# Addition permit 6902178-CN at 814 20th Ave S, Seattle

Seattle Department of Construction and Inspections permit 6902178-CN: issued Sep 11, 2025 for addition work at 814 20th Ave S. Allow accessory dwelling unit per land use code. Construct a second story addition and substantial alterations to existing single family residence per plan.

- Permit number: 6902178-CN
- Issued: Sep 11, 2025
- Type of work: Addition (city: Addition/Alteration, Single Family/Duplex)
- Status: Issued (city: Issued)
- Reported cost: $497,057
- ZIP code: 98144
- All permits at this address: https://nearbypermits.com/seattle/address/814-20th-ave-s/

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Source: Seattle Department of Construction and Inspections permit data (https://cos-data.seattle.gov/d/76t5-zqzr), City of Seattle. Checked 2026-10-07 05:18 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Every permit at 814 20th Ave S: https://nearbypermits.com/seattle/address/814-20th-ave-s/