Home Extension Builder Warriewood — From $150K Fixed Price
Fixed-price home extensions in Warriewood 2102. Rear extension $150K–$300K, second storey $300K–$500K. Northern Beaches Council approvals managed. Free site consult.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Warriewood costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Northern Beaches Council approvals, and construction under one fixed-price contract.
Warriewood Home Extensions & Additions
A home extension in Warriewood reads the estate against the original — the 2010s master-planned homes mostly get the honest not-yet, while the older beach-side and valley stock takes wings confidently.
The valley's drainage lows get the levels check, salt-aware materials apply near the sand, and estate guidelines are reviewed where they still bind.
At the $2.4M to $5M+ market, the right addition beats the friction of trading up the peninsula.
We build these fixed-price, licence HBL 487805C. Tell me what you own and I will give you a straight read.
Buildana manages the complete home extension process in Warriewood — 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 Warriewood 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 + 2010s+ master-planned + 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 (Mona Vale interchange) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Two Warriewoods, two answers
The master-planned estates are young and mostly do not need the wing yet — I say so. The original beach-side and valley homes take additions confidently on the standard era logic.
The honest read comes before any design spend.
Valley and coast conditions
The valley lows get the drainage and levels check, salt-aware materials apply near the sand, and estate guidelines are reviewed where they bind.
All of it is costed up front, before any design money is spent.
Home extension builder in Warriewood — key facts
- Suburb
- Warriewood, NSW 2102
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 300–800m² (master-planned + original)
- Soil class
- Hawkesbury Sandstone
- Median house price
- $2.4M–$5M+ (oceanfront)
- Home era
- 1920s–1960s heritage + 2010s+ master-planned + 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.
How It Works
From First Call to Final Key
We assess your Warriewood home — existing structure, block size (300–800m² (master-planned + original)), R2 Low zoning, setbacks, FSR, and your space requirements. You'll know what's achievable before spending on detailed design.
⏱Design phase covers the extension layout, junction with existing structure, window and door placement, and external finish to match your Warriewood home's streetscape. Multiple design options presented.
⏱Documentation pack covers structural engineering for the new footings sized to match existing depths on Class Hawkesbury Sandstone soil, BASIX 2025 compliance, shadow diagrams to neighbours' POS, hydraulic, and detailed sections through the wall-tie junction. Approval-grade, not concept-grade.
⏱Fixed-price construction of your extension. New footings engineered for Class Hawkesbury Sandstone soil, structural connection to existing home, frame, fit-out, and finishes. Weekly updates from your project manager.
⏱Handover documentation covers the new work specifically — OC for the extension, structural certs, BASIX certificate updates, and warranty for the new section plus the junction detailing. Existing house remains under whatever warranty position applied before.
⏱Quality Promise
Buildana's Warriewood home extension process: assess the existing structure, design the addition, approve, build. Fixed price throughout.
Cost Guide
| Item | Estimated Range |
|---|---|
| Single-room addition (bedroom/study) | $68,000 – $160,000 |
| Kitchen/living extension | $170,000 – $400,000 |
| Master suite + ensuite addition | $150,000 – $320,000 |
| Second storey (full or partial) | $320,000 – $620,000 |
| Multi-room ground floor wrap | $400,000 – $680,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
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 Your Home in Warriewood
Free design consultation for Warriewood 2102. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in Warriewood
Other Buildana services in Warriewood
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Warriewood 2102. Northern Beaches Council regulations and local controls are covered on each page.