posted 9 years ago
trap-outs can be a good option, but it's really easy to screw them up. since it's an older established colony, its probably pretty big. big colonies can take in excess of nine weeks to get entirely out. and if any get back in during that time, you might reset the clock.
one major issue: all that comb will still be in there. at the very least, that means you absolutely need to let the bees rob all the honey out at the end of the process if you don't want the homeowner to curse your name later. it also means that wall will be extremely inviting to future swarms and so will need to be sealed up very well after it's all over to keep more bees from moving in.
like Tomas said, you'll need a queen in your bait hive. a comb of new eggs can work, too, but that might be a little trickier, especially in a Warré hive. I've done trap-outs into Warré hives, though, and they worked just fine. you'll want to consider the size of the colony, though. if you end up needing four boxes just to fit all the bees in... the smaller Spring population will certainly be an advantage there.