Yes, bees can cause damage. Bees can make honey in structures that can seep through walls, ceilings, light fittings etc. This can cause mould, rotting, smells, and attract other insect and rodents that might become a bigger problem in the future. It is better to take care of the problem before it becomes a bigger issue. Call us as soon as you are aware of the bees, the longer you leave it the more challenging the removal will become.