How to Get Rid of a Cockroach Infestation
Safe, practical guidance for UK homes, flats, restaurants and commercial premises — with professional cockroach control available across London from Bon Accord Pest Control.
Inspection-led cockroach treatment, monitoring and prevention for London properties.
Quick answer
How do you control a cockroach infestation?
The best way to get rid of a cockroach infestation is to combine correct identification, detailed inspection, improved hygiene, removal of food and water sources, targeted professional treatment, monitoring and follow-up. Cockroaches hide in cracks, warm appliances, pipe routes, drains, cupboards, service voids and communal areas, so simply spraying visible insects is rarely enough.
For an established infestation — especially in kitchens, bathrooms, flats, restaurants, hotels or commercial premises — professional treatment is usually the safest and most reliable option.
Why it matters
Why cockroach infestations need proper control
Cockroaches are public-health pests that can contaminate food, preparation surfaces, cupboards, appliances and utensils as they move through kitchens, drains, waste areas and hidden voids.
Hidden harbourage
Cockroaches shelter deep inside cracks, appliances, pipework and service voids.
Fast breeding
German cockroach infestations can develop quickly when warmth, food and water are available.
Hygiene risk
Activity close to food areas creates contamination, compliance and reputational concerns.
Identification
Signs of a cockroach infestation
- Live cockroaches, especially at night.
- Dead cockroaches, shed skins or brown egg cases.
- Small dark droppings that may look like black pepper or coffee grounds.
- Musty or unpleasant odour in heavier infestations.
- Activity around sinks, dishwashers, fridges, cookers, pipework or food cupboards.
- Cockroaches appearing when a light is switched on at night.
- Reports from neighbours, tenants, staff or other units nearby.
Common UK species
German cockroaches and Oriental cockroaches
German cockroaches
Often found in warm, humid areas close to food and water, including kitchens, restaurants, cafés, hotels, staff kitchens, fridges, dishwashers, cookers and service risers. They can reproduce quickly, so early treatment matters.
Oriental cockroaches
Often darker and larger, and more commonly associated with damp areas, drains, basements, refuse areas, boiler rooms, ground-floor spaces and lower-level building routes.
Correct identification matters because species behaviour affects inspection, treatment location and prevention advice.
First steps
What to do first if you find cockroaches
1. Take clear photos
Photograph the insect, droppings or egg cases to help confirm the species.
2. Note where and when
Record the room, time of day, and whether activity is near food, water, drains or appliances.
3. Reduce food and water
Clean surfaces, empty bins, seal food, remove pet food overnight and repair leaks where possible.
Control plan
How to control a cockroach infestation properly
Effective cockroach control is a process, not a single spray. The aim is to reach the hidden infestation, reduce activity safely and prevent recurrence.
Step 1: Identify the species
Confirm whether activity is German cockroach, Oriental cockroach or another insect before choosing treatment.
Step 2: Inspect harbourage points
Check appliances, sinks, pipework, cupboard hinges, cracks, risers, drains, basements and service voids.
Step 3: Improve hygiene
Remove grease, crumbs, open food, spilled liquids and competing food sources before and after treatment.
Step 4: Remove moisture
Fix leaks, condensation, dripping taps, damp cupboards and standing water under appliances.
Step 5: Reduce hiding places
Seal cracks and gaps where appropriate, reduce cardboard storage and improve access for inspection.
Step 6: Monitor activity
Use sticky monitoring traps to understand affected rooms, movement routes and treatment progress.
Step 7: Target treatment
Use professional gel bait, targeted residual treatment or other methods according to the species and site risk.
Step 8: Follow up
Recheck activity, traps, hygiene, preparation and whether neighbouring routes are involved.
Treatment method
Targeted professional treatment
Professional cockroach treatment may involve gel baits, targeted residual treatment, dust formulations in specific inaccessible areas, monitoring and follow-up. The exact method depends on the species, property type, infestation level and safety considerations.
Treatment should focus on harbourage points, movement routes, appliance areas, pipework, sinks, service voids and food-area risk zones.
Avoid these mistakes
What not to do with a cockroach infestation
Do not rely only on supermarket sprays
They may kill visible insects but usually fail to reach the hidden population.
Do not spray over gel bait
Sprays can contaminate bait points and reduce treatment effectiveness.
Do not ignore one cockroach
Seeing one can mean there is hidden activity nearby, especially in kitchens and bathrooms.
Do not leave food overnight
Food residues, pet food and water sources can keep the infestation active.
Do not move infested appliances carelessly
Cockroaches can hide inside fridges, microwaves and coffee machines.
Do not assume it is one flat only
In blocks, cockroaches may move through risers, ducts and pipe routes.
Where infestations start
Cockroaches in kitchens, bathrooms and drains
Kitchens
Check behind fridges, fridge motors, cookers, dishwashers, sink units, cupboard hinges, pipework, plinths, kickboards, bins and food storage cupboards.
Bathrooms and drains
Check bath panels, sink pipework, toilet boxing, damp cupboards, floor gaps, ventilation routes, drain areas and service voids.
Do not use harsh drain chemicals as a cockroach control plan. Hidden infestations usually need inspection and targeted treatment.
Flats and shared buildings
Cockroach infestations in flats and shared buildings
Cockroach infestations in flats can be more complex because the source may not be limited to one unit. Activity can move through pipe risers, service ducts, wall voids, communal bin stores, shared kitchens, basements, laundry rooms, neighbouring flats and commercial premises below residential units.
Landlords, managing agents and block managers should consider a building-level inspection where more than one unit is affected.
Related service: Block Management Pest Control London
Food businesses
Cockroaches in restaurants and commercial kitchens
For food businesses, cockroaches are a serious hygiene and compliance concern. They can damage reputation and create risk during inspections.
- Professional inspection and species identification
- Treatment plan and monitoring
- Follow-up visits and reporting
- Cleaning under and behind equipment
- Waste management review
- Proofing and maintenance advice
- Record keeping where required
Related service: Restaurant Pest Control London
Timelines
How long does it take to get rid of a cockroach infestation?
The time needed depends on the species, infestation level, number of affected rooms, hygiene conditions, access to harbourage points, whether neighbouring units are involved, whether the site is residential or commercial, and whether follow-up is completed.
Light activity may reduce quickly after treatment, but established infestations usually need monitoring and follow-up. The goal is not only to reduce visible cockroaches, but to stop hidden activity from continuing.
Can you get rid of cockroaches permanently?
Cockroaches can be controlled successfully, but long-term prevention depends on hygiene, moisture control, sealed food storage, waste management, crack and gap sealing, monitoring and early reporting. Reintroduction can happen through neighbouring units, deliveries, second-hand appliances, packaging and building defects.
Why choose Bon Accord
London cockroach control from a trusted pest management specialist
Bon Accord Pest Control Ltd is a premium London pest management specialist providing cockroach control for homes, flats, landlords, managing agents, restaurants, hotels and commercial premises.
Our approach is calm, discreet and inspection-led. We focus on identifying the species, locating harbourage points, applying targeted treatment, advising on hygiene and prevention, and helping reduce the risk of return.
Before booking
What to send before booking
- Clear photos of the insect
- Photos of droppings or egg cases
- The room where activity was seen
- Whether sightings are during the day or night
- Whether activity is near food, drains, appliances or bins
- Property type: home, flat, restaurant, hotel, office or shop
- Whether neighbours or other units have activity
- Whether DIY sprays have already been used
- Your postcode and preferred contact details
- Any access or tenant details needed
Send photos through the contact page or call 020 3369 6965.
Related services
Related Bon Accord guides and services
Cockroach Control London
Professional treatment for cockroach infestations.
Pest Control Prices
Clear starting points for common pest services.
Residential Pest Control
Support for homes, flats and landlords.
Commercial Pest Control
Discreet pest management for businesses.
Restaurant Pest Control
Food business pest management in London.
Property Management
Pest support for managed properties and agents.
FAQ: Cockroach infestation control
Identifying the Problem
The first step in controlling a cockroach infestation is to accurately identify the problem. Cockroaches are nocturnal creatures that prefer dark and warm areas, such as kitchens, bathrooms, and basements. They leave behind droppings that resemble small black pellets and emit a distinct musty odor. Additionally, cockroach eggs, shed skin, and dead roaches may be visible in areas of infestation.Preventive Measures
Preventing a cockroach infestation is key to long-term control. Here are some preventive measures you can take:- Keep your home or business clean: Cockroaches are attracted to food and water sources, so it’s important to maintain a clean environment. Regularly clean up spills, wipe down surfaces, and sweep or vacuum the floors.
- Seal entry points: Cockroaches can enter through small cracks and crevices. Seal any gaps around doors, windows, and pipes to prevent their entry. Pay special attention to areas where utility lines enter your property.
- Store food properly: Cockroaches are notorious for infesting pantries and cabinets. Store food in airtight containers and avoid leaving pet food out overnight. Regularly clean out your pantry and discard expired items.
- Eliminate moisture sources: Cockroaches need water to survive. Fix any leaks or plumbing issues to eliminate moisture buildup. Ensure that areas prone to dampness, such as basements and bathrooms, are well-ventilated.
Professional Pest Control
While preventive measures can help deter cockroaches, professional pest control services are often necessary to eliminate an existing infestation. Here’s how a professional pest control company can help:- Inspection: A trained technician will conduct a thorough inspection of your property to identify the extent of the infestation and locate potential hiding spots.
- Treatment plan: Based on the inspection findings, a customized treatment plan will be developed to target the specific species of cockroach infesting your property. This may involve a combination of baits, insecticides, and insect growth regulators.
- Follow-up visits: Effective cockroach control often requires multiple treatments. A professional pest control company will schedule follow-up visits to monitor the progress and make any necessary adjustments to the treatment plan.
- Prevention advice: In addition to treating the current infestation, a professional pest control technician can provide advice on preventive measures to minimize the risk of future infestations.
