Home Extension Builder Carlton — Approved in 60 Days
Carlton 2218 extensions with tight approval timelines. CDC where eligible (~15 days), DA via Georges River Council in 40–60 days. Construction 12–24 weeks depending on scope.
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MBA NSW0476 300 300Quick Answer
A home extension in Carlton 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.
Home Extension Builder in Carlton
A home extension in Carlton more often goes up than out, because the blocks are the tight end of the St George market at 350 to 550m². The suburb's Federation and inter-war homes were built double-brick, and that original masonry will genuinely carry a first-floor addition. It is some of the best structure you can inherit. The 1960s to 1980s brick veneer scattered between them is a different proposition and needs steel before it takes load.
Knowing which house you own is the whole game, and it is not always obvious from the street. A first-floor addition on the right inter-war base adds two bedrooms and a bathroom without losing a metre of yard, which is valuable when yard is what Carlton lacks. With the station in walking distance and a $1.5M to $2.4M median, staying put stacks up.
What I would check first on your Carlton house: whether the walls are double brick or post-war veneer, since that single fact decides whether you go up cheaply or expensively.
We build these fixed-price, licence HBL 487805C. Book an inspection and we will read the walls for you.
Buildana manages the complete home extension process in Carlton — 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 Carlton 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 Carlton station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Tight blocks push you up
Carlton's blocks run 350 to 550m², the tight end of the St George market, so extensions here more often go up than out. When yard is the scarce thing, a first-floor addition adds two bedrooms and a bathroom without losing a metre of it.
The station in walking distance and a $1.5M to $2.4M median mean staying put and building stacks up against trading into a bigger house.
Read the walls before you design
The suburb's Federation and inter-war homes were built double-brick, and that masonry genuinely carries a first floor. Few things are better to inherit structurally.
The 1960s to 1980s brick veneer between them needs steel before it takes load, and it is not always obvious which you own from the street. That inspection is the whole budget conversation.
Home extension builder in Carlton — key facts
- Suburb
- Carlton, NSW 2218
- Council / LGA
- Georges River Council (Georges River Council)
- Primary zoning
- R2 Low Density
- 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 |
|---|---|
| Adding a master suite (1920s–1960s heritage Federation/Californian Bungalow + 1960s–1990s brick veneer + 2010s+ R3/R4 redevelopment around Hurstville/Kogarah/Beverly Hills CBDs Carlton home) | $120,000 – $270,000 |
| Kitchen/living open-out to backyard | $140,000 – $330,000 |
| Second storey for teenagers/office | $270,000 – $520,000 |
| Extension + bathroom (growing family) | $190,000 – $380,000 |
| Full rear + roof tie-in (entertainer's zone) | $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
Walk through your Carlton home with our designer and structural engineer. We measure, photograph, and check the bones — footings, frame condition, roof structure.
⏱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.
⏱Most rear extensions in Carlton qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through Georges River Council because of overshadowing and privacy assessments.
⏱Extension built from new footings to completion — connecting structurally to your existing home. Class M soil design managed.
⏱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.
⏱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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Last updated: 1 April 2026
Carlton Extension — Free Consultation
Free design consultation for Carlton 2218. We'll assess your home, design the extension, and provide a fixed-price quote.
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Other Buildana services in Carlton
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Carlton 2218. Georges River Council regulations and local controls are covered on each page.