What Are the Most Common Types of Cockroaches That Infest Homes?

The most common types of cockroaches that infest UK homes are the German cockroach (Blattella germanica) and Oriental cockroach (Blatta orientalis). Both species can establish themselves inside buildings, although they differ considerably in appearance, behaviour and the conditions they prefer.

American cockroaches and brown-banded cockroaches are also occasionally encountered in the UK, particularly in heated buildings. However, these species are much less common than German and Oriental cockroaches.

Identifying the species correctly is important because different cockroaches favour different hiding places and may require different approaches to treatment.

1. German Cockroach (Blattella germanica)

German cockroaches are among the most troublesome indoor cockroach species in the UK. They are relatively small, measuring approximately 10–15 mm in length, with light brown or tan bodies and two distinctive dark stripes running lengthways behind the head.

These cockroaches prefer warm environments where food and water are readily available. Kitchens are particularly attractive, especially the concealed spaces behind refrigerators, cookers, dishwashers and kitchen cupboards. German cockroaches reproduce relatively quickly, allowing infestations to develop before homeowners realise how many insects are present. Females carry their egg cases until shortly before hatching, helping protect the developing young.

Because they spend much of their time hidden in narrow cracks and crevices, an infestation may remain unnoticed until cockroaches begin appearing regularly at night.

2. Oriental Cockroach (Blatta orientalis)

Oriental cockroaches are another established pest species in the UK. They are considerably larger than German cockroaches, typically measuring around 20–30 mm, with shiny dark brown or almost black bodies.

Unlike German cockroaches, Oriental cockroaches favour cooler, damp environments. They are commonly associated with basements, cellars, drainage systems, utility rooms and areas around leaking pipes.

Their wings are reduced, and they cannot fly. They may enter buildings from surrounding outdoor areas, particularly where suitable damp hiding places are available.

Oriental cockroaches generally develop more slowly than German cockroaches, but established populations can still cause persistent problems. Their association with drains and other unhygienic environments makes their presence in kitchens and food storage areas particularly concerning.

3. American Cockroach (Periplaneta americana)

American cockroaches are much less common in UK homes than German or Oriental cockroaches. They are more frequently associated with consistently warm, humid environments, including some commercial premises, heated service areas and buildings with suitable drainage systems.

Adults are large, usually measuring approximately 35–50 mm, with reddish-brown bodies and a pale yellowish marking around the area immediately behind the head.

Both sexes have well-developed wings and are capable of flight, although their flying behaviour varies with conditions.

Their size makes them particularly noticeable when discovered indoors. However, finding a large cockroach does not automatically mean it is an American cockroach, so identification should be based on several physical characteristics rather than size alone.

4. Brown-Banded Cockroach (Supella longipalpa)

Brown-banded cockroaches are less frequently encountered in the UK but can establish themselves inside heated properties.

Adults are small, typically around 10–14 mm long, with light to medium brown bodies. Their most distinctive feature is the presence of pale bands across the wings or abdomen, depending on the insect’s age and sex.

Unlike German cockroaches, which are strongly associated with kitchens and moisture, brown-banded cockroaches can tolerate relatively dry indoor conditions.

They may hide inside furniture, cupboards, behind picture frames and around electrical equipment. Their tendency to occupy higher and less humid areas can make them more difficult to detect using inspection methods focused entirely on kitchens and bathrooms.

How Can You Tell These Cockroach Species Apart?

The easiest way to distinguish common cockroach species is to compare their size, colour and markings.

Species	Adult size	Appearance	Typical hiding places
German	10–15 mm	Light brown, two dark stripes	Kitchens, appliances, cupboards
Oriental	20–30 mm	Shiny dark brown or black	Cellars, drains, damp areas
American	35–50 mm	Reddish-brown, pale marking behind head	Heated service areas, warm drains
Brown-banded	10–14 mm	Brown with pale crossbands	Furniture, cupboards, warm dry spaces

These characteristics are most useful when examining adult cockroaches. Young cockroaches, known as nymphs, can look considerably different and may be harder to identify.

Which Cockroach Species Is Most Likely to Infest a UK Kitchen?

German cockroaches are particularly well adapted to warm indoor kitchens. Their small bodies allow them to hide in narrow gaps around appliances, cupboard fittings and plumbing connections.

They can survive on small amounts of food and moisture, meaning even a reasonably clean kitchen may provide suitable conditions if an infestation has already become established.

Oriental cockroaches can also appear in kitchens, especially where damp areas or drainage access points are nearby. However, their preferred hiding places are often closer to the ground and associated with moisture.

The location of a sighting can therefore provide useful clues, although it should not be used as the only method of identifying the species.

Do Cockroaches Build Nests?

Cockroaches do not build organised nests like wasps or ants. Instead, they gather in sheltered hiding places, often referred to as harbourages, where conditions provide warmth, moisture and protection.

German cockroaches may concentrate behind kitchen appliances and inside narrow cabinet gaps. Oriental cockroaches are more likely to occupy damp voids, drainage areas and sheltered spaces near the ground.

These hiding places may contain droppings, shed skins and egg cases, providing useful evidence when investigating an infestation.

How Do You Know if Cockroaches Are Breeding in Your Home?

Finding one cockroach does not necessarily mean a large infestation is present. However, repeated sightings or the discovery of cockroaches at different stages of development can indicate an established population.

Young cockroaches are smaller than adults and do not have fully developed wings. Finding several nymphs of different sizes suggests that reproduction may be taking place within or close to the property.

Other warning signs include dark droppings, discarded skins, egg cases and a persistent unpleasant odour where substantial activity is present.

For more information, read our guide on how to recognise a cockroach infestation.

Why Is Correct Cockroach Identification Important?

Different cockroach species require different inspection priorities. A treatment focused entirely on kitchen appliances may overlook Oriental cockroaches living around damp drainage areas,

while inspecting drains alone may miss German cockroaches breeding behind electrical equipment.

Correct identification also helps establish whether cockroaches are breeding inside the property or entering from another location.

Professional pest controllers consider the species, extent of activity and likely harbourages before selecting suitable treatment methods. This is particularly important in shared buildings and commercial premises, where insects may move between adjoining areas.

Professional Cockroach Control

Cockroaches can be difficult to eliminate because they remain hidden for much of the day and may reproduce in places that are difficult to access.

Youngs Pest Control provides professional cockroach treatments for homes and businesses, including inspections to identify the species, locate activity and determine an appropriate treatment approach.

Our family-run business has over 35 years of pest control experience and serves customers across Greater Manchester, Cheshire and Merseyside.

If you’ve discovered cockroaches in your property, contact Youngs Pest Control on 0161 776 9832 or 07845 815 261 for professional advice.