Pest control is a trade where the stakes are high on both ends: undertreating a serious infestation causes real property damage and health risk, while overtreating — applying pesticides where they aren’t needed, or using methods that don’t address the actual entry points — wastes money and exposes your family and pets to unnecessary chemicals.

It’s also a trade with a significant range of operator quality. A licensed, experienced pest control professional performs a thorough inspection, identifies the species, diagnoses entry points and conditions that are attracting pests, and proposes a treatment plan proportional to the actual infestation. A low-quality operator applies a general pesticide spray, collects payment, and is unreachable when the problem returns in three weeks.

The questions in this guide apply whether you’re dealing with mice, rats, cockroaches, ants, bed bugs, wasps, wildlife, or any other pest situation. They’re organized by stage — before hiring, at the inspection, during and after treatment.

“The single most important thing a pest control company does is the inspection — before any treatment. The inspection tells you what you’re dealing with, where it’s coming from, and what conditions are allowing it to persist. A company that skips the inspection and goes straight to spraying is treating symptoms, not problems. The infestation comes back. The right questions before you hire separate the companies that solve problems from the ones that sell spray.”

— Renata Voss, licensed exterminator and integrated pest management specialist with 14 years of experience in residential and commercial pest control in the local area

Before You Call Anyone

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What pest are you actually dealing with?

Identifying the pest before calling a company matters — it helps you ask better questions and evaluate whether the proposed treatment is appropriate. Common your region residential pests and their distinguishing features:

Mice vs. rats: Mouse droppings are rice-sized; rat droppings are larger (like raisins). Mice are small enough to enter through a gap of 6mm (the diameter of a pencil). Rats need a slightly larger gap but are excellent climbers and swimmers.

German cockroaches vs. other species: German cockroaches (the most common indoor species) are small (1.5cm), tan-brown with two dark stripes behind the head, and almost never found outdoors. They live in kitchens and bathrooms and are notoriously difficult to eliminate. Other species are larger and less persistent indoors.

Carpenter ants vs. pavement ants vs. odorous house ants: Carpenter ants are large (up to 12mm), typically black, and indicate moisture-damaged wood. Pavement ants are small and typically nest under concrete. Species identification determines treatment.

Bed bugs: Small (apple seed sized), reddish-brown, flat, found in mattress seams, box spring folds, and furniture joints near sleeping areas. Look for small dark spots (feces) and shed skins.

If you can photograph the pest, do so before calling. Most companies can help with identification from a clear photo.

Is this a single sighting or an active infestation?

A single mouse seen once is not necessarily an infestation — it may be a transient that found its way in and can be addressed simply. An ongoing pattern of sightings, droppings in multiple locations, or evidence of nesting indicates an established infestation that requires a comprehensive approach.

Questions to Ask Before Hiring

A person is holding a spray gun.

Is your company licensed by the Ministry of the Environment?

In many regions, pest control operators who use pesticides must be licensed under applicable pesticide regulations. The company must hold a Pesticide Operator Licence, and individual applicators must hold a valid Exterminator Licence in the appropriate category (e.g., Category 1 for structural pest control).

Ask specifically: is your company licensed under your region’s pesticide regulations, and can I see the licence number?

What a good answer looks like: A current licence number that can be verified through the Ministry of the Environment, Conservation and Parks.

What is your approach — integrated pest management or chemical-first?

Integrated Pest Management (IPM) is the professional standard for responsible pest control. IPM addresses the conditions that allow pests to thrive — entry points, food sources, moisture, harborage — alongside any necessary chemical treatment. It uses the least toxic effective method, reserves chemical treatments for situations where they’re necessary, and includes exclusion work (sealing entry points) as part of the solution.

Chemical-first (spray-and-pray): Applies pesticides as the primary or sole intervention without addressing root causes. The pests come back because the conditions that supported them haven’t changed.

Ask specifically: how would you describe your approach — do you use integrated pest management principles?

What a good answer looks like: A described IPM approach that includes inspection, identification, exclusion recommendations, and targeted treatment proportional to the infestation.

Do you perform a thorough inspection before proposing a treatment?

Any reputable pest control company should inspect the property before proposing any treatment. The inspection should:

  • Confirm the species and extent of the infestation
  • Identify entry points, food sources, and harborage areas
  • Identify conditions (moisture, clutter, structural gaps) that are supporting the pest population
  • Inform a treatment recommendation proportional to the actual situation

Ask specifically: do you charge for the inspection, and does it happen before you propose a treatment?

What a good answer looks like: A described inspection process, with the treatment proposal flowing from inspection findings — not a generic package presented before any inspection takes place.

What pesticides will be used, and are they safe for children and pets?

Ask the company to specify what active ingredients will be used, the application method, and what re-entry interval applies after treatment — how long before children and pets can safely return to treated areas. Ask whether the products are registered with Health your country for residential use.

For more: Questions to Ask a Pest Control Company About Treatment Methods

Do you offer exclusion work alongside treatment?

Treating an infestation without sealing the entry points is incomplete work. For rodent problems especially, chemical treatment alone will only reduce the population temporarily — new mice or rats will enter through the same gaps that let the first ones in.

Ask whether exclusion work (sealing gaps, cracks, and entry points with appropriate materials) is part of the company’s service or whether it’s a separate recommendation.

What a good answer looks like: Exclusion work offered as part of the rodent control program, or a clear referral to exclusion specialists if it’s outside their scope.

Questions About the Quote

What is included in the service — inspection, treatment, follow-up, and guarantee?

Ask specifically what the quoted service includes:

  • Is the inspection included or charged separately?
  • How many treatment visits are included?
  • Is a follow-up visit included if the problem persists?
  • What is the guarantee — and for how long?

What a good answer looks like: A clear scope of service — inspection + initial treatment + follow-up if needed + defined guarantee period — in writing.

What is the guarantee, and what does it actually cover?

Pest control guarantees vary enormously in what they mean. Ask specifically:

  • How long does the guarantee last?
  • What conditions maintain it? (Some guarantees are voided if the homeowner doesn’t follow preparation or sanitation instructions.)
  • Does it cover a re-treatment at no charge if the pest returns within the guarantee period?
  • Does it cover the same pest species, or does it cover any re-infestation?

What a good answer looks like: A written guarantee with a specific duration, clear coverage terms, and a commitment to free re-treatment within the guarantee period if the original pest returns.

For more: Questions to Ask a Pest Control Company About Guarantees and Follow-Up

Pest-Specific Questions

For rodents: what exclusion work is being done?

Rodent control without exclusion is temporary. Ask specifically what gaps, cracks, and entry points will be identified and sealed. Ask what materials are being used — steel wool and caulk are temporary; metal flashing and expanding foam with wire mesh are more durable.

For more: Questions to Ask a Pest Control Company About Rodent Control

For bed bugs: what treatment method is being proposed?

Bed bug treatment is one of the most technically demanding in pest control. Ask whether heat treatment, chemical treatment, or a combination is being proposed. Heat treatment (raising room temperature above 50°C) kills all life stages including eggs. Chemical treatment requires multiple visits. Understand what the proposed approach entails for you — preparation requirements, duration, follow-up visits.

For more: Questions to Ask a Pest Control Company About Bed Bug Treatment

For wildlife (raccoons, squirrels, skunks): are you licensed for wildlife removal?

Wildlife removal in many regions is regulated separately from pest control. A company removing raccoons, squirrels, or other wildlife must comply with your region’s Fish and Wildlife Conservation Act. Ask whether the company is licensed for wildlife removal and what their relocation or exclusion approach is.

Red Flags to Watch For

Proposing treatment before completing an inspection. A company that quotes a treatment before seeing the property or identifying the specific pest and entry points is selling a product, not solving a problem.

Scare tactics about health risks or structural damage. Some pest control companies use exaggerated risk language to sell expensive treatment packages. Legitimate professionals describe the actual risk level based on the actual infestation found — not a worst-case scenario used to justify a premium package.

Unable to name the specific products being used. A licensed exterminator should be able to tell you exactly what pesticide will be applied, its active ingredient, and its Health your country registration number.

No guarantee offered. Any professional pest control company should stand behind their treatment with a guarantee. No guarantee offered means no confidence in the result.

High-pressure urgency. “You need to treat this today or the damage will be catastrophic” is a sales tactic. Legitimate pest control professionals describe the actual risk timeline clearly.

For a full guide: Red Flags When Hiring a Pest Control Company

Before They Start: A Quick Checklist

  • Licence number verified with Ministry of Environment
  • Inspection confirmed before treatment proposal
  • Specific pesticides identified and approved for residential use
  • Re-entry interval confirmed for children and pets
  • Exclusion work scope agreed
  • Guarantee terms in writing
  • Payment schedule agreed

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