Knockdown Rebuild Collaroy Plateau — From $450K All-In
Fixed-price knockdown rebuild in Collaroy Plateau 2097. Demolition, new home, all Northern Beaches Council approvals under one contract. No surprises, no variation trail.
HIA Member
MBA NSW0476 300 300Demolish and Rebuild in Collaroy Plateau
Ocean views are why people choose a knockdown rebuild on Collaroy Plateau, and rock is what they pay for the privilege. The 1950s to 1980s brick homes on the eastern fall sit over Hawkesbury Sandstone, with excavation typically running $40K to $100K depending on cut depth, a two-storey design that works with the slope instead of against it keeps that number honest. Blocks of 500 to 800m² give enough width to do it properly.
Long Reef Headland and the golf club sit below the plateau, and the quiet residential streets are exactly why owners here rebuild rather than relocate. Medians of $2.4M to $3.8M mean an end-of-life brick house is holding back serious land value. The right first move is a geotech report and a survey with real contours, not a display-home brochure.
What I would check first on a Collaroy Plateau block: the cut depth and rock cost, the eastern fall for views, and the design that works the slope. Those set the budget.
We build these fixed-price, licence HBL 487805C. We will organise both the geotech and the survey and give you a straight answer on cost.
Buildana manages the complete knockdown rebuild process in Collaroy Plateau — from site assessment and architectural design through to DA or CDC approval, demolition management, and fixed-price construction to handover. One builder, one contract, one new home.
Read our KDR Cost Guide 2026 or use the Renovation vs KDR Calculator to compare options.
- New home in Collaroy Plateau from $450K
- Northern Beaches Council DA and CDC approvals managed
- Demolition and asbestos removal included
- Hawkesbury Sandstone — engineered slab design included
- Typical blocks 500–800m² in Collaroy Plateau
- Single and two-storey designs available
- 6-year structural warranty
- Free site assessment — near B-Line bus to CBD (Collaroy interchange) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Views up top, rock underneath
Ocean views are why people rebuild on Collaroy Plateau, and rock is the price. The 1950s to 1980s brick homes on the eastern fall sit over Hawkesbury Sandstone, with excavation typically $40K to $100K depending on cut depth.
A two-storey design that works with the slope instead of against it keeps that number honest, and 500 to 800m² blocks give enough width to do it properly.
Rebuild rather than relocate
Long Reef Headland and the golf club sit below the plateau, and the quiet residential streets are exactly why owners rebuild rather than relocate. Medians of $2.4M to $3.8M mean an end-of-life brick house holds back serious land value.
The right first move is a geotech report and a survey with real contours, not a display-home brochure. We organise both and give a straight answer on cost.
Knockdown-rebuild builder in Collaroy Plateau — key facts
- Suburb
- Collaroy Plateau, NSW 2097
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 500–800m²
- Soil class
- Hawkesbury Sandstone
- Median house price
- $2.4M–$3.8M
- Home era
- 1950s–1980s + premium contemporary
- Typical price range
- $450,000 – $1,200,000+
- Typical timeline
- 14–22 months including demolition
- Approval pathway
- CDC where eligible or DA for complex sites
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
Collaroy Plateau KDR projects run on one contract: demolition, asbestos clearance, approvals, construction, handover. One builder accountable.
How It Works
From First Call to Final Key
Site visit covers everything that affects the build cost: vehicle access for trucks and crane, services (sewer depth, water connection, electrical service rating), soil exposure for borehole, neighbouring construction, and any obvious heritage or tree constraints. Real numbers, not estimates.
⏱Architectural design for your replacement home, structural engineering for Class Hawkesbury Sandstone soil, BASIX certification, and all approval documentation. Lodged as CDC (10–15 days) or DA (40–90 days) depending on design.
⏱Demolition runs 5–10 working days for a standard Collaroy Plateau cottage — longer if asbestos volume is significant or the structure includes a brick chimney or solid-block walls. Asbestos work happens first under a controlled removal program before mechanical demo starts.
⏱New home built from engineered slab (Class Hawkesbury Sandstone soil) to keys — fixed-price, milestone-based progress payments. Your project manager provides weekly updates.
⏱Walk through your finished home on your original Collaroy Plateau block. OC issued, all services live, 6-year structural warranty, appliance manuals, and maintenance schedule. Move in.
⏱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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Last updated: 1 April 2026
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Book a Collaroy Plateau Knockdown Rebuild Assessment
Free KDR site assessment for Collaroy Plateau 2097. We'll assess your block, estimate cost, and provide a fixed-price budget.
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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Collaroy Plateau 2097. Northern Beaches Council regulations and local controls are covered on each page.