Licensed Home Extension Builder Leichhardt
NSW licensed extension specialist. Leichhardt 2040 extensions on 1880s–1920s + 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 Leichhardt costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Inner West Council approvals, and construction under one fixed-price contract.
Second-Storey & Rear Additions in Leichhardt
A home extension in Leichhardt means terraces, and terraces mean building backwards. The Victorian terraces and Federation cottages on 150 to 400m² blocks sit inside extensive Heritage Conservation Areas, so the Norton Street streetscape and the ornate frontages stay, and the work goes to the rear: opening a narrow floor plan into a light-filled kitchen and living wing.
Party walls both sides and tight or no side access set the construction method, with materials moving through the house or over the top. The ground is Wianamatta Shale with sandstone outcrops on the Hawthorne Canal fall, so terraces down the slope need careful underpinning before new load goes on. At a $1.9M to $3.2M median a walk from Norton Street, the space is worth the craft it takes.
What I would check first on your Leichhardt terrace: the party-wall and access situation, the heritage listing, and the sandstone if you are on the canal fall. Those decide how the whole thing runs.
We build these fixed-price, licence HBL 487805C. Ask us how we would sequence yours before anyone lifts a tool.
Buildana manages the complete home extension process in Leichhardt — 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 Leichhardt from $150K
- Inner West Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1880s–1920s + apartments-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Light Rail Leichhardt North (in suburb) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Terraces build backwards
The Victorian terraces and Federation cottages on 150 to 400m² blocks sit inside extensive Heritage Conservation Areas, so the ornate frontages and the Norton Street streetscape stay.
The work goes to the rear, opening a narrow floor plan into a light-filled kitchen and living wing.
A craft job
Party walls both sides and tight or no side access set the method, with materials moving through the house or over the top.
The Wianamatta Shale ground with sandstone on the Hawthorne Canal fall means terraces down the slope need underpinning before new load goes on. The result, a walk from Norton Street, is worth the craft.
Home extension builder in Leichhardt — key facts
- Suburb
- Leichhardt, NSW 2040
- Council / LGA
- Inner West Council (Inner West)
- Primary zoning
- R1/R2 General/Low
- Typical lot size
- 150–400m²
- Soil class
- M
- Median house price
- $1.9M–$3.2M
- Home era
- 1880s–1920s + 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.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Walk through your Leichhardt 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 Leichhardt construction phase. Fixed price, programmed, supervised. Most rear extensions in Leichhardt qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through Inner West 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.
⏱Quality Promise
Buildana's Leichhardt home extension process: assess the existing structure, design the addition, approve, build. Fixed price throughout.
Cost Guide
| Item | Estimated Range |
|---|---|
| Small rear extension (up to 30m²) | $99,000 – $200,000 |
| Medium rear/side extension (30–60m²) | $200,000 – $350,000 |
| Large ground-floor extension (60–100m²) | $350,000 – $550,000 |
| Second-storey addition (60–120m²) | $310,000 – $610,000 |
| Wrap-around (ground + 1st floor) | $550,000+ |
| 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
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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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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Leichhardt 2040. Inner West Council regulations and local controls are covered on each page.