# Building permits at 3333 Walnut St, Boulder, CO

One permit here in the last two years. The newest, Nov 17, 2025: VOID- 180 Days no activity Replacing existing cooling tower. 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 |
|---|---|---|---|---|
| Nov 17, 2025 | Mechanical (HVAC) | VOID- 180 Days no activity Replacing existing cooling tower. PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning appliances must undergo pressure testing. To facilitate the inspection process, please provide photographic evidence of the  | $240,000 | [MEC2025-01889](https://nearbypermits.com/boulder/permit/MEC2025-01889/) |

## More on this street

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

- [3300 Walnut St](https://nearbypermits.com/boulder/address/3300-walnut-st/): newest permit Jun 2, 2025
- [3250 Walnut St](https://nearbypermits.com/boulder/address/3250-walnut-st/): newest permit May 16, 2025
- [3201 Walnut St](https://nearbypermits.com/boulder/address/3201-walnut-st/): newest permit Nov 18, 2025
- [3151 Walnut St](https://nearbypermits.com/boulder/address/3151-walnut-st/): newest permit Nov 8, 2024
- [3003 Walnut St](https://nearbypermits.com/boulder/address/3003-walnut-st/): newest permit Jul 31, 2025
- [3720 Walnut St](https://nearbypermits.com/boulder/address/3720-walnut-st/): newest permit Sep 15, 2026
- [3750 Walnut St](https://nearbypermits.com/boulder/address/3750-walnut-st/): newest permit Dec 20, 2024
- [2590 Walnut St](https://nearbypermits.com/boulder/address/2590-walnut-st/): newest permit Sep 15, 2026
- [2465 Walnut St 1](https://nearbypermits.com/boulder/address/2465-walnut-st-1/): newest permit Jun 9, 2026
- [2463 Walnut St](https://nearbypermits.com/boulder/address/2463-walnut-st/): newest permit May 21, 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 12:34 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/3333-walnut-st/