Worker ants are 4-5mm in length but the Queen can be as big as 15mm. Queens lay their eggs in the spring in nests that are typically in soil but can be in brickwork or under bark. Garden Ants are attracted to sweet foods and leave a pheromone trail back to their nests for other ants to follow to the food source.
The majority of black or garden ants will only come into your home to forage for food and are attracted by sweet and sticky substances. Ensure that there is no readily available food source in your home.
You can help prevent Ants entering your home by sealing access points such as cracks and crevices in door and window frames.
IDM are very experienced in locating the source of ant intrusions and dealing with them effectively.