The house mouse (mus domesticus) is the most common species in London although the more rural field mouse is sometimes found inside houses in the late autumn when the weather gets colder.

The adult mouse weighs less than 25 grams and has brown to grey fur on its back and grey to white underneath. It has large ears in relation to its body and small feet. Its tail is thin and the same length as its body.

Once inside your home, mice will typically make their nests underneath floorboards or in wall cavities. They can live quite happily outdoors for part or even all of the year. Mice tend to be more active at night. They can climb well and can squeeze through astonishingly small gaps as small as a few millimetres. This means they can quite easily enter our homes and often the point of entry is far from obvious.

They do not tend to need a separate water supply and can usually find enough moisture from their food.

Mice can be a health hazard because they can spread diseases. They will eat food intended for humans, and ruin the rest of it with their urine, droppings and fur. Mice can also damage buildings by gnawing through woodwork, wires, pipes and household items.

Life cycle

A mouse will live for around a year, during which time a female may breed up to 10 times. The average size of a litter is six.

If you find mice (or signs of their presence in your home) you can get rid of them yourself. Most garden centres, hardware shops and large chemists stock poisons and traps. Follow the instructions carefully. Or you can get a professional pest control technician in to carry out a survey, give you advice and carry out a course of treatment for you.

Treatment services

If you have problems catching mice, or if you simply do not wish to tackle the problem yourself we can help. We would normally carry out a survey and offer advice. If we agree to carry out treatment we would expect to visit again once or twice until the problem has been solved. These three visits would usually be two or three weeks apart.


Please refer to our current fees and charges for the cost of this treatment service. In some cases we may consider that the problem relates to an infestation that is more widespread than just your property. This is often the case in flats and terraced housing. In such cases we would carry out a survey and may refer the matter to our environmental health officers to establish the extent of and responsibility for the infestation. Treatment normally requires visits to a number of nearby homes at the same time and you and your neighbours will share the costs.

Get information on fees and charges on our pest control homepage.