Bedrooms are the principal locations for bed bugs; however, any room where people sleep in the home may provide harborage for bed bugs. Living rooms with sofas and sofa beds are the next most common sites for bed bugs. Typically an infestation starts in one room and spreads slowly to other places where people sleep.

While a bed bug infestation typically starts in a single room (usually the bedroom), it is rare for them to stay confined to just one area for long. Bed bugs are nocturnal "hitchhikers" that move via laundry, luggage, and furniture. If you discover them in one room in 2026, they have likely already traveled to other areas where people spend long periods sitting or sleeping, such as the living room sofa or an adjacent bedroom. Bed bugs can travel over 100 feet in a single night through wall voids, electrical outlets, and baseboards in search of a meal. While an early-stage infestation might be concentrated in one mattress, the "Golden Rule" for 2026 pest control is to inspect the entire home. Treating only the "infested" room often leads to a resurgence, as even a single surviving pregnant female in the next room can restart the entire colony within a matter of weeks.