Home Extension Builder Davidson — From $150K Fixed Price
Fixed-price home extensions in Davidson 2085. Rear extension $150K–$300K, second storey $300K–$500K. Northern Beaches Council approvals managed. Free site consult.
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MBA NSW0476 300 300Quick Answer
A home extension in Davidson 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.
Davidson Home Extensions — Fixed Price
Every home extension in Davidson starts with three letters: BAL. Backing Garigal National Park, most lots here carry bushfire ratings from BAL-19 to flame zone, and that rating follows every new element of an extension — window systems, cladding, decks, subfloor detailing. It's not a reason to avoid extending; it's a specification to build to, and we build to it constantly across the Forest district.
Beyond the compliance, Davidson is generous extension country. The 1960s–1980s brick homes sit on 600–1,000m² blocks with real depth, so ground-floor rear extensions fit without crowding anything — though sandstone excavation at $50K–$130K on some lots deserves a test dig before you fix the budget. At $2.4M–$3.6M medians, adding space beats re-buying it. Get a BAL-literate quote before you start.
Buildana manages the complete home extension process in Davidson — 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 Davidson from $150K
- Northern Beaches Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Hawkesbury Sandstone — structural engineering included
- 1960s–1980s + 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
BAL is the first conversation
Backing Garigal National Park, most Davidson lots carry BAL-19 to flame zone — and the rating follows every new element: windows, cladding, decks, subfloor detailing.
It is a specification to build to, not a reason to avoid extending — and we build to it constantly across the Forest district.
Generous extension country
The 600 to 1,000m² blocks hold rear wings without crowding anything, though the sandstone deserves a test dig before the budget is fixed.
At the $2.4M to $3.6M median, adding space beats re-buying it. All priced upfront.
Home extension builder in Davidson — key facts
- Suburb
- Davidson, NSW 2085
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 600–1,000m²
- Soil class
- Hawkesbury Sandstone
- Median house price
- $2.4M–$3.6M
- Home era
- 1960s–1980s + 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.
How It Works
From First Call to Final Key
The first job on an extension is finding out what you're extending onto. Davidson homes from the 1960s–1980s + 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.
⏱Quality Promise
Every Buildana home extension in Davidson is delivered under a fixed-price contract — from design consultation through to defect-free handover.
Cost Guide
| Item | Estimated Range |
|---|---|
| Simple rear extension (single wall removal, no roof change) | $102,000 – $230,000 |
| Moderate extension (multiple openings, roof extended) | $230,000 – $430,000 |
| Complex extension (structural steel portals, re-roofing) | $430,000 – $680,000 |
| Second-storey tie-in (existing house re-engineered) | $400,000 – $730,000 |
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
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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
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Fatima Al-Rashid
Liverpool, NSW
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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 Davidson 2085. Northern Beaches Council regulations and local controls are covered on each page.