There are a few different ways that you can get a Bee House; you can get one as a reward for completing the Fall Crops bundle in the Community Centre. To complete this bundle, you will need; 1x Corn, 1x Eggplant, 1x Yam, and 1x Pumpkin. You can also make your own Bee House once you receive the blueprint at farming level three and have 40x Wood, 8x Coal, 1x Iron Bar, and 1x Maple Syrup.