# Building permits at 2121 18th St, Boulder, CO

Five permits on record here. The newest, Sep 10: Install new 32K BTU 3 port mini-split heat pump condenser including electrical circuit needed for new heat. 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 |
|---|---|---|---|---|
| Sep 10, 2026 | Mechanical (HVAC) | Install new 32K BTU 3 port mini-split heat pump condenser including electrical circuit needed for new heat pump and verifying a GFCI outlet within 25' of condenser. PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning appliances must unde | $13,293 | [MEC2026-01679](https://nearbypermits.com/boulder/permit/MEC2026-01679/) |
| Aug 5, 2021 | Mechanical (HVAC) | install replacement 40 gallon 40k btu gas water heater | $2,292 | [MEC2021-01545](https://nearbypermits.com/boulder/permit/MEC2021-01545/) |
| May 27, 2015 | Electrical | 200 amp service change | $1,800 | [PMT2015-02035-ELE](https://nearbypermits.com/boulder/permit/PMT2015-02035-ELE/) |
| Nov 8, 1988 | Mechanical (HVAC) | Mechanical replace water heater | $380 | [PMT1988-N2492-MEC](https://nearbypermits.com/boulder/permit/PMT1988-N2492-MEC/) |
| Oct 15, 1987 | Alteration or repair | Remodel. The original general permit number is m4546. | $17,000 | [PMT1987-M4546](https://nearbypermits.com/boulder/permit/PMT1987-M4546/) |

## More on this street

Other addresses on 18th St with permits, nearest house number first:

- [2119 18th St](https://nearbypermits.com/boulder/address/2119-18th-st/): newest permit Sep 10, 2026
- [2016 18th St](https://nearbypermits.com/boulder/address/2016-18th-st/): newest permit Sep 12, 2025
- [2014 18th St](https://nearbypermits.com/boulder/address/2014-18th-st/): newest permit Mar 21, 2025
- [2008 18th St](https://nearbypermits.com/boulder/address/2008-18th-st/): newest permit Dec 16, 2025
- [2002 18th St](https://nearbypermits.com/boulder/address/2002-18th-st/): newest permit Jul 16, 2025
- [2255 18th St](https://nearbypermits.com/boulder/address/2255-18th-st/): newest permit Aug 14, 2026
- [1934 18th St](https://nearbypermits.com/boulder/address/1934-18th-st/): newest permit Jan 24, 2025
- [2338 18th St](https://nearbypermits.com/boulder/address/2338-18th-st/): newest permit Apr 2, 2026
- [2345 18th St](https://nearbypermits.com/boulder/address/2345-18th-st/): newest permit Dec 12, 2024
- [1820 18th St](https://nearbypermits.com/boulder/address/1820-18th-st/): newest permit Apr 29, 2026

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Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-06 22:55 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

All 5 permits at this address: https://nearbypermits.com/boulder/address/2121-18th-st/