# Building permits at 401 20th Ave, Seattle, WA Two permits on record here. The newest, Mar 31: Construct alterations to basement level of a single-family residence subject to field inspection (STFI). Within a quarter mile, the city has issued 5 more permits since May 1. One is for a new building, 450 ft away. ## At this address | Date | Type | Work | Cost | Permit | |---|---|---|---|---| | Mar 31, 2026 | Alteration or repair | Construct alterations to basement level of a single-family residence subject to field inspection (STFI) | $82,000 | [7135695-CN](https://nearbypermits.com/seattle/permit/7135695-CN/) | | Mar 11, 2024 | Alteration or repair | Construct additions and alterations to existing single family residence per plan. | $168,253 | [6975308-CN](https://nearbypermits.com/seattle/permit/6975308-CN/) | ## Within ¼ mi since May 1, 2026 5 permits in the circle. From our copy of the city's data (last 24 months). ### This block (250 to 1,000 ft), 4 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Sep 10, 2026 | [536 19th Ave](https://nearbypermits.com/seattle/address/536-19th-ave/) | 740 ft N | Addition | Construct deck addition for one family dwelling subject to field inspection STFI. | $7,000 | [7161728-CN](https://nearbypermits.com/seattle/permit/7161728-CN/) | | Sep 7, 2026 | [155 21st Ave](https://nearbypermits.com/seattle/address/155-21st-ave/) | 940 ft S | Roofing | Project consists of recovering the existing roof with a new 115mil Fleeceback TPO membrane while leaving the existing roof membrane in place. Work includes preparation of the existing membrane installation of the new 115mil fleeceback membrane in adhesive directly over existing membrane and integrat | $89,038 | [7161506-RR](https://nearbypermits.com/seattle/permit/7161506-RR/) | | Jul 22, 2026 | [2101 E James St](https://nearbypermits.com/seattle/address/2101-e-james-st/) | 780 ft NE | Roofing | Reroof of Both Steep Slope and low slope areas:1. Steep Slope; remove and replace in like kind asphalt shingle roofing. Remove existing asphalt shingle roofing and dispose of properly. Install New Certainteed Landmark Asphalt shingle roofing system underlayment new edge metal and flashing all per ma | $94,245 | [7154389-RR](https://nearbypermits.com/seattle/permit/7154389-RR/) | | Jun 16, 2026 | [506 20th Ave](https://nearbypermits.com/seattle/address/506-20th-ave/) | 450 ft N | New building | Establish use as two attached dwelling units per Land Use Code. Construct new two family dwelling per plan. | $512,878 | [7104413-CN](https://nearbypermits.com/seattle/permit/7104413-CN/) | ### Farther (1,000 ft to ¼ mi), 1 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Aug 3, 2026 | [706 20th Ave](https://nearbypermits.com/seattle/address/706-20th-ave/) | 0.21 mi N | Alteration or repair | Construct alterations for fire damage repair to remove damaged dropped ceilings finishes and windows in kind subject to field inspection (STFI). | $75,000 | [7154710-CN](https://nearbypermits.com/seattle/permit/7154710-CN/) | ## More on this street Other addresses on 20th Ave with permits, nearest house number first: - [308 20th Ave](https://nearbypermits.com/seattle/address/308-20th-ave/): newest permit Jun 18, 2025 - [504 20th Ave](https://nearbypermits.com/seattle/address/504-20th-ave/): newest permit Mar 12, 2026 - [506 20th Ave](https://nearbypermits.com/seattle/address/506-20th-ave/): newest permit Jun 16, 2026 - [706 20th Ave](https://nearbypermits.com/seattle/address/706-20th-ave/): newest permit Aug 3, 2026 - [823 20th Ave](https://nearbypermits.com/seattle/address/823-20th-ave/): newest permit Oct 1, 2025 - [925 20th Ave](https://nearbypermits.com/seattle/address/925-20th-ave/): newest permit Oct 13, 2025 - [941 20th Ave](https://nearbypermits.com/seattle/address/941-20th-ave/): newest permit Sep 2, 2025 - [1452 20th Ave](https://nearbypermits.com/seattle/address/1452-20th-ave/): newest permit Dec 17, 2025 - [1455 20th Ave](https://nearbypermits.com/seattle/address/1455-20th-ave/): newest permit Jul 16, 2025 - [1463 20th Ave](https://nearbypermits.com/seattle/address/1463-20th-ave/): newest permit Jun 12, 2025 --- Source: Seattle Department of Construction and Inspections permit data (https://cos-data.seattle.gov/d/76t5-zqzr), City of Seattle. Checked 2026-10-06 21:06 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ Map, both permits at this address and 5 nearby: https://nearbypermits.com/seattle/address/401-20th-ave/