# Building permits at 70 S 31st St, Boulder, CO

Three permits on record here. The newest, Jul 8, 2025: 5.04 kW DC roof mounted PV expansion. 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 |
|---|---|---|---|---|
| Jul 8, 2025 | Electrical | 5.04 kW DC roof mounted PV expansion | $17,500 | [ELE2025-00452](https://nearbypermits.com/boulder/permit/ELE2025-00452/) |
| Nov 16, 2021 | Electrical | Installation of a 3.24kWdc Ballasted Photovoltaic array | $4,276 | [ELE2021-01771](https://nearbypermits.com/boulder/permit/ELE2021-01771/) |
| Feb 22, 2021 | Addition | *Addition and remodel of existing residence, resulting in 4 bedrooms (includes 'office' at first floor). Approved under HIS2020-00196 | $312,831 | [BLD-SFD2020-00371](https://nearbypermits.com/boulder/permit/BLD-SFD2020-00371/) |

## 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:

- [50 S 31st St](https://nearbypermits.com/boulder/address/50-s-31st-st/): newest permit Oct 7, 2025
- [90 S 31st St](https://nearbypermits.com/boulder/address/90-s-31st-st/): newest permit Dec 10, 2025
- [105 S 31st St](https://nearbypermits.com/boulder/address/105-s-31st-st/): newest permit Apr 9, 2026
- [120 S 31st St](https://nearbypermits.com/boulder/address/120-s-31st-st/): newest permit Sep 15, 2026
- [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 2026-10-09 14:42 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/70-s-31st-st/