--- title: "Drain Rat-Proofing Bournemouth | Stop Rats Entering Through Drains | JD Drainage" description: "Stop rats entering your home or business through the drainage system. CCTV survey, non-return valves & sealed repairs across Bournemouth, Dorset & Hampshire. 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[Home](/) 2. [Services](/services) 3. Drain Rat-Proofing JD Drainage Solutions # Stop Rats Entering Through Your Drains for Good — With CCTV-Verified Rat-Proofing Pest controllers kill the rats you can see. We seal the route the next one takes. Permanent drainage rat-proofing using CCTV survey, non-return valves and sealed repairs — guaranteed. [Get a Free Quote](/contact)[03303 330401](tel:03303330401) 5/5 from 60 reviews All work guaranteed Same-day response 25+ Years of Experience 60×5★ Reviews ✓ CCTV Verified ✓ Fully Insured 100% Guaranteed Workmanship ## Why Rats Get In Through Your Drains Brown rats are exceptional swimmers and habitual climbers. The sewer network is the rat's motorway — warm, hidden, food-rich, and connected to every property on the street. Whenever there is a defect in your private drainage that connects to the sewer, you have an open door into the building. The most common entry points are: a disused toilet branch left unsealed, a broken or displaced gulley trap, a cracked drain run under the property, a redundant rainwater pipe that was never properly capped, and damaged inspection chamber benching that gives rats a dry route up out of the flow. Killing the rats inside the property only solves the symptom. Unless the entry route is found and sealed, more rats will follow — often within days. Permanent drainage rat-proofing is the only fix that stops the cycle, and it pays for itself in avoided pest control call-outs within a single year on most infested properties. ## What Rats in the Drains Are Actually Doing to Your Property Rats gnaw constantly because their incisors never stop growing. In your drainage system that means damaged seals, chewed plastic pipe collars, and chewed cable insulation where service runs cross drainage trenches. The damage is invisible until the drain fails or the electrics short. A rat in the drainage system carries Weil's disease (leptospirosis), salmonella and hantavirus into every part of the building it accesses. Food preparation areas, baby changing facilities, schools and care homes have specific regulatory exposure under the Food Safety Act and Health and Safety at Work Act if a rodent route is identified and not promptly closed. Buyers' surveyors are now actively looking for rodent activity during pre-purchase inspections. A confirmed rat issue in the drainage system can knock 5–10% off the agreed sale price or collapse the transaction entirely. Sellers who can produce a [CCTV survey](/services/cctv-drain-surveys) and rat-proofing certificate are in a dramatically stronger negotiating position. ## Our Rat-Proofing Process 1 ### Initial Consultation We confirm symptoms — noises, sightings, droppings — and map the property's drainage layout so we know where to look. 2 ### CCTV Drain Survey Full [CCTV survey](/services/cctv-drain-surveys) of the foul and surface water drains identifies every defect a rat could use: open branches, cracks, displaced joints and damaged benching. Footage and a written report are provided. 3 ### Identify Entry Routes Each defect is scored for rat-access risk. We give you a prioritised list — what must be fixed now, what can wait, and what can be monitored. 4 ### Seal & Install Defences Open branches are capped, broken pipework is replaced or relined, and non-return rat-blocker valves are installed where appropriate to physically prevent rats moving upstream from the sewer. 5 ### Verification Survey After repairs are complete we re-survey with CCTV and issue a rat-proofing certificate showing every defect closed. This is the document buyers' solicitors and environmental health officers want to see. ## Why Choose Us for Rat-Proofing ### CCTV-Verified Every Time Before, during and after footage so you can see exactly what was found and what was fixed. No 'trust us' invoices. ### Non-Return Valve Installation We supply and fit Rat Blocker, RatWall and Rat Flap valves — the industry-standard physical barriers used by water authorities. ### Permanent Fix Pest controllers come back every month. Properly sealed drains stop the route once. The rats stop arriving. ### Rat-Proofing Certificate Written certificate with CCTV evidence — invaluable for conveyancing, environmental health and insurance records. ### Coordinate with Pest Controllers We work alongside your pest control contractor. They handle the rats inside; we handle the route they took to get there. ### 12-Month Guarantee Workmanship guarantee on all rat-proofing work. If a sealed defect fails within 12 months we return and fix it free. ## How Rat-Proofing Works at Each Common Entry Point Disused toilet branches are the single most common entry route into older properties. When a bathroom is moved or removed, the toilet branch is often capped at floor level with a temporary stopper that perishes within a few years. Permanent sealing requires excavating to the branch connection and either capping at the main run with a bonded fitting or cutting and re-jointing the main pipe to remove the branch entirely. Broken gulley traps under kitchen and bathroom waste pipes let rats climb out of the trap into the air gap below the pipe. The fix is to replace the broken trap (typically a £180–£280 job) or install a sealed wastewater hub that maintains the trap function without the vulnerable open-top design. Cracks and displaced joints in the main drain run under the property are found by CCTV and repaired by patch lining, full relining or [excavation](/services/excavations-new-drains) depending on severity and accessibility. Relining is normally preferred for rat-proofing because it creates a continuous new pipe surface with no joints for rats to exploit. Non-return valves (commonly Rat Blocker, Rat Flap or RatWall) install inside the inspection chamber at the property boundary. They allow normal outflow into the sewer but physically block any rat attempting to swim upstream from the main sewer back toward the property. They are the same technology used by water authorities to protect schools, hospitals and food premises and carry a 10-year+ service life with annual inspection. Damaged inspection chamber benching gives rats a dry resting platform above the flow line. Even with all other defects sealed, exposed benching inside the chamber acts as a staging point for any rat that does access the system. Reforming benching with waterproof mortar to the correct U-profile removes that platform and forces any rat that does enter to remain in the active flow — where they don't stay long. Where a property has had a confirmed rat issue we strongly recommend annual CCTV monitoring of the foul system for at least 3 years post-treatment. Most repeat infestations are caused by a defect that develops after the initial proofing — annual monitoring catches it before it becomes a route. ## Frequently Asked Questions How do I know if rats are coming in through the drains? How much does drain rat-proofing cost? Do non-return valves cause drainage problems? Will my pest controller still be needed? Do I get documentation for my insurer or buyer? How long does rat-proofing take? ### Related Services - [CCTV Drain Surveys](/services/cctv-drain-surveys) - [Drain Re-Lining](/services/drain-relining) - [Drain Odour Investigation](/services/drain-odour-investigation) - [Excavations & New Drains](/services/excavations-new-drains) ### Service Areas - [Bournemouth](/areas/bournemouth) - [Poole](/areas/poole) - [Christchurch](/areas/christchurch) - [Dorchester](/areas/dorchester) - [Weymouth](/areas/weymouth) - [Wimborne](/areas/wimborne) - [Wareham](/areas/wareham) - [Dorset](/areas/dorset) - [Swanage](/areas/swanage) - [Bridport](/areas/bridport) ## Ready to Solve Your Drainage Problem? No call-out fees. No hidden charges. Speak to our team today and get a free, no-obligation estimate. [Request a Free Estimate](/contact)[03303 330401](tel:03303330401) [JD Drainage ](/) Professional [drainage services](/services) across the South of England. 25 years of experience. No call-out charge. All work guaranteed. Read our [customer reviews](/reviews). 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