# Building permits at 1375 Walnut St, Boulder, CO 50 permits on record here. The newest, May 7: Installation of a new roof-mounted chiller plant to provide consistent support for the tenant's laboratory. 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 7, 2026 | Roofing | Installation of a new roof-mounted chiller plant to provide consistent support for the tenant's laboratory equipment uses throughout the building. Project involves the installation of new equipment and support in an existing mechanical room, with utilities routed up to a new rooftop modular chiller. | $940,000 | [BLD-NRE2026-00020](https://nearbypermits.com/boulder/permit/BLD-NRE2026-00020/) | | Feb 4, 2026 | Alteration or repair | Level 2 concealed connection between existing buildings located on separate properties. A 2' vertical offset between building floor plates requires construction of a new landing and installation of a new wheelchair lift per plans. Minor electrical and HVAC adjustments, no plumbing and no visible cha | $138,164 | [BLD-NRE2025-00071](https://nearbypermits.com/boulder/permit/BLD-NRE2025-00071/) | | Apr 25, 2024 | Fire systems | Preaction system detection system (FAN) | $27,049 | [FIR2024-00146](https://nearbypermits.com/boulder/permit/FIR2024-00146/) | | Feb 2, 2024 | Fire systems | This project scope consists of an Existing, Fully Sprinkled, Non-Highrise Building. The Primary Occupancy Group(s) listed for this facility include B (Business) and A-3 (Assembly). TECH Electronics installed the Fire Alarm System in this facility. The Fire Alarm System will be a Fully Addressable Sy | $17,831 | [FIR2024-00005](https://nearbypermits.com/boulder/permit/FIR2024-00005/) | | Jan 30, 2024 | Fire systems | 2 clean agent systems, one for Cleanroom 027 and one for PAL 023. to accommodate a tenant finish on the basement level. See BLD-NRE2023-00120 for general building permit. See FIR2024-00005 for fire alarm permit. See FIR2023-00498 for fire sprinkler permit. Swri ti colorado building basement (v) | $67,223 | [FIR2024-00006](https://nearbypermits.com/boulder/permit/FIR2024-00006/) | | Jan 11, 2024 | Fire systems | Additions / alterations to the existing wet pipe fire sprinkler system to accommodate a tenant finish on the basement level. See BLD-NRE2023-00121 for general building permit. See FIR2024-00005 for fire alarm permit. See FIR2024-00006 for clean agent suppression system permit. Swri ti colorado build | $35,421 | [FIR2023-00498](https://nearbypermits.com/boulder/permit/FIR2023-00498/) | | Nov 13, 2023 | Alteration or repair | Tenant improvements to a core and shell building including the sub-level and a small portion of level one. Newt.i. Work inlcudes offices and workspaces (8,639 sf) and a mechanical space (3,518 sf) 12/01/23 tenant improvements to a core and shell building including the sub-level and a small portion o | $5,830,268 | [BLD-NRE2023-00121](https://nearbypermits.com/boulder/permit/BLD-NRE2023-00121/) | | Aug 22, 2023 | Demolition | VOIDED DUE TO INACTIVITY OVER 180 DAYS Demolition Application for non-structural interior office space of the sub-level and a portion of level 1 of 1375 Walnut Street. Demolition plan includes removal of mechanical, electrical, and plumbing systems, as well as architectural features including floori | Not listed | [DEM2023-00055](https://nearbypermits.com/boulder/permit/DEM2023-00055/) | | Jul 11, 2017 | Electrical | Interior finish work to include install new light fixtures, installation of a wood ceiling grill and relamping existing light fixtures. *11/15/17 Scope updated: No longer installing wood ceiling grill, instead installing custom metal paneling on the free-standing directory structure and the ceiling | $7,582 | [PMT2017-01809-ELE](https://nearbypermits.com/boulder/permit/PMT2017-01809-ELE/) | | Jul 11, 2017 | Alteration or repair | Interior finish work to include install new light fixtures, installation of a wood ceiling grill and relamping existing light fixtures. *11/15/17 Scope updated: No longer installing wood ceiling grill, instead installing custom metal paneling on the free-standing directory structure and the ceiling | $45,000 | [PMT2017-01809](https://nearbypermits.com/boulder/permit/PMT2017-01809/) | | Jul 11, 2016 | Fire systems | Fs - es - tf for office space | $3,840 | [PMT2016-03108-FIR](https://nearbypermits.com/boulder/permit/PMT2016-03108-FIR/) | | Apr 1, 2016 | Fire systems | Fs - es - tf for navigant (2nd floor only) | $5,000 | [PMT2016-01283-FIR](https://nearbypermits.com/boulder/permit/PMT2016-01283-FIR/) | | Mar 17, 2016 | Fire systems | Fs - es - tf for 1st floor elevator lobby only | $5,000 | [PMT2016-01099-FIR](https://nearbypermits.com/boulder/permit/PMT2016-01099-FIR/) | | Jan 11, 2016 | Fire systems | Fs - es - modification to existing office space (navigant) | $24,000 | [PMT2015-05127-FIR](https://nearbypermits.com/boulder/permit/PMT2015-05127-FIR/) | | Jan 7, 2016 | Fire systems | Fs - es - tf for elevator lobbies fl 4-8 | $12,000 | [PMT2015-03846-FIR](https://nearbypermits.com/boulder/permit/PMT2015-03846-FIR/) | | Dec 2, 2015 | Fire systems | Fa - es - tf for office space (1st & 2nd floors) | $6,203 | [PMT2015-05234-FIR](https://nearbypermits.com/boulder/permit/PMT2015-05234-FIR/) | | Nov 24, 2015 | Fire systems | Fs - es - tf for office space | $2,282 | [PMT2015-05198-FIR](https://nearbypermits.com/boulder/permit/PMT2015-05198-FIR/) | | Oct 7, 2015 | Plumbing | Interior tenant remodel to Colorado Building - Unit #200. Scope includes renovation of first and second floor for 'Navigant' professional office space. Incldues MEPs. | $52,000 | [PMT2015-03528-PLB](https://nearbypermits.com/boulder/permit/PMT2015-03528-PLB/) | | Oct 7, 2015 | Mechanical (HVAC) | Interior tenant remodel to Colorado Building - Unit #200. Scope includes renovation of first and second floor for 'Navigant' professional office space. Incldues MEPs. | $120,000 | [PMT2015-03528-MEC](https://nearbypermits.com/boulder/permit/PMT2015-03528-MEC/) | | Oct 7, 2015 | Alteration or repair | Interior tenant remodel to Colorado Building - Unit #200. Scope includes renovation of first and second floor for 'Navigant' professional office space. Incldues MEPs. | $1,624,473 | [PMT2015-03528](https://nearbypermits.com/boulder/permit/PMT2015-03528/) | | Oct 25, 2004 | Sign | New electrical wall sign "Guaranty Bank" | $5,000 | [PMT2004-03904-SGN](https://nearbypermits.com/boulder/permit/PMT2004-03904-SGN/) | | Oct 25, 2004 | Electrical | New electrical wall sign "Guaranty Bank" | Not listed | [PMT2004-03904-ELE](https://nearbypermits.com/boulder/permit/PMT2004-03904-ELE/) | | Feb 26, 2004 | Fire systems | Fire Alarm System - Guarenty Bank | $700 | [PMT2004-00628-FIR](https://nearbypermits.com/boulder/permit/PMT2004-00628-FIR/) | | Feb 25, 2004 | Sign | And one internally illuminated wall sign with blank face. See also PMT 2004-00267, PMT2004-00268 and PMT 2004-00269. for other signs this same address. | $500 | [PMT2004-00403-SGN](https://nearbypermits.com/boulder/permit/PMT2004-00403-SGN/) | | Feb 25, 2004 | Electrical | And one internally illuminated wall sign with blank face. See also PMT 2004-00267, PMT2004-00268 and PMT 2004-00269. for other signs this same address. | $100 | [PMT2004-00403-ELE](https://nearbypermits.com/boulder/permit/PMT2004-00403-ELE/) | | Feb 25, 2004 | Electrical | Two internally illuminated wall signs, one reading "GUARANTY BANK", one reading "ATM", and one externally illuminated suspended sign reading "GUARANTY BANK". See also PMT 2004-00267, and PMT 2004-00268 for other signs this same address. | $100 | [PMT2004-00269-ELE](https://nearbypermits.com/boulder/permit/PMT2004-00269-ELE/) | | Jan 22, 2004 | Plumbing | Tenant remodel. | $3,000 | [PMT2004-00259-PLB](https://nearbypermits.com/boulder/permit/PMT2004-00259-PLB/) | | Jan 22, 2004 | Mechanical (HVAC) | Tenant remodel. | $3,500 | [PMT2004-00259-MEC](https://nearbypermits.com/boulder/permit/PMT2004-00259-MEC/) | | Jan 22, 2004 | Alteration or repair | Tenant remodel. | $110,000 | [PMT2004-00259](https://nearbypermits.com/boulder/permit/PMT2004-00259/) | | Jan 25, 1999 | Electrical | Electrical install 2 outlets in 9th floor elevator room | $495 | [PMT1999-00667-ELE](https://nearbypermits.com/boulder/permit/PMT1999-00667-ELE/) | | Jul 2, 1998 | Sign | Sign replace a permanent electric sign | $3,000 | [PMT1998-04084-SGN](https://nearbypermits.com/boulder/permit/PMT1998-04084-SGN/) | | Jul 2, 1998 | Sign | Sign replace a permanent electric sign | $3,000 | [PMT1998-04082-SGN](https://nearbypermits.com/boulder/permit/PMT1998-04082-SGN/) | | Jun 30, 1998 | Electrical | Electrical reconnect sign w/ existing circuit | $190 | [PMT1998-04291-ELE](https://nearbypermits.com/boulder/permit/PMT1998-04291-ELE/) | | Mar 11, 1996 | Sign | Sign signage on awning | $1,087 | [PMT1996-01470-SGN](https://nearbypermits.com/boulder/permit/PMT1996-01470-SGN/) | | Nov 6, 1995 | Electrical | Electrical electrical on tenant finish unit 225. | $1,500 | [PMT1995-08300-ELE](https://nearbypermits.com/boulder/permit/PMT1995-08300-ELE/) | | Nov 3, 1995 | Alteration or repair | Move wall in unit 225. The original general permit number is 958201. | $3,000 | [PMT1995-08201](https://nearbypermits.com/boulder/permit/PMT1995-08201/) | | Jun 21, 1995 | Sign | Sign erect a permanent electric sign | $2,000 | [PMT1995-03956-SGN](https://nearbypermits.com/boulder/permit/PMT1995-03956-SGN/) | | May 23, 1995 | Electrical | Electrical electrical wiring for sign | $100 | [PMT1995-03883-ELE](https://nearbypermits.com/boulder/permit/PMT1995-03883-ELE/) | | Jan 2, 1992 | Electrical | Electrical ten fnsh wiring | $500 | [PMT1992-S4103-ELE](https://nearbypermits.com/boulder/permit/PMT1992-S4103-ELE/) | | Jan 2, 1992 | Alteration or repair | Tenant finish the original general permit number is 3803. | $7,000 | [PMT1991-03803](https://nearbypermits.com/boulder/permit/PMT1991-03803/) | | Jan 28, 1991 | Alteration or repair | Facia rmdl. The original general permit number is r4855. | $30,000 | [PMT1990-R4855](https://nearbypermits.com/boulder/permit/PMT1990-R4855/) | | Oct 17, 1990 | Sign | Sign elec sign | $750 | [PMT1990-R3736-SGN](https://nearbypermits.com/boulder/permit/PMT1990-R3736-SGN/) | | Oct 16, 1990 | Electrical | Electrical elec sign hook up | Not listed | [PMT1990-R3954-ELE](https://nearbypermits.com/boulder/permit/PMT1990-R3954-ELE/) | | Oct 2, 1990 | Sign | Sign 30 day non elec banner | $100 | [PMT1990-R3594-SGN](https://nearbypermits.com/boulder/permit/PMT1990-R3594-SGN/) | | Feb 13, 1990 | Sign | Sign non elec sign | $2,040 | [PMT1990-P8391-SGN](https://nearbypermits.com/boulder/permit/PMT1990-P8391-SGN/) | | Dec 29, 1989 | Sign | Sign non elec sign | Not listed | [PMT1989-P7537-SGN](https://nearbypermits.com/boulder/permit/PMT1989-P7537-SGN/) | | Jun 26, 1989 | Alteration or repair | Patio railing. The original general permit number is p3273. | $600 | [PMT1989-P3273](https://nearbypermits.com/boulder/permit/PMT1989-P3273/) | | Jun 5, 1989 | Alteration or repair | Alteration. The original general permit number is p2976. | $2,400 | [PMT1989-P2976](https://nearbypermits.com/boulder/permit/PMT1989-P2976/) | | Jul 22, 1988 | Electrical | Electrical wire basement remodel | $500 | [PMT1988-M9839-ELE](https://nearbypermits.com/boulder/permit/PMT1988-M9839-ELE/) | | Jul 21, 1988 | Alteration or repair | Remodel bsmt. The original general permit number is m9783. | $5,000 | [PMT1988-M9783](https://nearbypermits.com/boulder/permit/PMT1988-M9783/) | ## More on this street Other addresses on Walnut St with permits, nearest house number first: - [1360 Walnut St 103](https://nearbypermits.com/boulder/address/1360-walnut-st-103/): newest permit Sep 4, 2026 - [1401 Walnut St](https://nearbypermits.com/boulder/address/1401-walnut-st/): newest permit Aug 7, 2026 - [1301 Walnut St](https://nearbypermits.com/boulder/address/1301-walnut-st/): newest permit Jul 1, 2026 - [1300 Walnut St](https://nearbypermits.com/boulder/address/1300-walnut-st/): newest permit Jul 25, 2025 - [1470 Walnut St](https://nearbypermits.com/boulder/address/1470-walnut-st/): newest permit Mar 20, 2026 - [1545 Walnut St](https://nearbypermits.com/boulder/address/1545-walnut-st/): newest permit Jun 9, 2025 - [1175 Walnut St](https://nearbypermits.com/boulder/address/1175-walnut-st/): newest permit Oct 31, 2025 - [1603 Walnut St](https://nearbypermits.com/boulder/address/1603-walnut-st/): newest permit Jul 20, 2026 - [1620 Walnut St](https://nearbypermits.com/boulder/address/1620-walnut-st/): newest permit May 13, 2025 - [1634 Walnut St C](https://nearbypermits.com/boulder/address/1634-walnut-st-c/): newest permit Sep 24, 2026 --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-06 17:45 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 50 permits at this address: https://nearbypermits.com/boulder/address/1375-walnut-st/