Kenthurst Home Extension Builder — Live In, Build On
Buildana extends homes across Kenthurst 2156 while you stay in place. Mixed rural-era structure, The Hills Shire Council rules, weatherproofing during build — all managed locally from Fairfield.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Kenthurst costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, The Hills Shire Council approvals, and construction under one fixed-price contract.
Home Extension Builder in Kenthurst
A home extension in Kenthurst is a rural project, and space is the least of your worries. This is acreage country, 1 to 10ha-plus RU2 holdings on Hawkesbury Sandstone, so adding to the equestrian and lifestyle homesteads here is about compliance and siting rather than squeezing a footprint. Owners in the $3M to $8M-plus range are improving properties they mean to hold for the long run.
Acreage stacks the rules. Bushfire overlays are significant across the suburb, so an RFS assessment and BAL-rated construction apply to most work, and the sandstone means excavation is priced by test dig. A large ground-floor addition almost always makes more sense than going up out here, and where it sits against the land and the bush setback matters as much as how it is drawn.
What I would check first on a Kenthurst holding: the BAL rating and RFS path, the sandstone under the addition, and the siting against the bush. Those decide the feasibility.
We build these fixed-price, licence HBL 487805C. Start with a full site constraints review and we will handle it.
Buildana manages the complete home extension process in Kenthurst — 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 Kenthurst from $150K
- The Hills Shire Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- Mixed rural-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near No rail (rural) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Rural land, rural rules
This is acreage country, 1 to 10ha-plus RU2 holdings on Hawkesbury Sandstone, so adding to the equestrian and lifestyle homesteads is about compliance and siting rather than squeezing a footprint.
Owners in the $3M to $8M-plus range are improving properties they plan to hold for the long haul.
Bushfire and rock
Bushfire overlays are significant, so an RFS assessment and BAL-rated construction apply to most work, and the sandstone means excavation is priced by test dig.
A large ground-floor addition almost always makes more sense than going up, and siting against the land and the bush setback matters as much as the design.
Home extension builder in Kenthurst — key facts
- Suburb
- Kenthurst, NSW 2156
- Council / LGA
- The Hills Shire Council (The Hills)
- Primary zoning
- R2 Low
- Typical lot size
- 1–10ha (acreage)
- Soil class
- M
- Median house price
- $3M–$8M+ (acreage)
- Home era
- Mixed rural
- 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.
Cost Guide
| Item | Estimated Range |
|---|---|
| Small rear extension (up to 30m²) | $99,000 – $200,000 |
| Medium rear/side extension (30–60m²) | $200,000 – $350,000 |
| Large ground-floor extension (60–100m²) | $350,000 – $550,000 |
| Second-storey addition (60–120m²) | $310,000 – $610,000 |
| Wrap-around (ground + 1st floor) | $550,000+ |
| Structural engineering & tie-in | Included |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Walk through your Kenthurst home with our designer and structural engineer. We measure, photograph, and check the bones — footings, frame condition, roof structure. The cost estimate that follows is grounded in what we found, not a generic per-m² number. 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.
⏱The Kenthurst construction phase. Fixed price, programmed, supervised. Most rear extensions in Kenthurst qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through The Hills Shire Council because of overshadowing and privacy assessments. We choose based on your design, not on what's easier to lodge. Extension built from new footings to completion — connecting structurally to your existing home. Class M soil design managed. Temporary weatherproofing maintains liveability where possible.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. 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. Maintenance guide provided.
⏱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 Kenthurst
Free design consultation for Kenthurst 2156. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in Kenthurst
Other Buildana services in Kenthurst
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Kenthurst 2156. The Hills Shire Council regulations and local controls are covered on each page.