Licensed Home Extension Builder Clontarf
NSW licensed extension specialist. Clontarf 2093 extensions on 1900s–1940s heritage + 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 300Clontarf Home Extensions & Additions
A home extension in Clontarf is built to the harbour-beach standard — Federation heritage and premium contemporary on 600 to 1,500m² blocks above Sandy Bay, where the addition claims the water properly or not at all.
The sandstone fall shapes the engineering, foreshore lines apply at the water, and the heritage stock extends behind its conserved character.
In the $4.5M to $12M+ harbour-front market, conservation-grade execution is the baseline.
We build these fixed-price, licence HBL 487805C. Walk us over the block and we will show you exactly what the position allows.
Buildana manages the complete home extension process in Clontarf — 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 Clontarf from $150K
- Northern Beaches Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Hawkesbury Sandstone — structural engineering included
- 1900s–1940s 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 via Mosman station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Claim the harbour with intent
Clontarf's positions above Sandy Bay reward additions that open to the water with intent — view levels, glazed living, terraces stepped down the fall — engineered on the sandstone.
The Federation stock extends behind its conserved character.
The standard stays the standard
At this market's level, marine-grade materials, exact detailing and heritage-literate design are the baseline, not an upgrade.
None of it is billed as an upgrade — it is in the fixed price from the outset.
Home extension 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 – $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 Clontarf home extension process: assess the existing structure, design the addition, approve, build. Fixed price throughout.
How It Works
From First Call to Final Key
Walk through your Clontarf home with our designer and structural engineer. We measure, photograph, and check the bones — footings, frame condition, roof structure.
⏱Our designer works with your existing home's layout — connecting new living areas to existing rooms, matching materials and roof pitch, and maximising natural light. You approve floor plans and 3D renders before we proceed.
⏱Most rear extensions in Clontarf qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through Northern Beaches Council because of overshadowing and privacy assessments.
⏱Extension built from new footings to completion — connecting structurally to your existing home. Class Hawkesbury Sandstone soil design managed.
⏱Walk through the completed extension, confirm finishes, collect your OC. Six-year structural warranty covers all new work including the junction with your existing home.
⏱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
We Build Across Sydney
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
Extend, Don't Move — Clontarf
Free design consultation for Clontarf 2093. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in Clontarf
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.