# Building permits at 90 S 31st St, Boulder, CO

Three permits on record here. The newest, Dec 10, 2025: Installation of a 3 Ton Mitsubishi Cold Climate Heat Pump System. 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 10, 2025 | Mechanical (HVAC) | Installation of a 3 Ton Mitsubishi Cold Climate Heat Pump System. Condenser Model# PUZ-AK36NLHZ, and AHU Model# PVA-AA36NL. Electrical scope of work is as follows: new 30A Breaker with circuit and GFCI Service Outlet PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plast | $5,606 | [MEC2025-02206](https://nearbypermits.com/boulder/permit/MEC2025-02206/) |
| Aug 16, 2011 | New building | Remove existing rear patio cover and replace with new 288 s.f., unenclosed patio cover at rear of residence. | $19,500 | [PMT2011-03495](https://nearbypermits.com/boulder/permit/PMT2011-03495/) |
| Aug 15, 2007 | Mechanical (HVAC) | Replacement Forced Air Furnace | $1,300 | [PMT2007-20234-MEC](https://nearbypermits.com/boulder/permit/PMT2007-20234-MEC/) |

## 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:

- [105 S 31st St](https://nearbypermits.com/boulder/address/105-s-31st-st/): newest permit Apr 9, 2026
- [70 S 31st St](https://nearbypermits.com/boulder/address/70-s-31st-st/): newest permit Jul 8, 2025
- [120 S 31st St](https://nearbypermits.com/boulder/address/120-s-31st-st/): newest permit Sep 15, 2026
- [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
- [170 S 31st St](https://nearbypermits.com/boulder/address/170-s-31st-st/): newest permit Aug 4, 2026
- [180 S 31st St](https://nearbypermits.com/boulder/address/180-s-31st-st/): 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 2026-10-08 22:24 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

All 3 permits at this address: https://nearbypermits.com/boulder/address/90-s-31st-st/