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Local governments planning under the GMA are required to plan for ensuring the vitality and character of established residential neighborhoods, as well as providing for the existing and projected housing needs of all economic segments of the community. This can be a significant challenge for many jurisdictions. Examples of tools to achieve those goals include planning policies, regulations, and design guidelines.
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Accessory Dwelling Units
Allowing the development of
accessory units is a technique for
providing affordable housing which
uses surplus space in existing
single-family homes. An accessory
dwelling unit is an additional living
unit, including separate kitchen,
sleeping, and bathroom facilities,
attached or detached from the
primary dwelling unit, on a
single-family lot.
Attached units, contained within a
single-family home, know variously
as a "mother-in-law apartments,'
"accessory apartments," or "second
units," are the most commonly
encountered type of accessory
dwelling unit. Accessory apartments
typically involve the renovation of a
garage, basement family room,
attached shed, or similar space in a
single-family home.
Less common are detached
"accessory cottages" or "echo
homes," which are structurally
independent from the primary
residence. These units, typically
placed in the rear yard area, are
usually constructed or installed for
the purpose of providing for an
elderly parent being cared for the
their adult children living in the
primary unit. Accessory cottages are
less frequently allowed in zoning
codes and are generally more
expensive to build than accessory
apartments. [Accessory Units: An
increasing Source of Affordable
Housing, p. 5]
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Adaptive Reuse
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Cluster Subdivision
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Density Bonus
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Featured Case Study

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Cambridge Court (Bellevue)
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20 units of senior rental housing on
land owned by a
church...
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» View Case Study
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