Upper Darby's housing stock shapes exactly where rodents get in. A blend of dense urban rowhome construction and larger suburban single-family homes, nearly all with basements. Combined with the area's climate — a humid subtropical-leaning climate with hot, humid summers and cold, if generally milder-than-northern-PA, winters — rodents seeking shelter from weather extremes make a beeline for any accessible gap.
Exclusion is the core of effective rodent control: finding and sealing every gap a mouse or rat could use to get inside, since traps alone just remove the current population without stopping the next one. We pair exterior sealing with interior trapping or bait stations, then follow up to confirm the problem is resolved.