Home Extension Builder Cremorne — From $150K Fixed Price
Fixed-price home extensions in Cremorne 2090. Rear extension $150K–$300K, second storey $300K–$500K. North Sydney Council approvals managed. Free site consult.
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MBA NSW0476 300 300Quick Answer
A home extension in Cremorne costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, North Sydney Council approvals, and construction under one fixed-price contract.
Extending Homes in Cremorne
A home extension in Cremorne is a chance to grow one of the village's scarcer things — a detached house. Most of the area is apartments, so the Federation and mid-century homes on 350 to 600m² blocks are worth holding and improving rather than trading, and the HCA streets keep their frontages while the work goes behind.
On blocks this size the honest question is out or up, and I run both against your actual walls rather than assuming. The pre-war fabric gets licensed lead-and-asbestos treatment, and the sandstone ridge underneath is read wherever the structure changes.
At a $2.5M to $4.0M median, adding to the house beats trading out of the Military Road lifestyle — the cafes, the ferries, the walk to town are the whole reason to stay.
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 Cremorne — 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 Cremorne from $150K
- North Sydney Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1900s–1960s detached + apartments 1960s+-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near North Sydney (3 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The detached pockets grow
Cremorne's detached homes are the village's scarce commodity, and a wing grows them without trading away the lifestyle — designed to the metre, behind conserved frontages where the HCAs apply.
Whether it goes out or up is read honestly against your walls, not assumed.
Fabric and ground handled
On pre-war fabric, lead paint and asbestos are stripped under licence together, done properly rather than worked around.
The sandstone is read wherever the structure changes, and every part of it is priced into the job from the outset.
Home extension builder in Cremorne — key facts
- Suburb
- Cremorne, NSW 2090
- Council / LGA
- North Sydney Council (North Sydney)
- Primary zoning
- R3 Medium
- Typical lot size
- 350–600m²
- Soil class
- M
- Median house price
- $2.5M–$4.0M
- Home era
- 1900s–1960s detached + apartments 1960s+
- 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
We assess your Cremorne home — existing structure, block size (350–600m²), R3 Medium zoning, setbacks, FSR, and your space requirements. You'll know what's achievable before spending on detailed design.
⏱Design phase covers the extension layout, junction with existing structure, window and door placement, and external finish to match your Cremorne home's streetscape. Multiple design options presented.
⏱Documentation pack covers structural engineering for the new footings sized to match existing depths on Class M soil, BASIX 2025 compliance, shadow diagrams to neighbours' POS, hydraulic, and detailed sections through the wall-tie junction. Approval-grade, not concept-grade.
⏱Fixed-price construction of your extension. New footings engineered for Class M soil, structural connection to existing home, frame, fit-out, and finishes. Weekly updates from your project manager.
⏱Handover documentation covers the new work specifically — OC for the extension, structural certs, BASIX certificate updates, and warranty for the new section plus the junction detailing. Existing house remains under whatever warranty position applied before.
⏱Quality Promise
Buildana's Cremorne home extension process: assess the existing structure, design the addition, approve, build. Fixed price throughout.
Cost Guide
| Item | Estimated Range |
|---|---|
| Single-room addition (bedroom/study) | $77,000 – $180,000 |
| Kitchen/living extension | $190,000 – $450,000 |
| Master suite + ensuite addition | $170,000 – $360,000 |
| Second storey (full or partial) | $360,000 – $700,000 |
| Multi-room ground floor wrap | $450,000 – $770,000 |
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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