How to Rat Proof Your Home: 15 Ways to Protect Your Property

Rats are more than a nuisance – they're a real threat to your home, health, and peace of mind.

Once they find a way in, they breed fast, chew through almost anything, and leave behind a trail of damage and disease.

Fortunately, rat-proofing your home doesn't have to be complicated. With a little time and effort, you can turn your property into a place rats simply don't want to be.

We see rat-related orders climb from October right through to late spring, as colder weather pushes rats indoors in search of warmth and food – so early autumn is the ideal time to get ahead of them.

Here are 15 expert-approved ways to rat-proof your home and keep rats out for good.

N.B. If rats are already in your home, you may find our guide on which rat control method is right for you helpful.

One quick check before you start: rat droppings are large – around 10–20mm, raisin-shaped with blunt ends – while mouse droppings are much smaller at 3–6mm and rice-shaped. Raisin for rats, rice for mice. It matters here because mice slip through even smaller gaps, so if you're dealing with mice you'll need to seal tighter still.

One thing we see again and again: the routes people miss are rarely the obvious ones. Drains, air bricks and under-door gaps get overlooked time after time – and so does next door. In terraces and semis especially, rats often arrive from an adjoining property through shared walls, voids or drains, so proofing your own home only goes so far if the problem is coming from the other side. It's almost always a combination of routes, rarely just one – so work through the whole list below rather than sealing the first gap you find and stopping.

1. Remove Outdoor Food Sources

Rats have an incredible sense of smell and will travel long distances to find food. Fallen fruit, bird seed, unsealed bins, and pet bowls left outdoors are all open invitations. Keep your garden tidy and your bins tightly sealed.

2. Secure Household Rubbish & Compost

A flimsy bin lid won't stop a determined rat in your garden. Use sturdy bins with locking lids and clean them regularly to reduce odours. Compost heaps should be kept well away from your home and enclosed with fine mesh or a purpose-built compost bin.

3. Eliminate Water Access

Rats need water daily. Fix leaky taps, cover drains, and empty containers that collect rainwater to get rid of rats. Don't overlook areas like under sinks, utility rooms, or basements where moisture builds up.

4. Keep Storage Spaces Clutter-Free

Sheds, lofts, garages, and under-stairs cupboards are prime nesting spots – especially when filled with cardboard, fabric, or unused items. Keep storage tidy, raised off the floor, and in sealed containers.

5. Tidy Up Your Garden & Drive

Rats love cover. Trim overgrown shrubs, mow your lawn regularly, and keep the area along fences and walls clear. Avoid storing anything up against your property that rats could use for shelter.

6. Move Firewood Away from the House

Stack firewood and timber at least a metre from any exterior walls, and ideally on a raised platform. This helps prevent rats from hiding or nesting beneath it – and makes your home less appealing.

7. Seal Gaps and Holes Rats Can Squeeze Through

Rats can squeeze through surprisingly small gaps, so treat anything around the size of a 10p coin (about 25mm) or larger as a must-fix – and don't ignore narrow horizontal gaps under doors and along thresholds, as rats can push under gaps as small as 10–12mm, and young rats need even less. Use proofing products such as metal mesh or steel wool with a solid finish (mortar, cement or a metal plate) so rats can't pull it out or chew through it. Avoid relying on standard foam alone – use it only as a secondary seal over a chew-resistant barrier. Wire wool works well for small holes and door-frame corners, held in place with sealant so it can't be pulled free.

8. Install Heavy-Duty Door Sweeps

Exterior doors often have small gaps underneath that rats can wriggle through. Fit sturdy, metal-reinforced door sweeps to block access, especially in older properties or outbuildings.

9. Cover Air Bricks, Vents & Chimneys

All vents and air bricks should be protected with fine, non-corrosive metal mesh or an air brick cover. Chimneys can also be an entry point for climbing rats, so fit a proper cap if yours is unused.

Tip: Fix mesh or an air brick cover over air bricks and vents without blocking airflow – the goal is to stop entry while keeping ventilation working.

10. Reinforce Drains & Toilets

Rats are excellent swimmers and can enter your home through broken drainpipes or even toilets. Consider installing a one-way rat blocker or backflow valve in your sewage system, especially if you've had previous infestations.

11. Block Utility Entry Points

Check where pipes, cables, and wires enter your home – these are prime rat highways. Seal around them with a combination of steel wool and caulk, or mesh and mortar, depending on the size of the gap.

12. Store Food in Rat-Proof Containers

Rats can chew through plastic bags and cardboard with ease. Use thick plastic, glass, or metal containers for food storage, particularly in pantries, garages, or sheds. Don't forget pet food and bird seed.

13. Destroy Burrows & Tunnels

If you find a burrow near your foundation or garden structures, collapse it immediately and fill the hole with gravel or concrete. Rats may abandon the site if their nest becomes unstable or exposed.

14. Carry Out Regular Inspections

Stay ahead of the problem by checking for signs of rats every few weeks. Look for droppings, chewed packaging, smear marks along skirting boards, or scratching sounds at night. Note the date you last saw fresh signs – when that gap keeps growing, your proofing is working.

15. Know When to Call the Experts

Sometimes a DIY approach isn't enough. It's worth calling in a professional pest controller if you see rats in daylight, activity spreads across more than one room, or signs keep appearing after you've proofed and trapped – and sooner if there are young children, elderly or unwell people in the home. A professional can provide advanced solutions and long-term protection.

FAQs: Rat-Proofing Your Home

What size gap can a rat get through?

Rats can squeeze through very small gaps – treat anything around the size of a 10p coin (roughly 25mm) or larger as urgent, and don't overlook narrow gaps under doors and along thresholds, which rats can push under at as little as 10–12mm. Proof thoroughly around doors, pipes, vents and sheds.

Should I cover air bricks?

Yes – cover them with metal mesh or an air brick cover to stop entry, but don't block ventilation.

Can rats come up through toilets or drains?

They can enter via damaged drains. If you've had repeat issues, consider a drain inspection and a one-way blocker or backflow device.

Is expanding foam enough to stop rats?

Not on its own. Use a chew-resistant barrier (mesh or metal) and finish solidly (mortar or a metal plate); foam can then help seal small edges.

Are glue traps legal in the UK?

Rodent glue traps are effectively off-limits for DIY use. In England they're illegal unless used under licence by a professional (Glue Traps (Offences) Act 2022), and in Wales and Scotland they're banned outright. We don't recommend or sell them for rodents – proofing plus traps or bait stations is the safer route.

Final Thought

Rat-proofing isn't something you do once and forget. It's a mindset – an ongoing effort to protect your space, reduce temptation, and block access routes. And it's the part that lasts: in our experience, sealing entry points is what keeps rats out for good, long after traps and deterrents have done their bit. A rat-free home is cleaner, safer, and far more comfortable. Don't let rats take over. Take back control today.

We go to great lengths to make sure all our DIY rat control products are effective, fast and easy to use. You may also find our expert guide to getting rid of rats useful if you want to learn more about clearing rats from your home or workplace.