Mice Infestation in London: Signs, Risks & Removal
House mice are extremely common in London properties. This guide covers everything you need to know about identifying and eliminating a mouse infestation.
The London Mouse Problem
House mice (Mus musculus) are one of the most common pests in London homes, particularly during autumn and winter when they seek warmth indoors. A single pair of mice can produce up to 60 offspring per year, meaning a small problem can become a major infestation within weeks.
Signs of a Mouse Infestation
- Droppings — small, dark, rice-shaped, 3–6mm long. Fresh droppings are soft and dark; older ones are hard and grey
- Gnaw marks — on food packaging, wood, and electrical cables (a serious fire risk)
- Nests — shredded paper, fabric, or insulation in quiet corners
- Scratching sounds — particularly at night inside walls and under floorboards
- Footprints — visible in dusty areas; mice leave a distinctive four-toed print
- Ammonia smell — strong urine odour in enclosed spaces
- Live or dead mice — seeing one mouse usually means many more are hidden
Health Risks
Mice contaminate food and surfaces with urine, droppings, and fur. They can spread:
- Salmonella — food poisoning from contaminated surfaces
- Hantavirus — serious respiratory illness from dried droppings
- Listeria — particularly dangerous for pregnant women
- Lymphocytic choriomeningitis (LCMV) — viral infection
How Mice Enter London Properties
Mice can squeeze through a gap of just 6mm — the width of a pencil. Common entry points include:
- Gaps around pipes under kitchen sinks
- Holes in cavity walls
- Gaps under doors (especially back doors)
- Air bricks and ventilation grilles
- Gaps around utility cables entering the building
Professional Mouse Control
Professional treatment is far more effective than DIY methods:
- Survey — identifying entry points, runs, and nesting areas
- Bait stations — tamper-resistant boxes placed along mouse runs
- Trapping — humane or snap traps depending on the situation
- Proofing — sealing all entry points with steel wool, wire mesh, and expanding foam
- Follow-up — monitoring visits to ensure complete elimination
Prevention
- Store all food in airtight containers
- Clean up crumbs and food debris immediately
- Seal gaps around pipes with steel wool or wire mesh
- Keep clutter to a minimum — mice love to nest in undisturbed areas
- Check deliveries and second-hand furniture before bringing indoors
Pest Control RAF SERV LTD offers fast, discreet mouse control across all London postcodes. Call 07586 072087 or book online today.