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Title 17C
Chapter 17C.110
Section 17C.110.310
 

Title 17C Land Use Standards

Chapter 17C.110 Residential Zones

Section 17C.110.310 Attached Housing, Detached Houses on Lots Less than Forty Feet Wide, and Duplexes
  1. Purpose.
    Attached housing, detached houses on narrow lots and duplexes allow for energy-conserving housing and a more efficient use of land. See definition of attached housing under SMC 17A.020.010.


     
  2. Qualifying Situations.
    Sites located in the RA through the RHD zones. All lots must be under the same ownership or a signed and recorded agreement to participate in an attached housing development must be submitted to the City by all property owners at the time of building permit application.
     
  3. Lot Development Standards.
    Each house must be on a lot that complies with the lot development standards in the base zone as provided in Table 17C.110-3.
     
  4. Building Setbacks for Attached Housing.
    1. Interior Lots.
      On interior lots, the side building setback on the side containing the common wall is reduced to zero.
    2. Corner Lots.
      On corner lots, either the rear setback or non-street side setback may be reduced to zero. However, the remaining street side lot line setback must comply with the requirements for a standard side or rear setback.
  5. Design Standards.
    This section is subject to the provisions of SMC 17C.110.015, Design Standards Administration.
    1. A multi-family residential building of three or more units and attached housing in the RMF and RHD zones are subject to the design standards of SMC 17C.110.400 through 17C.110.465.
    2. For detached houses on lots forty feet or less wide and duplexes, where permitted, in the RSF, RSF-C, RTF, RMF and RHD zones, as well as attached housing in the RA, RSF, RSF-C, and RTF zones, the following design standards must be met:
      1. All street-facing facades must have landscaping along the foundation. There must be at least one three-gallon shrub for every three lineal feet of foundation. (R)
      2. Sixty percent of the area between the front lot line and the front building line must be landscaped. At a minimum, the required landscaped area must be planted with living ground cover. Up to one-third of the required landscaped area may be for recreational use, or for use by pedestrians. Examples include walkways, play areas, or patios. (R)
      3. Use of planting materials and landscape structures such as trellises, raised beds and fencing to unify the overall site design is encouraged, with plantings consistent with L3 open area landscaping standard of SMC 17C.200.030. (P)
      4. Front facade.
        Fire escapes, or exterior stairs that provide access to an upper level are not allowed on the front facade of the building. (R)
      5. Duplexes and attached houses on corner lots shall be designed so each unit is oriented towards a different street. This gives the structure the overall appearance of a house when viewed from either street. (R)
      6. Detached houses on lots forty feet or less wide and both units of a duplex or attached houses must meet the following standards to ensure that the units have compatible elements. Adjustments to this paragraph are prohibited, but modifications may be requested through a design departure. The standards are:
        1. Entrances. Each of the units must have its address and main entrance oriented toward a street frontage. Where an existing house is being converted to two units, one main entrance with internal access to both units is allowed. (R)
        2. Each unit must have a covered, main entry-related porch or stoop area of at least fifty square feet with no dimension less than five feet. (R)
        3. Buildings must be modulated along the public street at least every thirty feet. Building modulations must step the building wall back or forward at least four feet. (R)
        4. Reduce the potential impact of new duplex and attached housing development on established and historic neighborhoods by incorporating elements and forms from nearby buildings. This may include reference to architectural details, building massing, proportionality, and use of high-quality materials such as wood, brick, and stone. (P)
        5. Create a human scale streetscape by including vertical and horizontal patterns as expressed by bays, belt lines, doors and windows. (P)
      7. Garages are subject to the garage limitation standards of SMC 17C.110.208(E). (R)
      8. Where off-street parking for two or more dwellings will be developed on abutting lots that are each less than forty feet in width, only one curb cut and sidewalk crossing for each two lots may be permitted, to promote pedestrian-oriented environments along streets, reduce impervious surfaces, and preserve on-street parking and street tree opportunities. (P)
  6. Number of Units.
    1. RA, RSF and RSF-C Zones.
      A maximum of two houses may be with a common wall. Structures made up of three or more attached houses are prohibited unless approved as a planned unit development.
    2. RTF Zone.
      Up to eight attached houses may have a common wall. Structures made up of nine or more attached houses are prohibited unless approved as a planned unit development.
    3. RMF and RHD zones.
      There is no limit to the number of attached houses that may have common walls.

Date Passed: Monday, January 14, 2019

Effective Date: Wednesday, February 27, 2019

ORD C35730 Section 3