Home Extensions · Oatley NSW 2223
Home extensions in Oatley, done properly.
Rear and side house extensions for Oatley 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 Oatley 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 Oatley.
- 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
Opening an Oatley home to the garden and the water.
Strava Group builds home extensions in Oatley: rear additions, side extensions and whole-of-back transformations that open the house to the yard. Oatley is one of the best kept suburbs in the St George area: a peninsula bounded by the Georges River and Oatley Bay, with interwar and post-war homes on generous blocks, the park and the bush at the end of the street, and a village that has held its character. The land is valuable, the blocks have depth, and the brief is nearly always the rear.
In Oatley 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 Oatley.
Every suburb builds a little differently. This is what matters when you are extending a Oatley home.
Council
Oatley sits in the Georges River Council area under the Georges River Local Environmental Plan 2021 and the Georges River Development Control Plan. Foreshore controls apply near the river and the bay, and some streets carry heritage controls, where extensions go through a Development Application. Elsewhere many detached homes can use Complying Development through a private certifier. We confirm the pathway for your property before quoting. Current planning controls are published by Georges River Council and on the NSW Planning Portal.
Housing stock
Interwar brick bungalows and Federation cottages on the older streets near the station and the village, a large stock of 1950s and 60s full brick and brick veneer homes, and later houses on the foreshore blocks. Many carry a sunroom or enclosed verandah added decades ago that was never built to last. Those earlier additions usually come off and are replaced with something engineered.
Structure
Mid-century brick veneer homes are straightforward to extend once the load path is engineered. The older full brick and interwar houses need more care at the junction: we cut the openings cleanly, install engineered steel and tie the new frame into the existing brickwork properly, and the new floor has to meet an old suspended floor exactly. On the sloping foreshore blocks the new floor often steps down the site.
Yard and block
Oatley blocks are typically 550 to 800 square metres, often deeper than they are wide, with the streets toward the river and the bay falling away to the water. The slope shapes the design on those blocks, and the outlook into the trees or over the water becomes the best feature of the new rooms. Side access is usually workable.
Services and ground
Oatley sits on Hawkesbury sandstone, often close to the surface toward the foreshore, with shale clay on the higher ground. That makes footings predictable on some blocks and awkward on others where rock has to be cut, so the engineering is done for your site. New footings are detailed against the existing ones so the extension does not settle away from the house. Services along the rear boundary are located before design starts.
Value
Oatley is one of the most tightly held suburbs in St George, with the station, the village, the park and the water keeping demand strong. Buyers pay for a character house with a properly built modern rear, and an extension that delivers that is one of the safest improvements you can make here, and far cheaper than buying the bigger house down the street.
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 Oatley 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 on Oatley sandstone the challenge is usually matching new rock-founded footings to old ones that were never engineered.
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 Oatley.
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 Oatley the value of the land tends to justify extensions in the middle and upper part of the band, with foreshore sites, sandstone and older full brick structure adding engineering work. How much of the existing structure has to change is usually the largest single factor, followed by wet areas, access and rock.
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 St George and the surrounding suburbs. Select a suburb for local council information and what extensions there typically cost. Looking for a different service in Oatley? We also build second storey additions and home renovations.
Home extensions near Oatley.
St George
Good to know
Oatley extension questions.
How much does a home extension cost in Oatley?
Do I need council approval for an extension in Oatley?
How long does a home extension take to build in Oatley?
Can I live at home during the extension?
Should I extend out or add a second storey in Oatley?
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 Oatley 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.
