Northern Beaches · AS 3660.1
From the apartment blocks along Pittwater Road to the streets backing Dee Why Lagoon, postcode 2099 infill sites get collars, membrane and perimeter protection built to AS 3660.1.
Quick answer
Dee Why counts as termite-prone Northern Beaches territory, so yes, any new house, townhouse or apartment block built there has to carry a termite management system that meets the National Construction Code. Collars are fitted at every plumbing penetration and the barrier goes in before the concrete pour, and once finished, your certifier receives an installation certificate, matched with a durable notice fixed in the meter box, ahead of occupation.
Termite barriers in Dee Why
Dee Why is the administrative centre of Northern Beaches Council, home to the Warringah Civic Centre that opened in 1973, in postcode 2099 about 14.5 km north-east of the CBD. Unlike much of the Northern Beaches, most residents here live in apartments rather than houses, with Pittwater Road as the commercial spine running past several shopping centres, cafes and restaurants. Because established housing already covers most of the suburb, new work tends to be townhouse and apartment redevelopment along the main roads, duplex splits and granny flats on the remaining house blocks, and boutique infill closer to the beach and the lagoon. Every one of those needs a termite management system before it can be occupied.
Water shapes Dee Why from two directions. Dee Why Lagoon, a 30 hectare wildlife refuge proclaimed in 1973, and the 1.2 km surf beach both keep the sandy ground near the coast damp, while Stony Range Botanic Garden, planted on an old quarry site from 1957, adds another pocket of established vegetation inland. That coastal moisture reaches well back from the shoreline into the surrounding streets, and on multi-unit sites a single slab can carry dozens of pipe penetrations, so getting every collar and every membrane join right before the pour matters more here than on a simple house block.
Reviewed by Ismail, founder · Northern Beaches coverage · Updated September 2026 · More Northern Beaches suburbs
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Local conditions
Three things drive how a Dee Why termite barrier gets built, and density is as much a factor as the coastline.
Dee Why Lagoon and the surf beach keep the sandy coastal ground consistently damp, and that moisture travels well back into the surrounding streets. New slabs near the shoreline get the full perimeter treatment, with drainage falls checked carefully so water is not left pooling against the barrier.
With most residents in apartments, a lot of our work is one slab carrying dozens of plumbing penetrations for a townhouse or unit block. Collar counts, not perimeter length, drive the schedule on these jobs, and every penetration has to be checked off before the pour.
Stony Range Botanic Garden, grown on a former quarry site since 1957, and other green pockets away from the coast hold established plantings that can support termite activity working toward nearby blocks. Infill sites near these pockets still get the same full perimeter as any other new build.
What we install here
Dee Why work is a mix of townhouse and apartment redevelopment along Pittwater Road, duplex splits and granny flats on the suburb's remaining house blocks, and boutique infill closer to the lagoon and the beach. Multi-unit slabs typically carry a high number of penetrations, so we schedule collar and membrane work around the plumber's full rough-in rather than a single visit. Waffle pod and raft slabs are standard, and we provide one fixed quote from the plans covering every stage, so the barrier keeps pace with a busy Dee Why build program.
Local knowledge
Dee Why Grand Shopping Centre and Mooramba Park sit within a couple of hundred metres of most central addresses, and infill or redevelopment sites near them tend to be smaller, higher-density jobs where access through a built-up block matters as much as the barrier itself. Toward Dee Why Beach and the lagoon, about 1.4 km from the centre, new work sits closer to consistently damp coastal ground, and those sites get the fuller perimeter treatment. Long Reef Golf Course and Pukara Place Reserve mark the edges of the wider area we work across.
Certification in Dee Why runs through Northern Beaches Council, headquartered locally at the Warringah Civic Centre. Their checklist ahead of the Occupation Certificate has two items: a durable notice inside the meter box, and an installation certificate covering the products used, the areas covered and who carried out the work under licence. On multi-unit Dee Why sites we break the certificate down by level and penetration count, which keeps strata certifiers satisfied first time.
Dee Why at a glance
| Suburb | Dee Why, NSW 2099 |
|---|---|
| District | Northern Beaches |
| Distance from Sydney CBD | 14.5 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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Dee Why questions
Still unsure? Call and talk it through with a licensed technician.
+61 450 515 215Yes. Density does not change the requirement: a townhouse or apartment block needs the same termite management system as a standalone house, just applied across a bigger footprint. On these sites the main difference is scale, since one slab can carry dozens of pipe penetrations, and every single one gets its own collar logged against the installation certificate.
The closer a block sits to the lagoon or the beach, the more consistently damp the surrounding soil tends to be, so we generally recommend physical and chemical protection running the full length of the perimeter, not a partial strip. We also check that stormwater and site drainage are not directing extra water against the barrier line, which is a common issue this close to the coast.
Yes. Each half of a duplex counts as its own dwelling, so the barrier is scaled and detailed to that half's footprint rather than shared across the pair, with its own durable notice and certificate once the work is done. Where the original house had any protection, we check it before starting so the new work is not simply built on top of an unknown system.
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.
