Residential ADU and addition permits in Unincorporated Pierce County, WA
24 residential ADU and addition permits issued by Pierce County unincorporated, the 8 weeks ending Oct 15, 2026. Oct 15, 2026 is the latest issue date the source has published.
Quick answer. In the 8 weeks ending Oct 15, 2026, 24 residential ADU and addition permits were issued in Unincorporated Pierce County, WA, according to public records from Pierce County unincorporated. The busiest ZIP codes were 98391 (5 permits), 98335 (3 permits), 98329 (3 permits). The median declared value was $74,662 across 14 permits that list one. The latest permit date published is Oct 15, 2026.
What an ADU and addition permit means in Unincorporated Pierce County
A residential ADU or addition permit is a new unit or more square footage on an existing home. For an ADU builder or addition contractor it shows where lots are being built out, and the subs those jobs need.
In Unincorporated Pierce County, permits were issued on 17 different days in the window; the most recent were Oct 14, 2026, Oct 12, 2026, Oct 6, 2026. The busiest ZIPs were 98391 (5), 98335 (3), 98329 (3).
By residential ADU and addition permit count, Unincorporated Pierce County ranks #31 of the 49 ADU and addition pages on this site and #4 of 5 in WA.
- Mail the neighbors of each ADU.
- Pitch trades to the builders pulling the most permits.
- Track declared values by ZIP.
See plans for Unincorporated Pierce County ADU and addition leads
Other work on the same permits
Share of these 24 permits whose type or description also matches another trade. These are the follow-on and partner trades on Unincorporated Pierce County jobs.
- garage: 5 permits (21%)
- deck/patio: 4 permits (17%)
- fire sprinkler: 1 permits (4%)
- sewer/septic: 1 permits (4%)
Weekly trend
Permits per 7-day period, ending Oct 15, 2026. n/c = not collected yet (before our pipeline started pulling this source). It is not zero. Striped bars are partly collected weeks.
Top permit types
| Permit type / subtype | Permits | Share |
|---|---|---|
| Construction Residential | 15 | 62% |
| Site Dev Residential | 4 | 17% |
| Mobile/Manuf Home Anch and Fdn | 2 | 8% |
| Residential Fire Sprinkler System | 1 | 4% |
| Sewer Residential | 1 | 4% |
Busiest ZIP codes
| ZIP | Permits | Share | 8-wk avg / week |
|---|---|---|---|
| 98391 | 5 | 21% | 0.62 |
| 98335 | 3 | 12% | 0.38 |
| 98329 | 3 | 12% | 0.38 |
| 98304 | 2 | 8% | 0.25 |
| 98321 | 2 | 8% | 0.25 |
8-wk avg / week is the trailing 8-week weekly average we quote in coverage checks for that ZIP and trade. It counts every source in the ZIP and includes permits with unknown use, so it can be higher than this page's residential count.
Type stated in the permit
| Type | Permits | Share |
|---|---|---|
| ADU | 14 | 58% |
| room addition | 4 | 17% |
Parsed from the permit's own type and work text. A permit can state more than one; many state none.
Sample rows
Anonymized: street address, permit number and any names removed. Subscribers get the full row with address, permit number and source link.
| Issued | ZIP | Permit type | Scope | Type | Declared value |
|---|---|---|---|---|---|
| 2026-10-14 | 98391 | Construction Residential | windows/doors + addition/ADU | ADU | $2,420 |
| 2026-09-28 | 98329 | Construction Residential | addition/ADU | ADU | n/a |
| 2026-09-18 | 98304 | Site Dev Residential | addition/ADU | ADU | n/a |
| 2026-09-16 | 98446 | Site Dev Residential | addition/ADU | ADU | n/a |
| 2026-09-08 | 98303 | Construction Residential | addition/ADU + deck/patio | not stated | $74,112 |
| 2026-08-26 | 98445 | Construction Residential | addition/ADU + garage | not stated | $489,770 |
Source
- Pierce County unincorporated: Permit records on internal.open.piercecountywa.gov (dataset nhnt-v7ka), published by Pierce County unincorporated. Source dataset. Collected window(s): Aug 21, 2026 – Oct 15, 2026. Last pulled Oct 18, 2026.
Metric: Residential = the source marks the permit's use as residential (permits with commercial or unknown use are not counted). ADUs & Additions = the permit's type or work description matches the Curbside Signal ADU and addition rules. Counts exclude void or cancelled permits. Dates are the jurisdiction's permit issue date. Records are deduplicated on source and permit number. How we count. Part of the Seattle-Tacoma-Bellevue, WA metro: every trade × city page there.
The honest limit. A permit usually means the job is already sold. We say that up front. The value is what happens around it:
- Neighbor marketing around active jobs: same-age houses on the same street.
- Cross-trade follow-on demand: new roof → solar, gutters, insulation; remodel → HVAC, electrical, landscaping, pool; new build → pest, security, landscaping.
- Competitor intelligence: which contractors pull permits where (where the jurisdiction publishes it), and who to recruit as subs.
- Early-stage projects for commercial trades and GC subs.
Follow-on: ADUs and additions drive HVAC, electrical, plumbing, solar and landscaping work.
Other trades in Unincorporated Pierce County, WA
Residential permits in the same window, by trade.
Questions
How many residential ADU and addition permits were issued in Unincorporated Pierce County, WA recently?
24 residential ADU and addition permits in the public records we pulled, the 8 weeks ending Oct 15, 2026. Source: Pierce County unincorporated.
Which Unincorporated Pierce County ZIP codes have the most ADU and addition permits?
98391 (5 permits), 98335 (3 permits), 98329 (3 permits), by residential ADU and addition permit count the 8 weeks ending Oct 15, 2026. 13 ZIP codes had at least one permit.
What is the median declared value of a residential ADU and addition permit in Unincorporated Pierce County?
$74,662, across 14 permits that list a valuation. Declared values are what the applicant stated on the permit, not the contract price.
How do I get the Unincorporated Pierce County ADU and addition permit list, and what does it cost?
Request a free sample for your ZIPs first. ZIP Pack is $29/mo for one trade and up to 5 ZIPs every Monday; Metro Feed is $99/mo for a whole metro and up to 3 trades, with daily alerts. Guarantee on every package: If a weekly file is late or missing, that month is free. If a month delivers under half the 8-week average permit count for your ZIPs and trade, the next month is free.
Unincorporated Pierce County ADU and addition leads, every Monday
Send your trade and ZIP codes. We'll reply with a real sample from the public records we pull, or tell you plainly that we don't cover you yet.