Attached ADU (AADU) Permits in Puyallup

An ADU built inside or attached to the primary residence — basement conversion, garage conversion, or bump-out addition. Lower cost; constrained by the primary footprint.

Free lookup: your lot’s zoning and setbacks, with an attached ADU placed on it to move and turn.

Permit fees in Puyallup

Set by the Puyallup fee schedule.

Puyallup fee schedule

Puyallup prices an ADU's building permit on the value of the work: $643.75 for the first $50,000 plus $7 for each $1,000 more up to $100,000, and $993.75 for the first $100,000 plus $5.60 for each $1,000 more up to $500,000, with plan review added as set in the schedule's Exhibit A. Plumbing is a separate City permit: $40 to issue, and for a one- or two-family dwelling $160 with one bathroom, $200 with two and $240 with three, or $13 for each fixture altered, with plan review at 65% of the plumbing fee. Mechanical work is $40 to issue plus unit fees, such as $19.55 a furnace up to 100,000 Btu/h and $14.10 for duct work to 1 to 5 diffusers. The electrical permit comes from L&I, at L&I's fees (2026 Municipal Fee Schedule). Apply through Puyallup's online permit system, CityView (permits.puyallupwa.gov/Portal); the Permit Services page (puyallupwa.gov/325/Permit-Services) walks through the steps and fees.

Review timeline

Not published by Puyallup.

What Puyallup asks for with an attached ADU

Every application (8)

Building permit application, completed and signed
Current City of Puyallup Business License
Site address
Pierce County parcel number
Site plan
Floor plan
WSEC energy compliance, prescriptive path
WSU energy forms: energy credits, HVAC sizing and glazing schedule (an addition), or the WSEC-R Alteration & Remodel form (a conversion)

Where the lot or the work calls for it

Where the ADU adds onto the house or changes its structure

Foundation plan
Roof + floor framing plan
Structural design notes (loads, materials, inspections)
Truss Layout and Calculations (a new roof)

Where the ADU adds onto the house or changes its outside walls, windows or roof

Typical building / wall section
Building elevations N/S/E/W
Major materials schedule

Where the work changes the outside walls, windows or roof

Glazing + door schedule (NFRC U-factor / SHGC)

From the city’s own documents: City of Puyallup — Submittal Requirements for Building Permits (September 2025), last read October 22, 2026. An address’s own page checks its lot for slopes, flood zones and critical areas.

AADU-specific requirements

Egress on every bedroom — IRC R310 net clear opening ≥5.7 sf; sill ≤44″ from floor.
Smoke + CO alarms — interconnected throughout primary + AADU per IRC R314/R315.
1-hr separation — required between AADU and primary in some cases; otherwise a continuous draft stop.
Independent kitchen + bath — full plumbing + cooking provision in the AADU.
Address or unit number — the city or county assigns addresses; ask the permit center whether the unit gets its own.