Licensed Home Extension Builder Bilgola Plateau
NSW licensed extension specialist. Bilgola Plateau 2107 extensions on 1960s–1990s + premium contemporary-era homes require structural sign-off, Class Hawkesbury Sandstone footings, and matched connection — we engineer and document properly.
HIA Member
MBA NSW0476 300 300Bilgola Plateau Home Extensions — Fixed Price
Here's the Bilgola Plateau equation: rock excavation runs $60K–$150K on these sandstone blocks, which can make digging out a ground-floor home extension dearer than building a first-floor addition — and the addition comes with ocean views off the eastern fall. That's why so much extension work on the Plateau goes up rather than out, even with 600–1,200m² of land to play with.
The 1960s–1990s brick homes generally carry a second storey once an engineer signs off the footings, though the pole houses scattered through the suburb are their own engineering conversation entirely. Lots backing Hudson Park Reserve carry BAL-19 to BAL-FZ ratings, so extension materials get specified to match. In a $2.6M–$5M market, an ocean-view level pays for itself. Request a feasibility check on your place.
Buildana manages the complete home extension process in Bilgola Plateau — 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 Bilgola Plateau from $150K
- Northern Beaches Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Hawkesbury Sandstone — structural engineering included
- 1960s–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 (Avalon interchange) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The equation favours up
When the sandstone makes digging dearer than building, the first-floor addition wins twice — it skips the rock bill and claims the ocean off the eastern fall.
In a $2.6M to $5M market, the view level pays for itself.
Engineering and BAL handled
The 1960s-1990s brick carries a second storey once the footings are verified — the pole houses are their own engineering conversation. Lots backing Hudson Park Reserve carry BAL-19 to flame zone, and every new external element is specified to match.
Both the second-storey engineering and the BAL materials sit in the fixed price up front.
Home extension builder in Bilgola Plateau — key facts
- Suburb
- Bilgola Plateau, NSW 2107
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 600–1,200m²
- Soil class
- Hawkesbury Sandstone
- Median house price
- $2.6M–$5M
- Home era
- 1960s–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.
Quality Promise
Buildana's Bilgola Plateau home extension process: assess the existing structure, design the addition, approve, build. Fixed price throughout.
How It Works
From First Call to Final Key
Free consultation at your Bilgola Plateau home. We inspect the existing structure, check Northern Beaches 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.
⏱CDC (10–15 business days) or DA through Northern Beaches 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 Bilgola Plateau.
⏱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.
⏱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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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 Bilgola Plateau 2107. Northern Beaches Council regulations and local controls are covered on each page.