Northern Beaches · AS 3660.1
Collars, membrane and a perimeter system installed to AS 3660.1 for Narraweena knockdown rebuilds and extensions in the hills behind Dee Why, from Parr Park to the South Creek Reserve gully.
Quick answer
Yes, a rebuild or new structure in Narraweena needs a termite management system. The suburb is a termite-prone part of Northern Beaches Council, so the National Construction Code requires a compliant system to AS 3660.1. Collars go in before the slab is poured, and once the work is finished we prepare the installation certificate and durable notice your certifier needs to close out the Occupation Certificate.
Termite barriers in Narraweena
Narraweena is a quiet residential suburb in the hills behind Dee Why, about 14.4 km north of the Sydney CBD in postcode 2099, within the Northern Beaches Council area. The land was subdivided after the Second World War and the local post office opened in 1953, so most housing dates from the post-war decades, mixed with later rebuilds and extensions, and the suburb has a long-established Italian community that holds an annual festival. Knockdown rebuilds and additions on that original stock make up most of the new construction here today.
Post-war brick and fibro homes on timber-framed floors have usually been extended more than once over seventy-plus years, and the join between the original structure and a later addition is a common weak point where termites get in unseen. The hilly streets running down toward South Creek also carry gullies and pockets of reserve, and gardens with vegetable beds, fruit trees and chook pens are common on the older blocks here. Clearing a site for a rebuild does not remove any of that history, so the soil around the new footprint needs checking as closely as the slab edge itself.
Reviewed by Ismail, founder · Northern Beaches coverage · Updated September 2026 · More Northern Beaches suburbs
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Local conditions
Three local conditions shape how we plan a termite barrier for a Narraweena rebuild.
South Creek Reserve and similar gullies cut through Narraweena's hilly streets, holding damp soil and fallen timber that termites favour. Blocks near a gully generally need a fuller perimeter than one on flatter ground further from the creek line.
Many Narraweena houses have been extended well beyond their original post-war footprint, and the join where newer work meets the original brick or fibro structure is a common spot for termites to get in unseen. We check that history on any rebuild.
Established blocks here often carry fruit trees, vegetable beds and chook pens, and fallen fruit or old timber offcuts left in the yard can draw termites toward the house. The whole yard gets factored into the barrier plan, not just the footprint.
What we install here
We install perimeter and under-slab termite systems for Narraweena knockdown rebuilds, extensions and granny flats, with particular attention to where new work joins an existing structure and to yards close to a creek gully or reserve. Waffle pod and raft slabs are typical on the flatter blocks, with piers where the ground steps down toward a gully. One fixed quote from the plans covers collars, membrane and perimeter across every stage, timed to your builder's own program.
Local knowledge
Parr Park sits close to much of Narraweena and, like the reserves nearby, holds leaf litter that termites and other pests shelter in near houses. South Creek Reserve follows a bush gully through the hills, where damp soil and fallen timber bring termite activity close to backyards on that side of the suburb. Toward Dee Why Grand Shopping Centre, blocks sit a little further from direct bushland exposure but stay on the same hilly, post-war streets.
Narraweena falls under Northern Beaches Council for certification, and before it releases the Occupation Certificate the certifier wants confirmation the termite system meets the NCC. We put together an installation certificate covering the products used, the treated areas and our licence, and mount a durable notice inside the meter box once the barrier is in, so both are ready the moment your build reaches sign-off.
Narraweena at a glance
| Suburb | Narraweena, NSW 2099 |
|---|---|
| District | Northern Beaches |
| Distance from Sydney CBD | 14.4 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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Narraweena questions
Still unsure? Call and talk it through with a licensed technician.
+61 450 515 215Usually, yes. Gullies like the one South Creek Reserve follows hold damp soil and fallen timber that established termite colonies favour, so a block near the reserve generally gets a fuller perimeter rather than a minimal strip, with extra attention to the side of the property facing the gully and any drainage running toward it.
Yes. The join where a later addition meets the original post-war structure is a common spot for termites to get in unseen, so we look at that construction history as part of the quote. On a full rebuild we treat the whole new footprint, including any section that reused part of the old slab.
It changes what we look at in the yard rather than the products used. Fallen fruit and timber offcuts left near chook pens or garden beds can draw termites toward the house, so we walk the whole yard, not just the building footprint, before recommending how far the perimeter should run.
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.
