Home Extension North Kellyville — Design, Approval, Structural, Build
Full-service extensions in North Kellyville 2155: structural survey of existing 2010s+ contemporary home, design, The Hills Shire Council approval, engineering, weatherproofed construction, matched finish to original dwelling.
HIA Member
MBA NSW0476 300 300Extending Homes in North Kellyville
A home extension in North Kellyville gets the straight answer — the 2010s+ stock is young, and most plans here still work. I decline more extension briefs in this release than I take.
Where the family genuinely outgrew the home, the 350 to 650m² blocks take a designed-to-the-metre rear addition with the estate guidelines checked and the clay junctions engineered.
At the $1.4M to $1.9M range, the targeted wing can beat trading up within the release — when it is actually needed.
We build these fixed-price, licence HBL 487805C. Give me the brief and you will get an honest read back.
Buildana manages the complete home extension process in North Kellyville — 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 North Kellyville from $150K
- The Hills Shire Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 2010s+ contemporary-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Bus to Kellyville Metro (3 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Most homes here don't need it yet
North Kellyville's homes are mostly under a decade old with plans that already work — and I say so rather than sell you a wing you do not need.
The genuine cases: bought small, family grew, the plan is truly out of room.
Precise where it proceeds
The compact blocks demand designed-to-the-metre additions — guidelines checked, junctions engineered, every metre earning its keep.
Every metre is priced up front, designed before you commit.
Home extension builder in North Kellyville — key facts
- Suburb
- North Kellyville, NSW 2155
- Council / LGA
- The Hills Shire Council (The Hills)
- Primary zoning
- R2 Low
- Typical lot size
- 350–650m²
- Soil class
- M
- Median house price
- $1.4M–$1.9M
- Home era
- 2010s+ 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
We extend North Kellyville homes with a structural engineer on every job. Second storey, rear addition, multi-room — engineered and priced upfront.
How It Works
From First Call to Final Key
Extension feasibility comes down to two things: what the existing structure can carry, and what The Hills Shire Council will let you build. We assess both at the consultation — no point designing for a second storey if the slab can't take the load.
⏱Extension designed to integrate with your existing North Kellyville home — matching roof lines, materials, and flow between old and new sections. Floor plans, elevations, and 3D renders.
⏱All approval documentation prepared: structural drawings, BASIX, shadow analysis, stormwater, and statement of environmental effects (if DA). Lodged and managed through to Construction Certificate.
⏱Extension construction takes 3–6 months on average. Footings excavated and poured to match existing depth on Class M soil, frame stand, roof tie-in (most weather-critical phase), lock-up, then internal fit-out at the same standard as the existing house.
⏱Defect-free inspection, OC issued, 6-year warranty on all new work. Junction between old and new sections waterproofed and warranted. Maintenance guide covers care of new and existing areas.
⏱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
Add Space to Your North Kellyville Home
Free design consultation for North Kellyville 2155. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in North Kellyville
Other Buildana services in North Kellyville
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in North Kellyville 2155. The Hills Shire Council regulations and local controls are covered on each page.