Home Extension Builder Belrose — From $150K Fixed Price
Fixed-price home extensions in Belrose 2085. Rear extension $150K–$300K, second storey $300K–$500K. Northern Beaches Council approvals managed. Free site consult.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Belrose costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Northern Beaches Council approvals, and construction under one fixed-price contract.
Home Extension Builder in Belrose
A home extension in Belrose uses the Forest district's room — 1970s-1990s homes on 600 to 1,200m² blocks where the rear wing fits without crowding and the premium contemporary infill sets the standard.
BAL ratings lead on the reserve-backing lots, the sandstone is read before the dig, and the junctions are engineered where new meets old.
At the $2.4M to $3.8M median, the wing beats surrendering a Forest block to move.
We build these fixed-price, licence HBL 487805C. Ask us to measure what your block can hold.
Buildana manages the complete home extension process in Belrose — 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 Belrose from $150K
- Northern Beaches Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Hawkesbury Sandstone — structural engineering included
- 1970s–1990s + premium contemporary-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near B-Line bus to CBD (Frenchs Forest interchange) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Forest room, used properly
Belrose's blocks hold what most suburbs cannot — full family wings, parents' suites, entertaining domains — with the 1970s-1990s brick taking the additions confidently once engineered.
The contemporary infill around you sets a finish bar worth meeting.
Bush and rock handled
BAL ratings shape the reserve-backing lots' materials, and the sandstone deserves a test dig before the budget is fixed.
The BAL materials and the rock read are both in the fixed price up front.
Home extension builder in Belrose — key facts
- Suburb
- Belrose, NSW 2085
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 600–1,200m²
- Soil class
- Hawkesbury Sandstone
- Median house price
- $2.4M–$3.8M
- Home era
- 1970s–1990s + premium contemporary
- 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 |
|---|---|
| Simple rear extension (single wall removal, no roof change) | $103,000 – $230,000 |
| Moderate extension (multiple openings, roof extended) | $230,000 – $440,000 |
| Complex extension (structural steel portals, re-roofing) | $440,000 – $690,000 |
| Second-storey tie-in (existing house re-engineered) | $400,000 – $750,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
The first job on an extension is finding out what you're extending onto. Belrose homes from the 1970s–1990s + premium contemporary were built to different standards — we open walls, check footings, verify load paths. The existing house has to carry the new work.
⏱Design follows the existing roof. A bad extension looks like a bolt-on; a good one reads as original. Matched brickwork or contrasting render (whichever the architecture calls for), tied-in roofline, continuous flooring where it should be continuous.
⏱Construction happens while you live in the house. That means weatherproofing every night, staging the works so kitchens and bathrooms don't disappear on the same week, and keeping the site clean of debris that doesn't belong in a family home.
⏱Finish is seamless. Paint match, floor match, roofline match, brick match where possible. The only way to tell the extension is new is the date on the plans.
⏱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 Belrose 2085. Northern Beaches Council regulations and local controls are covered on each page.