A thorough inspection needs to be carried out to determine the extent and source of the infestation.
It should be noted that there is no easy fix in eradicating bedbugs. There should be 2 treatments for every room. These are carried out about a month apart using different insecticidal groups.
The reason for failure is lack of thoroughness. If there is just 1 bedbug remaining after treatment, at whatever stage in its life cycle, then reinfestation will recur.
Bedding and clothing containing bedbugs is removed and bagged prior to cleaning. All areas are thoroughly vacuumed. Insecticide is then applied to floors, beds, curtains, walls, skirting boards and picture rails and any cracks and crevices. Even electrical sockets are removed and treated. The whole process is repeated one month later.
We would recommend that mattresses that have been infested with bedbugs are fitted with mattress encasements. These encasements will contain any bugs that remain on the mattress. Barrier devices are also available to prevent bedbugs climbing the bed legs.