# Building permits at 4401 4th Ave S, Seattle, WA 16 permits on record here. The newest, Jun 11: Construct tenant improvement to existing warehouse (Costco). Within a quarter mile, the city has issued no other permits since May 1. ## At this address | Date | Type | Work | Cost | Permit | |---|---|---|---|---| | Jun 11, 2026 | Alteration or repair | Construct tenant improvement to existing warehouse (Costco) per plan. | $75,000 | [7049062-CN](https://nearbypermits.com/seattle/permit/7049062-CN/) | | Dec 29, 2023 | Fence, wall or deck | Commercial tenant improvements (Costco Wholesale) to existing commercial structure per plan. Mechanical is included. | $1,750,000 | [6953320-CN](https://nearbypermits.com/seattle/permit/6953320-CN/) | | Sep 12, 2022 | Alteration or repair | Construct tenant improvements to existing commercial building (Costco) per plan. Mechanical included. | $95,000 | [6912714-CN](https://nearbypermits.com/seattle/permit/6912714-CN/) | | Jul 6, 2021 | Alteration or repair | Construct site improvements for accessibility adjacent to existing commercial building (Costco) per plan. | $82,000 | [6737874-CN](https://nearbypermits.com/seattle/permit/6737874-CN/) | | Oct 14, 2019 | Alteration or repair | Construct alterations to existing commercial building (Costco warehouse) per plan. Mechanical Included | $430,000 | [6734345-CN](https://nearbypermits.com/seattle/permit/6734345-CN/) | | Jun 26, 2019 | Alteration or repair | Construct alterations in a commercial building to remodel 4 existing bathrooms subject to field inspection (STFI). | $140,000 | [6734591-CN](https://nearbypermits.com/seattle/permit/6734591-CN/) | | Mar 27, 2018 | Alteration or repair | Relocation of refrigerated display case and hand sink in existing retail space (Costco) subject to field inspection (STFI). | $15,000 | [6644079-CN](https://nearbypermits.com/seattle/permit/6644079-CN/) | | Jan 12, 2018 | Alteration or repair | Alterations to add a mezzanine in a commercial building at the SE corner per plan. | $682,315 | [6606612-CN](https://nearbypermits.com/seattle/permit/6606612-CN/) | | Jan 6, 2016 | Alteration or repair | Construct additions and alterations to expand existing gas station (Costco) per plan. | $1,039,594 | [6479208-CN](https://nearbypermits.com/seattle/permit/6479208-CN/) | | Nov 26, 2014 | Alteration or repair | Construct interior alterations to existing commercial building to expand produce cooler (adjacent west wall) and modify exit from tire center (along south wall) per plan. | $150,000 | [6427882-CN](https://nearbypermits.com/seattle/permit/6427882-CN/) | | Oct 10, 2014 | Addition | Addition and alteration to existing accessory to Optical Consultation room in (Costco 001) building per plans. | $125,876 | [6428411-CN](https://nearbypermits.com/seattle/permit/6428411-CN/) | | Oct 25, 2013 | Alteration or repair | Pharmacy food prep ("Demo Room") and Hearing Aid Center Remodel subject to field inspection (STFI) per plans. | $291,227 | [6384515-CN](https://nearbypermits.com/seattle/permit/6384515-CN/) | | Aug 5, 2010 | Alteration or repair | Construct slab/foundation for proposed above ground fuel tank installation at the SE end of the property (Costco Gas Station) per plan. | $75,000 | [6248160-CN](https://nearbypermits.com/seattle/permit/6248160-CN/) | | May 20, 2009 | Alteration or repair | TI-expand the existing produce cooler relocate the existing deli and expand the existing deli cooler. | $225,000 | [6212151-CN](https://nearbypermits.com/seattle/permit/6212151-CN/) | | Apr 23, 2007 | Alteration or repair | Closed as Incomplete - Expired Permit Alteration to remove and replace delay egress hardware on existing doors for Costco per plans | $22,500 | [6132681-CN](https://nearbypermits.com/seattle/permit/6132681-CN/) | | Aug 15, 2005 | Alteration or repair | Closed as Incomplete - Expired Permit Expand walk-in produce cooler room at COSTCO store by 4' in width and 4' in length per floor plan subject to field inpsection. | $15,000 | [6069254-CN](https://nearbypermits.com/seattle/permit/6069254-CN/) | ## Within ΒΌ mi since May 1, 2026 0 permits in the circle. From our copy of the city's data (last 24 months). --- Source: Seattle Department of Construction and Inspections permit data (https://cos-data.seattle.gov/d/76t5-zqzr). Checked 2026-10-05 14:59 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ Map and all 16 permits at this address: https://nearbypermits.com/seattle/address/4401-4th-ave-s/