Northern Beaches · AS 3660.1
Perimeter and under-slab barriers installed to AS 3660.1 for Cromer new homes and rebuilds near Narrabeen Lagoon and Cromer Golf Club's Arcus Tributary creek, postcode 2099.
Quick answer
Cromer borders Narrabeen Lagoon within a termite-prone stretch of Northern Beaches Council, which is why the National Construction Code calls for a termite management system on every new home or rebuild there. AS 3660.1 sets the installation method, completed before the slab pour. Sign-off on the Occupation Certificate depends on the certifier receiving a durable notice fixed in the meter box, plus an installation certificate.
Termite barriers in Cromer
Cromer was known as Dee Why West until 1940, when the Cromer Country Club took over the old Dee Why golf links and the suburb took its current name. It sits in postcode 2099, about 15.7 km north-east of the Sydney CBD in the Northern Beaches Council area, bordered to the north-east by Narrabeen Lagoon, and most of the housing dates from the building boom after the Second World War. New work in Cromer today is mostly knockdown rebuilds of those post-war houses, since much of the suburb was developed decades ago and many original homes still carry the termite protection standards of their era rather than a current AS 3660.1 system.
Water and bushland sit close together across Cromer, and that combination matters for how a barrier is planned. The Arcus Tributary runs across Cromer Golf Club's fairways into Narrabeen Lagoon, keeping the ground damp along that side of the suburb, while Dee Why West Recreation Reserve, bushland between Cromer Heights and Wakehurst Parkway, brings established bush close to homes on the western side. A rebuild replacing a post-war house often means dealing with decades-old timber and garden beds that have been sitting against damp soil the whole time, which is exactly the setting subterranean termites favour. Getting the new barrier detailed before the pour matters more here than on a drier, higher block.
Reviewed by Ismail, founder · Northern Beaches coverage · Updated September 2026 · More Northern Beaches suburbs
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Local conditions
Three features of Cromer's setting shape how we detail a barrier there.
The Arcus Tributary runs through Cromer Golf Club into Narrabeen Lagoon, keeping ground moisture high along that edge of the suburb. Homes closer to the lagoon and creek line get the same full perimeter attention as any waterside block.
Dee Why West Recreation Reserve, between Cromer Heights and Wakehurst Parkway, is bushland used for walking and mountain biking that sits close to homes on that side of Cromer. Established termite activity in reserve timber can move from there into nearby gardens.
Many original Cromer homes still carry the termite protection standards of when they were built after the Second World War, which do not meet current requirements. A knockdown rebuild on one of these blocks is the point to bring the whole site up to AS 3660.1.
What we install here
Our Cromer work is mostly knockdown rebuilds of post-war houses, along with granny flats and the occasional duplex split, since the suburb was largely built out decades ago. Waffle pod and raft slabs are standard, with suspended floors on blocks closer to the golf club creek or the lagoon edge where ground moisture is higher. Every pipe penetration gets a collar ahead of the pour, and we check garden beds and slab edges against both the lagoon side and the bushland side of the suburb before finishing the installation.
Local knowledge
James Morgan Reserve, about 0.1 km from the suburb centre, and Pukara Place Reserve, about 0.7 km away, are the closest green pockets to many Cromer rebuild sites, with Pukara Place in particular being bushland where termite activity is established. Narrabeen Lagoon borders the suburb to the north-east, and the Arcus Tributary carries water from Cromer Golf Club's fairways into it, keeping that side of Cromer noticeably wetter underfoot than the streets closer to Dee Why West.
Northern Beaches Council certifies Cromer's new builds and rebuilds. Before it issues the Occupation Certificate, its certifier wants a durable notice fixed in the meter box and an installation certificate that lists products, protected zones and the installer. Because so many Cromer rebuilds replace post-war houses carrying older protection, our paperwork spells out clearly that the new barrier meets current AS 3660.1 standards rather than relying on whatever the original house had installed.
Cromer at a glance
| Suburb | Cromer, NSW 2099 |
|---|---|
| District | Northern Beaches |
| Distance from Sydney CBD | 15.7 km north-east |
| Certifying council | Northern Beaches 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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Cromer questions
Still unsure? Call and talk it through with a licensed technician.
+61 450 515 215Many post-war Cromer homes have some form of termite protection from when they were built, but it will not meet current AS 3660.1 requirements. A knockdown rebuild on one of these blocks needs a full new system installed and certified, regardless of what protection the old house had, and the durable notice in the meter box is updated to match the new installation.
Ground closer to the lagoon and the Arcus Tributary that runs through Cromer Golf Club tends to stay damper for longer, which suits subterranean termite activity. We treat blocks on that side of the suburb with the same full perimeter attention as any waterside site, rather than a minimum edge strip.
Dee Why West Recreation Reserve, between Cromer Heights and Wakehurst Parkway, can carry established termite activity in its bushland close to nearby streets. Blocks near that reserve get a full perimeter system, the same approach we take on any site backing onto significant bushland, and we check garden beds and fence lines closest to the reserve carefully.
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 Northern Beaches.
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.
