Northern Beaches · AS 3660.1
Perimeter and under-slab termite barriers installed to AS 3660.1 for homes on the sandstone slopes of Cottage Point, inside Ku-ring-gai Chase National Park, postcode 2084.
Quick answer
Cottage Point sits entirely inside Ku-ring-gai Chase National Park, in country the National Construction Code treats as heavily termite-prone, so any rebuild or new structure there needs a compliant termite management system, fitted to AS 3660.1 before the slab or floor is closed in. A durable notice and installation certificate are then prepared and given to the certifier ahead of the Occupation Certificate.
Termite barriers in Cottage Point
Cottage Point is one of the most secluded suburbs in Sydney, sitting entirely inside Ku-ring-gai Chase National Park where Cowan Creek meets Coal and Candle Creek, in postcode 2084 about 27.6 km north of the CBD and part of Northern Beaches Council. The only way in is Cottage Point Road, off Liberator General San Martin Drive, and the small community is known for the Cottage Point Inn, where seaplanes land on the water. Building work here is rare and almost always a rebuild or renovation of an existing house on a bushland block, rather than anything close to a new-estate development, given the surrounding national park leaves no land free to subdivide.
Every Cottage Point block sits on steep sandstone slopes under a canopy of native trees, with national park bushland running hard up against the property boundary on most sites. That closeness to established bushland means subterranean termite colonies are active in stumps, fallen timber and leaf litter right at the edge of the building envelope, and the tidal reach of Cowan Creek and Coal and Candle Creek keeps the lower parts of many blocks damp year-round. Waterfront jetties, boatsheds and decks stay wet for long periods, and a house that is not lived in full time can go a long stretch between anyone noticing a problem. A carefully detailed barrier, put in before the slab or a repaired section of flooring is closed up, is the only practical way to manage that pressure on a site like this.
Reviewed by Ismail, founder · Northern Beaches coverage · Updated September 2026 · More Northern Beaches suburbs
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Local conditions
Three things make Cottage Point one of the more demanding sites we detail a termite barrier for.
Ku-ring-gai Chase National Park surrounds the whole suburb, so established termite colonies in bushland timber and leaf litter sit right at the fence line on most blocks. Sites here get a full perimeter system, not a partial strip, because the pressure comes from every direction rather than one edge.
Building on Cottage Point's sandstone slopes usually means suspended floors, piers and retaining work rather than a simple slab on grade. Every pier, step-down and retaining junction is a place a barrier can be broken if it is not planned from the site's engineering before work starts.
Cowan Creek and Coal and Candle Creek keep the lower edge of many blocks damp, and jetties, boatsheds and decks near the water stay wet for long periods. That moisture is exactly what supports subterranean termite activity, so waterfront structures get the same attention as the house itself.
What we install here
Cottage Point work is almost always a rebuild, extension or renovation of an existing house, since the national park boundary leaves no room for new subdivision. Suspended floors, piers and retaining walls are the norm on the sandstone slopes, so barrier work is planned from the site's own engineering rather than a standard slab layout. Because many properties are not occupied full time, we schedule visits carefully and document everything clearly, so nothing is missed between inspections and the owner has a clear record of what was installed and where.
Local knowledge
Ku-ring-gai Chase National Park surrounds the entire suburb, and its bushland runs directly up to most property boundaries rather than sitting at a distance, which is the single biggest influence on how we detail a Cottage Point barrier. Little Shark Rock Point Beach marks the water's edge nearby. Cowan Creek and Coal and Candle Creek, which meet at Cottage Point, keep the lower parts of many blocks tidal and damp, and that combination of national park bushland and tidal water is what drives a full-perimeter approach on almost every site here.
Northern Beaches Council handles certification for Cottage Point. A rebuild or new structure cannot get its Occupation Certificate without two records of the termite work: a durable notice fitted inside the meter box, and an installation certificate detailing the products, protected areas and installer. Because so much of a Cottage Point property involves piers, decks or retaining close to the water, we log each protected zone precisely, so the paperwork matches what was actually built on site.
Cottage Point at a glance
| Suburb | Cottage Point, NSW 2084 |
|---|---|
| District | Northern Beaches |
| Distance from Sydney CBD | 27.6 km north |
| 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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Cottage Point questions
Still unsure? Call and talk it through with a licensed technician.
+61 450 515 215Because the whole suburb sits inside Ku-ring-gai Chase National Park, established termite colonies in bushland timber are active right at most property boundaries rather than at a distance. That means a full perimeter system is standard here rather than a partial edge strip, and waterfront structures like jetties and decks need the same attention as the house.
Any structure attached to or built off the house falls under the same AS 3660.1 requirements, and jetties, boatsheds and decks near Cowan Creek and Coal and Candle Creek stay damp for long periods, which suits termite activity. We treat these as part of the overall barrier plan rather than an afterthought.
We schedule the installation and any follow-up carefully and keep clear written records of what was installed and where, since gaps between visits to a part-time home can let a problem build up unnoticed. Regular inspections, at least every 12 months, matter even more here than on a fully occupied property.
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.
