A German cockroach report in an HMO or rented property can quickly raise difficult questions.
Is the activity limited to one room, or are cockroaches also present in a shared kitchen or neighbouring part of the building? How quickly can access be arranged, and what should tenants do while the problem is being assessed?
We’re seeing more German cockroach reports from HMOs and rented properties in this area than we used to. These cockroaches hide well and can increase in number quickly, so it’s sensible to have the activity assessed early.
When you contact Guardian, you’ll speak directly to a pest professional. We’ll discuss what has been reported, explain the options and recommend the most sensible next step.
Why German cockroaches are a concern
German cockroaches can be difficult to spot because they hide in small gaps, often near warmth, food and water. In a shared property, a sighting in one room can leave tenants and property managers unsure whether the activity is limited to that room or has spread to shared areas.
They can contaminate food and surfaces as they move between waste and food preparation areas. Droppings and shed skins can also be a concern, particularly in kitchens and food storage areas.
German cockroaches can be brought into a property in packaging, deliveries, second-hand appliances or other goods. Finding them does not automatically mean that a property is unclean.
German cockroach biology and identification
Adult German cockroaches are small, usually around 10 to 15 mm long, and light brown or tan. The clearest identifying feature is the pair of dark stripes on the shield behind the head. These are sometimes described as racing stripes.
They’re smaller and lighter than Oriental cockroaches, which are larger and usually dark brown or black. German cockroaches prefer warm indoor places and are often found in kitchens, around appliances, cupboards and pipework.
German cockroaches develop through three stages: egg, nymph and adult. The female carries her egg case, called an ootheca, until shortly before the eggs hatch. Each case can contain around 30 to 40 eggs.
The nymphs are small and dark when they hatch. They grow through several moults before becoming adults. In warm indoor conditions, development can be rapid. Females can produce several egg cases during their lives, allowing numbers to build quickly.
How Guardian treats German cockroaches
The right approach depends on where the cockroaches are active, how far they may have spread and the type of property.
We inspect the affected areas, assess the activity and explain what we recommend. Treatment may include targeted professional gel, monitoring and practical advice about food storage, cleaning and access points.
Gel treatment can often be carried out without people needing to leave the property. Any precautions depend on the product and where it’s applied, and we’ll explain what’s needed.
One visit may not be enough. Egg cases can hatch after treatment, so monitoring and follow-up visits may be recommended. We’ll explain the plan and provide a digital report after the visit.
Frequently asked questions
Are German cockroaches the same as Oriental cockroaches?
No. German cockroaches are smaller and usually light brown, with two dark stripes behind the head. Oriental cockroaches are larger, darker and are more often found in cool, damp areas.
Does seeing one German cockroach mean there are more?
Not always, but it’s worth taking a sighting seriously. German cockroaches hide well and reproduce quickly, so repeated sightings should be investigated.
Can German cockroaches come in through deliveries or appliances?
Yes. They can be carried in packaging, goods and second-hand appliances. Finding them does not automatically mean the property is unhygienic.
Will one treatment be enough?
Not necessarily. Egg cases may hatch after the first treatment, so monitoring and follow-up visits may be needed. We’ll explain what’s appropriate for the situation.
Do I need to leave the property during treatment?
Not always. Targeted gel treatment can often be carried out while people remain in the property. We’ll explain any precautions that apply to the treatment we recommend.
I’m a tenant. Can I arrange treatment myself?
If the landlord or letting agent is arranging and paying for the work, they need to authorise it. You can contact us directly if you’re arranging and paying for the work yourself.
Can I use a household spray?
It’s best to ask for advice before spraying. Household products may affect cockroach behaviour and make the activity harder to assess or treat.
Talk to us about German cockroaches
Tell us where the cockroaches have been seen and what has happened so far. We’ll help you work out the most sensible next step.
