Home Extension Clifton Gardens — Design, Approval, Structural, Build
Full-service extensions in Clifton Gardens 2088: structural survey of existing 1900s–1940s heritage home, design, Mosman Council approval, engineering, weatherproofed construction, matched finish to original dwelling.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Clifton Gardens costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Mosman Council approvals, and construction under one fixed-price contract.
Home Extension Builder in Clifton Gardens
A home extension in Clifton Gardens is conservation-grade work from start to finish. The heritage areas cover very nearly every street in this small enclave, so the wing that gets approved is one that disappears behind the protected fabric while opening the living toward Chowder Bay — seen from the street, almost nothing changes.
At a $5.0M to $15M median, exactness is the only standard the market accepts. The substantial fall on these lots is engineered, the deep sandstone rock is priced from the geotech rather than guessed, and the pre-war fabric is handled under licence throughout.
It is an enclave where the scrutiny is intense and the values are enormous, so everything is resolved and costed before you commit — heritage, rock and fall alike.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with heritage, rock and fall resolved, before you commit.
Buildana manages the complete home extension process in Clifton Gardens — 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 Clifton Gardens from $150K
- Mosman Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1900s–1940s heritage-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near North Sydney (5 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Conservation-grade, or nothing
Clifton Gardens' enclave standing demands the wing be conservation-grade — invisible behind the protected fabric, opening the living to the bay with the exactness the HCA scrutiny enforces.
At these values, precision is precisely what the market pays for.
Fall, rock and fabric
The substantial fall and the deep rock typical of the lots are engineered and priced from the geotech.
The pre-war hazards run as licensed processes, and all of it sits in the scope from the outset.
Home extension builder in Clifton Gardens — key facts
- Suburb
- Clifton Gardens, NSW 2088
- Council / LGA
- Mosman Council (Mosman)
- Primary zoning
- R2 Low Density
- Typical lot size
- 600–1,500m²
- Soil class
- M
- Median house price
- $5.0M–$15M
- Home era
- 1900s–1940s heritage
- 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
Everything that has to be right before we touch the ground. Free consultation at your Clifton Gardens home. We inspect the existing structure, check Mosman Council's controls, measure available space, and discuss what you need. You get a clear scope, budget range, and timeline before committing. Two design moves are usually on the table: match the existing house so the extension reads as original, or contrast with it so the new section is clearly modern. Both work — choice is aesthetic, and we'll show 3D renders of both before you commit.
⏱The Clifton Gardens construction phase. Fixed price, programmed, supervised. CDC (10–15 business days) or DA through Mosman Council depending on scope. Structural engineering, BASIX, and all documentation prepared and lodged. Construction Certificate obtained. Construction phase connects new to existing — footings, frame, roof tie-in, waterproofing at junction, internal fit-out and external finish. Staged works minimise disruption to your daily routine in Clifton Gardens.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Final inspection focuses on the integration: paint blend, flooring transitions, ceiling height, junction waterproofing, sound transmission. The extension shouldn't feel bolted on — it should feel like the house was always meant to be this size.
⏱Quality Promise
Buildana's Clifton Gardens home extension process: assess the existing structure, design the addition, approve, build. Fixed price throughout.
Cost Guide
| Item | Estimated Range |
|---|---|
| Small rear extension (up to 30m²) | $131,000 – $260,000 |
| Medium rear/side extension (30–60m²) | $260,000 – $460,000 |
| Large ground-floor extension (60–100m²) | $460,000 – $730,000 |
| Second-storey addition (60–120m²) | $410,000 – $800,000 |
| Wrap-around (ground + 1st floor) | $730,000+ |
| Structural engineering & tie-in | Included |
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
Extend Your Home in Clifton Gardens
Free design consultation for Clifton Gardens 2088. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in Clifton Gardens
Other Buildana services in Clifton Gardens
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Clifton Gardens 2088. Mosman Council regulations and local controls are covered on each page.