Minimum lot area and lot width regulations in any zone shall not apply to repeater, booster, transformer, or switching stations, or dial offices.

In any district wherein a single-family dwelling is permitted, such dwelling may be permitted on any lot or parcel which is of official record by deed or a subdivision duly recorded in the plat records of Carroll County as of the effective date of this chapter, provided:

In any district except the C Conservation District, where dwellings are permitted, if neither a public water supply or sewerage system is accessible or if an acceptable community water supply or sewerage system is not to be provided, the minimum lot size shall be 20,000 square feet and 100 feet in width, subject, however, to the requirements of the Maryland State Department of Health.

Except in a C Conservation or R-20,000 Residence District, if a public water supply is accessible and individual lot sewerage facilities are approved, the minimum lot size for a dwelling shall be 15,000 square feet, with 100 feet width at the building lines, subject, however, to the requirements of the Maryland State Department of Health.

If attached to the main building, a carport or a one-story open porch, with or without a roof, may extend into any required yard not more than 25% of the minimum required depth of a front or rear yard or of the minimum required width of a side yard.

Projections such as bay windows, chimneys, entrances, vestibules, balconies, eaves and leaders may extend into any required yard not more than four feet, provided that such projections (excepting eaves) are not over 10 feet in length.

Fences and walls shall be exempt from building lines and yard requirements unless obstructions to vision.

Building height limitations shall not apply to water tanks, barns, windmills, silos, or other accessory farm structures; or to belfries, steeples, spires, electric or communication poles or towers, electric generating plants, electric transforming or switching equipment, radio, television or radar towers, chimneys or smokestacks, flagpoles, fire or observation towers, cupolas, domes, monuments, penthouses, or roof structures for housing stairways; or to tanks, ventilating fans, air-conditioning equipment or similar equipment required to operate and maintain the building. No penthouse or roof structure shall have a total area greater than 25% of a roof area, nor shall such structure be used for any purpose than a use incidental to the main use of the building.

In any R or B District, the height of a building may be extended to three stories, but not over 40 feet, if each side yard is increased in width 1/2 foot for each additional one foot of height above the normal maximum limit.

On any lot where the average finished slope adjoining the building exceeds 7% grade, one story in addition to the number permitted in the zone in which such lot is situated shall be permitted on the downhill side of any building erected, but the building height limit shall not otherwise be increased above that specified for the zone.

In any zone where public or quasi-public buildings are permitted such buildings may be erected to a height of 120 feet, but the minimum front, rear, and side yards shall be increased one foot for each foot of height above the limit established for the zone in which the building is erected.