Home Extension Frenchs Forest — Design, Approval, Structural, Build
Full-service extensions in Frenchs Forest 2086: structural survey of existing 1960s–1980s home, design, Northern Beaches Council approval, engineering, weatherproofed construction, matched finish to original dwelling.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Frenchs Forest 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.
Second-Storey & Rear Additions in Frenchs Forest
A home extension in Frenchs Forest rides the hospital precinct's repricing — 1960s-1980s homes on 600 to 900m² blocks in a suburb the Northern Beaches Hospital and its town-centre plans keep lifting.
The precinct's planned renewal gets the zoning check on nearby blocks, BAL ratings apply against the reserves, and the era fabric gets licensed handling.
At the $2.2M to $3.4M median, the wing beats trading up in a corridor still moving.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with the precinct read, before you commit.
Buildana manages the complete home extension process in Frenchs Forest — 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 Frenchs Forest from $150K
- Northern Beaches Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Hawkesbury Sandstone — structural engineering included
- 1960s–1980s-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 (Forest Way interchange) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The precinct keeps lifting
The hospital and its town-centre plans keep repricing Frenchs Forest — and the extended home rides that lift while the original compact plans lag behind it.
Blocks near the planned renewal get the zoning read before any big wing.
Forest conditions handled
BAL ratings apply against the reserves, the sandstone is read before the dig, and the era fabric gets licensed handling.
All of it is read and costed before the budget is locked.
Home extension builder in Frenchs Forest — key facts
- Suburb
- Frenchs Forest, NSW 2086
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 600–900m²
- Soil class
- Hawkesbury Sandstone
- Median house price
- $2.2M–$3.4M
- Home era
- 1960s–1980s
- 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
Free consultation at your Frenchs Forest home. We inspect the existing structure, check Northern Beaches Council's controls, measure available space, and discuss what you need.
⏱Two design moves are usually on the table: match the existing house so the extension reads as original, or contrast with it so the new section is clearly modern. Both work — choice is aesthetic, and we'll show 3D renders of both before you commit.
⏱CDC (10–15 business days) or DA through Northern Beaches Council depending on scope. Structural engineering, BASIX, and all documentation prepared and lodged.
⏱Construction phase connects new to existing — footings, frame, roof tie-in, waterproofing at junction, internal fit-out and external finish. Staged works minimise disruption to your daily routine in Frenchs Forest.
⏱Final inspection focuses on the integration: paint blend, flooring transitions, ceiling height, junction waterproofing, sound transmission. The extension shouldn't feel bolted on — it should feel like the house was always meant to be this size.
⏱Quality Promise
Frenchs Forest home extension specialists: we work on your home while you live in it, weatherproof the site nightly, finish clean.
Cost Guide
| Item | Estimated Range |
|---|---|
| Adding a master suite (1960s–1980s Frenchs Forest home) | $150,000 – $310,000 |
| Kitchen/living open-out to backyard | $170,000 – $390,000 |
| Second storey for teenagers/office | $310,000 – $620,000 |
| Extension + bathroom (growing family) | $220,000 – $450,000 |
| Full rear + roof tie-in (entertainer's zone) | $390,000 – $670,000 |
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
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Fatima Al-Rashid
Liverpool, NSW
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Last updated: 1 April 2026
Frenchs Forest Extension — Free Consultation
Free design consultation for Frenchs Forest 2086. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in Frenchs Forest
Other Buildana services in Frenchs Forest
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Frenchs Forest 2086. Northern Beaches Council regulations and local controls are covered on each page.