# Building permits at 345 S 42nd St, Boulder, CO

Eight permits on record here. The newest, May 8: New 4 zone mini split heat pump for single family detached dwelling - includes electrical PLEASE NOTE. 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 |
|---|---|---|---|---|
| May 8, 2026 | Mechanical (HVAC) | new 4 zone mini split heat pump for single family detached 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 process, please provide  | $16,811 | [MEC2026-00729](https://nearbypermits.com/boulder/permit/MEC2026-00729/) |
| May 12, 2025 | Mechanical (HVAC) | Replace water heater | $1,172 | [MEC2025-00747](https://nearbypermits.com/boulder/permit/MEC2025-00747/) |
| Feb 23, 2024 | Electrical | *Voided for inactivity - no inspections within 180 days* roof mounted solar installation with service upgrade 6.72 kW 16 x REC 420 watts solar panels 2 x Tesla Powerwall 3 (11.5 kW on&off grid each) | $50,112 | [ELE2024-00149](https://nearbypermits.com/boulder/permit/ELE2024-00149/) |
| Nov 17, 2020 | Electrical | *Voided for inactivity - no inspections within 180 days* *Install 4.08kW roof mounted solar PV system with 13.5kWh Tesla Powerwall Energy Storage System | $13,748 | [ELE2020-01559](https://nearbypermits.com/boulder/permit/ELE2020-01559/) |
| May 19, 2015 | Roofing | Remove existing shingles and re-roof residence with dimensional shingles. 22.23 squares, roof pitch represented by contractor to be 5:12. | $7,724 | [PMT2015-01914-RFG](https://nearbypermits.com/boulder/permit/PMT2015-01914-RFG/) |
| Oct 10, 2012 | Mechanical (HVAC) | Replacement Forced Air Furnace | $1,800 | [PMT2012-20282-MEC](https://nearbypermits.com/boulder/permit/PMT2012-20282-MEC/) |
| Oct 23, 1998 | Alteration or repair | Install egress window the original general permit number is 986912. | $1,000 | [PMT1998-06912](https://nearbypermits.com/boulder/permit/PMT1998-06912/) |
| Nov 14, 1989 | Mechanical (HVAC) | Mechanical GAS FIREPLACE | $350 | [PMT1989-P6735-MEC](https://nearbypermits.com/boulder/permit/PMT1989-P6735-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 42nd St with permits, nearest house number first:

- [360 S 42nd St](https://nearbypermits.com/boulder/address/360-s-42nd-st/): newest permit Jun 2, 2026
- [365 S 42nd St](https://nearbypermits.com/boulder/address/365-s-42nd-st/): newest permit Dec 16, 2025
- [375 S 42nd St](https://nearbypermits.com/boulder/address/375-s-42nd-st/): newest permit May 15, 2026
- [420 S 42nd St](https://nearbypermits.com/boulder/address/420-s-42nd-st/): newest permit Mar 4, 2025
- [425 S 42nd St](https://nearbypermits.com/boulder/address/425-s-42nd-st/): newest permit Oct 24, 2025
- [430 S 42nd St](https://nearbypermits.com/boulder/address/430-s-42nd-st/): newest permit May 22, 2026
- [520 S 42nd St](https://nearbypermits.com/boulder/address/520-s-42nd-st/): newest permit May 14, 2026
- [530 S 42nd St](https://nearbypermits.com/boulder/address/530-s-42nd-st/): newest permit Mar 17, 2026
- [540 S 42nd St](https://nearbypermits.com/boulder/address/540-s-42nd-st/): newest permit Sep 4, 2026
- [145 S 42nd St](https://nearbypermits.com/boulder/address/145-s-42nd-st/): newest permit Oct 30, 2024

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Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-10 01:19 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

All 8 permits at this address: https://nearbypermits.com/boulder/address/345-s-42nd-st/