06/08/2026
This week we were called out to Radlett to carry out a drain survey for an ongoing rat issue, referred to us by another pest control company that doesn’t offer this service.
We’re always happy to support other pest control companies with specialist work like CCTV drain surveys. It’s all about working together to get the right result for the customer.
The customer had been dealing with rats gaining access through a cupboard at the side of the property, so we carried out a full inspection using our SEM approach — Source, Exclude & Restrict, Manage.
We identified four inspection chambers around the property:
• Chamber 1 – No issues found
• Chamber 2 – Large gap beneath the drainage pipe at the top of the chamber. This is scheduled for repair
• Chamber 3 – Ingress points found beneath the benching, which could allow rodents into the property. As a precaution, we installed a one-way valve and recommended repairs to the benching
• Chamber 4 – Possible collapse at the end of the drain line. This has been reported to the homeowner for further investigation
🔍 Source
We carried out a full CCTV drain survey to find exactly where the rats were entering the system, identifying defects including gaps, damaged benching, and a possible collapse.
🚫 Exclude & Restrict
Once the entry points were identified, we took immediate action to stop access. A one-way valve was installed to prevent rats travelling back up the drain and into the property. We also highlighted the structural repairs needed to fully block access.
📊 Manage
We advised the homeowner on the next steps to resolve the issue long-term, including completing the repairs and monitoring the system to ensure it remains secure.
Installing the one-way valve will prevent further rat entry via the damaged benching and, once repairs are completed, should lead to a rat-free property.