How to Get Rid of Rats in London Homes: Inspection, Drains and Proofing Routes

How to get rid of rats in a London home depends on finding the route, not just treating the visible activity. Rats may enter through drains, gardens, air bricks, underfloor voids, wall defects, pipe entries or shared routes in terraced houses.

This guide explains how to identify rat activity, why inspection should come before treatment, how drains and underfloor routes affect control, what clients can expect during treatment, and why proofing often matters for long-term results.

At Inoculand, we inspect and treat rat problems across London. Head Biologist Daniel Neves draws on these cases to explain how to identify active routes, distinguish drainage and structural access, and combine treatment with proofing for longer-term control.

Need help getting rid of rats? See our rat control service

How to get rid of rats properly

To understand how to get rid of rats properly, you need to identify where rats are active, how they are entering, what supports them and whether the route can be closed after treatment. A quick baiting visit may reduce signs for a short period. However, the problem can return if rats can still reach the property.

In London homes, rat activity often involves larger structural routes than mouse activity. Drains, air bricks, underfloor voids, gardens, basement areas, low-level wall defects and terraced-house routes all deserve attention before a technician decides the control plan.

In practice, the most reliable way to get rid of rats follows a sequence: confirm the signs, inspect likely routes, treat current activity, monitor progress, reduce food and harbourage, then proof or repair the route where practical.

How to recognise rat activity indoors and outside

Before treatment starts, the evidence should point clearly to rats rather than mice or another issue. Rats usually leave larger droppings, heavier noises, stronger route marks and more obvious external or underfloor signs than mice.

Common signs of rats in house areas, gardens or external routes include:

• Larger droppings near routes, walls, gardens, underfloor areas or external access points.
• Heavier scratching, thudding or movement under floors or inside walls.
• Gnaw marks on timber, plastic, pipes, doors, vents or stored materials.
• Burrows or worn runs in gardens, borders, compost areas or beneath sheds.
• Smear marks or rub marks along repeated routes.
• Odour near underfloor voids, service areas, drains or hidden routes.
• Repeated sightings close to bins, gullies, manholes, air bricks or external walls.

If droppings are the first sign, see our guide to rat droppings in London homes.

How to get rid of rats starts with the right questions

One of the first questions to ask is simple: where did you notice the rat activity, and what signs did you notice?

That answer gives useful direction before the technician even arrives. For example, a sighting in a garden points to a different investigation from scratching under the floor, droppings inside a kitchen unit, odour in a basement or activity close to a manhole.

Useful follow-up questions include:

• Was the activity seen indoors, outdoors or both?
• Was it a sighting, noise, smell, droppings, damage or disturbed material?
• Which floor or room seems affected?
• Is the activity close to a kitchen, bathroom, basement, bin area, air brick, drain cover, garden wall or neighbour boundary?
• Has the property had rats before?
• Do neighbours, tenants, staff or managing agents report similar signs?

Therefore, the first conversation should start building a map of likely routes. The inspection then confirms or challenges that early suspicion.

How to get rid of rats in the house starts with route inspection

Rat control should be route-led. The most important question is not only whether rats are present, but where they are coming from and how they are moving through the property.

A useful inspection should look at internal signs, external pressure and possible hidden routes. This may include kitchens, bathrooms, basements, underfloor voids, air bricks, gardens, gullies, manholes, wall defects and neighbouring routes.

Inspection matters because rats may enter from one area and appear in another. For instance, noise under the floor may relate to a garden route, broken air brick, drainage defect or hidden wall gap away from the room where the sound is heard.

Internal signs

Internal signs can include droppings, scratching, smell, gnawing, damaged materials, disturbed insulation, contaminated food areas or movement beneath floors and inside walls. Their location helps point towards the route.

External signs

External signs can include burrows, runs, rub marks, gnawing, garden sightings, disturbed bins, activity near sheds, gaps around walls or signs close to gullies and manholes.

Hidden routes

Hidden routes may involve drains, underfloor voids, air bricks, service entries, wall cavities, basements, extensions or connected routes in terraced houses. These routes need careful assessment before proofing decisions begin.

How to get rid of rats when drains are involved

A technician should consider drains when rat activity keeps returning, when signs appear on the ground floor, when there is underfloor noise near kitchens or bathrooms, or when no obvious external hole explains the problem.

Rats can move through damaged drains, redundant pipes, defective gullies, broken inspection chambers or old drainage connections. In these cases, baiting may reduce activity, but it will not repair the access route.

Possible drainage clues include:

• Repeated ground-floor rat activity.
• Rats heard under floorboards near kitchens, bathrooms or utility areas.
• Odour near service voids, drains or underfloor spaces.
• Rats seen near gullies, manholes or inspection chambers.
• Activity returning after treatment.
• No obvious external wall hole despite repeated signs.
• Soil, stones, debris or evidence of blockage inside an inspection chamber.

Where evidence suggests a drainage route, a CCTV drainage survey, repair, non-return valve or further investigation may help. Rat treatment can often continue while the route is checked. However, lasting control depends on dealing with the underlying access point.

For a more detailed explanation of manhole checks, rat blockers, CCTV surveys and when drain repair may be needed, see our guide to rat blockers for drains and drain surveys.

For general public guidance on pest issues and local authority support, you can also see GOV.UK guidance on pest control on your property.

How to get rid of rats at home when gardens and bins support activity

Gardens can support rat activity when food, shelter, water and cover are available. A garden sighting does not always mean rats are inside the house. However, repeated activity close to the building increases the risk of entry.

Common external factors include:

• Open bins, loose waste bags or damaged bin lids.
• Compost containing food waste.
• Bird feeding, fallen seed, pet food or stray-cat feeding.
• Decking, sheds, dense planting or stored materials.
• Neighbouring gardens, alleyways or shared external spaces.
• Burrows near walls, fences, sheds or compost areas.
• Fly-tipping, loose timber, pallets or rubbish stored against boundaries.

If the garden keeps supporting rat activity, rats may continue exploring the building edge. As a result, they may reach air bricks, vents, low-level wall defects, pipe gaps or drainage points.

For more detail, see rats in the garden and routes into the house.

How to get rid of rats under floors, in walls, in lofts or in ceilings

Underfloor routes are common in older London homes, terraced properties and buildings with suspended timber floors. Rats may enter through air bricks, damaged vents, pipe gaps, garden routes, drain defects or low-level wall openings.

Signs that rats may be using an underfloor route include:

• Scratching, thudding or movement below floor level.
• Odour from underfloor areas or service voids.
• Activity near air bricks, vents or external walls.
• Droppings near floor edges, pipework or access panels.
• Repeated signs after treatment.
• Garden or drain activity close to the affected wall.

Clients sometimes ask how to get rid of rats in walls, how to get rid of rats in loft spaces, or how to get rid of rats in ceiling areas without access. The same principle applies: the technician needs to understand how rats reached that void before sealing routes or placing control measures.

Underfloor rat activity needs careful timing. If rats are still inside a void, sealing routes too early can trap them inside the structure or push them into another area.

For a deeper diagnostic guide, see rats under floorboards and hidden routes.

How to assess a rat infestation

A technician judges a rat infestation by the amount of evidence, the number of affected areas, the frequency of activity and the level of bait take over time.

Evidence of a more serious rat infestation can include:

• Droppings in several areas.
• Repeated sightings or noise over time.
• Activity inside living spaces or food storage areas.
• Strong pungent odour.
• Heavy gnawing damage.
• Many smear marks or rub marks.
• Large bait take on repeated visits.
• Activity continuing after initial treatment.

Bait take can be especially informative. If all bait has gone on the follow-up visit, activity is likely to be significant. If the bait quantity increases and all bait disappears again, the problem may need more than a standard short course of treatment. At that stage, drainage work, proofing, neighbour cooperation, longer-term monitoring or a contract-style approach may be needed.

How to get rid of rats with treatment and monitoring

Treatment aims to reduce the rats currently active in and around the property. However, the right method depends on the route, access, safety risks, food sources, drain involvement, pets, children, occupants and whether rats are inside hidden voids.

Professional rat treatment may involve carefully placed control measures, monitoring, follow-up checks and proofing advice. The aim is not only to reduce visible activity, but to understand why rats reached the property in the first place.

Baiting

Baiting can help when rats are active along known routes and bait can be placed safely and securely. Placement matters because bait placed away from the active route may have little effect, especially where other food sources are available.

Baiting also works as a diagnostic tool. If rats take bait, that confirms activity in that location. The quantity taken can help show where activity is strongest and whether the problem sits mainly indoors, outdoors, underfloor, around drains or close to external access points.

Traps

Traps can help in accessible internal areas where carcass odour is a concern or where removal needs more control. A trapped rat can be retrieved, which reduces the risk of a dead rat decomposing in an inaccessible void.

However, traps depend on good placement and access. In underfloor voids, partitions or tight service areas, the technician may need an inspection hatch or lifted boards to place traps safely and effectively.

Follow-up checks

Follow-up checks help confirm whether activity is reducing, whether control measures are working and whether the likely route remains active. Without monitoring, a short quiet period can be mistaken for long-term control.

For a more procedural guide, see how professional rat control works.

What to expect during rat infestation treatment

Clients should not always expect an instant visible result after the first visit. The first stage often starts the treatment, gathers evidence and tests the technician’s route theory.

Between the first and second visit, several things may happen:

• Activity may reduce quickly.
• Activity may continue while rats feed or move through the same routes.
• Traps may catch one or more rats.
• Bait may be taken even if the client hears or sees very little.
• Dead-rat odour may occur if a rat dies in an inaccessible void.

In some cases, clients expect more activity because rats return to feed on bait. However, many clients do not notice an increase even when bait take appears on the follow-up visit. Less commonly, a dead rat smell may develop. Depending on the location, airflow, temperature and size of the rat, this can last around 5 to 10 days, and sometimes longer if access is poor.

How to get rid of rats by reducing food and harbourage

Reducing food and shelter helps make rat control more effective. It does not replace treatment or proofing. However, it can reduce the pressure around the property and make rats less likely to remain close to the building.

Useful steps include:

• Keep bins closed and replace damaged lids.
• Avoid leaving loose waste bags outside overnight.
• Stop or reduce bird feeding while activity is present.
• Clear fallen seed, fruit and food debris.
• Store pet food, bird seed and animal feed in sealed containers.
• Avoid adding cooked food, meat, fish or oily waste to open compost.
• Reduce dense harbourage, clutter, timber piles and rubble where practical.
• Check sheds, decking and side returns for burrows or runs.

These steps can reduce support for rats, but they will not close a drain defect, air brick, underfloor route or structural gap.

Proof the routes rats are using

Proofing often reduces repeat rat activity. Treatment may reduce current numbers, but proofing reduces the routes that allow rats into drains, underfloor voids, gardens or the structure of the home.

Common rat proofing areas include:

• Damaged or unprotected air bricks and vents.
• Low-level wall defects and missing mortar.
• Gaps around pipes, waste pipes and service entries.
• Openings beneath doors, steps, extensions or side returns.
• Access points linked to underfloor voids.
• Drain defects, gullies or inspection chambers where confirmed.

Proofing should follow the evidence. Random sealing can miss the real route, block useful clues or create problems if rats are still active inside a void.

For more detail, see rat proofing for drains, underfloor routes and external defects.

Why rat treatments fail or appear to fail

A treatment can appear to fail when the access route remains open, when environmental pressure is too high, or when the local rat population keeps receiving food and harbourage nearby.

Common reasons include:

• Only the visible activity received treatment.
• A drain defect or redundant pipe remains open.
• Air bricks or vents remain damaged or unprotected.
• Garden food sources continue attracting rats.
• Underfloor routes were not identified.
• Weak proofing materials failed under rat pressure.
• Neighbouring activity continues in a shared route.
• Holes were blocked before the route was properly understood.
• Rubbish, pallets, compost, dense vegetation or fly-tipping continue providing harbourage.

Sometimes the treatment itself works, but the site supports more rats than the treatment can reasonably keep ahead of. This can happen near overflowing restaurant bins, unmanaged bin chambers, railway environments, damaged drains, fly-tipping, overgrown land or shared boundaries.

In those situations, adding more bait may reduce numbers for a time. However, it will not deal with the source. Long-term control usually depends on removing food, reducing harbourage, improving waste storage, closing access routes and coordinating with neighbouring properties or managing agents where necessary.

How to get rid of rats in terraced houses

Terraced houses can be more complicated because rats may use connected gardens, shared drains, underfloor voids, party-wall routes or neighbouring defects. The visible activity may appear in one property while the route begins elsewhere.

Useful checks in terraced houses include:

• Rear gardens, side returns and shared boundaries.
• Air bricks along the front and rear elevations.
• Suspended floors and underfloor voids.
• Gullies, manholes and drainage routes.
• Old pipe entries and previous building work.
• Basements, cellars and service areas.
• Neighbouring bins, compost, sheds or garden harbourage.

Where neighbouring routes are involved, lasting control may depend on wider access, shared drainage checks or coordinated proofing.

Is it rat activity or mouse activity?

Both rodents can leave droppings, make noises and damage materials, but they usually use different routes. Rats more often use drains, gardens, air bricks, underfloor voids and larger access defects. By contrast, mice usually use smaller indoor service gaps, kitchen voids, pipework and risers.

If droppings are the main clue and you are unsure which rodent you have, see rat droppings vs mouse droppings.

When landlords, freeholders or managing agents should get involved

A landlord, freeholder or managing agent should get involved early when rats affect a rented property, block of flats, shared building, commercial premises, childcare premises, food premises, shared garden, bin chamber, drain system or structural part of the building.

Rats can escalate quickly. They can cause distress, hygiene concerns, tenant complaints, council involvement, business disruption, reputational damage and property damage. In addition, they can affect rental confidence and sale confidence more severely than many other pests.

Tenants can report signs and keep areas clean, but they may not have authority to arrange drain access, structural repairs, shared proofing, bin-store improvements, neighbour communication or access to communal areas.

For block management, the biggest improvements often come from keeping bin chambers, gardens, boundaries and service areas in good condition. However, that may not be enough if rats enter through holes, damaged vents, defective masonry, drain routes or neighbouring structures.

The biggest misconception about rat control

The biggest misconception is that baiting alone will solve the problem.

No amount of baiting will give lasting control if rats still have an open route into the property. Treatment can reduce local activity, but it cannot provide a complete answer if rats still have access through drains, wall defects, underfloor gaps, air bricks, pipe entries, garden burrows, neighbouring structures or other openings.

As long as the route remains open, the property remains vulnerable to reinfestation. Even proofing has limits if rat pressure remains high around the building and alternative routes are not understood.

The key distinction is simple: baiting reduces the current rat activity, but route control gives the best chance of lasting protection.

When to arrange professional rat control

You should consider professional help if you see rats indoors, if droppings keep returning, if there is underfloor noise, if activity is close to drains or air bricks, or if garden activity is moving closer to the house.

Professional help also makes sense where there are children, pets, tenants, vulnerable occupants, food preparation areas, basements, shared buildings, drain concerns or repeated activity after previous treatment.

A useful rat control visit should answer:

1. Are the signs likely to be from rats?
2. Does activity look current?
3. Where are rats most active?
4. Are drains, gardens, air bricks, underfloor voids or wall defects involved?
5. What treatment method suits the property?
6. Which proofing, drainage or environmental steps may reduce repeat activity?

Related rat guides

• How professional rat control works
• Rat droppings in London homes
• Rat droppings vs mouse droppings
• Rats under floorboards and hidden routes
• Rats in the garden and routes into the house
• Rat proofing for drains, underfloor routes and external defects
• Rat control in London

Need help getting rid of rats?

If you have rat droppings, scratching, garden sightings, underfloor noise, drain concerns or signs around air bricks, vents and external walls, contact us. We can inspect the evidence, identify likely routes, treat current activity and advise on rat proofing, repairs or drainage next steps where needed.