# Building permits at 1743 Walnut St, Boulder, CO 26 permits on record here. The newest, Apr 15, 2025: VOIDED DUE TO INACTIVITY OVER 180 DAYS Permit for the replacement of guard rail at the edge of a mezzanine. 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 | |---|---|---|---|---| | Apr 15, 2025 | Alteration or repair | VOIDED DUE TO INACTIVITY OVER 180 DAYS Permit for the replacement of guard rail at the edge of a mezzanine area in a tenant office suite. | $4,870 | [PMT2018-01173](https://nearbypermits.com/boulder/permit/PMT2018-01173/) | | Jan 6, 2021 | Electrical | *Replace 3 wall packs and remove 2 others to comply with outdoor lighting ordinance. | $1,625 | [ELE2020-01825](https://nearbypermits.com/boulder/permit/ELE2020-01825/) | | Mar 20, 2020 | Fire systems | Installation of a fire-lite ms-5ud3 facp to replace the existing kidde kas-200 facp emergency replacement of existing panel. | $1,735 | [FIR2020-00106](https://nearbypermits.com/boulder/permit/FIR2020-00106/) | | Dec 4, 2018 | Fire systems | Add (7) new QR Pendent sprinkler heads to new kitchen and bathrooms | $1,500 | [FIR2018-00317](https://nearbypermits.com/boulder/permit/FIR2018-00317/) | | Oct 4, 2018 | Plumbing | Interior tenant remodel of 438 sf to convert 300 sf of storage space into staff kitchen and convert existing 138 sf breakroom into 2 toilet rooms (one fully accessible). Includes associated MEP. | $7,000 | [PLB2018-00370](https://nearbypermits.com/boulder/permit/PLB2018-00370/) | | Oct 4, 2018 | Electrical | Interior tenant remodel of 438 sf to convert 300 sf of storage space into staff kitchen and convert existing 138 sf breakroom into 2 toilet rooms (one fully accessible). Includes associated MEP. | $4,000 | [ELE2018-00738](https://nearbypermits.com/boulder/permit/ELE2018-00738/) | | Oct 4, 2018 | Alteration or repair | Interior tenant remodel of 438 sf to convert 300 sf of storage space into staff kitchen and convert existing 138 sf break room into 2 toilet rooms (one fully accessible). Includes associated MEP. 11/20/18 Scope Change: non-bearing partition removal and interior office windows; electrical receptacles | $95,000 | [BLD-NRE2018-00126](https://nearbypermits.com/boulder/permit/BLD-NRE2018-00126/) | | Aug 24, 2018 | Demolition | Interior, non-structural demolition of an existing office space in preparation for tenant remodel covered under BLD-NRE2018-00126. | Not listed | [DEM2018-00058](https://nearbypermits.com/boulder/permit/DEM2018-00058/) | | May 2, 2018 | Mechanical (HVAC) | Installation of (2) replacement RTU?s on an existing commercial building, 90k Btu/h, 12.2 EER, 81% efficient, single-package, heating and cooling unit, like for like in same location. Installation per manufacturer's specifications. | $27,959 | [MEC2018-00206](https://nearbypermits.com/boulder/permit/MEC2018-00206/) | | Apr 27, 2018 | Plumbing | Unit 3: Tenant Remodel- Remove three existing non-load bearing walls, cut down existing wall to counter height, dry wall existing opening, erect one partition wall and cut drywall to install two pass through cabinets. Scope update 4/27/18- Addition of hand sink and reconstruction of half wall. | $1,500 | [PLB2018-00078](https://nearbypermits.com/boulder/permit/PLB2018-00078/) | | Apr 26, 2018 | Electrical | Tenant Remodel- Remove three existing non-load bearing walls, cut down existing wall to counter height, dry wall existing opening, erect one partition wall and cut drywall to install two pass through cabinets. | $2,000 | [ELE2018-00140](https://nearbypermits.com/boulder/permit/ELE2018-00140/) | | Apr 26, 2018 | Alteration or repair | Unit 3: Tenant Remodel- Remove three existing non-load bearing walls, cut down existing wall to counter height, dry wall existing opening, erect one partition wall and cut drywall to install two pass through cabinets. Scope update 4/27/18- Addition of hand sink and reconstruction of half wall. | $31,620 | [BLD-NRE2018-00024](https://nearbypermits.com/boulder/permit/BLD-NRE2018-00024/) | | Apr 18, 2018 | Alteration or repair | Interior tenant remodel to an existing office suite to demise one suite into two (Suites 3 and 4) on the second floor and to install an interior ramp at the entrance to Suite 2 on the main floor....... | $2,846 | [BLD-NRE2018-00015](https://nearbypermits.com/boulder/permit/BLD-NRE2018-00015/) | | Nov 8, 2017 | Demolition | Interior, non-structural demolition of office partition walls. Approximately 3166 sf area of demolition. No associated MEP's covered within the scope of this permit. | Not listed | [PMT2017-04905-DEM](https://nearbypermits.com/boulder/permit/PMT2017-04905-DEM/) | | Jun 9, 2014 | Fire systems | Fa - radio | $500 | [PMT2014-02612-FIR](https://nearbypermits.com/boulder/permit/PMT2014-02612-FIR/) | | Jan 10, 2013 | Roofing | Roof overlay of 53 squares Verisco Ballasted 60-mil EPDM at 1/4" per foot slope. Includes addition of 5" rigid insulation for combined r-value of 20.7. | $30,957 | [PMT2013-00139-RFG](https://nearbypermits.com/boulder/permit/PMT2013-00139-RFG/) | | Apr 7, 2010 | Fire systems | New Backflow Preventor For SPS Studios | $5,345 | [PMT2010-01236-FIR](https://nearbypermits.com/boulder/permit/PMT2010-01236-FIR/) | | Sep 23, 2009 | Plumbing | Installation of back flow prevention. | $1,500 | [PMT2009-03801-PLB](https://nearbypermits.com/boulder/permit/PMT2009-03801-PLB/) | | Jul 28, 2008 | Mechanical (HVAC) | Replace roof top unit, 100,000 BTU. | $9,280 | [PMT2008-03198-MEC](https://nearbypermits.com/boulder/permit/PMT2008-03198-MEC/) | | Jun 3, 2008 | Electrical | new flat roof mount PV system 8.4 KW | $53,069 | [PMT2008-02214-ELE](https://nearbypermits.com/boulder/permit/PMT2008-02214-ELE/) | | Mar 22, 2002 | Fire systems | Fire Sprinkler System - blue mountain arts | $850 | [PMT2002-00995-FIR](https://nearbypermits.com/boulder/permit/PMT2002-00995-FIR/) | | Oct 14, 1994 | Alteration or repair | Install windows in block wall the original general permit number is 947750. | $2,600 | [PMT1994-07750](https://nearbypermits.com/boulder/permit/PMT1994-07750/) | | May 31, 1990 | Alteration or repair | Reloc stair. The original general permit number is r0617. | $1,600 | [PMT1990-R0617](https://nearbypermits.com/boulder/permit/PMT1990-R0617/) | | Apr 15, 1988 | Mechanical (HVAC) | Mechanical roof top htg & a/c unit | $8,364 | [PMT1988-M7606-MEC](https://nearbypermits.com/boulder/permit/PMT1988-M7606-MEC/) | | Nov 13, 1987 | Fire systems | Fire relocate sprinkler heads | Not listed | [PMT1987-M5109-FIR](https://nearbypermits.com/boulder/permit/PMT1987-M5109-FIR/) | | Nov 2, 1987 | Alteration or repair | Tenant finish. The original general permit number is m4790. | $9,000 | [PMT1987-M4790](https://nearbypermits.com/boulder/permit/PMT1987-M4790/) | ## More on this street Other addresses on Walnut St with permits, nearest house number first: - [1734 Walnut St](https://nearbypermits.com/boulder/address/1734-walnut-st/): newest permit Oct 2, 2025 - [1726 Walnut St](https://nearbypermits.com/boulder/address/1726-walnut-st/): newest permit Oct 17, 2025 - [1708 Walnut St](https://nearbypermits.com/boulder/address/1708-walnut-st/): newest permit Feb 21, 2025 - [1707 Walnut St 106](https://nearbypermits.com/boulder/address/1707-walnut-st-106/): newest permit May 28, 2026 - [1802 Walnut St](https://nearbypermits.com/boulder/address/1802-walnut-st/): newest permit Oct 24, 2024 - [1818 Walnut St](https://nearbypermits.com/boulder/address/1818-walnut-st/): newest permit Sep 16, 2026 - [1819 Walnut St](https://nearbypermits.com/boulder/address/1819-walnut-st/): newest permit Dec 10, 2025 - [1655 Walnut St 301](https://nearbypermits.com/boulder/address/1655-walnut-st-301/): newest permit Jan 15, 2026 - [1634 Walnut St C](https://nearbypermits.com/boulder/address/1634-walnut-st-c/): newest permit Sep 24, 2026 - [1860 Walnut St 3](https://nearbypermits.com/boulder/address/1860-walnut-st-3/): newest permit Nov 6, 2024 --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-06 18:25 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 26 permits at this address: https://nearbypermits.com/boulder/address/1743-walnut-st/