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Utility plan that shows the following:
Property lines and corners with dimensions of parcel and adjacent streets and alleys,
Sewer line existing and proposed with distances from property lines and structures on the property,
Water lines existing and proposed with distances from property lines and structures on the property,
Electrical service lines existing and proposed with distances to structures on the property,
Garbage can locations on the property,
Storm Water evaluation requires calculations for all impervious surfaces since January 1, 2003. This includes
new structure footprint, concrete pathways, driveways being installed, and other impervious surfaces.
Other utility locations. Like gas service, if applicable.
Energy meeting Washington State Energy Code requirements including:
Additional energy credits,
Insulation at walls, ceiling, floor, slab and slab edges,
Glazing U-values.
Electric resistance heating will require inverter-driven ductless mini-split system heatpump in the largest zone
of ADU. This is not required if it can be shown the heating capacity of 2kW or less for the ADU.
Additional energy code information is available online here: Energy
PDF file name: Energy Code Forms
Stormwater Site Plan (SSP), if more than 2,000 sq ft of new impervious surfaces since January 1, 2003 or
grading more than 50 cubic yards. PDF file name: SSP
Stormwater Pollution Prevention Plan (SWPPP), if more than 2,000 sq ft of new impervious surfaces since
January 1, 2003 or grading more than 50 cubic yards. PDF file name same: SWPPP
One hour fire rated separation between the two attached dwelling units.
One hour fire rated walls required at supporting structure, unless automatic fire sprinkler system installed.
Listed fire rated assembly and opening limitations are required for structures within 10 feet.
Listed fire rated assembly and opening limitations are required within 5 feet of property line.
If approved owner occupy agreement is completed and interconnected smoke and carbon monoxide
detectors are installed, then an attached ADU will not require fire separation between the units or supporting
structure.
Other common items include:
For amnesty of existing ADU per TMC 13.06.___, provide: past permits, supporting historical evidence, and
plans note for permit determination. This should be submitted as a detached/attached conversion.
Reports identified by staff which may include geotechnical report, height survey, wetland report, historical
approval, variance, or other decision or determination.
Provide itemized materials list and labor costs for verification of estimated values
You may apply for an Attached ADU Conversion, Detached ADU Conversion, or ADU Addition to Existing House
as a Residential Building Alteration Permit online at https://aca.accela.com/tacoma/
.
Instructions: Once you’ve registered online, login and select Permits to submit an application for Residential Alteration. All submittal
requirements must be attached to your application as PDF’s labeled as noted above, flattened and unprotected, except that
stormwater modeling files may be submitted in their native formats (e.g. .whm, .wh2, .mgs).
If you need assistance or are unable to submit online, please contact us at (253) 591-5030.
For electrical and water meter permits, contact Tacoma Public Utilities (TPU) www.mytpu.org.
Note: This checklist does not substitute for codes and regulations.
The applicant is responsible for compliance with all codes and regulations, whether or not described in this document.
More information: City of Tacoma, Planning and Development Services | www.tacomapermits.org (253) 591-5030
To request this information in an alternative format or a reasonable accommodation, please call 253-591-5030 (voice).
TTY or STS users please dial 711 to connect to Washington Relay Services.