Home Extensions · Smithfield NSW 2164
Home extensions in Smithfield, done properly.
Home extensions in Smithfield by a licensed builder, with flood levels near Prospect Creek and the condition of the existing house checked before design. 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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Room to grow at the back
Extending a Smithfield home properly.
Strava Group builds house extensions in Smithfield: rear family rooms, extra bedrooms, bathrooms and covered outdoor areas. Smithfield’s residential streets sit within Fairfield City Council, and they hold a mix of fibro and older brick homes, many already extended once or twice. A good extension here sorts out the earlier additions, meets the flood controls where they apply near Prospect Creek, and leaves one well built house instead of a collection of pieces.
Extensions we build for Smithfield homes:
- Rear family room extensions
- Removing and replacing old additions
- Extra bedrooms and bathrooms
- Recladding fibro homes with the extension
- Extensions designed to flood floor levels
- Covered outdoor living areas
- Kitchen moves into the new space
- Insulation and window upgrades at the same time
Would a new layout inside solve it without adding space? See home renovations in Smithfield. Thinking of building up instead? See second storey additions.
Plenty of Smithfield homes have had two or three additions over the years, each built to a different standard. The best extension we can build here often starts by taking most of them off.
Quick Answer
Most home extensions in Smithfield 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 earlier additions, recladding fibro and meeting a flood floor level move the price more than anything else here.
Local knowledge
What we know about extending in Smithfield.
Smithfield rewards a careful look at both the house and the lot. This is our checklist.
Council
Housing in Smithfield comes under the Fairfield LEP 2013, while the Cumberland side of the suburb is industrial. The Fairfield LEP has no heritage conservation areas, so many rear extensions can use Complying Development through a private certifier. See Fairfield City Council and the NSW Planning Portal.
Prospect Creek
Lots near Prospect Creek can carry flood planning controls, set through the Fairfield LEP flood clauses, council’s flood studies and the DCP. The planning certificate tells you if they apply. When they do, the new floor has to meet council’s flood planning level, and materials below it must handle getting wet.
Fibro homes
Fibro homes from the post-war decades can extend well if the frame is sound. Because old fibro may contain asbestos, every sheet that will be cut or removed is tested first and handled by a licensed contractor. Many owners use the extension to reclad the whole house, so new and old finish in the same material.
Earlier additions
We check each earlier addition’s footings, framing and roof flashing before deciding what stays. Additions on thin slabs, or without proper ties to the house, usually come off, because attaching new work to them carries their problems into the new room.
Footings and services
Clay soils call for footings engineered to a geotechnical site classification and detailed against the old house. We also locate the sewer main and stormwater lines before design, since building close to Sydney Water assets needs their sign-off.
A typical extension
A 30 to 40 square metre rear addition with a family room, kitchen and second bathroom, built on its own footings, with the old rear additions removed and the house reclad so it reads as one building.
Start here
Tell us about your Smithfield 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 Smithfield 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 Smithfield.
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 Smithfield the condition of the existing house and its earlier additions matters as much as the new room. Asbestos testing and removal, recladding and flood floor levels near Prospect Creek tend to put projects in the middle of the band, and how much of the existing structure has to change sets most of the rest.
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
Smithfield 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
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Jonathan
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Clara Shabow
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Jonathan Jajo
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Nearby
Home extensions near Smithfield.
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 Smithfield? We also build second storey additions and home renovations in Smithfield.
Extend your Smithfield 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.
More in Smithfield
Other Strava Group services in Smithfield
Each page covers the local council, the homes we see in Smithfield and what that kind of project typically costs.