Upper North Shore · AS 3660.1
A pre-construction termite system sized to Wahroonga's big blocks, whether you're rebuilding on a tree-lined Federation street near the village or backing straight onto the Blue Gum High Forest remnants.
Quick answer
Yes. Forest remnants and creek lines put Wahroonga inside a termite-prone stretch of the Upper North Shore, so the NCC requires every new home to have a termite management system before the Occupation Certificate is issued. That system is installed to AS 3660.1, with collar and perimeter work completed before the concrete pour and the certificate handed to your certifier.
Termite barriers in Wahroonga
Wahroonga lies mostly in Ku-ring-gai Council, with a portion in Hornsby Shire, about 19 km north-west of the Sydney CBD in postcode 2076. Tree-lined streets and large gardens give the suburb its character, with Federation and Arts and Crafts homes and heritage houses including the modernist Rose Seidler House standing among more recent builds. Most of our work here is knockdown rebuilds on generous, established blocks, plus granny flats and outbuildings on properties with room to spare, since larger lots and more roof space are the norm rather than the exception.
Remnants of Blue Gum High Forest and the upper Lane Cove River run through Wahroonga, and that combination of high tree cover and creek lines keeps gardens and sub-floors damp for longer than most Sydney suburbs. Large old gardens with decades of plantings are exactly what termites, and the rats and possums that follow them, look for. A rebuild on one of these blocks usually means clearing a mature garden with buried stumps and old timber, so soil treatment and a continuous perimeter matter as much as sealing the new slab edge itself.
Reviewed by Ismail, founder · Upper North Shore coverage · Updated September 2026 · More Upper North Shore suburbs
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Local conditions
Three things push termite pressure higher on a Wahroonga block than on a newer, more open suburb.
Remnants of Blue Gum High Forest sit within Wahroonga, and the fallen timber and leaf litter inside them have supported termite colonies for a long time. Blocks near these remnants or the upper Lane Cove River get a full perimeter system, with extra care at any junction between garden beds and the bush edge.
Wahroonga's generous blocks often carry a century of garden beds, mature trees and buried timber from earlier plantings. That kind of material can be sustaining a colony well before a rebuild's new slab is poured, which is why soil treatment gets as much attention as the perimeter edge on these bigger, older properties.
Big Federation and brick homes on generous blocks mean more sub-floor and roof void to check than on a standard suburban lot. We take the extra time these properties need, since a gap missed in a larger roof space or sub-floor is just as much an entry point as one on a smaller home.
What we install here
Wahroonga work for us leans toward knockdown rebuilds, new homes on subdivided blocks and granny flats or outbuildings on the larger properties, with the occasional duplex closer to the village. Most sites take a standard raft or waffle pod slab, though we'll switch to piers and a suspended floor if the block drops away toward forest remnants or the creek line. One figure covers the whole job, and the barrier visit is timed to your pour rather than a date of our own choosing.
Local knowledge
Much of our Wahroonga work sits near Wahroonga station and the Hampden Avenue shops, where rebuild blocks back onto remnants of Blue Gum High Forest that hold established termite activity. Around Collingridge Reserve, bushland on the suburb's western side, we spend extra time on the perimeter and on fence lines facing the bush. Closer to the Sydney Adventist Hospital and Fox Valley shops, sites tend to be smaller renovations rather than full rebuilds.
Most Wahroonga builds sit under Ku-ring-gai Council, with a slice of the suburb falling under Hornsby Shire instead, though the certification requirements don't change either way. A notice stays fixed inside the meter box recording the termite system, and alongside it an installation certificate confirms the installer, the products used and exactly which areas are covered. We put the full set together with the relevant data sheets ahead of your final inspection.
Wahroonga at a glance
| Suburb | Wahroonga, NSW 2076 |
|---|---|
| District | Upper North Shore |
| Distance from Sydney CBD | 19.0 km north-west |
| Certifying council | Hornsby Shire |
| 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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Wahroonga questions
Still unsure? Call and talk it through with a licensed technician.
+61 450 515 215Given how many Wahroonga jobs involve clearing an established garden first, it pays to talk to us while the demolition and landscaping plan is still being worked out, not just once a slab date exists. From there we fall in behind the plumber's rough-in and finish the perimeter ahead of the pour, whatever your builder's program ends up looking like.
The forest remnants here hold colonies that have likely been established for decades, so treating only the house footprint and ignoring the garden isn't enough. We extend coverage the full length of any boundary that meets bushland and pay particular attention to where retaining walls step down toward the reserve, since that's a common weak point.
Regularly, since the larger blocks here suit a second dwelling well. The smaller structure gets full collar coverage and its own certificate regardless of size, and if the main house was treated at some point in the past, we check what's already there before deciding how the two systems should connect.
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 Upper North Shore.
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.
