Knockdown Rebuild Duffys Forest — From $450K All-In
Fixed-price knockdown rebuild in Duffys Forest 2084. Demolition, new home, all Northern Beaches Council approvals under one contract. No surprises, no variation trail.
HIA Member
MBA NSW0476 300 300Duffys Forest Knockdown Rebuilds
A knockdown rebuild in Duffys Forest is a premium acreage project — RU2 holdings of one to ten-plus hectares with bushland and pastoral character. A rebuild delivers a substantial rural homestead on serious land, with the full acreage stack applying.
BAL-29 to Flame Zone is universal here, so the RFS Bushfire Protection Assessment is mandatory and drives the whole design. The sandstone means deep rock excavation of $80,000 to $200,000-plus, priced from a geotech bore. AWTS on-site sewer is mandatory (no reticulated sewer), and the Drinking Water Catchment overlay touches the western edge.
The older rural homes can carry asbestos, so a licensed strip-out leads the demolition.
We rebuild fixed-price, licence HBL 487805C. Get our acreage feasibility, with the full stack costed, before you commit.
Buildana manages the complete knockdown rebuild process in Duffys Forest — from site assessment and architectural design through to DA or CDC approval, demolition management, and fixed-price construction to handover. One builder, one contract, one new home.
Read our KDR Cost Guide 2026 or use the Renovation vs KDR Calculator to compare options.
- New home in Duffys Forest from $450K
- Northern Beaches Council DA and CDC approvals managed
- Demolition and asbestos removal included
- Hawkesbury Sandstone — engineered slab design included
- Typical blocks 1–10ha+ acreage (RU2) in Duffys Forest
- Single and two-storey designs available
- 6-year structural warranty
- Free site assessment — near Bus to Mona Vale (8 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Acreage with a serious stack
Duffys Forest's one to ten-plus hectare RU2 holdings carry bushland and pastoral character — and a serious build stack. BAL-29 to Flame Zone is universal, so the RFS assessment is mandatory and drives the design: materials, glazing, screening, siting.
A rebuild here delivers a substantial rural homestead, planned as acreage from the start.
Deep rock, AWTS and catchment
The sandstone means deep rock excavation of $80,000 to $200,000-plus, priced from a real geotech bore. AWTS on-site sewer is mandatory — there is no reticulated sewer — and the Drinking Water Catchment overlay touches the western edge.
All of it is in the feasibility and the fixed price before we start.
Knockdown-rebuild builder in Duffys Forest — key facts
- Suburb
- Duffys Forest, NSW 2084
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 1–10ha+ acreage (RU2)
- Soil class
- Hawkesbury Sandstone
- Median house price
- $3.5M–$8M+ acreage
- Home era
- 1970s–1990s rural + premium contemporary homesteads
- Typical price range
- $450,000 – $1,200,000+
- Typical timeline
- 14–22 months including demolition
- Approval pathway
- CDC where eligible or DA for complex sites
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
Every Buildana knockdown rebuild in Duffys Forest is delivered under a fixed-price contract — site assessment through to defect-free handover.
How It Works
From First Call to Final Key
KDR starts with an honest look at the existing house. Sometimes it's worth keeping. Most Duffys Forest homes from the 1970s–1990s rural + premium contemporary homesteads — especially fibro and brick-veneer — are beyond the point where renovation makes sense. We tell you straight.
⏱Demolition is pre-approved to run parallel with rebuild design. Asbestos cleared, services abolished, site stripped in a single mobilisation. Geotech reconfirms Class Hawkesbury Sandstone soil with the old house gone.
⏱New house goes up on the same footprint or a better one, whichever serves the block. Modern NCC envelope, better orientation, fit-for-purpose room sizes. The suburb stays the same; the house finally fits it.
⏱Final handover: new OC, six-year structural warranty, all the documentation on your Duffys Forest block you'd get on a greenfield build. The only difference is you still live in the street you chose.
⏱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
Explore Related Topics
Duffys Forest KDR — Start Here
Free KDR site assessment for Duffys Forest 2084. We'll assess your block, estimate cost, and provide a fixed-price budget.
Start Your ProjectMore in Duffys Forest
Other Buildana services in Duffys Forest
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Duffys Forest 2084. Northern Beaches Council regulations and local controls are covered on each page.