The are two main methods for the removal of bees. The type of bee and their location will inevitably determine which is to be used. Bumble bees can only be extracted using the cut-out process. Both cut-out and trap-out methods can be used for honey bees.
Cut-out involves exposing the colony and physically removing it from its established site. The bees and the comb are physically moved into a nucleus hive and relocated to a suitable location once the works have been completed.
Trap-out uses techniques to prevent bees re-entering the colony after they have left and providing them with an alternative home which can be relocated to a suitable location once the works have been completed.
Both of the methods have pros and cons. Each situation is different and therefore will require discussions with individual clients as to the best way forward for their particular circumstances.
It is possible that in some instances that it would be beneficial to use a combination of both methods. A trap-out may help to reduce the number of bees in a large colony prior to undertaking a cut-out.