Dealing with Spider Infestations: Common Species and Prevention Methods

Spiders play a central part in our ecosystem. They consume the insects that destroy our crops, controlling insect populations as they eat and hunt. But when they become unwelcome guests in our kitchens, bathrooms and garden sheds, it can be a serious cause for concern. The last thing you want is a spider infestation! 

So, let Premier Pest Control take you on a guided tour of spider infestation prevention: we’ll tell you how to deal with them and what you can do when they invade your home. 

Are there any venomous spiders in the UK?

Yes, there are venomous spiders in the UK. 

However, these species are not overly aggressive and don’t contain enough venom to be considered dangerous to humans. If you provoke them, they may bite you, so here are a few common species you should keep an eye out for: 

False Widow Spider (Steatoda)

The False Widow gets its name from its passing resemblance to another, more dangerous North American spider: the Black Widow. False widows have a dark brown upper body, glossy legs and a cream-coloured pattern on their abdomen. 

If they bite you, you may feel pain localised around the wound and see a small amount of swelling. However, these spiders only bite as a last resort and will not attack unless provoked. 

Brown Recluse Spider (Loxosceles reclusa)

Brown Recluse Spiders can vary in colour but typically have a light to medium brown body.  

These spiders are more common in the US, but they can sometimes be found in wardrobes, garages, toilets and other undisturbed areas of UK homes. 

Again, they only bite when provoked, and many feel no symptoms when the skin is punctured.

However, some may experience a painful stinging sensation. Their venom is also necrotic, meaning there’s a chance of necrosis if the wound becomes infected. 

European Garden Spider (Araneus diadematus)

The European garden spider is a common sight in gardens across the UK. While it may appear intimidating with its large size and intricate web, it is harmless to humans and mainly feeds on flying insects.

Its bite can cause nausea and swelling that lasts a couple of days. 

How to prevent spider infestations

Now that you know exactly what spiders to keep at arm’s length, how do you protect your home? 

Below, we’ve listed seven tried and tested methods for preventing spider infestations. 

Apply a residual pesticide

Commercial pesticides work a treat: choose one specifically designed to deter spiders, spraying it around windows, doors, and other potential entry points to create a barrier. 

Although they can be effective, residual pesticides have some limitations. They only work if the spider drags itself through the insecticide, and if they avoid the areas you’ve sprayed, it will not prevent infestations. 

Keep your house tidy

A cluttered and untidy house provides spiders with hiding places and easy access to food sources.

To deter spiders, keep your house clean and organised. Regularly vacuum and dust to remove cobwebs and spider eggs. Pay special attention to dark and secluded areas such as basements, attics, and closets.

Turn off your outdoor lights

Spiders are attracted to light, especially flying insects that gather around outdoor lights. 

By turning off unnecessary outdoor lights or replacing them with yellow or sodium vapour lights, you can reduce the number of insects and, consequently, the spider population around your home.

Use natural oils and nuts

Certain essential oils, such as peppermint, tea tree, and lavender oil, are known to repel spiders.

Grab a spray bottle of water and mix in 15 to 20 drops of your chosen essential oil. Give the cracks and crevices of your home a good spritzing, reapplying the solution for maximum effectiveness. 

However, if this doesn’t work, fill your spray bottle with a more aggressive substance, like vinegar. Spiders are also thought to be deterred by walnuts and chestnuts, so try placing these around your home for further reinforcement. 

Get rid of vegetation

Spiders are attracted to vegetation, especially when it comes close to the exterior of your home. 

Trim shrubs, bushes, and branches that touch or hang over your house. Removing these potential pathways reduces the chances of spiders finding their way indoors.

Spread Earth around your home

Spreading diatomaceous earth around the perimeter of your home can act as a natural barrier against spiders. 

This fine powder is derived from fossilised algae and is harmless to humans and pets. When spiders come into contact with the earth, it damages their exoskeletons, leading to dehydration and death.

Seal any cracks 

Spiders can enter your home through even the tiniest cracks and gaps. 

Inspect your house thoroughly and seal any openings, including gaps around windows, doors, utility pipes, and vents. Use caulk or weatherstripping to ensure a tight seal, making it difficult for spiders to gain access.