Home Extensions · Sydney
Home extensions in Sydney, done properly.
Rear and side extensions across Sydney by a licensed builder. Most extensions run $70,000 to $300,000 depending on size and how much of the existing structure has to change, itemised quote, honest programme, one builder from concept to handover.
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Extending out, not up
More space, on the ground you already own.
Strava Group builds home extensions across Sydney: rear additions, side extensions and whole-of-back transformations that open the house to the yard. Extending out suits homes with land to spare, and it is usually the fastest way to get a bigger kitchen, open plan living and a real connection to outside.
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.
The best extensions do not just add a room. They fix the whole back of the house: where the kitchen sits, how the living opens to the yard, and where the light comes from all day.
Quick Answer
Most home extensions run $70,000 to $300,000 depending on size and how much of the existing structure has to change, at roughly $2,500 to $4,500 per square metre for ground floor work, with around $30,000 in preliminaries (design, engineering and council approvals, plus site set-up) on top. Structural openings back into the house, wet areas and site access move the figure most.
Stay or go
Cheaper than moving, better than settling.
Once you account for stamp duty, agent commission, legal fees and moving costs, changing suburbs in Sydney frequently costs more than the extension that would have solved the problem, and you keep the street, the neighbours and the school catchment you already have.
An extension can also be staged alongside a full renovation of the existing rooms, you pay the preliminaries once and open the walls once. And if the block will not carry an extension, we tell you before you spend money on design, and talk honestly about whether going up is the better path for your home.
Same address. Same street. A home that finally has room for the way you live.
Start here
Tell us about your home.
No sales pitch, no obligation. Here is exactly what happens when you enquire:
One at a time, takes about two minutes, so the first conversation is about your project rather than the basics.
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 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.
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 home extension actually costs in Sydney.
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.
| Item | Typical range |
|---|---|
| Home extension, depending on size and scope | $70k–$300k |
| Ground floor extension work | $2,500–$4,500 /m² |
| Preliminaries, on top of build cost | approx. $30,000 |
Preliminaries are the costs that exist before a single wall moves: design, engineering and council approvals, plus site set-up such as site fencing, temporary services, waste removal, insurances and supervision. They are real, they are unavoidable, and a quote that does not show them separately has either buried them or forgotten them.
The band is wide because extensions are wide: a modest rear addition sits at one end, a full-width open plan transformation with structural openings back into the house sits at the other. How much of the existing structure has to change is usually the largest single factor, followed by wet areas and site access.
Every project is quoted properly after a site inspection. These ranges are here so you can decide whether it is worth a conversation.
Good to know
Home extension questions.
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.
I couldn't be happier with the work from Strava Group. From the beginning, Stav and the team was friendly, honest, and super easy to deal with.
We engaged Strava Group for a home extension and renovation. We are incredibly happy with the service and the results we achieved. From day one Stav and team where always willing to help with any issues we had and we loved that the main focus was as quality and longevity. Highly recommended
Had a great experience with Strava Group. The team was easy to deal with, super professional, and kept me in the loop the whole way through. They really listened to what I wanted and made the whole process feel smooth and stress-free.
Aloona T.
Google review
Orom Gabriel
Google review
Jonathan
Google review
Clara Shabow
Google review
Jonathan Jajo
Google review
Eli Kosso
Google review
Service areas
Home extensions across Sydney.
We build extensions across 66 Sydney suburbs, concentrated in the north west, the Hornsby shire, the Ryde district, the inner west, western Sydney and St George. Select your suburb for local council information, the property types we see there and what extensions in that area typically cost.
The Hills District
Hornsby and the Northern Suburbs
Ryde, Hunters Hill and the North Shore
Inner West
Parramatta
Western Sydney
Southern Sydney and St George
Looking for a different service in one of these suburbs? We also build second storey additions and complete home renovations across the same areas. Not listed? We cover most of the Sydney metropolitan area. Get in touch and we will tell you honestly whether your location works for us.
Extend your 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.