I have worked as a pest control technician across South London for more than 14 years, mostly in terraced houses, converted flats, restaurants, and small commercial units. I spend much of my week dealing with mice, rats, cockroaches, bed bugs, wasps, and the occasional squirrel that has found its way into a loft. The treatment itself is often the quickest part of my visit because the real work lies in finding the route, food source, harbourage point, or building defect that allowed the problem to develop. I have learned to slow down, inspect properly, and avoid promising that one container of bait will solve a structural problem.
I Start With the Building, Not the Pest
My first inspection usually begins outside, even if the customer has only seen activity in a kitchen or bedroom. I walk around the full perimeter and examine air bricks, pipe penetrations, drain covers, damaged vents, bin areas, and gaps below doors. On a typical terraced property, I may find 5 or 6 possible entry points before I step inside. Most of them will be harmless, but one greasy mark or fresh dropping can reveal the route that matters.
Inside, I pay close attention to the edges of rooms rather than the open floor. Mice tend to move along walls, behind appliances, and beneath fitted cabinets where they are less exposed. Rats may follow drainage lines or enter through poorly sealed service ducts, particularly in buildings that have been altered several times. The smell usually gives it away.
A customer one winter believed mice were entering through an open window because droppings appeared near the sink each morning. I removed the kickboards beneath the kitchen units and found a gap around a waste pipe that led directly into a shared wall void. The opening was roughly the width of 2 fingers, and old nesting material showed that it had been used for some time. Treating the visible mice mattered, but sealing that pipe gap after the activity stopped was what prevented the next group from moving in.
I also ask what changed before the problem began. Building work, a new takeaway nearby, overflowing communal bins, a damaged drain, or even a neighbour clearing an overgrown garden can disturb an established pest population. A useful inspection connects those changes to what I can physically see on the property. Guessing from the pest alone usually leads to wasted visits.
Good Treatment Has to Match the Evidence
I do not choose a treatment simply because it worked at the last property. A few mouse droppings behind a fridge require a different response from scratching sounds inside 3 connected ceiling voids. Bed bug activity in one divan base is not handled in the same way as an infestation spread across several bedrooms. I match the method to the species, the extent of activity, the people using the space, and the access available.
For customers who want to understand the local service area before arranging an inspection, I sometimes suggest reviewing pest control at diamondpestcontrol.co.uk as a practical starting point. I still believe the next step should be based on evidence from the property rather than assumptions made over the phone. A clear description of where activity has been seen, how often it occurs, and what signs are present can make the first visit far more productive.
Rodent work often involves a combination of monitoring, controlled treatment, cleaning advice, and proofing recommendations. I may place several secured monitoring points to establish which routes are active before concentrating treatment in those locations. In a home with children or pets, placement matters as much as the product being used, so I never leave loose material where it can be reached. Every station should have a reason for being there.
In food businesses, I work around operating hours, storage practices, cleaning routines, and legal responsibilities. I once visited a small restaurant where the owner had placed 12 cheap traps around the kitchen but had not checked the void beneath a raised storage platform. Droppings, shredded packaging, and a damaged vent were hidden below it. Once I found the harbourage area, the scattered traps made far less sense than a focused treatment and a repair to the vent.
Cockroach work demands similar discipline. Spraying every visible insect may create a brief feeling of progress, yet it can leave concealed harbourages untouched behind motors, cabinets, wall panels, and warm electrical equipment. I usually rely on careful placement and repeat inspection rather than soaking a room with unnecessary chemical. That changes the whole job.
I Treat Follow-Up Visits as Part of the Work
Many pest problems cannot be judged properly after a single appointment. Rodent activity may reduce quickly, but I still need to know whether feeding has stopped, fresh droppings have appeared, or another route has become active. Bed bug and cockroach treatments also require checks because eggs, hidden insects, and neighbouring harbourages can affect the result. I explain this early so the customer does not mistake the first quiet night for proof that every stage is complete.
During a follow-up, I compare fresh evidence with what I recorded during the first inspection. I check whether monitoring points have been disturbed, whether bait has been taken, and whether the customer has noticed activity in a different room. Even a small change can matter. A trap moved by 30 centimetres may perform better if it now sits directly against an active run.
A landlord contacted me last spring after another contractor had visited a flat 3 times without resolving a mouse complaint. The previous treatment points had been placed in the kitchen, but fresh droppings were appearing inside a cupboard beside the front door. I traced the route through a boxed-in heating pipe connected to the communal hallway. The mice were crossing the flat rather than living in the kitchen, so the treatment needed to follow that movement.
I also use follow-up visits to decide when proofing should begin. Sealing too early can trap rodents inside a building or force them into another room, especially in properties with shared walls and connected voids. Waiting too long leaves the route open for new activity. I prefer to see a clear drop in signs before closing the confirmed access points.
Preparation Makes Bed Bug Work More Effective
Bed bug jobs are often made harder by panic cleaning before I arrive. People move bedding into other rooms, carry bags through the house, or throw away furniture without wrapping it. Those actions can spread insects from one contained area into 2 or 3 previously unaffected spaces. I ask customers to leave the room as stable as possible until I have inspected it.
My inspection focuses on bed frames, mattress seams, headboards, nearby furniture, skirting edges, and items stored close to the sleeping area. I am looking for live insects, shed skins, spotting, and patterns that show where the main harbourage sits. Bites alone are not enough for me to confirm bed bugs because skin reactions vary widely and can have several causes. I want physical evidence before I recommend a full treatment programme.
One customer had slept on the sofa for nearly 2 weeks after noticing marks on an arm. By the time I arrived, the original bedroom showed limited evidence, but the sofa had become a second area of concern. Moving sleeping locations can encourage bed bugs to follow the host and spread through the property. I now stress that changing rooms without a plan often creates more work.
Preparation should be controlled rather than extreme. I normally provide instructions covering laundry, bagging, floor access, furniture movement, and what should remain in the room. A crowded bedroom may take an extra hour to inspect because every box, fabric item, and loose object creates another hiding place. Careful preparation allows me to treat the areas that matter without distributing the problem elsewhere.
Proofing and Housekeeping Must Be Realistic
I never tell a customer that poor hygiene automatically caused a pest problem. Mice can enter a clean house through a construction gap, and bed bugs can be brought into an immaculate bedroom inside luggage or used furniture. Cleanliness still affects how easily pests find food and how quickly signs are noticed. The distinction matters because blame does not help anyone solve the problem.
My proofing recommendations are usually practical and prioritised. I may identify 8 gaps around a property but advise repairing the 2 confirmed routes first, followed by the weaker secondary points. Materials must suit the location because soft filler alone is rarely useful in a gap that rodents can reach. I prefer repairs that can withstand movement, weather, cleaning, and normal building use.
In communal buildings, one resident can do everything correctly and still experience activity from another part of the structure. Shared pipe ducts, loft spaces, basement voids, and drainage systems allow pests to move between units without using the front door. I document those concerns so landlords, managing agents, or neighbouring businesses understand that the affected flat may not contain the original source. A coordinated response often saves several rounds of isolated treatment.
I also give housekeeping advice that people can actually maintain. Telling a busy family to remove every item from every cupboard is less useful than identifying the 3 shelves where damaged packaging and droppings are present. Food should be stored securely, spillages should be cleaned, and rubbish should not remain accessible overnight. Small routines performed consistently usually help more than one exhausting day of cleaning.
Clear Communication Prevents Expensive Mistakes
I ask customers to tell me about children, pets, allergies, previous treatments, and any access restrictions before work starts. Someone may have already used sprays, powders, traps, or online products that affect what I find during the inspection. A dog may be able to reach a low cupboard that appears secure to an adult. These details influence where I work and which options remain appropriate.
I also explain what I cannot promise. I cannot honestly guarantee that a mouse will never enter an old London property again, especially where neighbouring buildings share walls, drains, and roof spaces. I can identify evidence, reduce active infestation, recommend repairs, and explain what signs should trigger another inspection. That is more useful than a dramatic promise with conditions hidden in small print.
Cost discussions should be equally clear. A single wasp nest with easy access is a different job from rodent activity spread across a restaurant, basement, and storage floor. I consider the number of visits, treatment method, access difficulty, proofing needs, and risk level before describing the likely work. Customers make better decisions when they understand what the price covers and what may remain separate.
After years of opening kickboards, climbing into lofts, checking drains, and following faint marks through complicated buildings, I still rely on the same basic habit: I look for the cause before reaching for treatment. A pest sighting is only the visible part of the problem, and the route behind it usually tells the more useful story. I would rather spend another 20 minutes inspecting than leave a customer with a quick treatment that misses the active source. That approach may feel slower on the first visit, but it usually produces a cleaner and more dependable result.
Diamond Pest Control, 5 Lyttleton Rd, Hornsey, London N8 0QB. 020 8889 1036