Rodent control is the area where the gap between a good pest control company and a mediocre one shows most clearly — because the right approach requires exclusion work (physically sealing the building), not just bait or traps. A company that treats the infestation but doesn’t address entry points is selling you a temporary reduction in the existing population. New rodents will enter through the same gaps within weeks.
“The single most important question in rodent control is: are you sealing the entry points? Because if you’re not, you’re not actually controlling rodents — you’re managing an ongoing population that’s constantly being replenished from outside. Bait and traps reduce the population inside. Exclusion is what makes the solution permanent. Any company that doesn’t lead with exclusion in their rodent proposal isn’t giving you a complete solution.”
— Renata Voss, licensed exterminator and integrated pest management specialist with 14 years of experience in residential and commercial pest control in the local area
Table of Contents
Questions About the Inspection
Will you perform a thorough exterior inspection to identify entry points?
Mice can enter through gaps as small as 6mm — the diameter of a pencil. Rats need a slightly larger gap. Common entry points include:
- Gaps around plumbing and electrical penetrations through foundation walls and exterior walls
- Gaps under doors and around door frames
- Gaps around window frames and weep holes
- Foundation cracks
- Gaps where utilities (cable, gas, telephone) enter the structure
- Gaps under garage doors
- Vents without adequate screening (dryer vents, bathroom exhaust vents, attic vents)
Ask the company to perform and document an exterior inspection specifically looking for rodent entry points.
What a good answer looks like: A described exterior inspection process with a written list of identified entry points provided to the homeowner.
Will you also inspect the interior for signs of activity and harborage?
The interior inspection should identify:
- Where droppings are concentrated (indicates high-activity areas near nest sites)
- Evidence of gnawing on food packaging, wiring, or structural materials
- Nesting material (shredded paper, insulation, fabric)
- Travel paths (rodents use the same routes repeatedly and leave grease marks along walls)
What a good answer looks like: A systematic interior inspection with findings documented.
Can you distinguish between mice and rats — and does it matter?
Yes, it matters. Mice and rats have different behaviors, different entry point sizes, different bait preferences, and different control approaches. Ask the company to confirm specifically whether this is a mouse problem, a rat problem, or both — and how the treatment approach differs.
Questions About Exclusion
Will exclusion work (sealing entry points) be performed, or recommended?
This is the most important question in rodent control. Ask specifically whether the company performs exclusion as part of their service, and if not, whether they’ll provide you with a written list of entry points that need to be sealed and by whom.
What a good answer looks like: Exclusion work is either performed by the company as part of their service, or a specific referral and list of entry points is provided.
What materials are used for exclusion?
Rodents can chew through many materials. Ask what materials will be used to seal entry points:
Effective materials:
– Galvanized steel mesh / hardware cloth: 1/4″ mesh stops mice; 1/2″ mesh stops rats. Used to cover vents, gaps around pipes, and larger openings.
– Steel wool combined with caulk: Useful for smaller gaps. The steel wool prevents gnawing through the caulk; the caulk seals around the steel wool.
– Sheet metal flashing: For gaps along foundations, under doors, and at corners.
– Concrete or mortar: For foundation cracks and larger voids.
Materials that don’t work:
– Foam insulation alone (rodents chew through it easily)
– Plastic mesh (too easy to gnaw through)
– Standard caulk alone (gnawed through easily)
Ask specifically what materials will be used and confirm they’re appropriate for rodent exclusion.
Questions About Treatment
What bait or traps are being used, and where will they be placed?
Ask specifically:
Bait stations: Rodenticide bait in tamper-resistant stations. Effective but requires multiple visits to service. Ask where stations will be placed (interior, exterior, or both) and whether they’re tamper-resistant (required if children or pets are present).
Snap traps: The most effective mechanical method for mice. Immediate kill, easy to verify. Used inside, often along wall runs.
Glue boards: Less humane, and less effective for rats. Not recommended when non-target animals (pets) may be present.
Live traps: Used in some situations, but require daily checking and the relocated rodents often return.
Ask specifically what the treatment strategy is and how bait stations or traps will be monitored.
What is the risk to non-target animals (pets, wildlife)?
Rodenticide bait can be dangerous to dogs, cats, and predatory wildlife (raptors, foxes) that may eat poisoned rodents. Ask specifically:
- Are tamper-resistant bait stations being used?
- What rodenticide is being used (first-generation or second-generation anticoagulant)?
- Second-generation anticoagulants (brodifacoum, bromadiolone) accumulate in rodents’ bodies and can kill predators that eat them (secondary poisoning) — ask whether first-generation or non-anticoagulant products can be used instead.
What a good answer looks like: Tamper-resistant stations specified, and the company willing to discuss the rodenticide choice with you in the context of your household and wildlife in your area.
Questions About Follow-Up
How many return visits are included, and how often?
Rodent control is not a one-visit service. Ask specifically:
- How many return visits are included?
- How often will bait stations be checked and serviced?
- When is the job considered complete — what does success look like?
What a good answer looks like: A schedule of return visits (typically every 2–4 weeks) with defined completion criteria (no new activity for a defined period after all entry points are sealed).
What does the guarantee cover?
Ask specifically: if rodents return within the guarantee period, is re-treatment included at no charge? Does the guarantee apply after exclusion is complete, or from the date of initial treatment?
Related Questions
- Questions to Ask a Pest Control Company Before You Hire One
- Questions to Ask a Pest Control Company About Treatment Methods
- Questions to Ask a Pest Control Company About Guarantees and Follow-Up
- Red Flags When Hiring a Pest Control Company
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