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Mason bees and Resin bees, both solitary. We have Carpenter bees though they are more destructive and I try not to give them homes.

You handle bees?

Nope, not any more. I live in a City of 210k. I used to live with some Bees though :]

@caalamus luckily solitary bees dont need as much space as honey bees. You can buy the bees and homes for them on ebay and I may start selling them as well.

Since mine dont produce honey I may just build a pollen traps for them as they do collect alot of pollen.