A Sea Point apartment owner completed a full kitchen renovation and within 6 weeks had roof rats in the ceiling. The renovation had created 5 new structural entry points — open conduit penetrations, a disconnected extraction duct, and a gap at the new kickplate. All 5 were identified and sealed. Exclusion cleared the infestation in 4 weeks with a 6-month guarantee.
The apartment owner had no pest history before the kitchen renovation. Within 6 weeks of the builder's completion, scratching in the ceiling began. The renovation had created 5 new structural openings: 3 open conduit penetrations through the kitchen wall (where new wiring and water supply lines had been installed), an extraction duct disconnected from its wall bracket during tile replacement (leaving a gap between duct and structure), and an open kickplate cavity under the new base cabinets where the plinth seal had not been fitted.
Full structural survey identifying all 5 renovation-created entry points. Gaps sealed with appropriate materials: galvanised mesh + exterior-grade filler for conduit penetrations, duct bracket reseated and sealed at the structural interface, kickplate gap sealed with purpose-made trim. Tamper-proof bait stations installed at 2 external positions. 4-week clearance confirmed. Inspection report provided to owner for the builder who had left the penetrations unsealed.
Owner called after 3 nights of ceiling scratching, concentrated above the kitchen. Unusual detail: the apartment had no prior rodent history in 7 years of occupancy. New infestation in a property with no previous activity strongly indicated a structural event creating new access — a renovation, a structural change, or a maintenance failure — rather than a gradual population increase from existing nearby pressure.
Inspection began with a review of the renovation scope. Kitchen remodel: new cabinetry, all tiling replaced, new electrical (3 new circuits), new plumbing (new sink run and dishwasher supply), new extraction system. Each of these creates structural penetrations. Survey of the kitchen walls found: 3 conduit entry points where the builder had run cables and pipe through the kitchen wall — all 3 left with a gap around the conduit (foam packing had not been fitted); extraction duct where the wall bracket had been removed to allow tile work and not reseated at the duct-to-structure interface, leaving a 25mm gap; kickplate cavity under the new base cabinets where the plinth trim had been ordered but not yet received by the owner. All 5 openings were active ingress routes.
Roof void accessed through inspection hatch. Active infestation confirmed: fresh droppings, a small nest of shredded paper material near the kitchen area ceiling, and grease marks on a ceiling joist indicating a regular route. Infestation was localised to the kitchen zone — consistent with recent ingress through the kitchen wall rather than a building-wide or roof-level entry.
All 5 entry points closed: conduit penetrations packed with steel wool and sealed with exterior-grade filler; extraction duct bracket reseated, duct aligned, structural gap sealed with appropriate flexible sealant at the duct-to-tile interface; kickplate cavity sealed with purpose-made aluminium plinth trim (owner had the trim on order — Verminator fitted it). Photographs taken of all 5 points before and after sealing, for the owner's records. Report prepared documenting each unsealed penetration as a builder defect.
Two tamper-proof bait stations installed at external building perimeter positions: one at the base of the building near the kitchen window wall (the likely external approach route for rats reaching the kitchen), one at the rear lane position used by building maintenance. Stations secured to the exterior structure. No open bait used inside the apartment.
Owner reported no ceiling activity for 2 weeks. Bait station check: active uptake in the first 2 weeks, stations empty by week 3. Ceiling void re-inspection: no fresh droppings, no fresh grease marks, nest material old and dry. All exclusion points confirmed intact. Population cleared. 6-month guarantee issued. Owner provided the before/after exclusion report for the builder defect claim.
The apartment had no pest history. Then the kitchen was renovated. Six weeks later: rats in the ceiling. This is not coincidence — it is the standard pattern of post-renovation rodent ingress, and it occurs because builders create structural openings that they are not specifically trained to seal against pest access. The exclusion approach that resolves it is identical to any other rodent case; the distinctive element is the diagnostic step of connecting the pest problem to the building event that caused it.
Every kitchen renovation creates structural penetrations. New electrical circuits mean conduit through walls. New plumbing means pipe penetrations. New extraction systems mean connections to the ceiling void. Tiling work means interfaces disturbed and reset. Each of these creates an opportunity for an unsealed gap — and in a building with roof rat pressure, those gaps are found quickly.
The Sea Point apartment had been pest-free for 7 years. No prior treatment, no complaints, no activity. This history was the first clue: new infestations in previously-clean properties almost always trace to a structural change. Random infestation from external pressure tends to develop gradually, not appear suddenly 6 weeks after a specific event. The renovation scope was the obvious starting point for the survey.
The three conduit penetrations were the simplest finding: cable and pipe run through the kitchen wall, gap around each conduit, no sealing material applied. Builder standard practice — leaving the gap sealed is usually a finisher's task that gets deprioritised when a job is running to deadline. The extraction duct was more significant: the bracket had been removed to allow full tile coverage behind the duct, which is correct building practice, but the duct had not been properly reseated and sealed at the wall interface when the tile work was complete. A 25mm gap at the duct-to-tile junction was open into the ceiling void. This was the most likely primary entry route given its size and direct ceiling access.
The kickplate gap was the detail that established how quickly the rats had found the openings: fresh gnaw marks on the inner face of the cabinet base where a rat had apparently explored the cavity from inside. The kickplate trim had been ordered and was on its way — it simply had not arrived when the builder finished the job.
One practical outcome of the inspection was the before/after photographic report of the 5 unsealed penetrations. The owner had a defect dispute with the contractor about other finishing items; the unsealed conduit penetrations were added to the list with documented evidence. This is an increasingly common use of post-renovation pest inspections: independent documentation of workmanship deficiencies that created a pest access risk, for use in contractor discussions or building warranty claims.
The simplest prevention is an inspection after any renovation that involves wall penetrations, ceiling void access, or extraction system work — before occupying the renovated space. A 30-minute walk-through to confirm all penetrations are sealed, all structural interfaces are complete, and no new gaps have been created is a small investment against a problem that typically manifests 4–8 weeks after the builder leaves. For properties in high-pressure areas like Sea Point, Green Point, or Camps Bay, the external rodent pressure guarantees that open gaps will be found.
Related: Rodent Exclusion — Newlands Home | Rodent Treatment | Pest Inspection Cape Town
