Mice in Walls: How to Tell If You Have Them and What to Do
Wednesday 20th August 2025
Are you hearing scratching in your walls at night? Strange scuttling noises behind skirting boards or plasterboard? If so, you may have mice in your walls — a common problem for both London homeowners and businesses.
At Pestec Pest Control, we’ve helped thousands of customers across London and tackle mouse infestations quickly, safely, and discreetly. Here’s how to spot the signs, why mice choose walls as their hideout, and what you should do next.
How to Tell If You Have Mice in Your Walls
If you’re wondering “What are the signs of mice in walls?” here are the most common clues:
1. Scratching or Scurrying Sounds
The most obvious sign is noise. Mice are nocturnal, so they’re most active when it’s quiet at night. Listen out for:
Scratching or tapping
Light scuttling noises
Chewing or gnawing sounds
2. Bad Smells Coming from Walls
A musky odour is often caused by rodent urine or droppings trapped in cavity walls or insulation.
3. Droppings and Grease Marks
Look for tiny droppings (the size of a grain of rice) and greasy smudges around cracks or holes. These are strong indicators of mouse activity.
4. Chewed Wiring or Plaster
Mice constantly gnaw to keep their teeth sharp. Damage to plaster, skirting boards, or electrical wires is another red flag.
Why Do Mice Hide in Walls?
Mice don’t just appear randomly — London’s dense housing, older buildings, and frequent renovations create endless access points and hiding spots. Common entry routes include:
Gaps around pipes and vents
Cracks in brickwork or foundations
Broken drains
Shared walls in flats and terraced housing
Walls offer warmth, safety, and easy access to food sources — making them an ideal nesting spot.
How to Get Rid of Mice in Walls
So, you’ve spotted the signs. What next?
✅ Act Quickly
Mice reproduce rapidly. Ignoring the problem could turn a small issue into a major infestation within weeks.
✅ Call Professional Pest Control
DIY traps may catch one or two mice, but they rarely solve the root problem. At Pestec Pest Control, our certified technicians use proven methods, including:
Non-invasive wall inspections to locate nests
Professional baiting and trapping systems
Entry-point proofing to block future access
Drain surveys to stop mice travelling underground
Prevention advice tailored to your property
Professional Mice Control in London
Whether you’re dealing with scratching in the walls of a London flat or a larger commercial property, Pestec Pest Control can help. We provide fast, discreet, and long-term solutions to protect your home or business from rodent infestations.
👉 Contact us today for expert advice and same-day service across London.
