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Why Mice Move Indoors in Autumn — and How to Keep Them Out

Mouse emerging from under kitchen cupboard during autumn in York home

As the weather turns colder, mice begin searching for somewhere warm, dry, and close to a food source. Unfortunately, that often means your home, garage, or business premises.

At Pest Assured, we see a sharp increase in callouts each autumn across York and North Yorkshire. Here’s why it happens — and what you can do to stay one step ahead.


Why Mice Head Indoors

Unlike some animals, mice don’t hibernate. They remain active all year round, which means they need warmth and food even in the coldest months.

Common entry points include:

  • Small gaps under doors and around pipework

  • Cracks in brickwork or old air vents

  • Roof spaces, lofts, and garages

Even the tiniest opening — around the width of a pencil — can be enough for a mouse to squeeze through.


Signs You Might Have Mice

Early signs of mouse activity include:

  • Small black droppings, usually near skirting boards or food cupboards

  • Scratching sounds under floors, behind walls, or in the loft

  • Gnaw marks on cables, cardboard, or food packaging

  • A faint, musky smell

If you notice any of these, it’s best to act quickly. A small problem can become a much larger infestation within weeks.


Why It’s Best to Get Professional Help

DIY traps and supermarket bait often only deal with a small part of the problem. Mice breed quickly and can nest in hidden areas where store-bought products can’t reach.

A professional pest control visit ensures:

  • Full inspection of your property to locate entry points

  • Safe, targeted treatments

  • Advice to prevent re-entry and long-term issues

At Pest Assured, we’re fully qualified and insured, providing a friendly, local service across York and North Yorkshire.


How to Prevent Mice Moving In

Prevention is always the easiest approach.

  • Seal any small gaps in walls, doors, and around pipes

  • Keep food sealed in airtight containers

  • Clear up crumbs and pet food overnight

  • Store firewood away from the house

  • Avoid leaving bird seed or garden food out overnight

Even small changes can make a big difference.


How We Can Help

If you suspect mice have already found their way in, our team can help quickly and discreetly.

We use professional-grade equipment and techniques to remove rodents safely, and we’ll advise you on preventing further issues.

📞 Call: 07375 775 999

📧 Email: enquiries@yorkpests.co.uk

Pest Assured — keeping York’s homes and businesses rodent-free all year round.

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📞 07375 775 999   📧 enquiries@yorkpests.co.uk