The Hills District · AS 3660.1
Decades of decks, pergolas and extensions have reshaped Winston Hills homes since the 1960s, and each of those additions is exactly where we look hardest for a hidden termite gap.
Quick answer
Winston Hills sits in a termite-prone area under the NCC, so any new home or knockdown rebuild here needs a compliant termite management system before the Occupation Certificate is issued. The system meets AS 3660.1, with collars fitted to every penetration and the perimeter closed off ahead of the concrete pour, then a certificate prepared for your certifier once the work is complete.
Termite barriers in Winston Hills
Winston Hills is about 24 km north-west of the Sydney CBD in postcode 2153, falling within the City of Parramatta and The Hills Shire. Much of the suburb was developed from the 1960s by Hooker Rex, and today there is little undeveloped land left, with streets mostly lined by brick and brick-veneer family homes with established gardens, many now renovated or extended. Winston Hills Mall is the main shopping centre, supported by smaller local groups such as the Chisholm, Lomond and Rebecca Parade shops, and the Toongabbie Government Farm archaeological site points to a much older history. Most of our work here is knockdown rebuilds and renovations on that original 1960s stock.
Toongabbie Creek runs along the suburb, and its corridor carries moisture, trees and wildlife into neighbouring yards. Combined with homes that are now fifty or more years old, that creates steady termite and possum pressure across much of Winston Hills. Many houses have had decks, pergolas and extensions added over the decades, and each addition can create new hidden paths for termites or new gaps for rats to use that weren't part of the original construction. A rebuild here needs these later changes checked as carefully as the original building, not just the new slab edge.
Reviewed by Ismail, founder · The Hills District coverage · Updated September 2026 · More The Hills District suburbs
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Local conditions
What drives termite risk in Winston Hills comes down to the creek, the age of the housing, and decades of additions.
Toongabbie Creek runs along the suburb, carrying moisture, trees and wildlife into neighbouring yards well beyond its immediate banks. That dampness is what subterranean termites rely on to forage, so blocks near the creek get extended perimeter treatment rather than a standard-width strip.
Most Winston Hills homes date from 1960s development by Hooker Rex, putting them well past the working life of whatever termite protection was originally installed. A rebuild needs a genuinely fresh system, and we treat the site that way rather than assuming any trace of the old protection still holds.
Many Winston Hills houses have had decks, pergolas and room additions built on over the decades, and the join between the original structure and each later addition is a common place for a termite entry point to go unnoticed. We check these junctions carefully on any job that isn't a full rebuild.
What we install here
We handle Winston Hills knockdown rebuilds on the original 1960s stock, extensions and renovations where additions have been built onto the original house, and the occasional granny flat where a block has room. Waffle pod and raft slabs suit most full rebuilds, while extensions often need a suspended floor tied carefully into the existing structure. Pricing is one figure off the plans, scheduled to finish the barrier stage well ahead of your builder's pour or footing date.
Local knowledge
A good share of our Winston Hills work sits near Max Ruddock Reserve, where trees, mulch and leaf litter give spiders, ants and mice shelter beside older houses. Winston Hills Mall, the main shopping centre, adds food waste that can support rats and cockroaches in surrounding streets. Toward Impeesa Reserve and the Toongabbie Creek corridor, leafy green space brings possums and spiders toward homes, and we check drainage and sub-floor ventilation closely on blocks near the creek.
Winston Hills builds are certified through either the City of Parramatta or The Hills Shire depending on which side of the suburb boundary the block falls, and both expect the same documented proof of a compliant termite system. We fix a durable notice in the meter box and prepare a separate installation certificate naming the products, protected areas and installer, ready for whichever certifier is handling your file.
Winston Hills at a glance
| Suburb | Winston Hills, NSW 2153 |
|---|---|
| District | The Hills District |
| Distance from Sydney CBD | 24.0 km north-west |
| Certifying council | Sydney CBD Council |
| Standard applied | AS 3660.1 termite management systems |
| Installed | Before the slab pour, then staged through the build |
| Documents supplied | Installation certificate and durable notice |
| Typical builds covered | New homes, knockdown rebuilds, granny flats, duplexes, townhouses |
Systems we install
Every photo below is from one of our own Sydney jobs. We look at your slab design, site and budget, then recommend a system or a combination.
01A termite-resistant sheet laid over the whole prepared footprint before concreting, so termites can't come up through the slab anywhere.
02A sealed collar on every pipe, conduit and service that passes through the slab. These gaps are the most common hidden way in.
03Protection at the slab edge and into the wall cavity, which stops termites building hidden tunnels up the outside of the slab.
04An APVMA-registered termiticide zone in the soil, with an optional pipe network under paving so it can be recharged later without digging.
05Barriers for bearers, piers and raised timber floors on sloping or elevated blocks, where there's no slab to protect.
06Detailing for sandstone cuts, block retaining walls, step-downs and cut-and-fill sites, which are common across Sydney.
Why during construction
A retrofit can only treat around a finished house. A pre-construction system protects the parts nobody will ever be able to reach again.
A barrier put in during the build costs a fraction of a post-construction system, and far less than repairing termite damage.
New houses (Class 1) and outbuildings (Class 10) with termite-susceptible framing need a compliant termite management system.
Pipe penetrations and slab joints can only be fully protected while they're still open, before the concrete goes in.
An under-slab system covers ground that no treatment from outside the finished house can ever reach.
Your certifier needs the certificate and durable notice before issuing the Occupation Certificate. We supply both together.
Documented, compliant protection gives buyers, building inspectors and lenders confidence when the home is sold.
Installation stages
A termite barrier isn't a single visit. Each part goes in when the site is ready for it, and we fit around your plumber, concreter and bricklayer.
Send your plans and slab details. We recommend a system and give you one fixed price that covers every stage.
Collars go on every service once the plumber has set out, then the membrane or soil treatment is installed across the prepared site.
Perimeter and cavity protection is fitted as the brickwork or cladding goes up, so there's no unprotected gap at the slab edge.
Where it's specified, the chemical perimeter or reticulation system is completed around the building before paths and gardens go in.
A durable notice goes in the meter box, and the installation certificate goes to your builder and certifier.
The owner gets simple care instructions and an inspection schedule so the system keeps doing its job for years.
Compare systems
Both can meet AS 3660.1. The best choice depends on your slab type, what surrounds the house and how much ongoing upkeep the owner wants.
Physical protection
Entry-point protection
Soil protection
Top-up protection
Most of the Sydney builds we work on use a combination: physical collars on every penetration plus a physical or chemical perimeter.
For builders & developers
Builders, developers and owner-builders get a fixed quote from plans, a technician who turns up when the site is ready, and paperwork that never holds up sign-off.
Consistent pricing across lots, one point of contact and a full document set for every dwelling.
Missing durable notices and unclear install records are a common reason Occupation Certificates get held up. We hand everything over together so your certifier has it all in one go.
Paperwork
A complete document set for the builder, the certifier and every future owner of the property.
A permanent notice in the meter box showing the system, install date, installer, any chemical's life expectancy and inspection advice.
For: certifier, owner, future owners
Written confirmation of the system and products used, the areas protected and our licence details.
For: builder, certifier, owner
Details of the physical system or termiticide installed, including safety data sheets for any chemicals.
For: builder, owner
How to keep the system working, plus the recommended inspection frequency under AS 3660.2.
For: homeowner
From real jobs
Photos from our own Sydney sites, not stock images. Tap any photo to see it larger.
Membrane barrier across a large residential slab
Barrier work on a Sydney Harbour site
Installation through sandstone excavation
Perimeter barrier and sleeves on a new slab
Waffle pod formwork with collared penetrations
Membrane detailed against a retaining wall
Membrane sealed around a column
Protected slab edge with collar in place
Collared penetrations before the pour
Perimeter barrier on a completed slab edge
Pipe penetrations sealed into the membrane
Collars fixed through mesh before concreting
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Real, verified reviews from homeowners and businesses we've worked with.
Pricing
Every build is different, so we don't guess. We price from your plans and give you one fixed written quote. Quoting is free.
After handover
A barrier only works while it stays intact and visible. Pass these on to the owner.
Free fixed quote
Tell us about your build and get a clear, fixed price, fast. We usually reply within 30 minutes during business hours.
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Winston Hills questions
Still unsure? Call and talk it through with a licensed technician.
+61 450 515 215In almost every case, yes. Original protection from the suburb's 1960s development is now well past its working life, so a rebuild calls for a genuinely new install rather than any attempt to patch or verify whatever's left of the old one. Given how many decades have gone by, that's simply the more dependable path.
Yes. Ground close to the creek stays damp for longer than blocks further away, and that persistent moisture is exactly what subterranean termites use to forage. We extend the treated zone further around any low-lying section of the perimeter on blocks near the creek and check drainage carefully before pricing the work.
Yes, and it's common given how many original houses here have had decks or rooms added over the decades. We check the join between the old structure and each later addition carefully, since that seam is where a hidden entry point is most likely to be, then detail the barrier to cover the whole footprint properly.
In most cases, yes. The National Construction Code requires a termite management system for new houses and outbuildings in termite-prone areas where the primary building elements can be damaged by termites. Sydney is termite-prone, so the system is installed to AS 3660.1 and your certifier asks for the installation certificate and durable notice before the Occupation Certificate is issued.
It depends on slab area, perimeter length, the number of pipe penetrations, the system chosen, site complexity and how many visits the build needs. Send us the plans and we return one fixed written quote covering every stage. Quoting is free.
Nearby
Same crew, same staging and the same certifier-ready paperwork, right across the The Hills District.
Service areas
From the Eastern Suburbs and Inner West to the Hills, the Shire and the western growth corridors. Every suburb has its own page with the local ground conditions, the council that certifies the work and the questions builders there ask us.
Slab pour coming up?
Send us your plans today for a fixed quote, or call and talk to a licensed technician about your site.
