# Building permits at 2345 Walnut St, Boulder, CO

Seven permits on record here. The newest, Dec 12, 2025: Alterations of 1st floor (1,015 sf) and addition of stairway and usable space in attic (151 sf). 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 |
|---|---|---|---|---|
| Dec 12, 2025 | Addition | Alterations of 1st floor (1,015 sf) and addition of stairway and usable space in attic (151 sf). *11/20/25 Revision to reduce scope. Remove the addition of floor area to the existing attic and associated stair and dormer.* *See HIS2025-00069* | $90,000 | [BLD-SFD2025-00387](https://nearbypermits.com/boulder/permit/BLD-SFD2025-00387/) |
| Dec 9, 2025 | Fence, wall or deck | 3/23/2026 Revision to remove drywall installation on interior North, South and East walls. Remove attic access stairs. 349 sf detached garage | $38,000 | [BLD-ACC2025-00091](https://nearbypermits.com/boulder/permit/BLD-ACC2025-00091/) |
| May 8, 2025 | Alteration or repair | Level 3 Alteration of existing rear building to convert a 2-bed 1-bath into a 3-bed 2-bath. Mechanical and appliances upgraded to electric. *8/11/25 Revision to HVAC design from heat pump serving handler to heat pump serving individual cassettes and electric heaters in bathrooms* | $80,000 | [BLD-SFD2025-00079](https://nearbypermits.com/boulder/permit/BLD-SFD2025-00079/) |
| Sep 8, 2017 | Electrical | Permit for the rebuild of damaged service meter feed on alley building. | $700 | [PMT2017-03856-ELE](https://nearbypermits.com/boulder/permit/PMT2017-03856-ELE/) |
| Nov 7, 2000 | Mechanical (HVAC) | Replace a residential forced air furnace. | $1,059 | [PMT2000-04578-MEC](https://nearbypermits.com/boulder/permit/PMT2000-04578-MEC/) |
| May 17, 1989 | Roofing | Roofing reroof with three tab | $1,000 | [PMT1989-P2603-RFG](https://nearbypermits.com/boulder/permit/PMT1989-P2603-RFG/) |
| Aug 18, 1988 | Mechanical (HVAC) | Mechanical replace furnace | $849 | [PMT1988-N0496-MEC](https://nearbypermits.com/boulder/permit/PMT1988-N0496-MEC/) |

## More on this street

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

- [2340 Walnut St](https://nearbypermits.com/boulder/address/2340-walnut-st/): newest permit Sep 18, 2025
- [2333 Walnut St](https://nearbypermits.com/boulder/address/2333-walnut-st/): newest permit Aug 22, 2025
- [2317 Walnut St](https://nearbypermits.com/boulder/address/2317-walnut-st/): newest permit Jul 31, 2025
- [2315 Walnut St](https://nearbypermits.com/boulder/address/2315-walnut-st/): newest permit May 13, 2026
- [2401 Walnut St 7](https://nearbypermits.com/boulder/address/2401-walnut-st-7/): newest permit Nov 15, 2024
- [2408 Walnut St](https://nearbypermits.com/boulder/address/2408-walnut-st/): newest permit Oct 14, 2025
- [2247 Walnut St](https://nearbypermits.com/boulder/address/2247-walnut-st/): newest permit Aug 26, 2026
- [2455 Walnut St](https://nearbypermits.com/boulder/address/2455-walnut-st/): newest permit Sep 30, 2025
- [2463 Walnut St](https://nearbypermits.com/boulder/address/2463-walnut-st/): newest permit May 21, 2026
- [2465 Walnut St 1](https://nearbypermits.com/boulder/address/2465-walnut-st-1/): newest permit Jun 9, 2026

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Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-06 13:54 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

All 7 permits at this address: https://nearbypermits.com/boulder/address/2345-walnut-st/