Good subject. I've got honey bees in my house from this last summer that I need to get rid of. One of those projects I really don't want to do as I don't like to be stung. I need to find a bee keeper that will take them as I really would prefer not to kill them. I most likely will need to access from inside rather than out as I have a flag stone exterior. I think a piece of Plexiglas over the hive would be cool but, they must go. I know a cleanup and repair will be necessary but, at this point how much damage can they do? Honey soaked walls? Not seen damage from honey bees so I'm not sure what I should expect.
I hope I can reset your expectations a bit. As beekeeper, I know the difference (and there's a big difference) between a SWARM of bees ON the wall and a COLONY of bees IN the wall. It's often unclear when I'm asked to drive over and take a look. If they really are in your walls, your best bet is to do one of the following (in order of effort)
1) Do nothing--As long as they're not getting in the house and causing issues.
2) Coax most of them out in the summer and remove them in the winter. If you have 1 hole where you know they're entering the wall you can put a bee escape where they can leave but can't go back in. Put a super with drawn frames and nearby or even better, directly connected to the wall. When the cold weather comes and it's gone according to plan, most of the bees and the queen will be in their new home. Move this hive and get ready to rip open the wall on a really cold morning.
3) Do everything in option 2 except kill them with Sevin powder in late summer.
4)Last resort. Kill them all in the heat of summer, rip open the walls and run the risk of every flying insect in the area coming in for the spoils.
WHATEVER YOU DO. Do not kill them, and try to seal up the hole. I'll explain later, but trust me, it's a bad idea for a bunch of reasons.
A cold winter day is the best time to do the wall repair because any bees that are alive will be too cold to move/fly/sting. Also, the combs and honey can mostly be chipped away, rather than becoming an oozing sticky mess. If your doing this from inside the house, you'll need to seal off that room and open all the windows so it gets as cold as possible. Once completely cleaned, top to bottom, apply a primer like Kilz. Then insulate and re-sheath and reside. (Or replace the interior dry
And that is reason why I keep my general contractors cards handy when I go on swarm calls.