The four major pests that are commonly found in homes and buildings are: Cockroaches - These are common household pests that can contaminate food, spread diseases, and trigger allergies and asthma. Ants - Ants are attracted to food and water sources in the home, and can quickly form large colonies that are difficult to eradicate. Termites - Termites feed on wood and other cellulose materials, causing significant damage to homes and buildings. Rodents - Mice and rats are common pests that can cause structural damage, contaminate food, and spread diseases. Preventing these pests from entering your home is key to avoiding infestations. This can be achieved by keeping your home clean and free from clutter, sealing any cracks or gaps in the walls or foundation, and storing food in sealed containers. If you do experience a pest problem, it is best to contact a professional pest control company to safely and effectively eradicate the infestation.