In Michigan, you'll need a permit, and inspection. a $ 15.00 plus $ 60.00 dollar fee. If you've never done any work in that city add $20.00 for registration. Add the minimum charge of $ 200.00 for any service. and the customer gets a great deal for under $300.00 The State also requires you to warranty the work for a year and a half. In my experience, some times, you have to turn new customers away when they want little things done. Unless is a referral and the Customer wants it done right away.