Sammamish Unified Development Code

Environment & Sustainability | Environmentally Critical Areas

i. If the existing legally created single detached dwelling unit(s) and accessory dwelling unit(s) and associated impervious surfaces are located within the building setback or buffer required for a landslide hazard area, a critical areas study must be supplied consistent with the provisions of SDC 21.03.020K.3. and approved by the City that demonstrates that there will be no increased risk to life or property by the proposed footprint expansion; ii. If the existing legally created single detached dwelling unit(s) and accessory dwelling unit(s) and associated impervious surfaces are located over or within a wetland, stream, or landslide hazard area, no further expansion within the wetland, stream, or landslide hazard area is allowed; and iii. If an existing legally created single detached dwelling unit and an accessory dwelling unit and associated impervious surfaces are located within the building setback or buffer for a stream or wetland, or within a fish and wildlife habitat conservation area: a) No portion of the modification, addition or replacement may be located closer to a wetland or stream than the nearest extent of the existing single detached dwelling unit, except as provided under subsection 2.b.iii.(B) of this section. b) When there is an intervening single detached dwelling unit(s) or accessory dwelling unit(s) on a perpendicular line in between the subject wetland or stream and a single detached dwelling unit or accessory dwelling unit that is

proposed to be modified, added to, or replaced, the modification, addition or replacement may be located closer to the wetland or stream, provided no portion of the modification, addition or replacement is located closer than 50 feet to the wetland or stream. c) Modifications, additions, or replacements authorized under this subsection shall meet the following criteria: 1) A critical areas study approved by the City demonstrates a net improvement in hydrologic and habitat values to the subject affected wetland, stream, fish and wildlife habitat conservation area through restoration of degraded areas and/or buffer or through provision of additional vegetated buffer; and 2) Mitigation of impacts to disturbed critical areas or buffers is provided in accordance with this chapter. c. Expansions of Buildings in Commercial Zoning Districts. Structural modification of, addition to, or replacement of legally created buildings and associated impervious surfaces located in the community business, neighborhood business, office, and Town Center A zones, that do not meet the applicable building setback or buffer requirements for wetlands, streams, fish and wildlife habitat conservation area, or landslide hazard areas are allowed a one-time up to 1,000 square foot increase in the existing total footprint of the building

64 | Title 21: Sammamish Development Code

Effective | January 1, 2022

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