Licensed Granny Flat Specialist Clontarf
NSW licensed builder delivering SEPP-compliant granny flats across Clontarf 2093. BASIX, engineered slab (Class Hawkesbury Sandstone), full certifier sign-off and 6-year structural warranty.
HIA Member
MBA NSW0476 300 300Clontarf Granny Flat Construction — Fixed Price
A granny flat builder in Clontarf works with a premium harbour peninsula where a secondary dwelling is about family or high-end rental, not budget yield. The Federation and contemporary stock sits on 600 to 1,500m² blocks, so clearing the 450m² threshold for a 60m² secondary dwelling under the Housing SEPP is never the issue. The real cost drivers here are the sandstone rock and the heritage.
The Hawkesbury Sandstone brings deep rock excavation, typically $60K to $150K, which on a small granny flat footprint is a proportionally large line. Heritage Conservation Areas cover the older streets, and direct waterfront carries a Foreshore Building Line. Where the older home has fibro, a licensed asbestos strip-out comes first if demolition is involved.
What I check first on your Clontarf block: the depth to rock, whether you sit inside a Heritage Conservation Area or behind the Foreshore Building Line, and the Middle Harbour fall. Those decide the build and the price.
We build fixed-price, licence HBL 487805C. Get our granny flat feasibility before you commit.
Buildana manages the full granny flat process in Clontarf — from site assessment and CDC fast-track approval through to fixed-price construction and handover. We build studio, 1-bedroom, and 2-bedroom designs up to the NSW maximum of 60m².
Read our Complete Granny Flat Guide or explore granny flat builds across Sydney.
- Granny flats in Clontarf from $150K
- CDC fast-track approval (10–15 business days)
- 600–1,500m² blocks — most qualify for 60m² granny flat
- Clontarf zoned R2 Low / R3 Medium (Manly, Dee Why, Brookvale, Mona Vale, Avalon town centres) / RU2 Rural Landscape (Ingleside, Terrey Hills, Duffys Forest, Oxford Falls) / E3/E4 Environmental on bushland fringe
- Fixed-price contract — design to handover
- Hawkesbury Sandstone — engineered slab included
- Rental yield $620–$900/week (beach proximity + Northern Beaches Hospital staff demand drives premium) in Clontarf
- Free site assessment — near B-Line bus to CBD via Mosman station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Land is not the constraint, rock and heritage are
Clontarf's 600 to 1,500m² blocks clear the 450m² Housing SEPP threshold many times over, so land size never stops a granny flat here. What shapes the build is the sandstone and the heritage. Deep rock excavation runs $60K to $150K, and on a 60m² secondary dwelling that rock is proportionally a big line because the dwelling itself is small. I would rather price it from a real geotech than have it found by the excavator.
Heritage Conservation Areas cover the older streets, and direct waterfront carries a Foreshore Building Line, so both shape where and what you can build. I map them on your exact block first.
A premium secondary dwelling
On a harbour peninsula like this, a granny flat is usually about extended family living or a high-end rental rather than budget yield. The value is in building it to a standard that matches the setting and the main house, and positioning it to take the Middle Harbour outlook where the block allows. A well-built secondary dwelling here holds real value, and I design it to suit whether you want family living or a premium tenant.
Granny flat builder in Clontarf — key facts
- Suburb
- Clontarf, NSW 2093
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 600–1,500m²
- Soil class
- Hawkesbury Sandstone
- Median house price
- $4.5M–$12M+ (harbour-front)
- Home era
- 1900s–1940s heritage + premium contemporary
- Typical price range
- $150,000 – $300,000+
- Typical timeline
- 4–6 months design to handover
- Approval pathway
- CDC via NSW Affordable Rental Housing SEPP (10–15 days)
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 Clontarf granny flats: designed for your block, built to CDC standards, delivered under a fixed-price contract.
How It Works
From First Call to Final Key
Free on-site assessment of your Clontarf property. We measure setbacks, check existing services, assess access, and confirm your 600–1,500m² block meets Northern Beaches Council's requirements for a secondary dwelling.
⏱60m² sounds tight on paper but designs well — high ceilings, good cross-ventilation, smart storage, and proper bedroom proportions make a 2-bed feel generous. We design for daily liveability, not just floor plan compliance.
⏱CDC fast-track through a private certifier — typically approved in 10–15 business days. Clontarf is zoned R2 Low. Construction Certificate issued before works start.
⏱Your granny flat is built from slab to keys in a single programme. Engineered slab for Class Hawkesbury Sandstone soil, frame, lock-up, fit-out, painting, flooring, and external works. Quality inspections at every stage.
⏱Defect-free inspection means we don't hand over a list to chase — every snag is fixed before keys move. Final clean, electrical and plumbing tested, smoke alarms certified, BASIX commissioning verified. The unit is rental-ready, not project-paperwork-ready.
⏱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 July 2025
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Other Buildana services in Clontarf
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Clontarf 2093. Northern Beaches Council regulations and local controls are covered on each page.