I don't know the norm, especially in your area. But I have heard of people renting out church kitchens. If you belong to a church you might try that route. You may even get a good rate if you are a member. I've thought of doing this myself, but I don't do enough business to rent out a kitchen. To rent a kitchen for just one or two cakes, I'd have to charge way more than my cakes are worth. I'd like to be legal, but for now I'm kind of stuck. My state doesn't support home bakery licenses. It has to be done locally, and the requirements are impossible for me to meet.
It is unfortunate that there isn't such thing as a special "Home Kitchen" license. I've worked my way through college in restaurants and I can guarantee that my kitchen is cleaner than a lot of businesses out there! If you've never worked in a restaurant, even the ones that get 90 and above, you'd be shocked. I may not have a mop sink and a separate entrance, but there are no bugs, rodents, or grease ridden walls!