HomeMy WebLinkAboutPlanning 2017-10-26 Item 4 - Accessory Dwelling Unit Regulation - Attachment B: Comparison of City ADU StandardsComparison of Accessory Dwelling Unit Standards
City Min. Lot Size Max. Unit Size Height
Parking Requirement
Owner
Occupancy
Other Regulations
Fees
Tukwila
Attached
Only
smaller of 1/3 sf
of main house or
7,200 1,000 sf
NA
2 for main house, 1 for
ADU up to 600 sf, 2 for
ADU over 600 sf
Required
Incorporated into the primary single-family
residence so that both units appear to be of
the same design as if constructed at the
same time, Not sold as a condo, Detached
not permitted
None
Renton
Attached
and
Detached
smaller of 3/4 sf 30', but no
of main house or taller than
Same as zone 800 sf main house
2 for main house, 1 for
ADU
Required,
signed
affidavit,
notice on title
Conditional Use Permit, match main house,
Max 50 allowed per year in City, meet
impervious surface and building coverage
Admin
CUP
$1,500
Kent
Attached
and
Detached
Specific zoning
requirements of
each zone. ADU
in new
development
limited to 800 sf
or 33% of the
same as Zone principal home
23' but not to
exceed the
height of the
principal
building
2 for main house, 1 for
ADU
1 unit must be
owner
occupied for 6 Immediate neighbors of an ADU applicant
months of the will be notified of the pending ADU permit
year, Recorded within 15 days of the application being
covenant deemed complete.
Planning
Review
$93
SeaTac
Attached
and
Detached
Attached
NEW: 800 SF
EXISTING: 45% of
Same as the principal
Zone. 1 ADU home
per lot Detached 800 SF
20'
Parking for main house
by zone, 1 for ADU up
to 600 sf, 2 for ADU
over 600 sf
Must occupy
for at least 9
months,
affidavit and
documentatio
n of residency
required.
ADU must be registered with the City of
SeaTac. Occupancy limit of 2 people for 440
SF, 3 people for 600 SF, 4 people for 800 SF.
Waiver for additional parking requirements
can be granted if adequate street parking is
available. Impact fee is 60% of SF rate.
$129
N
City
Min. Lot Size Max. Unit Size
Height
Parking Requirement
Owner
Occupancy
Other Regulations
Fees
Burien
Attached
and
Detached
Same as
Zone. ADU
footprint no
more than Attached 1000 SF
15% of the Detached 800 SF,
total lot area Exceptions
or 80% of the possible for
main buildings at least
residence 5 years old
Lower of 10ft
above the
height of the
primary
existing
structure or
the max
allowed in the
zone
1 additional parking
space is required.
Parking should be on
the side or rear of the
building.
Required,
signed and
recorded
affidavit
Only 1 entrance per street front unless
hidden. Designed to match main building.
Non -conforming ADU's can apply to become
legal ADU's if they meet all requirements set
fourth in the BMC. No impact fees for ADUs.
None
Seattle (in SF Zone)
Attached Same as zone 1,000 sf
NA
1 for main house, 1 for
ADU, waiver is possible
Required,
signed
covenant
Max 8 residents on site unless all related. No
public comment period on application or
appeal allowed.
Duplex building standards for sound and fire
separation if new construction, Only 1 visible
entrance per street, Sewer capacity charge
for new connections.
$210 +
plan
review
fee
based
on value
of work
Detached
4,000 800 sf
1 for main house, 1 for
ADU, waiver is possible
Required,
signed
covenant
Entrance can't face nearest side yard or rear
unless on an alley. Not allowed in the
shoreline. Must pay sewer capacity charge.
Portland
Attached
smaller of 3/4 sf
of main house or
Same as zone 800 sf
NA
No additional for ADU
No
1 or more related persons plus up to 5
additional persons, Some utility hook up and
impact fees reduced or waived
Only 1 entrance on street fagade
smaller of 3/4 sf
of main house or
Detached Same as zone 800 sf
20' height
No additional for ADU
No
Smaller footprint than main house, 40'
setback from front lot line or behind the
house, design to match main house, Duplex
building standards if new construction