Mouse Control in Kent WA

House mice enter Kent, WA homes every autumn through gaps as small as 6mm — the width of a pencil. A single pair discovered indoors in September can become a population of 50 or more by January without intervention. Guardian eliminates active mouse populations through snap trapping, seals all entry points permanently with galvanized steel and expanding metal foam, and backs every exclusion job with a lifetime warranty.

The House Mouse in Washington Homes

The house mouse (Mus musculus) is the most common rodent pest in Kent, WA and throughout Washington state. It weighs 12 to 30 grams, is grey-brown with a lighter underbelly, and has large ears relative to its body size. It is an exceptional climber, jumper, and swimmer. House mice nest inside wall cavities, beneath kitchen appliances, in drawer insulation, and inside stored cardboard in garages and basements.

Reproduction Rate: Why Speed Matters

A single female house mouse reaches reproductive maturity at five to six weeks of age and produces litters of four to eight young every three weeks. A breeding pair left untreated through autumn and winter can produce 50 to 60 offspring in a year. That number compounds rapidly because the offspring themselves begin breeding within weeks. A small entry point left unsealed in October is often a significant infestation by December. Early intervention — at the first sign of droppings, gnaw marks, or noise in the walls — is always more economical than late-stage elimination.

What Mice Gnaw — Including Wiring

Mice gnaw continuously to wear down their ever-growing incisor teeth. They gnaw on food packaging, structural wood, pipe insulation, and electrical wiring. Gnawed electrical wiring is a documented house fire risk. The EPA rodent control guidance for consumers identifies wiring damage as one of the primary structural risks from uncontrolled mouse infestations in residential buildings.

The 6mm Entry Point Problem

The standard of professional mouse exclusion is the 6mm gap — the smallest opening a house mouse can compress its body through. This threshold is much smaller than most homeowners expect and smaller than most DIY-grade gap fillers adequately address. Gaps at this scale exist around pipe penetrations through drywall, at the junction of siding and foundation, under garage doors with worn weatherstripping, at the corner of window frames, and along door thresholds with deteriorated sweeps.

Guardian inspects at the 6mm threshold, not just the obvious large gaps. This precision is what the lifetime warranty is built on — we only warrant what we have actually sealed to the correct standard.

Why Poison Bait Is the Wrong Tool Indoors

Interior rodenticide bait stations cause mice to consume the product inside the structure and then die in inaccessible locations — inside wall cavities, beneath flooring, and within the insulation of HVAC ducts. Decomposition in an enclosed space produces a persistent odour lasting two to four weeks and, in some cases, attracting secondary pests. Guardian does not use interior rodenticide bait as a primary treatment tool. Snap trapping produces controlled, locatable carcass removal before decomposition occurs. WSU Extension rodent management guidance and King County Public Health both endorse trapping as the primary residential control method for this reason.

Guardian’s Mouse Control Process

Full Structural Inspection

The technician inspects the exterior foundation perimeter, garage door threshold, utility penetrations, crawl space access, and roofline where applicable. Entry points are photographed and documented in the written service report provided after every visit.

Active Population Elimination

Snap traps are set at documented activity points — along active runways identified by droppings and grease marks, near nest sites, and at interior entry locations. Traps are checked and cleared on a scheduled return visit. The population is confirmed eliminated before the exclusion seal-up is completed.

Exclusion Sealing — Lifetime Warranty

All identified entry points are sealed with 19-gauge galvanized steel hardware cloth, expanding metal foam, metal flashing, or a combination of materials appropriate to the gap type and location. Steel and metal foam are the only materials that resist mouse gnawing over the long term. Spray foam alone and steel wool alone are not durable exclusion materials. Guardian uses industry-standard materials, documents every sealed point, and backs the work with a lifetime warranty.

Rat Control in Kent WA

House mouse and Norway rat infestations can occur simultaneously in the same property — mice accessing wall cavities above, rats burrowing beneath the foundation below. Where mouse activity has been confirmed on the ground floor or in the kitchen, an exterior rat inspection is recommended as part of the same visit. Guardian’s rat control in Kent addresses Norway and roof rat entry separately from mouse exclusion, with the same lifetime warranty on all sealed points.

House Mouse Identification Guide

House mice and deer mice are both present in South King County and differ in their hantavirus risk profile. House mice are the dominant interior pest; deer mice are primarily associated with crawl spaces and outbuildings. The house mouse identification guide covers size, colouring, ear size, and droppings characteristics that distinguish house mice from deer mice and juvenile rats found in Kent structures.

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Guardian Pest Control | Licensed by the Washington State Department of Agriculture | Serving Kent, WA and South King County