Home Extension Builder Henley — From $150K Fixed Price
Fixed-price home extensions in Henley 2111. Rear extension $150K–$300K, second storey $300K–$500K. Hunters Hill Council approvals managed. Free site consult.
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MBA NSW0476 300 300Quick Answer
A home extension in Henley 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.
Henley Home Extensions & Additions
A home extension in Henley works with the Parramatta River, not against it. This small Hunters Hill foreshore suburb runs Federation and inter-war heritage homes on 500 to 1,200m² blocks with substantial fall to the water, so an addition here rarely means a flat rear slab. It steps down the slope, hangs off engineered piers, or reaches for a river view a level up. The premium these foreshore homes carry justifies doing it properly.
Heritage sets the frame. Conservation Areas cover most streets, so street-facing changes get examined closely while rear and set-back upper work moves more freely. The ground is sandstone-dominant with deep rock excavation typical, so we test before pricing groundwork rather than guessing. Waterfront lots also carry Foreshore Building Line limits that cap how far a structure can push toward the river.
What I would check first on your Henley block: the heritage status, the river fall and how the addition sits on it, and the sandstone in the dig. Those decide the design and the budget.
We build these fixed-price, licence HBL 487805C. Show us your slope and we will design to it.
Buildana manages the complete home extension process in Henley — 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 Henley 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 Wollstonecraft (5 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Working with the river
This small Hunters Hill foreshore suburb runs Federation and inter-war heritage homes on 500 to 1,200m² blocks with substantial fall to the water, so an addition rarely means a flat rear slab.
It steps down the slope, hangs off engineered piers, or reaches for a river view a level up, and the premium these foreshore homes carry justifies doing it properly.
Heritage, rock and foreshore limits
Conservation Areas cover most streets, so street-facing changes get examined while rear and set-back upper work moves more freely, and the sandstone-dominant ground means we test before pricing groundwork.
Waterfront lots also carry Foreshore Building Line limits that cap how far a structure can push toward the river, which we design around from the start.
Home extension builder in Henley — key facts
- Suburb
- Henley, NSW 2111
- Council / LGA
- Hunters Hill Council (Hunters Hill Council)
- Primary zoning
- R2 Low Density
- Typical lot size
- 500–1,200m²
- 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 |
|---|---|
| Single-room addition (bedroom/study) | $60,000 – $140,000 |
| Kitchen/living extension | $150,000 – $350,000 |
| Master suite + ensuite addition | $130,000 – $280,000 |
| Second storey (full or partial) | $280,000 – $550,000 |
| Multi-room ground floor wrap | $350,000 – $600,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
Extension feasibility comes down to two things: what the existing structure can carry, and what Hunters Hill Council will let you build. We assess both at the consultation — no point designing for a second storey if the slab can't take the load.
⏱Extension designed to integrate with your existing Henley home — matching roof lines, materials, and flow between old and new sections. Floor plans, elevations, and 3D renders.
⏱All approval documentation prepared: structural drawings, BASIX, shadow analysis, stormwater, and statement of environmental effects (if DA). Lodged and managed through to Construction Certificate.
⏱Extension construction takes 3–6 months on average. Footings excavated and poured to match existing depth on Class Hawkesbury Sandstone bedrock soil, frame stand, roof tie-in (most weather-critical phase), lock-up, then internal fit-out at the same standard as the existing house.
⏱Defect-free inspection, OC issued, 6-year warranty on all new work. Junction between old and new sections waterproofed and warranted. Maintenance guide covers care of new and existing areas.
⏱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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