Well, apparently no permits at all are required for the following erections, so there.
"Erection of utility buildings with floor area of less than 200 square feet, without utilities, on single-family or duplex premises
Erection of patio covers with an area less than 200 square feet on single-family or duplex premises (may not be within a front yard setback or side yard setback area)
Erection of fences not over four feet high in a front yard, nor over six feet elsewhere
Erection of carports of 200 square feet or less that are accessory to single-family or duplex dwellings (may not be within a front-yard front yard setback or side yard setback )
Erection of retaining walls which are not over four feet in height measured from the bottom of the footing to the top of the wall"