Construct addition and substantial alterations to west one-family dwelling for a two-family dwelling
Addition 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
- Type of work
- Addition
- Status
- Issued
- Reported cost
- $391,349
- ZIP code
- 98144
- City's category
- Addition/Alteration, Single Family/Duplex
- City's status
- Issued
- Source
- Seattle Department of Construction and Inspections permit data (this record)
Type of work and status are our own standard labels, so permits compare across cities. The city's wording is in the "City's category" and "City's status" rows. We show costs under $100 as not listed, because filers often enter $0 or $1 when the city doesn't require a cost.
All permits at 3021 20th Ave S, and what's permitted nearby
Seattle Department of Construction and Inspections updated its data Oct 9, 2026. We checked it Oct 9, 15:20 UTC. See the city's official records (City of Seattle).
For agents and scripts: This page as Markdown · JSON