# Building permits at 170 S 31st St, Boulder, CO

One permit on record here. The newest, Aug 4: Replace existing gas furnace with 2.5 ton 16.8 SEER2 heat pump for single family dwelling - includes. 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 4, 2026 | Mechanical (HVAC) | Replace existing gas furnace with 2.5 ton 16.8 SEER2 heat pump for single family dwelling - includes electrical 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 pr | $9,925 | [MEC2026-01300](https://nearbypermits.com/boulder/permit/MEC2026-01300/) |

## 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 S 31st St with permits, nearest house number first:

- [180 S 31st St](https://nearbypermits.com/boulder/address/180-s-31st-st/): newest permit Jun 9, 2026
- [120 S 31st St](https://nearbypermits.com/boulder/address/120-s-31st-st/): newest permit Sep 15, 2026
- [105 S 31st St](https://nearbypermits.com/boulder/address/105-s-31st-st/): newest permit Apr 9, 2026
- [90 S 31st St](https://nearbypermits.com/boulder/address/90-s-31st-st/): newest permit Dec 10, 2025
- [70 S 31st St](https://nearbypermits.com/boulder/address/70-s-31st-st/): newest permit Jul 8, 2025
- [50 S 31st St](https://nearbypermits.com/boulder/address/50-s-31st-st/): newest permit Oct 7, 2025
- [18 S 31st St](https://nearbypermits.com/boulder/address/18-s-31st-st/): newest permit Oct 7, 2025

---
Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-10 14:27 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/170-s-31st-st/