# Building permits at 1644 B 20th Ave, Seattle, WA One permit on record here. The newest, Nov 25, 2024: Construct additions and alterations to townhouse. Within a quarter mile, the city has issued 9 more permits since May 1. ## At this address | Date | Type | Work | Cost | Permit | |---|---|---|---|---| | Nov 25, 2024 | Addition | Construct additions and alterations to townhouse per plan. | $20,000 | [7029451-CN](https://nearbypermits.com/seattle/permit/7029451-CN/) | ## Within ¼ mi since May 1, 2026 9 permits in the circle. From our copy of the city's data (last 24 months). ### This block (250 to 1,000 ft), 6 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Sep 15, 2026 | [127 D 22nd Ave E](https://nearbypermits.com/seattle/address/127-d-22nd-ave-e/) | 980 ft NE | Alteration or repair | Construct alterations to existing two family dwelling at deck per plan. | $10,000 | [7156141-CN](https://nearbypermits.com/seattle/permit/7156141-CN/) | | Sep 8, 2026 | [1803 18th Ave](https://nearbypermits.com/seattle/address/1803-18th-ave/) | 970 ft NW | Roofing | Multi family building re roof project. 47 squares to replace with comp shingles. | $42,500 | [7161675-RR](https://nearbypermits.com/seattle/permit/7161675-RR/) | | Sep 3, 2026 | [1637 23rd Ave](https://nearbypermits.com/seattle/address/1637-23rd-ave/) | 680 ft E | Alteration or repair | Construct foundation repair with helical-piles to portions of an existing single-family residence per plan. | $44,000 | [7150587-CN](https://nearbypermits.com/seattle/permit/7150587-CN/) | | Aug 12, 2026 | [118 A 21st Ave E](https://nearbypermits.com/seattle/address/118-a-21st-ave-e/) | 950 ft N | Fence, wall or deck | Replace two existing deck support posts with new concrete footings and new pressure-treated support posts subject to field inspection STFI. | $7,000 | [7157597-CN](https://nearbypermits.com/seattle/permit/7157597-CN/) | | Jul 22, 2026 | [1600 19th Ave](https://nearbypermits.com/seattle/address/1600-19th-ave/) | 590 ft SW | Demolition | Establish as vacant per the land use code. Demolish residential structure per plans | Not listed | [7112374-DM](https://nearbypermits.com/seattle/permit/7112374-DM/) | | Jul 13, 2026 | [1818 E Madison St](https://nearbypermits.com/seattle/address/1818-e-madison-st/) | 560 ft W | Alteration or repair | Interior repairs to multifamily building Subject to field inspection (STFI) | $22,381 | [7152122-CN](https://nearbypermits.com/seattle/permit/7152122-CN/) | ### Farther (1,000 ft to ¼ mi), 3 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Aug 12, 2026 | [1715 E Madison St](https://nearbypermits.com/seattle/address/1715-e-madison-st/) | 0.19 mi W | Alteration or repair | Construct minor alterations to telecommunications facility on existing tower per plan | $25,000 | [7153529-CN](https://nearbypermits.com/seattle/permit/7153529-CN/) | | Jul 22, 2026 | [109 23rd Ave E](https://nearbypermits.com/seattle/address/109-23rd-ave-e/) | 0.25 mi NE | Roofing | Reroof: Recover of existing asphalt bur roof roof with a Carlisle 60mil TPO single ply roofing system. Includes new edge metal and new flashings at penetrations all details per manufacturer recommendation's for install and for a 20 yr warrantable system. | $158,590 | [7154360-RR](https://nearbypermits.com/seattle/permit/7154360-RR/) | | Jun 2, 2026 | [1715 E Madison St](https://nearbypermits.com/seattle/address/1715-e-madison-st/) | 0.19 mi W | Alteration or repair | Construct alterations to telecommunications facility (AT&T) on site of existing commercial building per plan. | $25,000 | [7129991-CN](https://nearbypermits.com/seattle/permit/7129991-CN/) | ## Zoning requests nearby There are no zoning requests on file within ¼ mi. Seattle's feed was last read Oct 9. ## More on this street Other addresses on B 20th Ave with permits, nearest house number first: - [310 B 20th Ave](https://nearbypermits.com/seattle/address/310-b-20th-ave/): newest permit Jul 7, 2025 - [308 B 20th Ave](https://nearbypermits.com/seattle/address/308-b-20th-ave/): newest permit Jul 7, 2025 - [124 B 20th Ave](https://nearbypermits.com/seattle/address/124-b-20th-ave/): newest permit Dec 16, 2025 --- Source: Seattle Department of Construction and Inspections permit data (https://cos-data.seattle.gov/d/76t5-zqzr), City of Seattle. Checked 2026-10-09 04:03 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ Zoning requests come from the Seattle land use permits (https://cos-data.seattle.gov/d/ht3q-kdvx), City of Seattle. We read it Oct 9, 00:18 UTC. Map, the one permit at this address and 9 nearby: https://nearbypermits.com/seattle/address/1644-b-20th-ave/