Start by asking why they are there
Pests come into a home for three things: food, water and shelter. Almost every effective low-toxicity approach works by removing at least one of these, which is why prevention usually beats treatment. Spraying something on a visible ant or cockroach rarely solves the problem if the colony is elsewhere and the food source is still available.
It also helps to identify the pest. Ants, moths, mice, silverfish, flies and wasps need different responses, and acting on a guess can waste effort or make things worse. If you are not sure what you are dealing with, photograph it or keep a specimen in a sealed container, and ask a local pest professional or your council’s environmental health service.
Seal the ways in
Small gaps are often enough. Mice can squeeze through very small openings, and insects through even smaller ones.
- Look around pipes, cables, vents, air bricks, door thresholds, and the edges of flooring.
- Fill small gaps with a suitable filler or sealant, and use a fine metal mesh for larger holes where mice are an issue, since they can gnaw through soft materials like foam or plastic.
- Fit brush strips to the bottom of external doors and repair damaged window or door screens.
Many of these steps overlap with draught proofing, so they can reduce heat loss as well. If the pest problem comes from a damaged roof, wall or drain, a proper repair is a better answer than any amount of trapping.
Make food and waste less available
- Store dry food in sealed containers made of glass, metal or thick plastic. Pantry moths, beetles and ants find it harder to reach sealed food, and spillages are easier to see.
- Clean up crumbs and spills promptly, including under appliances and in cupboards. Wipe worktops at night.
- Do not leave pet food out overnight and store the bag sealed.
- Empty indoor bins regularly and keep lids closed. Cutting down on food waste has a double benefit, since less discarded food also means less to attract pests.
- Check stored goods such as flour, rice, cereal and dried fruit when you buy and again if you see moths. Good produce storage habits also keep fruit flies in check.
Outdoor habits that matter
Rodents and insects are drawn to what is outside as well. A compost bin can attract rats if it contains cooked food, meat or fish, or if it has gaps at the base. A closed, well-built bin and sensible contents lower the risk. Bird feeders can also draw rodents when seed spills, so clearing the ground below regularly is advisable. Stacked wood, dense clutter and overgrown plants against walls give pests places to hide, so keep a gap between them and the building.
Traps and barriers
Traps are targeted, so they tend to be less hazardous than sprays and baits, but they are not risk-free.
- Snap or enclosed traps for mice should be placed along walls where droppings or gnaw marks appear, and out of reach of children and pets. Check them often, and follow guidance on humane use and local rules, as some methods may be restricted.
- Sticky traps capture insects and can help you identify what you have, but they can also trap non-target animals and are generally not considered humane for rodents.
- Fruit fly traps, such as a jar with a little vinegar or fruit juice and a funnel of paper, can help catch adults. The more lasting fix is to remove the ripe fruit or waste they are breeding in.
- Physical barriers such as door sweeps, fly screens and mesh do not depend on chemicals at all.
Homemade mixes: use caution
Online sources suggest many sprays and powders, such as essential oils, vinegar, peppermint, diatomaceous earth or bicarbonate of soda. Evidence that these reliably get rid of an infestation is limited, and effects are often short-lived. Some can also cause harm.
- Essential oils can irritate skin and airways and can be harmful to pets and children.
- Fine powders can irritate lungs and eyes when airborne, so avoid breathing them in.
- Do not mix cleaning products together for a stronger effect, since some combinations release harmful gases.
- Label anything you make, and keep it, and any commercial pesticide, locked away, following the same principles as for chemical storage.
- Do not place any bait, powder or spray where pets or small children can reach it.
A simple soapy-water spray used directly on a visible insect is about as far as a homemade approach usually needs to go. If you use a commercial product, follow the label exactly, and look for one authorised for household use in your area.
When to call a professional
DIY methods have limits. Consider calling a licensed pest controller or your landlord or local authority if:
- you see signs of rats or mice that continue after you have sealed and cleaned,
- you find wasp or hornet nests, which can be dangerous to remove, particularly if anyone is allergic to stings,
- bed bugs, cockroaches or termites are suspected,
- the problem keeps returning, or
- a household member has a health condition that makes exposure risky.
Many professionals can explain what they use and offer prevention advice. If you rent, report pest problems to the landlord, since responsibility often lies with them.
Linking to the garden
Pest control inside the home overlaps with how you manage the garden, where the same prevention-first thinking applies. Integrated pest management is a useful framework outdoors. Indoors, the focus is simpler: deny access, deny food, and treat only when necessary.
This is general information, not professional advice.