Home Extensions · Kellyville NSW 2155
Home extensions in Kellyville, done properly.
Rear and side house extensions for Kellyville homes by a licensed extension builder. Most extensions run $70,000 to $300,000 depending on size and how much of the existing house has to change, itemised quote, honest programme, one builder from concept to handover.
Start here
Tell us about your Kellyville home.
No sales pitch, no obligation. Here is exactly what happens when you enquire:
- 1Answer a few quick questions. One at a time, takes about two minutes, so the first conversation is about your project rather than the basics.
- 2We call you within 24 to 48 business hours. A builder, not a salesperson. Then we walk your home and yard with you on site in Kellyville.
- 3You receive a written, itemised estimate. Real numbers for your home. If the project does not stack up, we tell you that too.
From our clients
Rated 5.0 on Google.
“We had Strava Group complete major renovation works on our property and were blown away with the quality. The attention to detail and overall finish were amazing.”
“Great communication, honest work, easy to work with, highly recommend to work with for any new build/renovations. If you are looking to get work done without worrying about shortcuts Strava Group is builder to use.”
“I highly recommend Strava Group to everyone great workmanship, reliable service, and I couldn’t be happier with the result.”
Extending out, not up
Extending a Kellyville home the right way.
Strava Group builds home extensions in Kellyville: rear additions, side extensions and whole-of-back transformations that open the house to the yard. Kellyville is younger than most suburbs we build in: the older streets near Windsor Road carry homes from the 1980s and 90s on generous blocks, while the newer release areas run tighter lots with larger two storey houses. The two halves of the suburb extend differently, and the first thing we work out on site is which one your home belongs to.
In Kellyville we regularly deliver:
- Rear extensions and additions
- Side extensions on wider blocks
- Open plan kitchen, dining and living
- Alfresco and indoor-outdoor connections
- New master suites and family rooms
- Laundries, mudrooms and storage done properly
- Structural openings between old and new
- Exterior upgrades to tie old and new together
Thinking about going up instead? That is a different build with different engineering, and we do that too: see second storey additions.
Local knowledge
What we know about extending in Kellyville.
Every suburb builds a little differently. This is what matters when you are extending a Kellyville home.
Council
Kellyville sits in The Hills Shire Council area under The Hills Local Environmental Plan 2019 and the Hills Development Control Plan. Most detached homes on standard residential zoning can pursue a ground floor extension through Complying Development with a private certifier rather than a full DA, subject to setbacks, site coverage and landscaped area, which bite harder on the smaller release-area lots. We confirm the pathway for your property before quoting. Current planning controls are published by Hills Shire Council and on the NSW Planning Portal.
Housing stock
Brick veneer and full brick homes from the 1980s and 90s on the established streets, and larger two storey project homes on the newer estates toward North Kellyville. The older homes have the classic layout problem: formal rooms at the front, a modest kitchen, and a back door onto a paved area. The newer homes are bigger but often short a living zone or an alfresco connection worth having.
Structure
Brick veneer homes of this era are straightforward to extend, with timber framed walls and trussed roofs that take a new structural opening well once the load path is engineered. On the newer two storey homes the extension has to respect the existing structure above, so the load path work is done carefully before anything is promised.
Yard and block
The established Kellyville blocks are typically 700 to 1,000 square metres, which leaves room for a substantial rear extension while keeping a real backyard. The newer release lots run 300 to 500 square metres, where site coverage and landscaped area controls shape what can be added, and the design has to earn every square metre. We tell you honestly what your lot will carry before you spend money on design.
Services and ground
Kellyville sits on shale and clay derived soils that move with moisture. New footings on an extension have to be engineered for the site class, not copied from the original house, and detailed against the existing slab so the two do not settle at different rates. On the newer estates the services are modern and well documented, which simplifies the design stage.
Value
Kellyville is one of the growth centres of the Hills, with the Metro, the schools and the town centres holding demand. A well built extension that gives a 1990s house the open plan rear it never had, or adds the living zone a newer home is missing, is one of the most reliable improvements you can make here, and it usually costs less than the stamp duty and agent fees involved in moving.
The Strava standard
How we build differently.
An extension lives or dies at the junction between old and new. We build for longevity, and on every Kellyville extension we run:
Every new-to-existing junction properly detailed
This is where most extensions crack, leak and part company with the house. It is almost always a detailing shortcut, not settlement. Ours get a proper structural tie, flashing and movement detail.
The existing structure gets rectified, not covered
Where the extension meets the house, we screw off and re-brace the adjoining structure, tying new and old together so the whole building moves as one and future cracking is designed out, not painted over.
Footings matched to the ground, not the minimum
New footings are engineered for your soil and detailed against the existing ones, because differential movement between old and new slabs is the classic extension failure, and Hills clay soils make it more likely, not less.
Furring channels for a dead flat finish
Where new ceilings and walls run through to existing rooms, furring channels give one level plane across both, so you cannot see where the house ends and the extension begins.
Waterproofing is a documented hold point
New wet areas are inspected and photographed before a single tile goes on, to AS 3740, and new roof-to-old-roof junctions get the same treatment.
Everything photographed before it is covered
You receive the record at handover, so in ten years you know exactly what is behind your walls and under your floor.
Before starting Strava Group, I spent seven years on the tools as a carpenter and five years running sites. The failures I kept seeing in extensions were always at the join: cracked cornices along the old wall line, roofs that leaked where new met old, floors that stepped as slabs settled differently. None of it was illegal. All of it was avoidable. None of this shows up in a finished-room photo. All of it shows up in year seven.
Honest numbers
What a house extension actually costs in Kellyville.
Most builders will not put numbers on a website. We will, because the alternative is wasting your time and ours across three meetings before anyone mentions a figure.
Preliminaries are the costs that exist before a single wall moves: site fencing, temporary services, waste removal, insurances, engineering and supervision. They are real, they are unavoidable, and a quote that does not show them separately has either buried them or forgotten them.
In Kellyville the established blocks support substantial extensions in the middle of the band, while the tighter release lots keep footprints smaller and costs lower. How much of the existing structure has to change is usually the largest single factor, followed by wet areas and site coverage limits on the newer lots.
Every project is quoted properly after a site inspection. These ranges are here so you can decide whether it is worth a conversation.
Nearby We build extensions across The Hills and the surrounding suburbs. Select a suburb for local council information and what extensions there typically cost. Looking for a different service in Kellyville? We also build second storey additions and home renovations.
Home extensions near Kellyville.
The Hills
Good to know
Kellyville extension questions.
How much does a home extension cost in Kellyville?
Do I need council approval for an extension in Kellyville?
How long does a home extension take to build in Kellyville?
Can I live at home during the extension?
Should I extend out or add a second storey in Kellyville?
Will the extension match my existing brick house?
How will I know what is happening during my extension?
Are you licensed and insured?
Extend your Kellyville home properly.
Ready for more room?
Tell us about your property and what you want to add. We respond within 24 to 48 business hours with honest advice and real numbers, no cost, no obligation.
