Do I need council approval for an extension in Oatley?

Usually yes. On the foreshore blocks and heritage streets it is a Development Application through Georges River Council, and a rear extension that sits behind the main roofline is well supported. Elsewhere many detached Oatley homes qualify for a Complying Development Certificate through a private certifier, which is significantly faster. We confirm which pathway applies to your property before quoting.

How long does a home extension take to build in Oatley?

Most extensions run 12 to 20 weeks on site. Design and approvals happen before that: a CDC takes about 4 to 8 weeks, and a DA can take up to 6 months, depending on council. We give you a programme with the quote, not after you have signed.

Can I live at home during the extension?

Usually yes. Because the work is concentrated at the rear or side, most Oatley families stay in the house for most of the build, with a shorter disruptive period when we break through and connect the new space to the old. We plan the breakthrough stage with you so you know exactly when it is coming.

Should I extend out or add a second storey in Oatley?

On most Oatley blocks a rear extension is the first option because it keeps the original front intact and the land is there. Where the block falls toward the water, a stepped rear extension can capture the outlook without going up, and where the view is only available higher, a second storey can be the right call. We build both, so the advice is honest: we look at your block and tell you which one your home actually wants. A house extension and a second storey are different builds with different engineering, and we quote both honestly.

Will the extension match my existing brick house?

That is a design decision, and both answers can work. Matching interwar or 1950s face brick exactly is often impossible because the brick is no longer made, so we either source the closest match and blend it, render the junction, or design a deliberately contemporary addition that lets the original house be itself. What must always match is the standard of the junction between old and new, which is where our detailing does its work.

How will I know what is happening during my extension?

Two ways. You get a weekly update from the builder running your job, whether or not there is good news in it. And you get access to our client portal, where you can log in any time to see your documents, selections, variations and job status. No chasing, no phone tag, no wondering.

Are you licensed and insured?

Yes. Strava Group holds NSW Builder's Licence 487370C and carries public liability insurance and Home Building Compensation Fund cover on all residential work over the statutory threshold. You can verify the licence directly through Verify NSW at verify.licence.nsw.gov.au.

Timber roof and wall framing in a renovation

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.

Get Your Extension Assessed Call 0450 605 080

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487370C

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Georges River Council areaNSW Builder’s Licence 487370CItemised quotesClear inclusions & exclusions0450 605 080

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.

An Oatley brick home with a small rear kitchen, an enclosed back verandah and a deep backyard running toward the trees is the brief we see most. Open the back, bring the living to the light, and let the house use its position.

Open-plan kitchen and dining area with a white island, bar stools and timber-look floors

Quick Answer

Most home extensions in Oatley 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. The value of the land here tends to justify extensions toward the upper end of the band, with foreshore sites and sandstone adding to it.

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.

Start here

Tell us about your Oatley 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.

Start Your Enquiry Call 0450 605 080

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.

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.

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.

Good to know

Oatley extension questions.

From our clients

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Nearby

Home extensions near Oatley.

We build extensions across St George and the surrounding suburbs. Select a suburb for local council information and what extensions there typically cost.

St George

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All Sydney extension areas

Looking for a different service in Oatley? We also build second storey additions and home renovations in Oatley.

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.

Get Your Extension Assessed Call 0450 605 080