# Mechanical (HVAC) permit MEC2021-01865 at 311 Mapleton Ave, Boulder

Boulder Planning and Development Services permit MEC2021-01865: issued May 23, 2022 for mechanical (hvac) work at 311 Mapleton Ave. 2535/2537 4th Street (duplex): New construction of a 2-story duplex building with stair enclosure and attached single car garage. Fully Sprinklered. Unit J3 to be 4,378 GSF with 2 bedrooms and 3.5 bathrooms. Unit J4 to be 4,359 GSF with 3 bedrooms and 2 full baths, 2 powder rooms. The building materials shall include cultured stone, cementitious fiberboard siding, metal panel, glass railing, standing seam metal roof, overhead garage door, aluminum clad wood doors and windows.

- Permit number: MEC2021-01865
- Issued: May 23, 2022
- Type of work: Mechanical (HVAC) (city: Mechanical Permit, Mechanical Sub-Permit)
- Status: Finished (city: Closed)
- Reported cost: $15,000
- ZIP code: 80304
- All permits at this address: https://nearbypermits.com/boulder/address/311-mapleton-ave/

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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 14:09 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Every permit at 311 Mapleton Ave: https://nearbypermits.com/boulder/address/311-mapleton-ave/