Home Extension Boronia Park — Design, Approval, Structural, Build
Full-service extensions in Boronia Park 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.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Boronia Park 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 Boronia Park
A home extension in Boronia Park grows the heritage family home — Federation and Victorian stock on 500 to 1,200m² blocks where the conservation areas cover the streets and the parkland setting stays.
The addition works behind the conserved frontage, the sandstone is read before the dig, and the pre-war fabric gets licensed handling.
At the $3.5M to $6.5M heritage median, the wing protects a Hunters Hill position rarely rebought.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with the heritage position checked, before you commit.
Buildana manages the complete home extension process in Boronia Park — 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 Boronia Park 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
Heritage and parkland
Boronia Park's conservation areas and parkland setting are the reason owners stay — and the addition works behind the conserved frontage, sympathetic to the peninsula's character.
The generous blocks give the wing genuine room.
Fabric and ground handled
The sandstone is read before the dig, and lead paint joins asbestos on the pre-war fabric — licensed processes both.
The rock read and the strip-out are both priced up front.
Home extension builder in Boronia Park — key facts
- Suburb
- Boronia Park, 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.
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 Boronia Park 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.
⏱Quality Promise
We extend Boronia Park homes with a structural engineer on every job. Second storey, rear addition, multi-room — engineered and priced upfront.
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.
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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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Boronia Park 2111. Hunters Hill Council regulations and local controls are covered on each page.