All residential dwellings may have fences and gates between the dwelling and a side wall, positioned at or behind the front of the structure. The maximum height allowed for such fence and gates is the height of the abutting side or rear yard wall or six feet (6'), whichever is less, provided however, if the property has an extension to an abutting rear or side yard wall, the height for a fence and gate abutting such rear or side wall may be the same, not to exceed eight feet (8'). Such fences may be constructed of rock and mortar, wood, chain-link fencing, wrought iron or commercially-available pre-fabricated fencing, provided however, the fences shall be constructed of the same materials contained in a rear yard fence extension if one exists that was installed by or on behalf of any owner of the property, or a material of the same or similar color and appearance, unless rock and mortar is used. Gates may be constructed of wood, chain-link fencing, wrought iron or commercially-available pre-fabricated fencing. Provided however, the materials used for the gates shall be the same as that of the abutting fence or fence extension of a rear yard fence if one exists that was installed by or on behalf of any owner of the property, or a material of the same or similar color and appearance, unless the extension is constructed of rock and mortar or wrought iron is selected for use in the gates.