What you'll need

Tick them off as you find them.

1 untreated cedar 1x8 x 4 ft (actual 3/4 x 7 1/4 in)Find it →
1 1/2 in galvanized nails or exterior screwsFind it →
Paper nesting tubes or liners, 5/16 in across and 6 in long, enough to fill the box snuglyFind it →
2 exterior screws for mountingFind it →

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How to make it

Safety

Wear safety glasses while cutting and nailing, and hang the house away from doorways so bees have a quiet flight path.

1
Cut the pieces
Cut a bottom at 5 in, 2 sides at 8 in, a top at 8 in and a back at 9 in.
2
Build the box
Nail the 2 sides onto the ends of the bottom, making a U. Nail the top across the sides so it overhangs a little on each side.
3
Add the back
Nail the back onto the back edges. The open front faces out.
4
Pack the tubes
Fill the box with nesting tubes, open ends facing out, pushed all the way to the back. The deep box shades them from rain.
5
Hang it
Screw it to a wall or post 3 to 6 ft up, facing east or southeast for morning sun. Put it up in early spring before fruit trees bloom.
6
Offer mud
Keep a patch of bare, damp soil nearby. Mason bees seal their tubes with mud.