Home Extension Artarmon — Design, Approval, Structural, Build
Full-service extensions in Artarmon 2064: structural survey of existing 1920s–1970s (Federation, inter-war, mid-century) home, design, Willoughby City Council approval, engineering, weatherproofed construction, matched finish to original dwelling.
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MBA NSW0476 300 300Quick Answer
A home extension in Artarmon costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Willoughby City Council approvals, and construction under one fixed-price contract.
Extending Homes in Artarmon
A home extension in Artarmon is precision work. The blocks are tight — 450 to 700m² under Federation and mid-century homes — so the wing is designed to the metre, using light and flow to do what raw floor area cannot. It is a suburb where good design earns its keep more than a big footprint would.
Two street types set the approach. Inside the Hampden Road and Cleland Road heritage conservation areas the frontage is kept and the wing works behind it; outside them the mixed stock extends more freely. Where the land falls into the valley pockets, the footing junction is engineered to travel with the house.
At a $2.6M to $3.6M median, a precise wing beats the cost of upsizing near the station — and the station walk is exactly what you keep by building rather than moving.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with the HCA position checked, before you commit.
Buildana manages the complete home extension process in Artarmon — 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 Artarmon from $150K
- Willoughby City Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1920s–1970s (Federation, inter-war, mid-century)-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Artarmon station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Precision on the grid
Artarmon's 450 to 700m² blocks reward design intelligence — a wing planned to the metre, with light and flow doing the work size cannot, and the station-side position holding every dollar of it.
Inside the HCAs the frontage stays and the wing works behind it.
Ground and fabric handled
Where the land falls into the valley pockets, the footing junction is engineered to move with the house.
The pre-war fabric has its lead and asbestos stripped under licence, and all of it is priced into the job from the outset.
Home extension builder in Artarmon — key facts
- Suburb
- Artarmon, NSW 2064
- Council / LGA
- Willoughby City Council (Willoughby)
- Primary zoning
- R2 Low Density
- Typical lot size
- 450–700m²
- Soil class
- M
- Median house price
- $2.6M–$3.6M
- Home era
- 1920s–1970s
- 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) | $108,000 – $220,000 |
| Medium rear/side extension (30–60m²) | $220,000 – $380,000 |
| Large ground-floor extension (60–100m²) | $380,000 – $600,000 |
| Second-storey addition (60–120m²) | $340,000 – $660,000 |
| Wrap-around (ground + 1st floor) | $600,000+ |
| 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. Walk through your Artarmon home with our designer and structural engineer. We measure, photograph, and check the bones — footings, frame condition, roof structure. The cost estimate that follows is grounded in what we found, not a generic per-m² number. Our designer works with your existing home's layout — connecting new living areas to existing rooms, matching materials and roof pitch, and maximising natural light. You approve floor plans and 3D renders before we proceed.
⏱The Artarmon construction phase. Fixed price, programmed, supervised. Most rear extensions in Artarmon qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through Willoughby City Council because of overshadowing and privacy assessments. We choose based on your design, not on what's easier to lodge. Extension built from new footings to completion — connecting structurally to your existing home. Class M soil design managed. Temporary weatherproofing maintains liveability where possible.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Walk through the completed extension, confirm finishes, collect your OC. Six-year structural warranty covers all new work including the junction with your existing home. Maintenance guide provided.
⏱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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