Home Extensions · Horsley Park NSW 2175
Home extensions in Horsley Park, done properly.
Home extensions in Horsley Park by a licensed builder who plans the bushfire rating and the wastewater system before the floor plan. 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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Extending on acreage
Extending a home on Horsley Park acreage.
Strava Group builds house extensions in Horsley Park: new living wings, extra bedrooms and bathrooms, guest suites and big covered outdoor areas. Much of the suburb is zoned RU4 Primary Production Small Lots, so space is rarely the limit. What shapes an acreage extension is everything around the house: large parts of Horsley Park are bushfire prone, there is no reticulated sewer, and every new bedroom or bathroom adds load to the on-site wastewater system.
Extensions we build for Horsley Park homes:
- Living wings and family room extensions
- Extra bedrooms and bathrooms
- Guest and parent suites
- Large covered outdoor entertaining
- Bushfire rated construction to BAL
- Wastewater system upgrades, coordinated
- Wings linked by breezeways
- Attached garages and workshops
Happy with the size and want the inside to work better? See home renovations in Horsley Park. For a new home on your land instead, our custom homes and knockdown rebuilds page covers that path, and second storey additions are there if you want to build up.
On acreage the floor plan is the easy part. Whether the treatment system can take two more bedrooms, and what the bushfire rating does to the windows, decide the budget, so we answer those first.
Quick Answer
Most home extensions in Horsley Park 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 bushfire rating, any wastewater upgrade and the size of the new wing move the figure most here. Larger living wings on acreage can sit at the top of the band or above it, and we tell you early if yours does.
Local knowledge
What we know about extending in Horsley Park.
Extending on rural land brings questions a suburban lot never asks. These are the ones that matter in Horsley Park.
Zoning and approval
Horsley Park is in the Fairfield City Council area, and much of it is zoned RU4 Primary Production Small Lots under the Fairfield LEP 2013. Additions on rural zoned land can sometimes be approved as Complying Development under the rural housing provisions, but the higher bushfire ratings rule that out and point to a DA. See Fairfield City Council and the NSW Planning Portal.
Bushfire
Large parts of the suburb are bushfire prone. An extension there needs a Bushfire Attack Level assessment, and the new work is built to the rating: ember protection, rated glazing, metal mesh screens and non-combustible materials as the level rises. The rating applies to the new work, so we get it before design and price it in.
Wastewater
Horsley Park has no reticulated sewer, so homes rely on on-site wastewater systems. Adding bedrooms or bathrooms raises the design load, and the existing system may need assessing, upgrading or replacing, which needs approval from council. We have the system looked at during the site inspection, so the extension and any upgrade are designed and priced together.
Placing the extension
Space is rarely the problem on acreage, so the new wing can be placed for sun, outlook and how the outdoor areas work, instead of squeezed against a boundary. We also keep it clear of the effluent dispersal area and any future replacement area for it.
Buried services
On a large lot, power, water, stormwater and wastewater lines can run a long way from the house. We trace them before design, because moving a buried line is cheap on paper and expensive in the ground.
Staying on the land
The Sydney International Equestrian Centre on Saxony Road is a reminder that Horsley Park is rural land inside the city, and that land is hard to replace. A well built extension adds the space a family needs without giving any of it up.
Start here
Tell us about your Horsley Park 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 Horsley Park 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 Horsley Park.
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.
On Horsley Park acreage the build itself is efficient, because access and space are good. The bushfire rating and the wastewater system are what move the number: higher BAL construction and a treatment system upgrade can add significantly, which is why both are assessed before we quote. How much of the existing structure has to change still matters, followed by wet areas.
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
Horsley Park 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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Clara Shabow
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Nearby
Home extensions near Horsley Park.
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 Horsley Park? We also build second storey additions and home renovations in Horsley Park.
Extend your Horsley Park 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 Horsley Park
Other Strava Group services in Horsley Park
Each page covers the local council, the homes we see in Horsley Park and what that kind of project typically costs.