# Building permits at 3421 4th St, Boulder, CO

One permit here in the last two years. The newest, Jan 23: Remove & replace (2) windows - no alterations to framed openings - u-factor.23. Boulder publishes permits without map coordinates, so this address has no map and no quarter-mile list.

## At this address

| Date | Type | Work | Cost | Permit |
|---|---|---|---|---|
| Jan 23, 2026 | Alteration or repair | Remove & replace (2) windows - no alterations to framed openings - u-factor.23 | $2,491 | [BLD-SFD2026-00017](https://nearbypermits.com/boulder/permit/BLD-SFD2026-00017/) |

## More on this street

Other addresses on 4th St with permits, nearest house number first:

- [3390 4th St](https://nearbypermits.com/boulder/address/3390-4th-st/): newest permit Apr 6, 2026
- [3380 4th St](https://nearbypermits.com/boulder/address/3380-4th-st/): newest permit Apr 3, 2026
- [3369 4th St](https://nearbypermits.com/boulder/address/3369-4th-st/): newest permit Dec 11, 2025
- [3355 4th St](https://nearbypermits.com/boulder/address/3355-4th-st/): newest permit Jul 9, 2026
- [3500 4th St](https://nearbypermits.com/boulder/address/3500-4th-st/): newest permit Nov 5, 2025
- [3311 4th St](https://nearbypermits.com/boulder/address/3311-4th-st/): newest permit Nov 17, 2025
- [3309 4th St](https://nearbypermits.com/boulder/address/3309-4th-st/): newest permit May 22, 2025
- [3307 4th St](https://nearbypermits.com/boulder/address/3307-4th-st/): newest permit Apr 13, 2026
- [3302 4th St](https://nearbypermits.com/boulder/address/3302-4th-st/): newest permit Jul 3, 2025
- [3561 4th St](https://nearbypermits.com/boulder/address/3561-4th-st/): newest permit Jun 23, 2025

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Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-07 14:04 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

The one permit at this address: https://nearbypermits.com/boulder/address/3421-4th-st/