Home Extension Builder Narrabeen — Approved in 60 Days
Narrabeen 2101 extensions with tight approval timelines. CDC where eligible (~15 days), DA via Northern Beaches Council in 40–60 days. Construction 12–24 weeks depending on scope.
HIA Member
MBA NSW0476 300 300Narrabeen Home Extensions — Fixed Price
Between the lagoon and the beach, Narrabeen's ground does more of the talking than most owners realise. Lagoon-edge lots carry coastal acid sulphate soils that complicate excavation for any ground-floor home extension. Disturb that ground without a management plan and you have bought yourself a remediation problem. Direct beachfront sits in the coastal hazard zone with its own engineering rules. The land between extends far more simply.
Which is partly why so much Narrabeen extension work goes up instead. A first-floor addition on the 1920s to 1960s beach houses lifts living space toward ocean or lagoon views without touching the sensitive ground, and the older double-brick stock carries it well. Heritage Conservation Areas over the older streets watch the front elevation. The rear and the roofline are your working space.
What I would check first on your Narrabeen block: whether you are lagoon-edge, beachfront, or the easier land between, plus the heritage overlay on the front. Those decide up or out.
We build these fixed-price, licence HBL 487805C. Ask us to read your lot before you sketch.
Buildana manages the complete home extension process in Narrabeen — 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 Narrabeen from $150K
- Northern Beaches Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Hawkesbury Sandstone — structural engineering included
- 1920s–1960s heritage + 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 (Narrabeen interchange) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The ground decides
Lagoon-edge lots carry acid sulphate soils that complicate any ground-floor dig. Disturb that ground without a management plan and you have a remediation problem. Direct beachfront sits in the coastal hazard zone with its own rules.
The land between those two extremes extends far more simply, which is the first thing we establish about your block.
Why the work goes up
A first-floor addition on the 1920s to 1960s beach houses lifts living space toward the ocean or lagoon views without disturbing the sensitive ground, and the older double-brick stock carries it well.
Heritage Conservation Areas over the older streets watch the front elevation, so the rear and the roofline are your working space.
Home extension builder in Narrabeen — key facts
- Suburb
- Narrabeen, NSW 2101
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 450–800m²
- Soil class
- Hawkesbury Sandstone
- Median house price
- $2.6M–$5.5M+ (oceanfront)
- Home era
- 1920s–1960s heritage + 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
Our Narrabeen home extensions connect old-to-new cleanly. Matched brickwork, tied roofline, no awkward transitions.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Extension feasibility comes down to two things: what the existing structure can carry, and what Northern Beaches Council will let you build. We assess both at the consultation — no point designing for a second storey if the slab can't take the load. Extension designed to integrate with your existing Narrabeen home — matching roof lines, materials, and flow between old and new sections. Floor plans, elevations, and 3D renders.
⏱The Narrabeen construction phase. Fixed price, programmed, supervised. All approval documentation prepared: structural drawings, BASIX, shadow analysis, stormwater, and statement of environmental effects (if DA). Lodged and managed through to Construction Certificate. Extension construction takes 3–6 months on average. Footings excavated and poured to match existing depth on Class Hawkesbury Sandstone soil, frame stand, roof tie-in (most weather-critical phase), lock-up, then internal fit-out at the same standard as the existing house.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Defect-free inspection, OC issued, 6-year warranty on all new work. Junction between old and new sections waterproofed and warranted. Maintenance guide covers care of new and existing areas.
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
Estimate Your Build Cost
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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
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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Other Buildana services in Narrabeen
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Narrabeen 2101. Northern Beaches Council regulations and local controls are covered on each page.