King County Permit Status

Look up building permit history and status across King County, WA jurisdictions — county-level permits (septic, critical areas, grading) and city-level permits (building, mechanical, electrical) can all apply to the same address. Coverage is live where a jurisdiction offers an open permit feed, and falls back to the correct municipal portal link everywhere else.

Coverage today: 🟢 20/39 cities live (status + history) · 🟠 19/39 indexed (issued-permit history from the King County Assessor; current status needs the city portal, which next_step names) · plus unincorporated King County. See the coverage scorecard below for the per-city breakdown.

python3 lookup.py "27927 E Main St"           # by address
python3 lookup.py "7222000353"                  # by parcel number
python3 lookup.py "B25000947"                   # by permit number
python3 lookup.py "23-127651-LP"                # Bellevue permit number
python3 lookup.py "6145915-CN"                  # Seattle SDCI permit number
python3 lookup.py --pipe "27927 E Main St"      # agent pipeline mode
python3 lookup.py --schema                      # print tool definition

Hosted API + MCP (no install)

The same lookup is served read-only, no auth, from permits-api.secondlandings.ai (server.py, zero dependencies; see deploy/README.md):

MCP (Streamable HTTP)	POST https://permits-api.secondlandings.ai/mcp — tool king_county_permit_status, arg query
REST	GET https://permits-api.secondlandings.ai/api/lookup?q=1817+Morris+Ave+S,+Renton+WA
OpenAPI 3.1 (typed)	/openapi.json · agent orientation /llms.txt · CLI definition /tool.json · /healthz

Results are live; the server caches each query for 15 minutes and rate-limits per client (30/min) to protect the municipal portals. Run it yourself with python3 server.py or docker compose up — server.json is the MCP Registry manifest.

Parcel-number searches query every supported MyBuildingPermit and live city portal because a bare parcel number does not identify its city jurisdiction.

Address searches are routed by geometry, not the mailing city: the address is geocoded with King County's four-county locator and the point is tested against the city-limits polygons. A "Kent, WA" address that sits in unincorporated King County is searched as county, not Kent; an address with no city in it is routed correctly instead of fanning out to every jurisdiction; and Pierce-side addresses of Milton/Pacific/Auburn get a pierce: parcel id. The mailing city is only used when geocoding fails (jurisdiction.basis says which).

What you get

{
  "action": "found",
  "permit_count": 2,
  "searched": ["Renton (EnerGov)"],
  "permits": [
    {
      "permit_number": "E26000458",
      "type": "Residential Electrical Permit",
      "status": "Issued",
      "description": "Electrical Work (Garage & Garage Exterior): ...",
      "address": "1817 Morris Ave S Renton WA 98055",
      "jurisdiction": "Renton",
      "applied_date": "2026-01-28",
      "issued_date": "2026-01-28",
      "finaled_date": null,
      "expires_date": "2027-07-27",
      "portal": "https://permitting.rentonwa.gov",
      "record_url": null,
      "is_open": true
    }
  ],
  "trust_level": "live",
  "fetched_at": "2026-10-08T19:02:11+00:00",
  "parcel_id": "king:7222000353",
  "cite_as": "King County Permit Status (github.com/chaoz23/king-county-permit-status), queried 2026-10-08 via Renton (EnerGov)"
}

Field	Description
action	found (permits returned), none (no matches), refine (connection issue)
permit_count	Number of unique permits found
permits	Array sorted newest applied_date first
searched	Which jurisdictions were searched
separate_portal	If the city has an unsupported portal: city name + URL + prose note
next_step	Structured twin of separate_portal for agents: kind: manual_portal_search, reason (no_feed / electrical_only / parcel_resolution_failed / source_incomplete), portal_url (the portal's actual search page when known — PermitTrax, LAMA, OpenGov, Kent), vendor, search_by (inputs that page accepts; empty when login-gated), query, query_type, covers_electrical, hint
errors	Source errors when a search is incomplete; may accompany permits from successful sources
trust_level	live (every applicable source answered), partial (a source errored or a portal needs manual follow-up), fallback (nothing searchable)
fetched_at	UTC timestamp of the query — records are live, never cached
parcel_id	County-namespaced parcel, e.g. king:7222000353 or pierce:5985002900, when the query was or resolved to a parcel
jurisdiction	Where the query was routed and why: city, basis (city-limits = the geocoded point falls inside that city's polygon — authoritative; geocoder-city; address-text = the mailing city in the query, used only when geocoding fails), county, unincorporated (true → county permits only, even if the mailing city says "Kent")
address_resolution	How well the geocoder matched an address: matched_address, score, match_type (point = exact address point; interpolated = number placed along the street, no parcel; street), partial_match, street_number_snapped
cite_as	One-line attribution string for generated text

Per permit: permit_number, type, status, is_open (normalized across vendor status vocabularies; null when the source exposes no status), description, address, jurisdiction, applied_date, issued_date, finaled_date, expires_date, portal, record_url (the specific record's URL when the source exposes one).

Multi-jurisdiction coverage

Source	Cities / scope
MyBuildingPermit.com	Auburn, Bellevue, Bothell, Burien, Edmonds, Federal Way, Issaquah, Kenmore, King County (unincorporated), Kirkland, Mercer Island, Mill Creek, Newcastle, Sammamish, Snoqualmie
Bellevue Open Data (live ArcGIS API)	Daily Bellevue permit snapshot (1998+) for address, parcel, and permit-number searches
Seattle Open Data (live Socrata APIs)	Building, electrical, trade, and land-use permits for Seattle address and permit-number searches
Renton EnerGov (live API)	All Renton permit types including electrical
Redmond EnerGov Civic Access (live API)	All Redmond permit types including electrical, for address, parcel, and permit-number searches
Accela Citizen Access (live)	Woodinville, and King County's own agency for unincorporated addresses (older history, enforcement and electrical records that MyBuildingPermit lacks), for address, parcel, and permit-number searches
SmartGov (live)	Normandy Park and Carnation, for address, parcel, and permit-number searches
King County Assessor parcel index	Issued-permit history (number, type, description, issue date, value, issuing city) for every King County parcel — the only source for the 19 cities without a public portal. It is what cities report for valuation: building/remodel/addition permits (some electrical), dense since ~2023 and thin before, back to the late 1990s; never trade sub-permits or inspections, and no status. Address queries use the geocoded parcel, parcel queries use it directly
LAMA (live)	SeaTac, for address and permit-number searches (incl. SeaTac's self-run electrical; parcel search not offered by the portal; capped at 200 newest per query)
Shoreline eTRAKiT (live)	Building, mechanical/plumbing, and land-use permits for Shoreline address, parcel, and permit-number searches (status/description not exposed by the portal's search)
WA State L&I	Electrical permits for cities not handling their own (2020+)

Coverage scorecard

Auto-generated from routing_data.json (python3 scripts/gen_scorecard.py --write). One row per King County city.

Legend — ✅ live (status + history) · 🗂️ index (valuation-reported building history from the King County Assessor's parcel index — no status, no sub-permits, dense since ~2023) · ➖ L&I electrical only (2020+) · ⚠️ gap (city self-runs electrical, not yet integrated)

Health = last weekly live probe of the city's source (scripts/source_health.py, 2026-10-09): ✅ answered with records · ⚪ answered, zero rows for a known-good query · ⛔ blocked (403) · ❌ down · ❔ unchecked · — no live source

City	Status	Source	Health	Building	Electrical	Mech/Plumb	Land Use
Algona	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Auburn	🟢 Live	MyBuildingPermit	✅	✅	➖ L&I	✅	✅
Beaux Arts Village	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Bellevue	🟢 Live	Bellevue (Open Data)	✅	✅	✅	✅	✅
Black Diamond	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Bothell	🟢 Live	MyBuildingPermit	✅	✅	➖ L&I	✅	✅
Burien	🟢 Live	MyBuildingPermit	✅	✅	✅	✅	✅
Carnation	🟢 Live	Carnation (SmartGov)	✅	✅	➖ L&I	✅	✅
Clyde Hill	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Covington	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Des Moines	🟠 Indexed	KC Assessor index	✅	🗂️ index	⚠️ gap	🗂️ index	🗂️ index
Duvall	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Enumclaw	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Federal Way	🟢 Live	MyBuildingPermit	✅	✅	✅	✅	✅
Hunts Point	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Issaquah	🟢 Live	MyBuildingPermit	✅	✅	➖ L&I	✅	✅
Kenmore	🟢 Live	MyBuildingPermit	✅	✅	➖ L&I	✅	✅
Kent	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Kirkland	🟢 Live	MyBuildingPermit	✅	✅	✅	✅	✅
Lake Forest Park	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Maple Valley	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Medina	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Mercer Island	🟢 Live	MyBuildingPermit	✅	✅	✅	✅	✅
Milton	🟠 Indexed	KC Assessor index	✅	🗂️ index	⚠️ gap	🗂️ index	🗂️ index
Newcastle	🟢 Live	MyBuildingPermit	✅	✅	➖ L&I	✅	✅
Normandy Park	🟢 Live	Normandy Park (SmartGov)	✅	✅	✅	✅	✅
North Bend	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Pacific	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Redmond	🟢 Live	Redmond (EnerGov Civic Access)	✅	✅	✅	✅	✅
Renton	🟢 Live	Renton (EnerGov)	✅	✅	✅	✅	✅
Sammamish	🟢 Live	MyBuildingPermit	✅	✅	✅	✅	✅
SeaTac	🟢 Live	SeaTac (LAMA)	✅	✅	✅	✅	✅
Seattle	🟢 Live	Seattle (SDCI Open Data)	✅	✅	✅	✅	✅
Shoreline	🟢 Live	Shoreline (eTRAKiT)	✅	✅	➖ L&I	✅	✅
Skykomish	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
Snoqualmie	🟢 Live	MyBuildingPermit	✅	✅	➖ L&I	✅	✅
Tukwila	🟠 Indexed	KC Assessor index	✅	🗂️ index	⚠️ gap	🗂️ index	🗂️ index
Woodinville	🟢 Live	Woodinville (Accela)	✅	✅	➖ L&I	✅	✅
Yarrow Point	🟠 Indexed	KC Assessor index	✅	🗂️ index	➖ L&I	🗂️ index	🗂️ index
King County (unincorp.)	🟢 Live	MyBuildingPermit (King County) + KC Accela	✅	✅	➖ L&I	✅	✅

Coverage: 20/39 live · 19/39 indexed (issued history via the Assessor; status needs the city portal). Plus King County (unincorporated) for county-level permits (septic, critical areas, grading).

⚠️ Electrical gaps: Des Moines, Milton, Tukwila. These cities self-run their electrical program (so L&I is skipped) and are not on MyBuildingPermit, leaving their electrical permits in no feed we search. MBP cities that self-run electrical (Burien, Federal Way, Kirkland, Mercer Island, Sammamish) are not gaps — verified 2026-07-15 that MBP carries their electrical history. Closing the remaining gaps is tracked in the coverage epic.

ℹ️ Split-county cities: Milton (mostly Pierce), Pacific and Auburn straddle the King/Pierce line. Each city issues its own permits for the whole city, so the row above applies to both sides; only county-level permits (septic, critical areas) differ — Pierce County's portal is not searched. Parcel ids are county-namespaced (king:…) for this reason.

All 39 incorporated King County cities are recognized. Cities outside the searchable sources are flagged with their municipal portal URL rather than being treated as unincorporated King County.

For comma-separated addresses, the locality component takes precedence over city names that also appear in streets (for example, Kent Kangley Rd, Covington). If a Renton address cannot be resolved to a parcel for its live EnerGov search, the result retains Renton's portal as an actionable fallback. Seattle address and exact permit-number searches query all four official SDCI Open Data datasets; parcel-only Seattle lookup is not yet supported. Kent's official permit-status page currently requires users to sign in to the city portal, so Kent results include that page as a manual fallback.

Exit codes

Code	Action	Meaning
0	found	permits[] is populated
1	none / refine	No permits or connection issue
2	reject	Bad input

For agents

tool.json at the repo root contains the full tool definition in Anthropic/OpenAI tool-call format. An agent can load it directly or fetch the live version:

python3 lookup.py --schema

{
  "name": "king_county_permit_status",
  "description": "Look up building permit history and status for any King County, WA property...",
  "input_schema": {
    "type": "object",
    "properties": {
      "query": {
        "type": "string",
        "description": "Street address, 10-digit parcel number, or permit number..."
      }
    },
    "required": ["query"]
  },
  "output_schema": { ... },
  "invocation": {
    "command": "python3 lookup.py --pipe \"{query}\"",
    "exit_codes": {
      "0": "action=found — permits[] is populated",
      "1": "action=none or refine — no permits or connection issue",
      "2": "action=reject — bad input"
    }
  }
}

Pipeline pattern:

# Get all permits at an address, extract open ones
python3 lookup.py --pipe "1817 Morris Ave S, Renton WA" \
  | python3 -c "
import sys, json
d = json.load(sys.stdin)
open_statuses = {'Issued', 'In Review', 'On Hold', 'Pending'}
open_permits = [p for p in d.get('permits', []) if p['status'] in open_statuses]
print(json.dumps(open_permits, indent=2))
"

Related tools in this series:

• king-county-address-to-parcel-number — resolve an address to its parcel number
• wa-contractor-license — verify WA contractor license status and violations
• king-county-property-tax-appeal — build a filing-ready tax appeal packet

Requirements

• Python 3.10+ (stdlib only, no dependencies)
• Network access to permitsearch.mybuildingpermit.com, services1.arcgis.com, permitting.rentonwa.gov, secure.lni.wa.gov

Development

Run the network-free regression suite with:

python3 -m unittest discover -s tests -v

License

MIT