# Building permits at 891 12th St, Boulder, CO 18 permits on record here. The newest, Oct 8, 2025: Flat Panel Aluminum Non-Illuminated Sign to Identify Building. 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 | |---|---|---|---|---| | Oct 8, 2025 | Sign | Flat Panel Aluminum Non-Illuminated Sign to Identify Building | $514 | [SGN2025-00095](https://nearbypermits.com/boulder/permit/SGN2025-00095/) | | Oct 10, 2024 | Roofing | Remove existing dirt and concrete parking lot to correct existing waterproofing on a multi-family building. Interior work to performed under separate permit, BLD-MFD2024-00072. Replace dirt and concrete. Scope included a proposed attached roof structure over exterior stairs to lower level. Associate | $200,000 | [BLD-MFD2024-00070](https://nearbypermits.com/boulder/permit/BLD-MFD2024-00070/) | | Sep 27, 2024 | Demolition | Demo of walls in units that were built on top of previously permitted knee walls. Walls are to be demo'd out and knee wall is to remain per plan. Electrical receptacles will be moved to their original position and spacing to be per code. Units affected are as follows; 11, 12, 13, 21, 22, 24, 25, 32, | Not listed | [DEM2024-00066](https://nearbypermits.com/boulder/permit/DEM2024-00066/) | | Aug 12, 2024 | Alteration or repair | Permit for the repair of some interior assemblies and finishes due to water damage in a multifamily building. Associated exterior work under BLD-MFD2024-00070. Associated with ENF2024-00601. | $60,000 | [BLD-MFD2024-00072](https://nearbypermits.com/boulder/permit/BLD-MFD2024-00072/) | | Mar 21, 2022 | Plumbing | See attach1_891 12th street_09-03-2021 the following is from that attachment, which is in review files "reconfigure and reconstruct the interior layout of the building to replace the high-intensity group living quarters and large party rooms with 16 separate and self-contained residential units" | $567,542 | [PLB2021-00610](https://nearbypermits.com/boulder/permit/PLB2021-00610/) | | Mar 21, 2022 | Mechanical (HVAC) | See attach1_891 12th street_09-03-2021 the following is from that attachment, which is in review files "reconfigure and reconstruct the interior layout of the building to replace the high-intensity group living quarters and large party rooms with 16 separate and self-contained residential units" | $356,779 | [MEC2021-01836](https://nearbypermits.com/boulder/permit/MEC2021-01836/) | | Mar 21, 2022 | Electrical | See attach1_891 12th street_09-03-2021 the following is from that attachment, which is in review files "reconfigure and reconstruct the interior layout of the building to replace the high-intensity group living quarters and large party rooms with 16 separate and self-contained residential units" | $498,588 | [ELE2021-01478](https://nearbypermits.com/boulder/permit/ELE2021-01478/) | | Mar 21, 2022 | Alteration or repair | Reconfigure and reconstruct the interior layout of the building to create sixteen (16) separate and self-contained residential units. New electrical service, 1000 AMPs. Related to GRA2021-00008. | $7,869,841 | [BLD-MFD2021-00047](https://nearbypermits.com/boulder/permit/BLD-MFD2021-00047/) | | Feb 16, 2022 | Fire systems | AS-BUILTS AND CALCS FOR TOP FLOOR REMOTE AREA REQUIRED BEFORE FINAL INSPECTIONS New NFPA 13/13R wet pipe fire sprinkler system to accommodate the remodel of a structure to replace the high-intensity group living quarters and large party rooms with 16 separate and self-contained residential units. Se | $48,657 | [FIR2022-00036](https://nearbypermits.com/boulder/permit/FIR2022-00036/) | | Nov 10, 2021 | Fire systems | New fire alarm system for the remodel of a structure to replace the high-intensity group living quarters and large party rooms with 16 separate and self-contained residential units. See BLD-MFD20201-00047 for general building permit. See FIR2022-00036 for fire sprinkler permit. Ash house | $30,825 | [FIR2021-00366](https://nearbypermits.com/boulder/permit/FIR2021-00366/) | | Aug 2, 2017 | Electrical | Installation of a 4.32 kW grid tied flush mount PV system in one array on the flat roof section of the SE wing of a multifamily building. | $26,000 | [PMT2017-03292-ELE](https://nearbypermits.com/boulder/permit/PMT2017-03292-ELE/) | | May 3, 2013 | Roofing | Remove portion of existing roofing and re-roof with 60 mil EPDM. 6 sqaures, roof pitch represented by contractor to be 1/4:1. | $8,500 | [PMT2013-01858-RFG](https://nearbypermits.com/boulder/permit/PMT2013-01858-RFG/) | | Mar 8, 2011 | Fire systems | New Backflow Preventor | $1,600 | [PMT2011-00853-FIR](https://nearbypermits.com/boulder/permit/PMT2011-00853-FIR/) | | Oct 4, 2010 | Fire systems | Scope of Work Letter for Mariposa House | $225 | [PMT2010-03825-FIR](https://nearbypermits.com/boulder/permit/PMT2010-03825-FIR/) | | Aug 10, 2010 | Plumbing | Interior remodel in Marpa House to remodel mail room and 4 existing bedrooms to created 2 suites and 6 private bathrooms per ADR2010-00068. | $30,000 | [PMT2010-02615-PLB](https://nearbypermits.com/boulder/permit/PMT2010-02615-PLB/) | | Aug 10, 2010 | Electrical | Interior remodel in Marpa House to remodel mail room and 4 existing bedrooms to created 2 suites and 6 private bathrooms per ADR2010-00068. | $7,000 | [PMT2010-02615-ELE](https://nearbypermits.com/boulder/permit/PMT2010-02615-ELE/) | | Aug 10, 2010 | Alteration or repair | Interior remodel in Marpa House to remodel mail room and 4 existing bedrooms to created 2 suites and 6 private bathrooms per ADR2010-00068. | $76,000 | [PMT2010-02615](https://nearbypermits.com/boulder/permit/PMT2010-02615/) | | Jun 10, 2002 | Fence, wall or deck | Erect a new retaining wall along the north and east property lines. | $6,000 | [PMT2002-02401-FEN](https://nearbypermits.com/boulder/permit/PMT2002-02401-FEN/) | ## More on this street Other addresses on 12th St with permits, nearest house number first: - [907 12th St](https://nearbypermits.com/boulder/address/907-12th-st/): newest permit Dec 4, 2025 - [916 12th St](https://nearbypermits.com/boulder/address/916-12th-st/): newest permit May 16, 2025 - [845 12th St](https://nearbypermits.com/boulder/address/845-12th-st/): newest permit Oct 13, 2025 - [840 12th St](https://nearbypermits.com/boulder/address/840-12th-st/): newest permit Sep 29, 2025 - [830 12th St](https://nearbypermits.com/boulder/address/830-12th-st/): newest permit Jan 20, 2026 - [955 12th St](https://nearbypermits.com/boulder/address/955-12th-st/): newest permit Sep 28, 2026 - [820 12th St](https://nearbypermits.com/boulder/address/820-12th-st/): newest permit May 29, 2025 - [1045 12th St](https://nearbypermits.com/boulder/address/1045-12th-st/): newest permit May 27, 2025 - [735 12th St](https://nearbypermits.com/boulder/address/735-12th-st/): newest permit Oct 18, 2024 - [728 12th St](https://nearbypermits.com/boulder/address/728-12th-st/): newest permit Aug 8, 2025 --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-07 06:33 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 18 permits at this address: https://nearbypermits.com/boulder/address/891-12th-st/