# Addition permit 7050089-CN at 3021 20th Ave S, Seattle

Seattle Department of Construction and Inspections permit 7050089-CN: issued Dec 1, 2025 for addition work at 3021 20th Ave S. Construct addition and substantial alterations to west one-family dwelling for a two-family dwelling per plan. (Allow (2) attached accessory dwelling units - one for a new-single family residence and one for an existing single-family residence per the land use code. Construct addition and substantial alterations to (1) existing one-family dwelling for a two-family dwelling and construct (1) new two-family dwelling per plans. Reviews and processing for (2) CN's under 7050089).

- Permit number: 7050089-CN
- Issued: Dec 1, 2025
- Type of work: Addition (city: Addition/Alteration, Single Family/Duplex)
- Status: Issued (city: Issued)
- Reported cost: $391,349
- ZIP code: 98144
- All permits at this address: https://nearbypermits.com/seattle/address/3021-20th-ave-s/

---
Source: Seattle Department of Construction and Inspections permit data (https://cos-data.seattle.gov/d/76t5-zqzr), City of Seattle. Checked 2026-10-10 09:24 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Every permit at 3021 20th Ave S: https://nearbypermits.com/seattle/address/3021-20th-ave-s/