Rat baiting after the build in Officer.
New estates push the local rodent population around. The first houses on a street, the houses bordering ongoing construction, the houses near a recently filled retention basin - that is where we get the calls. We map the stations, choose the right bait for the surroundings, and close the program when the count hits zero.
Why a new build attracts rats.
When Cardinia Shire was a patchwork of grazing paddocks the local rat population - mostly roof rats (Rattus rattus) and a smaller share of Norway rats (Rattus norvegicus) - lived in a stable equilibrium with sheds, woodpiles and dam-edge cover. Twenty years of subdivision, retention-basin construction and slab pours have repeatedly displaced that population. The pattern is consistent: an existing colony is disturbed by earthworks at the new stage release, the colony relocates to the nearest stable shelter, and the nearest stable shelter is almost always one of the first-occupied houses on the adjacent street.
First six months - population shift.
On a typical Cardinia Lakes home that completed handover six months ago the rodent calls peak in months three to seven. Sightings in the roof void, scratching at night, droppings in the garage, gnawed irrigation drip-line. By the time the next stage of the estate is complete and the rear neighbours have moved in, the population has re-stabilised and the home will rarely need another rodent program for years. The job for us is to manage the displacement window cleanly.
Common entry points on new builds.
Slab-on-ground new builds in Officer, Cardinia Lakes and Heritage Springs share a small number of repeat entry points. The gap where the brick veneer meets the eaves above the garage door, unmeshed roof tile vents, the unsealed gap around the air-conditioner condenser line entering the wall, the dryer external vent without a backdraft flap, and the gap above the meter cupboard. Each is a 15-minute fix with mesh and silicone - we list them on a floor-plan sketch with every program.
How we place the stations.
Mapped, photographed, mapped again.
Every tamper-resistant station gets a photograph at placement and a position marker on the property plan. Three reasons: the homeowner knows exactly where the stations sit, a future technician can audit the program without re-walking the boundary, and if a station is moved by a gardener or a dog we know which one and where it should be. Numbered station labels reference a treatment register listing active ingredient, batch number and application date for compliance with DELWP record-keeping requirements.
Anchored, not loose.
Stations are anchored to a vertical surface where possible - a fence post, a brick pier, the side of an outbuilding. A loose station gets pushed around by dogs, possums and the wind, which tells the rats it is not a permanent feature of their territory and reduces feed-take. Anchored stations on the rat's existing travel-path get accepted into the territory within 48 hours.
External preferred over internal.
Where the infestation source is external we prefer to take the rats outside the building. Internal stations only go in for confirmed active roof-void or wall-cavity infestation, are placed out of sight in non-living spaces, and are flagged in writing to the homeowner so they are not surprised by them later.
Bait choice and the raptor question.
The default - second-generation anticoagulant.
Brodifacoum and bromadiolone are the dominant rodenticides in Australian commercial rodent control because they are highly effective in a single feed and rats do not learn to avoid them. For a typical suburban Officer infill where the surrounding biology is largely magpies and minor birds, the secondary exposure risk to native predators is low.
The rural-fringe choice.
For acreage in Officer South, Beaconsfield Upper, the bushland edge near the Cardinia Reservoir, or any property where the homeowner has observed boobook owls, kestrels or brown goshawks on the block, we strongly recommend first-generation anticoagulants (warfarin, coumatetralyl), cholecalciferol (vitamin D3) bait, or non-chemical alternatives. The cost of the program is slightly higher and the timeline can be a week or two longer, but the downstream risk to local raptors drops sharply.
Snap-traps and electronic options.
Professional snap-traps (Victor M326 Pro and the T-Rex range) inside tamper-resistant station bodies give an immediate kill with zero secondary exposure and zero environmental residue. The trade-off is labour - traps need checking every 48 to 72 hours during the active phase. Self-resetting CO2-driven units like the Goodnature A24 fit between the two and are ideal for rural-fringe Officer properties where bushland adjoins the back fence.
Book a rodent program.
Mapped station placement, raptor-safe options for bushland-edge properties, six-week typical resolution. Officer, Cardinia Lakes, Heritage Springs, Beaconsfield, Pakenham.