# Building permits at 420 S 43rd St, Boulder, CO

Six permits on record here. The newest, Jul 23: Add 1 new window and enlarge 1 existing window. 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 23, 2026 | Alteration or repair | Add 1 new window and enlarge 1 existing window for single family dwelling | $7,500 | [BLD-SFD2026-00404](https://nearbypermits.com/boulder/permit/BLD-SFD2026-00404/) |
| Aug 20, 2010 | Plumbing | Interior remodel of 1800 square feet in existing single family dwelling. Total of six bedrooms and three bathrooms. Garage converted to living space by previous owner. | $1,500 | [PMT2010-03048-PLB](https://nearbypermits.com/boulder/permit/PMT2010-03048-PLB/) |
| Aug 20, 2010 | Mechanical (HVAC) | Interior remodel of 1800 square feet in existing single family dwelling. Total of six bedrooms and three bathrooms. Garage converted to living space by previous owner. | $1,000 | [PMT2010-03048-MEC](https://nearbypermits.com/boulder/permit/PMT2010-03048-MEC/) |
| Aug 20, 2010 | Electrical | Interior remodel of 1800 square feet in existing single family dwelling. Total of six bedrooms and three bathrooms. Garage converted to living space by previous owner. | $2,500 | [PMT2010-03048-ELE](https://nearbypermits.com/boulder/permit/PMT2010-03048-ELE/) |
| Aug 20, 2010 | Alteration or repair | Interior remodel of 1800 square feet in existing single family dwelling. Total of six bedrooms and three bathrooms. Garage converted to living space by previous owner. | $108,684 | [PMT2010-03048](https://nearbypermits.com/boulder/permit/PMT2010-03048/) |
| Jul 2, 2010 | Demolition | Demo Permit - For interior non-structural demo of existing walls in basement and first floor of SFD. | Not listed | [PMT2010-02688-DEM](https://nearbypermits.com/boulder/permit/PMT2010-02688-DEM/) |

## 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 43rd St with permits, nearest house number first:

- [415 S 43rd St](https://nearbypermits.com/boulder/address/415-s-43rd-st/): newest permit May 2, 2025
- [410 S 43rd St](https://nearbypermits.com/boulder/address/410-s-43rd-st/): newest permit Jun 27, 2025
- [435 S 43rd St](https://nearbypermits.com/boulder/address/435-s-43rd-st/): newest permit Sep 14, 2026
- [440 S 43rd St](https://nearbypermits.com/boulder/address/440-s-43rd-st/): newest permit Oct 21, 2024
- [380 S 43rd St](https://nearbypermits.com/boulder/address/380-s-43rd-st/): newest permit Jan 24, 2025
- [370 S 43rd St](https://nearbypermits.com/boulder/address/370-s-43rd-st/): newest permit Mar 25, 2025
- [365 S 43rd St](https://nearbypermits.com/boulder/address/365-s-43rd-st/): newest permit Sep 5, 2025
- [355 S 43rd St](https://nearbypermits.com/boulder/address/355-s-43rd-st/): newest permit Aug 11, 2026
- [505 S 43rd St](https://nearbypermits.com/boulder/address/505-s-43rd-st/): newest permit May 19, 2025
- [510 S 43rd St](https://nearbypermits.com/boulder/address/510-s-43rd-st/): newest permit Jun 22, 2026

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Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-12 09:49 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

All 6 permits at this address: https://nearbypermits.com/boulder/address/420-s-43rd-st/