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row of old houses in london

Why Older Buildings Have More Pests

Do old buildings have more pests? The unfortunate answer is yes. The older a building is, the more likely it is to be infested with insects and other pests. But why does this happen? Is it simply the age of the building itself? In most cases that’s exactly what it is. Here are just a few of the factors that lead to old buildings having an increased number of pests.

The reasons why older buildings have more pests

Why do old buildings have more pests? The biggest is that old buildings have hundreds of nooks and crannies where pests can live undisturbed. As the building gets older, cracks and holes form. Things break and subside, and gaps appear in all sorts of places. This gives pests a myriad of places to hide, and is what invites them to stay and make your property their home.

london house with cracked walls

The simple fact is that in an older building, pests like insects have also had plenty of time to infiltrate on a large scale level. It’s easy for some parts of your property to become populated with ever-growing generations of pests that have ensconced themselves. Old buildings have more pests is because they have places that are left alone for years. This can include dozens of areas such as disused rooms, lofts and attics, cupboards and basements.

What wears away over time to give them the perfect spot?

Something else that may encourage pests are ageing walls. Over the decades, stone and brick walls will develop significant holes, gaps and cracks. This gives pests easy access to come and go. And for some pests, such as mice, decaying walls  present a terrific place to live and build nests in. This is especially true if there is a large cavity between the walls. Remember, mice can fit through a gap the size of a pencil. This means they can squeeze through even the tiniest hole in a wall.

dusty insects in attic

Then you have things like floorboards and old beams. When the building is new, these fit snuggly with no gaps between them. As time goes by, however, gaps develop and pests can easily enter your living space. In addition, it becomes easier for pests like rats to chew on wooden structures as they weaken over time. Also consider units that are not fitted properly anymore. These provide great living spaces for all sorts of pests.

These are essentially the primary reasons why old buildings are riddled with pests in comparison to a newer home. As we’ve said, it’s simply time and the ageing of the building. As the years pass, the building ages. Pests move in and multiply exponentially. This also makes it that bit harder to get rid of them.


Sally has been writing on the subject of pest control for 4 years. She always carries out extensive and in depth research and always tries to bring you the most up to date, interesting topics.

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