# Building permits at 3639 21st St, Boulder, CO 13 permits on record here. The newest, Dec 6, 2024: Residential rooftop Solar PV 27.7Kw. 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 | |---|---|---|---|---| | Dec 6, 2024 | Electrical | Residential rooftop Solar PV 27.7Kw | $58,500 | [ELE2024-00908](https://nearbypermits.com/boulder/permit/ELE2024-00908/) | | Feb 16, 2023 | Pool or spa | In-ground concrete swimming pool (40' x 20' x 23'07" x 12' x 16'05" x 8') and in-ground concrete spa (7'09" x 6') with automatic safety covers as barriers. | $306,800 | [BLD-ACC2022-00091](https://nearbypermits.com/boulder/permit/BLD-ACC2022-00091/) | | Feb 15, 2022 | Plumbing | The proposed project is for the alteration of an existing 3-level residence. The total area of the proposed house, including unfinished areas, will be 9,114 sf. The existing residence has a total finished area of 7,180 sf and proposed alterations will result in a total finished area of 7,173 sf. Two | $78,300 | [PLB2021-00639](https://nearbypermits.com/boulder/permit/PLB2021-00639/) | | Feb 15, 2022 | Mechanical (HVAC) | The proposed project is for the alteration of an existing 3-level residence. The total area of the proposed house, including unfinished areas, will be 9,114 sf. The existing residence has a total finished area of 7,180 sf and proposed alterations will result in a total finished area of 7,173 sf. Two | $55,000 | [MEC2021-01910](https://nearbypermits.com/boulder/permit/MEC2021-01910/) | | Feb 15, 2022 | Electrical | The proposed project is for the alteration of an existing 3-level residence. The total area of the proposed house, including unfinished areas, will be 9,114 sf. The existing residence has a total finished area of 7,180 sf and proposed alterations will result in a total finished area of 7,173 sf. Two | $106,500 | [ELE2021-01532](https://nearbypermits.com/boulder/permit/ELE2021-01532/) | | Feb 15, 2022 | Addition | The proposed project is for the alteration of an existing 3-level residence. The total area of the proposed house, including unfinished areas, will be 9,114 sf. The existing residence has a total finished area of 7,180 sf and proposed alterations will result in a total finished area of 7,173 sf. Two | $4,545,000 | [BLD-SFD2021-00512](https://nearbypermits.com/boulder/permit/BLD-SFD2021-00512/) | | Aug 31, 2007 | Electrical | Installation of 4.2 kw, solar roofing tile, photovoltaic system on single-family residence. | $27,600 | [PMT2007-03821-ELE](https://nearbypermits.com/boulder/permit/PMT2007-03821-ELE/) | | May 14, 2007 | Plumbing | New 7269 sf SFD, 5 bedrooms, three full bathrooms, one 3/4 bathroom and a powder room. 437 sf unfinished foor space, with a 936 sf attached garage, and deck areas of 1005 sf. Photovoltaic work by separate permit(s). | $35,000 | [PMT2007-00940-PLB](https://nearbypermits.com/boulder/permit/PMT2007-00940-PLB/) | | May 14, 2007 | Mechanical (HVAC) | New 7269 sf SFD, 5 bedrooms, three full bathrooms, one 3/4 bathroom and a powder room. 437 sf unfinished foor space, with a 936 sf attached garage, and deck areas of 1005 sf. Photovoltaic work by separate permit(s). | $71,400 | [PMT2007-00940-MEC](https://nearbypermits.com/boulder/permit/PMT2007-00940-MEC/) | | May 14, 2007 | Electrical | New 7269 sf SFD, 5 bedrooms, three full bathrooms, one 3/4 bathroom and a powder room. 437 sf unfinished foor space, with a 936 sf attached garage, and deck areas of 1005 sf. Photovoltaic work by separate permit(s). | $30,100 | [PMT2007-00940-ELE](https://nearbypermits.com/boulder/permit/PMT2007-00940-ELE/) | | May 14, 2007 | New building | New 7269 sf SFD, 5 bedrooms, three full bathrooms, one 3/4 bathroom and a powder room. 437 sf unfinished foor space, with a 936 sf attached garage, and deck areas of 1005 sf. Photovoltaic work by separate permit(s). | $879,586 | [PMT2007-00940](https://nearbypermits.com/boulder/permit/PMT2007-00940/) | | Nov 13, 1992 | New building | Plan check fee due on voided permit no s6839 04/27 the original general permit | Not listed | [PMT1992-04686](https://nearbypermits.com/boulder/permit/PMT1992-04686/) | | Apr 27, 1992 | New building | Single family dwelling att garage partial finishe the original general permit | $274,000 | [PMT1992-06839](https://nearbypermits.com/boulder/permit/PMT1992-06839/) | ## 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 21st St with permits, nearest house number first: - [3633 21st St](https://nearbypermits.com/boulder/address/3633-21st-st/): newest permit Oct 10, 2024 - [3621 21st St](https://nearbypermits.com/boulder/address/3621-21st-st/): newest permit Jun 24, 2026 - [3867 21st St](https://nearbypermits.com/boulder/address/3867-21st-st/): newest permit May 4, 2026 - [2980 21st St](https://nearbypermits.com/boulder/address/2980-21st-st/): newest permit Jul 20, 2026 - [2941 21st St](https://nearbypermits.com/boulder/address/2941-21st-st/): newest permit Nov 18, 2025 - [2921 21st St](https://nearbypermits.com/boulder/address/2921-21st-st/): newest permit Oct 7, 2025 - [2881 21st St](https://nearbypermits.com/boulder/address/2881-21st-st/): newest permit Sep 23, 2026 - [2860 21st St](https://nearbypermits.com/boulder/address/2860-21st-st/): newest permit Aug 18, 2026 - [2820 21st St](https://nearbypermits.com/boulder/address/2820-21st-st/): newest permit Jul 28, 2026 - [2327 21st St](https://nearbypermits.com/boulder/address/2327-21st-st/): newest permit Aug 25, 2026 --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-10 11:03 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 13 permits at this address: https://nearbypermits.com/boulder/address/3639-21st-st/