Home Extensions · Strathfield NSW 2135
Home extensions in Strathfield, done properly.
Rear and side house extensions for Strathfield 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 Strathfield 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 Strathfield.
- 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 Strathfield home on a block built for it.
Strava Group builds home extensions in Strathfield: rear additions, side extensions and whole-of-back transformations that open the house to the garden. Strathfield has some of the largest residential blocks in the inner west, with grand Federation and interwar homes on the estate streets around The Boulevarde and Homebush Road, substantial 1950s and 60s brick on the surrounding streets, and heritage conservation areas protecting much of it. Land here is expensive and the houses are worth keeping, which makes a well designed rear extension the obvious move.
In Strathfield 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 in Strathfield.
Local knowledge
What we know about extending in Strathfield.
Every suburb builds a little differently. This is what matters when you are extending a Strathfield home.
Council
Strathfield is its own local government area under the Strathfield Local Environmental Plan 2012 and the Strathfield Consolidated Development Control Plan. Large parts of the suburb, including the estate streets around The Boulevarde, Homebush Road and Albert Road, sit inside heritage conservation areas where extensions go through a Development Application with a heritage assessment. Outside those areas 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 Strathfield Council and on the NSW Planning Portal.
Housing stock
Grand Federation and interwar homes on the estate streets, many of them individually listed, a broad stock of substantial 1950s and 60s brick houses, and later two storey homes. Many of the older houses have been extended once before, sometimes well and sometimes badly, and the earlier work often has to come off. The listed houses are always custom projects and their scope can sit above the range published on this page.
Structure
The older Strathfield homes are double brick on timber floors with hardwood framing and slate or terracotta roofs. Cutting a new opening into a double brick rear wall needs an engineered lintel and careful propping, and matching the new floor to an old suspended floor is a detail that has to be right. The post-war brick homes, often full brick on a slab, extend more simply once the load path is engineered.
Yard and block
Blocks in Strathfield are typically 700 to 1,200 square metres and often larger on the estate streets, which is unusual this close to the city. That leaves room for a substantial rear extension while keeping a real garden. Mature trees are protected under council controls and sometimes shape the design. Side access is usually generous on the larger blocks and tighter on the post-war streets.
Services and ground
Strathfield sits on shale derived clay soils that move with moisture, and the footings under a Federation house were never designed to modern standards. New footings are engineered for the site and detailed against the old ones so the extension does not settle away from the house. Old services, stormwater and absorption trenches on the larger blocks are located before we design.
Value
Strathfield is one of the highest value suburbs in the inner west, with the station, the school catchments and the estate streets holding demand, and the conservation areas protecting it. Buyers pay for original houses on big blocks that have been extended properly at the rear, and a considered extension that keeps the house intact and adds the living space the family needs is the safest improvement in the suburb.
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 Strathfield 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 it matters more on a century-old house whose original footings 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 Strathfield.
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 Strathfield the large blocks and the value of the houses tend to put projects in the upper part of the band, with heritage design work and older double brick structure adding to it, and some listed houses sitting above the range as custom builds. How much of the existing structure has to change is usually the largest single factor, followed by wet areas and the heritage process. We give you a realistic figure early rather than a low one that grows.
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 Strathfield and the inner west. Select a suburb for local council information and what extensions there typically cost. Looking for a different service in Strathfield? We also build second storey additions in Strathfield and home renovations in Strathfield.
Home extensions near Strathfield.
Strathfield and the inner west
Good to know
Strathfield extension questions.
How much does a home extension cost in Strathfield?
Do I need council approval for an extension in Strathfield?
How long does a home extension take to build in Strathfield?
Can I live at home during the extension?
Should I extend out or add a second storey in Strathfield?
Will the extension have to match my heritage house?
How will I know what is happening during my extension?
Are you licensed and insured?
Extend your Strathfield 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.
