A permit is not required but compliance with the following is:
Fences in front yards. No fence, wall or hedge over four feet in height shall be permitted in any required front yard area, except wire mesh or other material providing at least fifty-percent open construction.
On a corner lot no fence, wall, hedge or other structure or planting shall be allowed in excess of three feet in height above the street level within the triangular area formed by the intersecting curb lines and a straight line joining said curb lines at points 20 feet from the point of intersection. This does not apply in a commercial or business district where no front yard is required.