Canterbury-Bankstown · AS 3660.1
Under-slab membrane, collars and a perimeter system installed for Narwee knockdown rebuilds and extensions on 1950s timber-pier blocks, beside the Broad Arrow Road shops and Narwee station.
Quick answer
A rebuild or new home in Narwee needs a termite management system, because the suburb is a termite-prone part of both the Canterbury-Bankstown and Georges River council areas. The National Construction Code requires a system built to AS 3660.1, fitted while the slab is still open. Once installation is complete, we put together the installation certificate and durable notice for whichever council is certifying your build.
Termite barriers in Narwee
Narwee is shared between the City of Canterbury-Bankstown and Georges River Council, about 15.5 km south-west of the Sydney CBD in postcode 2209, with most of its growth coming in the 1950s and suburban family homes still dominating its tree-lined streets. The main shopping strip runs along Broad Arrow Road beside Narwee station on the Airport and South line, with the Narwee Hotel nearby, and the former Narwee High School site, closed in 2001, has been redeveloped for housing. A steady run of knockdown rebuilds on the older 1950s blocks makes up most of our work in the suburb.
Houses from that decade were commonly built with timber floors on brick piers and tiled roofs, and it is that sub-floor and roof void combination that termites and rats find easiest once they get past the outer wall. Demolishing one of these houses does not clear the activity that timber-pier construction has supported for seventy years, so the soil around a new footprint needs the same attention as the slab edge itself. The shopping strip and rail corridor along Broad Arrow Road add older commercial buildings nearby too, which is worth knowing if your rebuild sits close to that stretch.
Reviewed by Ismail, founder · Canterbury-Bankstown coverage · Updated September 2026 · More Canterbury-Bankstown suburbs
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Local conditions
Three local conditions shape how a termite barrier is planned for a Narwee rebuild.
1950s Narwee homes typically sit on timber floors over brick piers, a sub-floor arrangement termites find easily once they are past the outer edge. We inspect what remains of that structure before pricing a rebuild's system.
Narwee's tree-lined streets hold more fallen timber and shaded, damper soil than a newly cleared estate, which gives termites an easier approach to a rebuild site. We check plantings close to the new footprint as part of every quote.
Older shops and the pub beside Narwee station have had decades for timber to be found by termites, and a rebuild close to that strip inherits some of that same pressure. We factor the site's proximity to the shops into the plan.
What we install here
Most of our Narwee work is a knockdown rebuild, extension or granny flat on an established 1950s block, plus the occasional infill site near the old high school land. We fit under-slab membrane, collars and a perimeter suited to timber-pier construction, checking any retained roof void as closely as the new slab. Pricing is one fixed figure from the plans, and we schedule the visit around your builder's own program rather than a date of our own choosing.
Local knowledge
Narwee station and the Broad Arrow Road shops sit close to much of the suburb, and the rail corridor together with the commercial strip is a common feature of site conditions nearby. Windarra Reserve holds grass and trees that shelter pests close to several homes. Further out, Canterbury Public Golf Course and Riverwood Plaza mark the edge of the wider district, where irrigated turf and retail activity add their own conditions rather than affecting Narwee blocks directly.
Certification in Narwee depends on which side of the suburb a block sits, either the City of Canterbury-Bankstown or Georges River Council, though both ask for identical paperwork before the Occupation Certificate is released. We confirm the correct authority early, then supply an installation certificate naming the products and protected areas alongside a durable notice fitted permanently inside the meter box.
Narwee at a glance
| Suburb | Narwee, NSW 2209 |
|---|---|
| District | Canterbury-Bankstown |
| Distance from Sydney CBD | 15.5 km south-west |
| Certifying council | Georges River 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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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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Narwee questions
Still unsure? Call and talk it through with a licensed technician.
+61 450 515 215Not for the termite system itself. Whether your block falls under the City of Canterbury-Bankstown or Georges River Council, both require the same installation certificate and durable notice before the Occupation Certificate can be issued. We check which authority applies to your address early so the paperwork is addressed correctly from the start.
Yes. That construction is exactly the kind of sub-floor space termites find easily, so we inspect what is left of it once demolition is done, then size the collars, under-slab work and perimeter to AS 3660.1 based on what the site shows us rather than a standard assumption.
Once your plumber has set out the new drainage and before the concreter arrives, the same window as any other new slab in the area. Tell us your expected pour date as early as possible so we can lock in a visit that fits your builder's schedule without holding up the rest of the job.
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 Canterbury-Bankstown.
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.
