# Building permits at 770 Walnut St B, Boulder, CO

One permit on record here. The newest, Aug 12: Installation of Heating cooling system with subcontractor electrical 1 1/2 ton 13.4 SEER2 Single-Stage iM Air. 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 |
|---|---|---|---|---|
| Aug 12, 2026 | Mechanical (HVAC) | Installation of Heating cooling system with subcontractor electrical 1 1/2 ton 13.4 SEER2 Single-Stage iM Air Conditioner &1.5 ton uncased Fan Coil PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning appliances must undergo pressure test | $15,194 | [MEC2026-01327](https://nearbypermits.com/boulder/permit/MEC2026-01327/) |

## More on this street

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

- [760 Walnut St](https://nearbypermits.com/boulder/address/760-walnut-st/): newest permit Mar 27, 2026
- [750 Walnut St](https://nearbypermits.com/boulder/address/750-walnut-st/): newest permit Sep 28, 2026
- [790 Walnut St B](https://nearbypermits.com/boulder/address/790-walnut-st-b/): newest permit Oct 27, 2025
- [812 Walnut St](https://nearbypermits.com/boulder/address/812-walnut-st/): newest permit Sep 28, 2026
- [824 Walnut St 46](https://nearbypermits.com/boulder/address/824-walnut-st-46/): newest permit Sep 9, 2026
- [711 Walnut St](https://nearbypermits.com/boulder/address/711-walnut-st/): newest permit Jun 3, 2026
- [848 Walnut St](https://nearbypermits.com/boulder/address/848-walnut-st/): newest permit Jun 22, 2026
- [854 Walnut St](https://nearbypermits.com/boulder/address/854-walnut-st/): newest permit May 27, 2026
- [921 Walnut St](https://nearbypermits.com/boulder/address/921-walnut-st/): newest permit Aug 5, 2026
- [613 Walnut St](https://nearbypermits.com/boulder/address/613-walnut-st/): newest permit Sep 18, 2026

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Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-07 00:07 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/770-walnut-st-b/