18.97.030 Development standards.
A. Applicability. Where there is a conflict between these standards and standards elsewhere in the code, the cluster housing standards shall apply.
B. Permitted Housing Types.
1. Residential low density district: Units may be single-family detached or duplexes.
2. Residential medium density district: Units may be single-family detached, duplexes, or up to four units attached.
3. Residential high density district: Units may be single-family detached, duplexes or up to 12 units attached.
C. Dimensional Standards.
1. Maximum average gross floor area: 1,200 square feet per dwelling unit.
2. Maximum height for dwellings: 25 feet or two stories, whichever is less.
3. Units per cluster: There may be three to 12 units per cluster with no limit on the number of clusters per development.
4. Minimum Lot Size.
|
Minimum lot size for cluster development on a single lot |
Minimum lot size for development with individual lots |
|
|---|---|---|
|
RLD |
15,000 square feet |
2,000 square feet |
|
RMD |
10,000 square feet |
1,500 square feet |
|
RHD |
8,000 square feet |
1,500 square feet |
5. Minimum lot dimensions: Minimum lot width for individual lots shall be 20 feet, with a minimum lot depth of 50 feet.
6. Minimum setbacks from site perimeter: Same as the base zone.
7. Minimum setbacks for single-family and duplex dwellings on individual lots within a cluster housing development:
|
Setback |
|
|---|---|
|
Front |
10 ft. |
|
Porch or stairs |
5 ft. |
|
Side |
3 ft. |
|
Rear |
5 ft. |
8. Maximum building coverage: Same as the base zone.
9. Minimum distance separating dwelling units (excluding attached dwellings and accessory structures): six feet.
D. Density.
1. For developments in the RLD district: The minimum density shall be met as established in TMC 18.25.065(A). The maximum density shall be 21.6 units per acre.
2. For developments in the RMD district: The minimum density shall be met as established in TMC 18.30.065(A). The maximum density shall be 29 units per acre.
3. For developments in the RHD district: The minimum density shall be met as established in TMC 18.40.065(A). No maximum density standard applies.
4. For purposes of this section, density may be calculated based on the total development site acreage, after subtracting undevelopable land. No percentage reduction for infrastructure is required.
E. Open Space. Cluster housing developments shall provide and maintain at least one common open space per cluster for the use of all occupants. The open space shall have the following characteristics:
1. Located on land with less than a five percent slope.
2. Cleared sufficiently of trees, brush and obstructions so that recreational use is possible.
3. Not used for temporary or regular parking of automobiles or other vehicles.
4. Includes at least 150 square feet of area for each dwelling unit.
5. Provides at least 50 percent of open space in the form of a single compact, contiguous, central open space that:
a. Has a minimum dimension of 20 feet.
b. Abuts at least 50 percent of the dwellings in a cluster housing development.
c. Has dwellings abutting on at least two sides.
6. The common open space shall be developed with a mix of landscaping and lawn area, recreational amenities, hard-surfaced pedestrian paths, or a community building built for the sole use of the cluster housing residents. Impervious elements of the common open space, excluding community buildings, shall not exceed 30 percent of the total open space.
a. Shared nonrecreational facilities such as shared laundry or storage facilities shall not count towards the open space requirement.
7. If private open space is provided for dwelling units, it shall be adjacent to each dwelling unit. Private open space may include landscaping, porches and decks. The minimum dimension for private open spaces shall be 10 feet, except that porches shall have a minimum dimension of five feet.
F. Siding and Roofing Requirements. Cluster dwellings shall comply with siding and roofing standards in TMC 18.95.040.
G. Existing Dwelling Unit On-Site. One existing single-family dwelling incorporated into a cluster housing development that does not meet the requirements of this chapter is permitted to remain on a site developed for cluster housing and shall be considered a dwelling in the development. The existing single-family dwelling unit shall not be part of the average gross floor area calculations. [Ord. 966 § 3 (Exh. C), 2021.]