Home Extensions · Fairfield NSW 2165
Home extensions in Fairfield, done properly.
Home extensions in Fairfield by a licensed builder who checks what the old house is standing on before adding to it. 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.
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Adding on to an older house
New space on an older Fairfield home.
Strava Group builds house extensions in Fairfield: rear living rooms, extra bedrooms, second bathrooms and kitchens that finally open to the yard. Many of Fairfield’s older detached homes sit on timber floors over brick piers and carry a sleepout or lean-to added decades ago. An extension here usually starts by taking that old addition off and checking the frame it was attached to.
Extensions we build for Fairfield homes:
- Rear living and family room extensions
- Replacing old sleepouts and lean-tos
- Extra bedrooms and second bathrooms
- Kitchen extensions that open to the yard
- Extensions designed to flood floor levels
- Subfloor and frame repairs at the join
- Covered outdoor rooms
- Recladding to tie old and new together
If the house needs work inside more than extra space, see home renovations in Fairfield. If you would rather keep the whole yard, second storey additions may suit, subject to what the existing structure can carry.
A Fairfield extension often begins with demolition. An old fibro sleepout comes off the back, the wall behind it is checked for termites and rot, and only then does the new room go on. Skip that step and a brand new extension ends up bolted to a failing wall.
Quick Answer
Most home extensions in Fairfield 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. Removing an old sleepout, repairing subfloor timbers at the join and meeting a flood floor level make the biggest difference to the number here.
Local knowledge
What we know about extending in Fairfield.
Older houses reward a builder who looks before quoting. This is what we check on a Fairfield extension.
Council
Fairfield is governed by Fairfield City Council under the Fairfield LEP 2013. That LEP has no heritage conservation areas, but it does list individual heritage items, and a property holding one needs a Development Application. Many other extensions can use Complying Development through a private certifier. Check the controls with Fairfield City Council or on the NSW Planning Portal.
Creek flood controls
Lots close to Fairfield’s creeks can carry flood planning controls, which sit in the LEP flood clauses, council’s flood studies and the DCP. Fairfield has no LEP flood map layer, so your planning certificate is what says whether they apply. If they do, they fix a minimum height for the new floor, and the rest of the design follows from that number.
What is under the house
Many older Fairfield homes stand on brick piers with timber bearers and joists. Before connecting an extension, we inspect the subfloor and the wall frame at the join for termite, borer and rot damage and replace what has failed. The new section goes on an engineered slab or subfloor, detailed to settle in step with the old.
Old additions
Sleepouts, lean-tos and enclosed verandahs from past decades are common here, often on minimal footings with poor flashing. Most are not worth extending from. We remove them, test any fibro for asbestos first, and build the new room from proper footings. Confirmed asbestos is removed by a licensed contractor and priced in the quote.
Sewer and drainage
Older subdivisions often have the sewer main running across the backyard. We find it before design, because building over or beside it needs Sydney Water approval and can change the footing design. Roof water from the new section is connected to the stormwater system so it does not end up soaking the old footings.
A typical extension
A single storey rear addition of 25 to 45 square metres: open kitchen, dining and family, often a second bathroom, and a covered outdoor area off the new living room. On a timber floored house the new floor is set to line up with the old one, so nobody trips at the doorway.
Start here
Tell us about your Fairfield 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 Fairfield extension we run:
Every new-to-existing junction properly detailed
This is where most extensions crack, leak and part company with the house, and the cause is almost always a detailing shortcut. Ours get a proper structural tie, flashing and movement detail.
The existing structure gets rectified first
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. Future cracking gets designed out at frame stage instead of patched at the paint stage.
Footings engineered for the ground they sit on
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 an older house whose original footings were never engineered to modern standards.
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. Want more than photos? We can also capture a full 3D virtual model of the frame, plumbing, wiring and waterproofing before the plasterboard goes on, available as an optional add-on.
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 Fairfield.
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 Fairfield, the age of the house is what moves the number. Removing old additions, asbestos testing and subfloor repairs at the join add cost before the new room even starts, and flood floor levels can add more. After that, how much of the existing structure has to change and how many wet areas you add set the final figure.
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
Fairfield 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.
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Nearby
Home extensions near Fairfield.
We build extensions across the Fairfield area and the surrounding western suburbs. Select a suburb for local council information and what extensions there typically cost.
Fairfield and western Sydney
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 Fairfield? We also build second storey additions and home renovations in Fairfield.
Extend your Fairfield home properly.
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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.
More in Fairfield
Other Strava Group services in Fairfield
Each page covers the local council, the homes we see in Fairfield and what that kind of project typically costs.