Mouse Control & Infestation Signs (UK Home and Business Guide)

Quick answer — how to get rid of mice properly

The shortest path to a mouse-free property is a survey-led plan: confirm species, map runs and harbourage, install dense protected placements (traps or secured baits) exactly on edge routes, proof tiny entry gaps, and fix housekeeping that’s rewarding the mice. When all four steps happen together, results follow quickly and don’t rebound.

The unmistakable signs of a mouse infestation

Mice leave patterns that are easy to recognise once you know where to look. If you spot two or more of the following, call for professional mouse control.

Small droppings (3–8 mm), widely scattered

Rice-grain droppings with tapered ends in cupboard corners, behind kickboards, in loft perimeter edges and around boiler cupboards. Fresh droppings are dark and glossy; older turn grey and crumble.

Gnawing on packaging and woodwork

Neat “pencil” gnaws on cardboard, soft plastics and food bags; chamfered edges on skirting or kickboard corners; nibble marks around cable holes.

Grease rubs and dust tracks

Fine smears at floor–wall junctions, along cable runs and pipework. Torchlight at low angles makes them obvious.

Nocturnal scurry sounds

Light, rapid “tick-tick” movement behind units or under floors, especially after midnight. Heavier thumps point to rats; fast, light movement points to mice.

Odour in enclosed voids

A stale, slightly sweet smell around cupboards, risers or loft corners where droppings accumulate.

Food sampling

Multiple nibbles across different items in a cupboard—mice test-feed rather than commit to one dish. That behaviour dictates dense placement for control.

Where mice get in (and why they keep coming back)

Finger-width gaps around services

The annulus around pipes, cable chases drilled too large, unsealed screw holes behind appliances—these are prime entries. Mice can squeeze through 6–7 mm.

Doors without brush strips

Back doors, internal stockroom doors, or integral garage doors with 10–15 mm daylight give mice an easy route.

Vents and under-unit voids

Unsleeved wall vents, damaged kickboard ends, and the warm void behind fridges and dishwashers provide cover, warmth and crumbs.

Loft and riser lines

Gaps where cables penetrate ceilings; unsealed loft hatch edges; shared risers in apartments that connect kitchens vertically.

Why DIY mouse control rarely works

• Too few placements for a “nibble and move” species
• Unsecured baits risking pets/children and causing bait shyness
• Traps off the edge route or without proper guidance to the trigger
• No proofing, so new mice just replace removed ones
• Premature “hole blocking” that traps mice inside rooms

Professional mouse control uses behaviour to your advantage, not guesswork.

Our mouse control method (A&H, step-by-step)

1) Detailed survey

We trace edge runs, confirm droppings age, map gnaw points and inspect kickboard voids, appliance backs, boiler cupboards, loft perimeters and service risers. Photos and notes ensure precise placements.

2) Dense, protected placements

Because mice sample many points, we deploy sufficient protected traps or secured baits at close intervals: edges, corners, behind appliances and at cupboard junctions. Boxes keep non-targets safe and guide approach over triggers.

3) Fine-gap proofing

We seal 6–7 mm routes using stainless mesh or scourer plus high-quality sealant, fit brush strips to doors, close kickboard ends, and cap cable chases—all without blocking appliance ventilation.

4) Hygiene and storage changes

We decant dry goods to sealed tubs, raise pet food off the floor, clean crumbs and grease behind kickboards, and set a simple routine staff or family can maintain. Small changes keep results permanent.

5) Follow-up and sign-off

We check placements, remove captures, top up where needed, then move to non-toxic monitors to confirm silence. You receive practical prevention notes for future works (e.g., seal any new cable holes the day they’re drilled).

Special settings (what changes)

Homes with pets or children

Trap-led programmes with locked boxes and careful siting. We brief you on safe clearances and revisit promptly.

Food businesses and hospitality

Audit-friendly plans emphasising non-toxic monitoring with rapid escalation. We document placements, proofing and hygiene advice for compliance.

Apartments and HMOs

Shared risers mean shared routes. We coordinate proofing around service cupboards and agree responsibilities to stop reinvasion from neighbouring units.

Aftercare—keeping mice out for good

• Maintain door brush strips; replace when bristles deform
• Seal any new penetrations immediately after trades finish
• Keep under-unit voids tidy; wipe spills promptly
• Do a quick spring/autumn check for droppings or new rub marks

When to call A&H

If two or more signs are present—or if you’ve tried DIY and activity persists—call 020 8295 3402. We’ll survey, install dense protected placements, close the tiny gaps, and return you to normal quickly and safely.