. Bellevue Hill homes from the 1900s–1940s heritage mansions 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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Other Buildana services in Bellevue Hill
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Bellevue Hill 2023. Woollahra Municipal Council regulations and local controls are covered on each page.