We've had one extra chicken on the sly for a few months... No one noticed an extra brown bantam in a tree filled and fully fenced yard. But then the neighbors moved away and left their two hens with us. So we checked the codes and rebuilt our coop larger in preparation for applying for the permit. Literally the day after we put the last nails in the coop, a code inspector was checking the house Next Door for rats, new tenants sueing landlord called him, and the inspector peeks through my fence and sees the five hens and 3 ducks. I know this because the day after I applied for the permit I got a letter in the mail with an official complaint and instructions to apply for a permit. In those instructions ( and no where else in the code that I could find) was it made explicitly clear that we are allowed 3 birds total of a combination of hens, ducks, geese, turkeys - not 3 of each. News to me. The inspector was really cool though. The law says you need the permit first, but the enforcement office just wants the fee and for your setup to be correct. Another point the inspector hit on, the birds are supposed to be in a fully enclosed run At All Times unless supervised. Free ranging is against the code but tolerated in practice so long as no one complains. So during your inspection period ( when the inspector may show up at any time) keep them in their run. The inspectors' main concerns are 1) the 15 ft setback from habitable structures, 2) the birds can't escape your fenced yard, 3) you don't leave feed or food scraps out, 4) you have enough litter & mulch to suppress flies, 5) the birds are fully confined in a run during the actual inspection ( which may happen when you aren't there). The fine for having more than 3 poultry without being able to meet permit requirements is $500 per day until you fix the problem. If you apply for a permit or are in the process of trying to meet the standards, they'll work with you without charging you the fine. They said they rarely deny a permit. We're getting permitted for 12 birds, just in case we want more later.