# Building permits at 2100 28th St 1a, Boulder, CO

Two permits here in the last two years. The newest, Apr 20: Replacement of three RTU's. 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 |
|---|---|---|---|---|
| Apr 20, 2026 | Mechanical (HVAC) | Replacement of three RTU's. RTU 1, 2 and 4 units are like for like. Units sit behind parapet wall and can't be seen from street. Kelly Electrical Services (5188) will be doing electrical work. PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel  | $45,699 | [MEC2026-00535](https://nearbypermits.com/boulder/permit/MEC2026-00535/) |
| Oct 21, 2024 | Sign | For Unit 1A, both logo and letter wall signs on the south and west frontage of the building will be replaced. All signs will use existing electric. | $12,000 | [SGN2024-00091](https://nearbypermits.com/boulder/permit/SGN2024-00091/) |

## Zoning requests nearby

We don't list zoning cases for Boulder yet. Look them up on the city's Board of Zoning Adjustment page: https://bouldercolorado.gov/government/board-commission/board-zoning-adjustment

## More on this street

Other addresses on 28th St with permits, nearest house number first:

- [1933 28th St](https://nearbypermits.com/boulder/address/1933-28th-st/): newest permit Apr 14, 2025
- [1906 28th St](https://nearbypermits.com/boulder/address/1906-28th-st/): newest permit Jun 15, 2026
- [1895 28th St](https://nearbypermits.com/boulder/address/1895-28th-st/): newest permit Jun 30, 2026
- [1875 28th St](https://nearbypermits.com/boulder/address/1875-28th-st/): newest permit Oct 30, 2025
- [1800 28th St](https://nearbypermits.com/boulder/address/1800-28th-st/): newest permit Jul 31, 2026
- [2405 28th St](https://nearbypermits.com/boulder/address/2405-28th-st/): newest permit Jul 9, 2025
- [1789 28th St](https://nearbypermits.com/boulder/address/1789-28th-st/): newest permit Jul 6, 2026
- [1741 28th St](https://nearbypermits.com/boulder/address/1741-28th-st/): newest permit Apr 14, 2025
- [1731 28th St](https://nearbypermits.com/boulder/address/1731-28th-st/): newest permit Sep 28, 2026
- [1690 28th St](https://nearbypermits.com/boulder/address/1690-28th-st/): newest permit Sep 17, 2026

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Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-09 11:34 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Both permits at this address: https://nearbypermits.com/boulder/address/2100-28th-st-1a/