Kogarah Home Extension Builder — Live In, Build On
Buildana extends homes across Kogarah 2217 while you stay in place. 1920s–1960s heritage Federation/Californian Bungalow + 1960s–1990s brick veneer + 2010s+ R3/R4 redevelopment around Hurstville/Kogarah/Beverly Hills CBDs-era structure, Georges River Council rules, weatherproofing during build — all managed locally from Fairfield.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Kogarah costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Georges River Council approvals, and construction under one fixed-price contract.
Kogarah Home Extensions — Fixed Price
A home extension in Kogarah is shaped by the St George hospital precinct on its doorstep. That medical engine gives owners two honest paths — a family wing on the Federation side streets, or a robust lettable addition feeding the permanent staff-and-student demand — and I scope to whichever you are actually building for.
Around the CBD the R3 and R4 carry redevelopment value, so I check the zoning before a big spend, and the pre-war fabric gets licensed handling where we open it.
At a $1.5M to $2.4M median the addition beats the friction of upsizing beside the hospitals.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with the zoning checked, before you commit.
Buildana manages the complete home extension process in Kogarah — 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 Kogarah from $150K
- Georges River Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1920s–1960s heritage Federation/Californian Bungalow + 1960s–1990s brick veneer + 2010s+ R3/R4 redevelopment around Hurstville/Kogarah/Beverly Hills CBDs-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Kogarah station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The precinct sets the brief
The medical precinct keeps demand permanent, which is why the brief matters: a family wing on the character side streets, or a robust lettable addition into the staff-and-student market.
I ask what you are building for in the first conversation and scope to that, not to a template.
Zoning and fabric handled
Around the CBD the R3 and R4 get weighed before a big spend, so the money is not stranded under land worth more redeveloped.
Lead paint comes out with the asbestos on the pre-war fabric, both under licence and priced up front.
Home extension builder in Kogarah — key facts
- Suburb
- Kogarah, NSW 2217
- Council / LGA
- Georges River Council (Georges River Council)
- Primary zoning
- R2
- Typical lot size
- 400–700m² typical (Hurstville/Kogarah/Beverly Hills/Penshurst/Mortdale/Carlton/Kingsgrove/Allawah); 600–1,200m² premium foreshore (Oatley/Lugarno/Peakhurst Heights/Connells Point)
- Soil class
- M
- Median house price
- $1.5M–$2.4M typical; $2.0M–$3.5M Oatley/Lugarno/Peakhurst Heights premium foreshore; $3.0M–$8.0M+ direct waterfront
- Home era
- 1920s–1960s heritage Federation/Californian Bungalow + 1960s–1990s brick veneer + 2010s+ R3/R4 redevelopment around Hurstville/Kogarah/Beverly Hills CBDs
- 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) | $57,000 – $130,000 |
| Kitchen/living extension | $140,000 – $330,000 |
| Master suite + ensuite addition | $120,000 – $270,000 |
| Second storey (full or partial) | $270,000 – $520,000 |
| Multi-room ground floor wrap | $330,000 – $570,000 |
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 Georges River 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 Kogarah 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 M 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
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
Extend Your Home in Kogarah
Free design consultation for Kogarah 2217. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in Kogarah
Other Buildana services in Kogarah
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Kogarah 2217. Georges River Council regulations and local controls are covered on each page.