# Building permits at 661 Maxwell Ave B, Boulder, CO

One permit on record here. The newest, Oct 21, 2025: *Voided for inactivity - no inspections for 180 days* Mitsubishi heat pump & AC. 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 |
|---|---|---|---|---|
| Oct 21, 2025 | Mechanical (HVAC) | *Voided for inactivity - no inspections for 180 days* Mitsubishi heat pump & AC. 2 wall units to 1 outdoor condenser. All new plastic glued vents for fuel burning appliances must undergo pressure testing. To facilitate the inspection process, please provide photographic evidence of the pressure test | $6,616 | [MEC2025-01775](https://nearbypermits.com/boulder/permit/MEC2025-01775/) |

## More on this street

Other addresses on Maxwell Ave with permits, nearest house number first:

- [665 Maxwell Ave](https://nearbypermits.com/boulder/address/665-maxwell-ave/): newest permit Oct 27, 2025
- [628 Maxwell Ave](https://nearbypermits.com/boulder/address/628-maxwell-ave/): newest permit Dec 5, 2025
- [624 Maxwell Ave](https://nearbypermits.com/boulder/address/624-maxwell-ave/): newest permit May 23, 2025
- [621 Maxwell Ave](https://nearbypermits.com/boulder/address/621-maxwell-ave/): newest permit May 12, 2025
- [707 Maxwell Ave](https://nearbypermits.com/boulder/address/707-maxwell-ave/): newest permit Nov 19, 2025
- [611 Maxwell Ave](https://nearbypermits.com/boulder/address/611-maxwell-ave/): newest permit Feb 18, 2026
- [716 Maxwell Ave](https://nearbypermits.com/boulder/address/716-maxwell-ave/): newest permit Oct 14, 2025
- [541 Maxwell Ave](https://nearbypermits.com/boulder/address/541-maxwell-ave/): newest permit Apr 11, 2025
- [536 Maxwell Ave](https://nearbypermits.com/boulder/address/536-maxwell-ave/): newest permit Apr 17, 2025
- [527 Maxwell Ave](https://nearbypermits.com/boulder/address/527-maxwell-ave/): newest permit Apr 11, 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 10:55 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/661-maxwell-ave-b/