Home Extension Gladesville — Design, Approval, Structural, Build
Full-service extensions in Gladesville 2111: structural survey of existing 1880s–1940s Federation/Victorian/inter-war heritage predominant (Heritage Conservation Areas cover virtually entire LGA) + premium contemporary infill home, design, Hunters Hill Council approval, engineering, weatherproofed construction, matched finish to original dwelling.
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MBA NSW0476 300 300Quick Answer
A home extension in Gladesville costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Hunters Hill Council approvals, and construction under one fixed-price contract.
Second-Storey & Rear Additions in Gladesville
A home extension in Gladesville often chases the water. The southern edge of the suburb falls hard toward the Parramatta River, and a first-floor addition on the Federation cottages and inter-war homes there can claim a river view that lifts the property well past the $2.2M to $4M median, with river-fall lots reaching $5M-plus. The 400 to 800m² blocks and mixed stock give most owners a real choice of direction.
Heritage is the filter. Conservation Areas are extensive over the village core along Victoria Road and the side streets, so those frontages get examined closely while rear and set-back upper work moves more freely. The ground is Wianamatta Shale with sandstone outcrops on the river fall, so lots down the slope need footings priced to the rock. Early double brick carries a storey, post-war stock favours going out.
What I would check first on your Gladesville house: the heritage overlay, whether a first floor would claim a river view, and the sandstone if you are on the southern fall. Those decide the design.
We build these fixed-price, licence HBL 487805C. Ask us what your street and your slope allow first.
Buildana manages the complete home extension process in Gladesville — 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 Gladesville from $150K
- Hunters Hill Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Hawkesbury Sandstone bedrock — structural engineering included
- 1880s–1940s Federation/Victorian/inter-war heritage predominant (Heritage Conservation Areas cover virtually entire LGA) + premium contemporary infill-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near West Ryde (3 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Chasing the river
The southern edge falls hard toward the Parramatta River, and a first-floor addition on the Federation and inter-war homes there can claim a view that lifts the property past the $2.2M to $4M median, with river-fall lots reaching $5M-plus.
The 400 to 800m² blocks and mixed stock leave most owners a genuine choice of direction.
Heritage and the fall
Conservation Areas are extensive over the village core along Victoria Road and the side streets, so those frontages get examined while rear and set-back upper work moves more freely.
The ground is Wianamatta Shale with sandstone outcrops down the river fall, so lots on the slope need footings priced to the rock. Early double brick takes a storey, while post-war stock leans toward going out.
Home extension builder in Gladesville — key facts
- Suburb
- Gladesville, NSW 2111
- Council / LGA
- Hunters Hill Council (Hunters Hill Council)
- Primary zoning
- R2 Low Density
- Typical lot size
- 500–1,200m² (premium Federation/Victorian/inter-war heritage predominant); 800–2,000m²+ harbour-front (Woolwich/Hunters Hill peninsula tip)
- Soil class
- Hawkesbury Sandstone bedrock
- Median house price
- $3.5M–$6.5M typical heritage; $5.0M–$15M+ harbour-front Woolwich/Hunters Hill peninsula
- Home era
- 1880s–1940s Federation/Victorian/inter-war heritage predominant
- 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) | $95,000 – $190,000 |
| Medium rear/side extension (30–60m²) | $190,000 – $340,000 |
| Large ground-floor extension (60–100m²) | $340,000 – $530,000 |
| Second-storey addition (60–120m²) | $290,000 – $580,000 |
| Wrap-around (ground + 1st floor) | $530,000+ |
| 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 Gladesville 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 Gladesville construction phase. Fixed price, programmed, supervised. Most rear extensions in Gladesville qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through Hunters Hill 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 Hawkesbury Sandstone bedrock 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
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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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