Your farm starts off with a farm house, barn, crop field, and animal field. You can have Wilbur build up to two additional fields at the bazaar. The first field is 30,000 G, the next field is 60,000 G, and then you could have a greenhouse built in your basement for 100,000 G. There aren't any house upgrades in this game. There is also a windmill on the lower left of your farm, which you can use to process a lot of your farm's produce into things like Cheese, Butter, etc. This windmill is unlocked on Spring 23 of your first year.