Residential Zones

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R-O-S: Reserved Open Space

Provides for permanent maintenance of certain areas of land in an undeveloped state, with the consent of the property owners; encourages preservation of large area of trees and open space; designed to protect scenic and environmentally sensitive areas and ensure retention of land for nonintensive active or passive recreational uses; provides for very low density residential development and a limited range of public, recreational, and agricultural uses.

Minimum lot size - 20 acres*
Maximum dwelling units per net acre - 0.05

* Except for public recreational uses, for which no minimum area is required.

O-S: Open Space

Provides for areas of low-intensity residential (5 acre) development; promotes the economic use and conservation of land for agriculture, natural resource use, large-lot residential estates, nonintensive recreational use.

Standard lot size - 5 acres
Maximum dwelling units per net acre - 0.20

R-A: Residential-Agricultural

Provides for large-lot (2 acre) residential uses while encouraging the retention of agriculture as a primary land use.

Standard lot size - 2 acres
Maximum dwelling units per net acre - 0.50

R-E: Residential-Estate

Permits large-lot estate subdivisions containing lots approximately one acre or larger.

Standard lot size - 40,000 square feet
Maximum dwelling units per net acre - 1.08
Estimated average dwelling units per acre - 0.85

R-R: Rural Residential

Permits approximately 1 half-acre residential lots; subdivision lot sizes depend on date of recordation; allows a number of nonresidential special exception uses.

Standard lot size - 20,000 square feet

15,000 square feet if recorded prior to February 1, 1970
10,000 square feet if recorded prior to July 1, 1967

Maximum dwelling units per net acre - 2.17
Estimated average dwelling units per acre - 1.85

R-80: 1 Family Detached Residential

Provides for variation in the size, shape, and width of subdivision lots to better utilize the natural terrain and to facilitate planning of single-family developments with lots and dwellings of various sizes and styles.

Standard lot size - 9,500 square feet
Maximum dwelling units per net acre - 4.5
Estimated average dwelling units per acre - 3.4

R-55: 1 Family Detached Residential

Permits small-lot residential subdivisions; promotes high density, single-family detached dwellings.

Standard lot sizes - 6,500 square feet
Maximum dwelling units per net acre - 6.70
Estimated average dwelling units per acre - 4.2

R-35: 1 Family Semidetached, & 2 Family Detached, Residential

Provides generally for single-family attached development; allows 2 family detached; Detailed Site Plan approval required for lots served by private rights-of-way.

Standard lot sizes - 3,500 square feet for 1 family, semi-detached

7,000 square feet for 2 family, detached

Maximum dwelling units per net acre - 12.44
Estimated average dwelling units per acre - 8.5

R-20: 1 Family Triple-Attached Residential

Permits single-family detached, semidetached and triple-attached and townhouse development. Detailed Site Plan approval required for townhouses.

Standard lot sizes - 3,200 square feet for end lots

2,000 square feet for interior townhouse lots

Maximum triple-attached dwellings per net acre - 16.33
Maximum townhouses per net acre - 6.0 (same as R-T)
Estimated average triple-attached dwelling units per net acre - 11

R-T Zone: Townhouse

Permits 1 family detached and attached, 2 family, and 3 family dwellings; promotes the maximum amount of freedom in the design of attached dwellings and their grouping and layout; Detailed Site Plan approval required for attached dwellings.

Standard lot size per attached dwelling - 1,800 square feet
Maximum dwelling units per net acre - 3 family dwellings - 9

2 family dwellings - 8
Other attached dwellings - 6

Minimum area for development - 2 acres

R-30: Multifamily Low Density Residential

Provides for low density garden apartments; single-family detached; single-family attached, 2 family and 3 family dwellings in accordance with R-T Zone provisions; Detailed Site Plan approval required for multifamilly and attached dwellings.

Standard lot size - Garden apartments - 14,000 square feet

2 family dwellings - 1,500 square feet
Other attached dwellings - 1,800 square feet

Maximum dwelling units per net acre - Garden apartments - 10

3 family dwellings - 9
2 family dwellings - 8
Other attached dwellings - 6

R-30C: Multifamily Low Density Residential-Condominium

Same as R-30 above except ownership must be condominium, or development in accordance with the R-T Zone; Detailed Site Plan approval required for multifamily and attached dwellings.

Standard lot size - Garden apartments - 14,000 square feet

2 family dwellings - 1,500 square feet
Other attached dwellings - 1,800 square feet

Maximum dwelling units per net acre - Garden apartments - 12

3 family dwellings - 9
2 family dwellings - 8
Other attached dwellings - 6

R-18: Multifamily Medium Density Residential

Provides for multiple family (apartment) development of moderate density; single-family detached; single-family attached, 2 family and 3 family dwellings in accordance with R-T Zone provisions; Detailed Site Plan approval required for multifamily and attached dwellings.

Standard lot size - Apartments - 16,000 square feet

2 family dwellings - 1,500 square feet
Other attached dwellings - 1,800 square feet

Maximum dwelling units per net acre - Garden apartments and 3 family dwellings - 12

Mid-rise apartments (4 or more stories with elevator) - 20
3 family dwellings - 9
2 family dwellings - 8
Other attached dwellings - 6

R-18C: Multifamily Medium Density Residential-Condominium

Same as above except ownership must be condominium, or development in accordance with the R-T Zone; Detailed Site Plan approval required for multifamily and attached dwellings.

Standard lot size - Apartments - 1 acre

2 family dwellings - 1,500 square feet
Other attached dwellings - 1,800 square feet

Maximum dwelling units per net acre - Garden apartments - 14

Mid rise apartments (4 or more stories with elevator) - 20
3 family dwellings - 9
2 family dwellings - 8
Other attached dwellings - 6

R-10A: Multifamily, High Density Residential-Efficiency

Provides for a multifamily zone designed for the elderly, singles, and small family groups. Detailed Site Plan approval required for buildings 110 feet in height or less; special exception required for buildings over 110 feet in height.

Minimum lot size - 2 acres
Maximum dwelling units per net acre - 48 plus one for each 1,000 square feet of indoor common area for social, recreational, or educational purposes

R-10: Multifamily High Density Residential

Provides for suitable sites for high density residential in proximity to commercial and cultural centers; also permits single-family detached dwellings.
Detailed Site Plan approval required for buildings 110 feet in height or less; special exception required for buildings over 110 feet in height.

Minimum lot size - 20,000 square feet
Maximum dwelling units per net acre - 48

R-H: Multifamily High-Rise Residential

Provides for suitable sites for high density, vertical residential development; also permits single-family detached dwellings; Detailed Site Plan approval required for multifamily dwellings.

Minimum lot size - 5 acres
Maximum dwelling units per net acre - 48.4

[1] Definitions

Minimum or Standard lot size: The current minimum net contiguous land area required for a lot.

Average dwelling units per acre: The number of dwelling units which may be built on a tract-including the typical mix of streets, public facility sites and areas within the 100-year floodplain-expressed as a per-acre average.

Maximum dwelling units per net acre: The number of dwelling units which may be built on the total tract-excluding streets and public facility sites, and generally excluding land within the 100-year floodplain-expressed as a per-acre average.

Residential Zones