Inner South & City Fringe · AS 3660.1
Under-slab collars and perimeter systems installed to the builder's program for Alexandria 2015 infill sites, from the terrace streets near Sydney Park to the old factory land by Alexandria Technology Park.
Quick answer
Building work anywhere in inner Sydney, including Alexandria, sits inside a termite-prone zone, so a new dwelling or infill development needs a compliant system before the City of Sydney will release an Occupation Certificate. Installation happens to AS 3660.1, timed after the plumber's rough-in and ahead of the pour. On completion, paperwork for the meter box and a certificate for the certifier are both handed over.
Termite barriers in Alexandria
Alexandria is an inner southern suburb of the City of Sydney, about 4.7 km south of the CBD in postcode 2015. Once described as the largest industrial district in Australia, much of its old factory land now holds apartment developments, offices and showrooms, while pockets of older terraces and cottages remain in the residential streets. That mix means two kinds of new termite work: infill apartment and townhouse slabs on former industrial sites, and rebuilds or rear additions on the narrower terrace blocks near Sydney Park and the Green Square, Erskineville and St Peters stations.
A converted warehouse site and a rebuilt terrace need the barrier detailed differently. On the old industrial land, a single large slab can carry dozens of penetrations for services and lift cores, so collar counts and sequencing drive the visit. On the terrace streets, party walls and shallow sub-floors mean a new slab section has to tie cleanly into an existing structure without leaving a gap at the join. Either way, the protection has to go in while the concrete is still open, because it cannot be added properly afterwards.
Reviewed by Ismail, founder · Inner South & City Fringe coverage · Updated September 2026 · More Inner South & City Fringe suburbs
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Local conditions
Three things shape how a termite barrier is planned for an Alexandria site.
Old factory and warehouse sites around Alexandria Technology Park are being rebuilt as apartments and mixed-use buildings, often on a single large slab with many service penetrations. We plan collar counts and installation sequencing against the wider construction program on jobs like these.
Terrace and cottage rebuilds share party walls with neighbouring buildings, so a new slab section has to be detailed carefully at the join to avoid leaving a gap a colony could use. Shallow sub-floors on these blocks need the same attention as the slab edge.
Cafes, food retail and constant nearby construction disturb ground conditions and can push termite activity toward the nearest untreated timber. New slabs close to these zones get the same full perimeter treatment as any other Sydney build, regardless of the surrounding land use.
What we install here
Our Alexandria work covers new apartment and townhouse slabs on redeveloped industrial land, terrace rebuilds and rear extensions, and the occasional light commercial fit-out slab. Waffle pod, raft and engineered slab types all appear here depending on the site's history and any contamination or fill conditions from its industrial past. We quote once from the plans for the whole job and attend in stages, so the barrier visit sits neatly between the plumber's rough-in and the pour without holding up the program.
Local knowledge
Work near Alexandria Technology Park and Park Sydney Village tends to be larger apartment or mixed-use slabs, where the scale of the pour is the main factor in scheduling. Closer to Sydney Park and the terrace streets around St Peters station, jobs are usually smaller rebuild or extension slabs tying into an existing party-wall structure. Either way, we plan the visit around the rest of the construction program so the barrier never becomes the item holding up the pour.
Certification in Alexandria runs through the City of Sydney, which will not release an Occupation Certificate until two documents are on file: a durable notice fixed inside the meter box, and an installation certificate covering the products, the protected areas and the installer's details. On former industrial sites we also record any relevant ground conditions in our paperwork, and everything is handed to you or your builder ready for lodgement.
Alexandria at a glance
| Suburb | Alexandria, NSW 2015 |
|---|---|
| District | Inner South & City Fringe |
| Distance from Sydney CBD | 4.7 km south |
| Certifying council | Sydney CBD 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
Google reviews
Real, verified reviews from homeowners and businesses we've worked with.
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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Alexandria questions
Still unsure? Call and talk it through with a licensed technician.
+61 450 515 215Yes. The NCC termite management requirement applies to new residential buildings regardless of what previously stood on the site. A large apartment slab on former factory land in Alexandria usually carries more service penetrations than a house, and our scheduling is built around that whole pour rather than treated as a series of small individual jobs.
Yes. Terrace rebuilds near Sydney Park are common, and the new slab section has to tie into the party wall and any remaining original structure without leaving a gap at the join. We detail that junction carefully, because it is the point most likely to be missed on a partial rebuild.
Yes, any new slab area needs its own compliant system, extensions included, regardless of what protection the original dwelling already carries. We time our visit to your plumber's rough-in for the new work so collars go on before that section is poured, then tie the new perimeter into the existing protection wherever the site detailing allows for it.
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 South & City Fringe.
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.
