Finding a spider repellent that works is harder than product packaging can make it sound. UK homeowners can choose from barrier sprays, essential-oil products, ultrasonic plug-ins, and homemade remedies, but their results are not equally well supported. For lasting control, preventing spiders from getting inside should form the foundation of your approach.
| Quick answer | What to know |
| Most dependable first step | Seal gaps around doors, windows and other entry points. |
| Natural option with some evidence | Peppermint or mint oil, although results vary between species |
| Common remedy with limited evidence | Conkers may deter certain species but are not dependable whole-home protection. |
| Remedy with poor experimental support | Lemon oil |
| Ultrasonic plug-ins | Do not rely on them as your main control method. |
| Commercial sprays | Follow the label and apply only where directed. |
| Peak UK activity | House spiders are particularly noticeable from August to October. |
| Pet households | Be cautious with essential oils, especially around cats |
Direct answer: The most dependable way to reduce spiders indoors is to block the gaps they use to enter, remove webs, and reduce insect prey. Repellent sprays may provide an extra barrier, while peppermint has limited experimental support. Ultrasonic devices and traditional household remedies should not replace physical spider-proofing.
Which types of spider deterrent are worth considering?
UK shops sell several kinds of deterrents, but the word “repellent” can cover products that work in quite different ways. Some sprays use mint or other aromatic ingredients, while insecticidal products contain active substances intended to control arthropods. There are also plug-in devices and traditional household remedies with no spray involved.
The key is to separate manufacturer claims from independent evidence. The Natural History Museum says no device has yet provided an effective general solution for deterring house spiders and recommends preventing entry. The British Arachnological Society also notes that spiders can continually recolonize homes through windows, doors, air bricks, chimneys and other openings.
| Option | Evidence and practical value | Pros | Cons |
| Physical exclusion | Strong practical recommendation from UK natural-history sources | Long-lasting, chemical-free, tackles entry routes | Requires checking and sealing several areas |
| Mint-based barrier spray | Some laboratory evidence for mint oil on certain species | Easy to apply around entry points | Effects can vary, and applications may need repeating. |
| Insecticidal spray | Can control listed arthropods when appropriately authorized and used | Direct treatment for a defined pest problem | Requires careful label compliance and may kill rather than deter |
| Ultrasonic plug-in | Weak basis for relying on it as a stand-alone solution | No spraying or residue | Results are uncertain. |
| Conkers | Limited experimental effect on some tested species | Cheap and simple | Not dependable across species or throughout a home |
| Lemon or citrus oil | Lemon oil failed to repel the tested species in one controlled study. | Pleasant scent to many people | Popular claims exceed the available evidence. |
Our recommendation: start with exclusion and housekeeping, then add a properly labelled barrier product if you still need another layer. That gives you a practical system rather than expecting one bottle or plug-in to solve every sighting. Readox’s guide to pest control for a healthy home sets out the same approach for the other species you are likely to meet indoors.
How to choose a spider repellent in the UK
Look first at what the product is designed to do rather than choosing by scent or packaging. A deterrent intended to discourage entry is different from an insecticidal product that kills arthropods, so check the active ingredients, directions, and areas where it can be applied. The UK Health and Safety Executive advises users of biocidal products to consider non-chemical alternatives first and to follow product labels carefully.
Price should be compared alongside bottle size and reapplication frequency. Listings checked in September 2026 showed examples ranging from £5.99 for a 750 ml natural barrier spray to £10.99 for a 500 ml product, while another 200 ml formulation was listed at £14.99. Prices change, so treat these figures as a snapshot rather than a permanent buying guide.
7 practical ways to keep spiders out of a UK home
The strongest approach combines entry prevention with regular cleaning and sensible use of any deterrent you choose. This matters because eliminating the spiders you can see does not prevent others from entering later. The following routine focuses first on changes that continue working after a spray scent has faded.
- Seal gaps around doors and windows. Check worn seals, thresholds and obvious cracks, and add draught excluders or suitable sealant where needed.
- Fit insect screens where practical. Screens can reduce access through windows that stay open during warmer weather without requiring chemical treatment.
- Remove webs and egg sacs during routine cleaning. Vacuum corners, window frames, behind furniture, and other undisturbed areas where webs repeatedly appear.
- Reduce the insects spiders feed on. Keep food covered, deal with flies and other indoor insects, and avoid leaving outdoor lights on unnecessarily beside open windows.
- Move outdoor hiding places away from entrances. Where possible, keep stored materials, dense vegetation and clutter away from doors and frequently opened windows.
- Apply a labelled barrier product only as directed. Target the locations specified on the packaging rather than spraying indiscriminately around rooms.
- Repeat your inspection during late summer and autumn. House spiders are especially mobile from August through October, so this is the time to check gaps and worn seals again.
Cleaning supports this routine because undisturbed corners and clutter make spider activity less noticeable until a spider wanders into an open room. Readox’s carpet-cleaning guide offers more detail on maintaining floor areas, while its Home Improvement section covers wider household maintenance. Regular maintenance also makes it easier to identify the particular entry points where activity keeps returning.
Does peppermint oil repel spiders?
Peppermint has better evidence than many internet remedies, but that evidence has limits. A controlled study published in the Journal of Economic Entomology tested peppermint oil, lemon oil and chestnut fruits against three spider species. Mint oil strongly deterred two tested species, while the third showed less sensitivity, meaning the findings do not prove that peppermint works equally well on every spider found in a British home.
That distinction matters when assessing homemade sprays and products that promise broad protection. A mint-based deterrent may be reasonable as an extra measure around selected entry points, but it should not replace sealing gaps. You should also test any preparation on a hidden area before applying it near paint, timber or other finished surfaces; Readox has separate advice on maintaining hardwood flooring.
Are natural remedies automatically safer?
“Natural” does not mean harmless in every household. Cats Protection lists peppermint, citrus, clove, eucalyptus and several other essential oils among those that can be toxic to cats, particularly in concentrated forms. This makes casual DIY essential oil spraying a poor choice if a pet could walk through the residue, rub against a treated surface, or inhale concentrated oils.
For commercial products, follow the exact directions and warnings on the packaging rather than assuming an ingredient is safe because it comes from a plant. HSE guidance says biocidal-product users are responsible for using products without harming people, animals, wildlife or the environment. If you have children, cats, dogs or other animals at home, check the product-specific instructions before treatment and keep concentrates securely stored.
Do conkers, citrus and ultrasonic plug-ins work?
Conkers have a more complicated evidence story than the familiar claim that they simply do nothing. The laboratory study cited above found that chestnut fruits deterred two of the three species to varying degrees, but the response differed between species. That makes a bowl of conkers an unreliable substitute for closing the route spiders are using to enter.
Citrus claims also deserve caution because lemon oil showed no repellent effect on any of the three species in that experiment. Ultrasonic plug-ins face a different problem: they are easy to use, but strong evidence for dependable household control is lacking, and the Natural History Museum has not identified any device as an effective deterrent. If you already own a plug-in, treat it as optional rather than your main defense.
Why do you see more house spiders in autumn?
Seeing a large spider on the carpet in September does not necessarily mean your home suddenly has an infestation. The Natural History Museum explains that adult male house spiders become conspicuous in autumn while searching for females, and they commonly move at night between August and October. Open windows and gaps beneath doors give these wandering spiders easy access to living spaces.
Spiders are also useful predators of other household invertebrates, so a zero-spider home is neither realistic nor necessary. The British Arachnological Society says removing an existing population does not stop new individuals from recolonizing suitable spaces. If you are comfortable doing so, a stray spider can often be captured and moved rather than killed.
When should you consider professional pest control?
Occasional sightings during autumn usually call for prevention rather than professional treatment. A specialist becomes more useful when you have persistent activity in the same area, cannot identify the animal safely, or suspect another pest problem is supplying a constant food source. A professional can also inspect building defects that make repeated entry easier.
Before using stronger chemical control yourself, check whether a physical solution can fix the underlying problem. HSE specifically recommends considering alternatives such as sealing doors and windows, keeping affected areas clean and dry, and preventing unwanted organisms from entering. These steps can reduce the amount of chemical treatment you need.
A practical next step for a spider-free-feeling home
If you’re choosing a spider repellent, inspect your doors and windows before buying anything. Seal the routes you can find, clean recurring web areas, and then choose a clearly labelled deterrent only if you want an added barrier. This gives you a more durable approach than relying on scent, folklore, or a plug-in alone.
A few house spiders are normal, and complete elimination is unlikely to last because new individuals can enter from outside. Concentrating on the points where they enter gives you more control with less unnecessary treatment. For further household prevention ideas, continue with Readox’s healthy-home pest-control guide.
Frequently asked questions
There is no single product proven to keep every species out of every home. Physical exclusion has the clearest support from UK natural-history guidance, particularly sealing windows, door gaps and other entry routes. A labelled barrier spray can then be used as a secondary measure if you want additional deterrence.
Peppermint has some experimental evidence behind it, although effectiveness varied between the species studied. Lemon oil did not deter any of the three species in the same experiment, so the common citrus claim should be treated cautiously. Scent-based methods are better viewed as supplementary measures than guaranteed barriers.
There is not strong enough evidence to recommend ultrasonic plugs as your main method of keeping spiders outside. The Natural History Museum advises preventing entry through physical measures rather than relying on a deterrent device. If you use a plug-in, combine it with sealing and cleaning rather than expecting the device to work alone.
Most spiders you find in British homes are part of normal household wildlife and help control other small invertebrates. The Natural History Museum provides identification information for several common species and explains that many would prefer conditions outside modern heated living spaces. Avoid handling an animal you cannot identify if doing so makes you uncomfortable.
There is no universal schedule because formulations differ. Current UK products give different reapplication instructions, with some recommending weekly use and others suggesting treatment every two or three weeks or after cleaning. Always use the interval printed on your product rather than copying the schedule from another brand.
