A bee swarm in bird box or owl box tends to put off the intended tenants. A bird box makes an ideal home for a bee swarm and so is a common problem for owners. These bird and owl boxes are often put up in quiet places which the birds will like. Of course honey bees like those places too. They can build combs and fill them with eggs, brood, pollen and honey in quite a short time, often before they are noticed by the owner.
Removal of a swarm in bird box is relatively straightforward, although not usually done on site. If the box can be taken down, wrapped up in a netting bag, and taken away, the subsequent removal into a proper hive can be done at leisure by the beekeeper.
I usually like to carefully dismantle the box, cut out the honeycombs and suspend them in hive frames with plastic netting. The bees quickly repair any damage to the combs, fixing them into the wooden frames. After a few weeks the plastic netting can be carefully removed and the colony carries on in the hive quite happily.
This bird box had been occupied for some time. The bees had been working so hard that there was little room left for the bees themselves. When I opened the box, it was full of comb, which was then transferred to their new home.