Mason bees are not mt thing but thislink may help. Here is a link that might be useful: Horn Face Bees

Echoes: 1) Height or width of the overall house isn't very important for the average residential gardener. What -is- important is tube diameter and the presence of orienting marks for the bees, like colored straw tips, or patches of color, or a few straws sticking out further than the rest. These bees like irregular surfaces with lots of identifying marks. They can see blue, yellow, green, and black. 2) Ideal placement is where 1) it will get sun in the morning to help the bees warm up for flight and 2) It's protected from weather. I live in Seattle and place my bees on the south side of the house because they get the most sun there (7 hours during the warmer part of the day) Our storms in Seattle come in from the south, so that also means the houses are exposed to a lot of rain and wind, which 1) encourages them to disperse (fly away and not return to nest there.) and 2)creates great moist conditions for pollen mites. That was a bad idea last spring, which was cold and wet and windy. This year I'm placing some houses on the south side of the house and some on the east side to see which perform best. The east side gets five hours of sunlight during a colder part of the day. For the ones on the south side, if we're in for stormy weather, I have two options: 1) build a more protective roof over each house or 2) Take the entire house (bees and all) and put it in a bag in the fridge for about 24 hours. SARE's guide to Alternative Pollinators says you can do this for up to five days with no harm to the bees. We'll see how that idea works out. :-)

I drilled holes in a block and mason bees used it until it got old and dirty. You might need to clean it somehow every year. I also used the cardboard tubes with the straw liners. The problem I had with that was trying to get the straws out to change them at the appropriate time, because the bees are very active and either haven't emerged yet or are already filling up holes. The straws seemed hard for me to pull out and put in. I've heard a solution, you take the old one down and put it somewhere that the bees can emerge but not find it to start filling it, but have a new setup for them. I've also heard if you find some bamboo of an appropriate diameter, you can cut lengths, tie them together, and the bees will like them. One problem I had was that I needed to take the filled house and store it in a sheltered place, refrigerator, or whatever over winter, one winter mine seemed to be killed off by too much cold or ? I kept putting out a new straw house and didn't seem to attract any new bees last year, but this year I think some are using it. There are other small native bees as well, like leaf-cutter bees, check google. I think they may also use mason bee houses.

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