I do live in Olathe and from what I've read online about the city ordinances, chickens are considered "farm animals" and would require a SUP. The process of which is tedious, lots of paperwork, court appearance, $377 fee. And if it's approved, you only have the permit for a year. You must reapply every year, which includes a 70 fee. On top of that, your permit can be challenged at any time, by anyone. If a neighbor complains, it could be revoked.