Inner West · AS 3660.1
Under-slab and perimeter termite systems installed to AS 3660.1 for knockdown rebuilds and secondary dwellings across Lewisham's heritage streets, from the Lewisham Estate conservation area down to Long Cove Creek.
Quick answer
Yes. A new home, granny flat or knockdown rebuild in Lewisham still needs a termite management system, because the NCC requires one wherever the site is termite-prone, regardless of the suburb's heritage character. The system is installed to AS 3660.1, with collars and any under-slab work going in before the pour. A durable notice and installation certificate then go to your certifier ahead of the Occupation Certificate.
Termite barriers in Lewisham
Lewisham is a small Inner West Council suburb about 7 km south-west of the CBD, in postcode 2049, and much of it lies inside the Lewisham Estate Heritage Conservation Area. That heritage status keeps a high proportion of older houses on their original footprint, so the work we see most is knockdown rebuilds behind a retained facade, secondary dwellings tucked into narrow rear yards, and the occasional infill townhouse near Lewisham and Lewisham West stations. Long Cove Creek runs along the suburb's western side, crossed by heritage railway viaducts, and the Inner West Light Rail cuts through on a former goods corridor. Any new slab going down here, whatever its size, still needs a compliant termite system before it can be signed off.
Long Cove Creek keeps the soil damp along Lewisham's western edge, and damp ground close to a slab is exactly what subterranean termites look for when they forage from timber viaducts, old fence lines and neighbouring sub-floors. Heritage houses nearby often still have timber sub-floors and old roof framing that has carried termite activity for years without anyone noticing, so a rebuild next door to one of these properties is not starting with a clean slate. On a conservation area block, retaining walls, party walls and tight setbacks also mean the slab edge is rarely a simple straight run, and every step or return is a place a barrier can be missed if it is not planned before the concrete goes down.
Reviewed by Ismail, founder · Inner West coverage · Updated September 2026 · More Inner West suburbs
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Local conditions
Three local conditions shape how we detail a Lewisham barrier, more than any standard checklist would.
Long Cove Creek keeps soil damp through the streets closest to the water, and subterranean termites favour that moisture when they forage toward a new slab. Blocks near the creek and the old railway viaducts get a full perimeter system rather than a minimal strip.
Lewisham Estate's conservation status means most rebuild sites sit beside decades-old houses with timber sub-floors and roof framing that can carry established termite activity. That neighbouring pressure is treated as a given on every knockdown rebuild we quote here, not an afterthought.
Narrow rear yards, party walls and retaining on conservation-area blocks mean the slab perimeter is rarely a straight line. Every return, step-down and boundary wall junction is drawn and priced before we start, because those junctions are where a rushed barrier leaves a gap.
What we install here
We work on Lewisham knockdown rebuilds behind retained facades, granny flats in narrow rear yards, and the occasional townhouse or infill unit site near the stations. Waffle pod and raft slabs are common on rebuild blocks, with strip footings and suspended sections where an older sub-floor is being tied into new work. We attend after the plumber's rough-in for collars and any under-slab system, and again at the perimeter stage, all from one fixed quote taken off your plans so a barrier visit never holds up the pour.
Local knowledge
Most of our Lewisham work is within a few streets of Long Cove Creek and the heritage railway viaducts that cross it, where damp ground gets extra attention at the barrier. Harvest Park and the light rail corridor through Lewisham West and Taverners Hill also come up often, since rebuild sites backing onto that greenery or the rail cutting need careful detailing at the boundary. Closer to Fanny Durack Aquatic Centre, newer builds are more often townhouse or unit stages sharing one slab.
Lewisham is entirely within the Inner West Council area, which certifies new homes, secondary dwellings and rebuilds across the suburb, including sites inside the Lewisham Estate Heritage Conservation Area. Before the Occupation Certificate can be issued, the certifier needs a durable notice fixed in the meter box and an installation certificate that names the products used, the areas protected and the installer's licence. We provide both, together with maintenance advice, as soon as the barrier work is finished.
Lewisham at a glance
| Suburb | Lewisham, NSW 2049 |
|---|---|
| District | Inner West |
| Distance from Sydney CBD | 6.7 km south-west |
| Certifying council | Inner West 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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Lewisham questions
Still unsure? Call and talk it through with a licensed technician.
+61 450 515 215The heritage conservation area controls what the building looks like, not the termite system underneath it. A new home, rebuild or granny flat still needs collars, under-slab work and a perimeter installed to AS 3660.1, and we detail around any retained facade or party wall the same way we would on any other tight infill block.
Yes. Established termite activity next door is common in this part of Lewisham, so we treat a shared boundary with an old timber sub-floor as active pressure rather than a formality. Expect a full perimeter system rather than a minimal strip, and ask us to check the neighbouring wall line during the quote.
After the plumber has roughed in the drainage and before the slab is poured, since that is when collars and any under-slab membrane go in. On a narrow Lewisham block we also plan the perimeter stage around scaffolding and site access, so let us know your access constraints early. Reach out early so we can lock in a suitable date.
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 Inner West.
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.
