# Building permits at 1545 Walnut St, Boulder, CO 60 permits on record here. The newest, Jun 9, 2025: Install a new backflow device (BFP). 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 | |---|---|---|---|---| | Jun 9, 2025 | Fire systems | Install a new backflow device (BFP) | $14,686 | [FIR2025-00194](https://nearbypermits.com/boulder/permit/FIR2025-00194/) | | Nov 17, 2011 | Sign | Replace non-illuminated wall sign "CenturyLink" | $200 | [PMT2011-04688-SGN](https://nearbypermits.com/boulder/permit/PMT2011-04688-SGN/) | | Sep 9, 2010 | Electrical | Electrical work related to disconnection of rooftop mechanical equipment and reconnection of replacement mechanical equipment. (Mechanical work by separate permit) | $7,000 | [PMT2010-03845-ELE](https://nearbypermits.com/boulder/permit/PMT2010-03845-ELE/) | | Jun 16, 2010 | Mechanical (HVAC) | Mechanical Permit - For replacement of 2 cooling towers on top of Qwest Communications building (same size and location). Tower performance = 95.0 gpm/hp. (Electrical by separate permit) | $219,932 | [PMT2010-02407-MEC](https://nearbypermits.com/boulder/permit/PMT2010-02407-MEC/) | | Sep 12, 2008 | Plumbing | Replace steel underground tank in parking lot of Qwest, with fiberglas tank New pipes and controls leak detector Hook up temporary back up generator. 3000 gal tank for diesel | $102,052 | [PMT2008-02432-PLB](https://nearbypermits.com/boulder/permit/PMT2008-02432-PLB/) | | Sep 12, 2008 | Electrical | Replace steel underground tank in parking lot of Qwest, with fiberglas tank New pipes and controls leak detector Hook up temporary back up generator. 3000 gal tank for diesel | $20,347 | [PMT2008-02432-ELE](https://nearbypermits.com/boulder/permit/PMT2008-02432-ELE/) | | Sep 12, 2008 | Alteration or repair | Replace steel underground tank in parking lot of Qwest, with fiberglas tank New pipes and controls leak detector Hook up temporary back up generator. 3000 gal tank for diesel | $72,064 | [PMT2008-02432](https://nearbypermits.com/boulder/permit/PMT2008-02432/) | | Apr 4, 2001 | Fire systems | Fire Alarm System | $24,000 | [PMT2001-01213-FIR](https://nearbypermits.com/boulder/permit/PMT2001-01213-FIR/) | | Feb 8, 2001 | Mechanical (HVAC) | Upgrade HVAC for 3rd floor, includes removal, replacement and installation of new rooftop mechanical equipment and electrical work. | $300,786 | [PMT2000-05066-MEC](https://nearbypermits.com/boulder/permit/PMT2000-05066-MEC/) | | Feb 8, 2001 | Electrical | Upgrade HVAC for 3rd floor, includes removal, replacement and installation of new rooftop mechanical equipment and electrical work. | $49,000 | [PMT2000-05066-ELE](https://nearbypermits.com/boulder/permit/PMT2000-05066-ELE/) | | Feb 8, 2001 | Alteration or repair | Upgrade HVAC for 3rd floor, includes removal, replacement and installation of new rooftop mechanical equipment and electrical work. | $350,000 | [PMT2000-05066](https://nearbypermits.com/boulder/permit/PMT2000-05066/) | | Nov 3, 2000 | Fire systems | Fire alarm system - basement | $4,000 | [PMT2000-04494-FIR](https://nearbypermits.com/boulder/permit/PMT2000-04494-FIR/) | | Oct 23, 2000 | Fire systems | Fire Alarm - 1st and 2nd floors | $70,000 | [PMT2000-04143-FIR](https://nearbypermits.com/boulder/permit/PMT2000-04143-FIR/) | | Oct 23, 2000 | Fire systems | Fire Alarm System - Basement | $30,000 | [PMT2000-04142-FIR](https://nearbypermits.com/boulder/permit/PMT2000-04142-FIR/) | | Oct 5, 2000 | Mechanical (HVAC) | First and second floor remodel with mechanical and electrical | $1,229,192 | [PMT2000-03524-MEC](https://nearbypermits.com/boulder/permit/PMT2000-03524-MEC/) | | Oct 5, 2000 | Electrical | First and second floor remodel with mechanical and electrical | $490,000 | [PMT2000-03524-ELE](https://nearbypermits.com/boulder/permit/PMT2000-03524-ELE/) | | Oct 5, 2000 | Alteration or repair | First and second floor remodel with mechanical and electrical | $2,015,523 | [PMT2000-03524](https://nearbypermits.com/boulder/permit/PMT2000-03524/) | | Aug 25, 2000 | Demolition | Interior demo only | Not listed | [PMT2000-03525-DEM](https://nearbypermits.com/boulder/permit/PMT2000-03525-DEM/) | | Jul 6, 2000 | Mechanical (HVAC) | Internal remodel on first, second and third floor | $105,753 | [PMT2000-02252-MEC](https://nearbypermits.com/boulder/permit/PMT2000-02252-MEC/) | | Jul 6, 2000 | Electrical | Internal remodel on first, second and third floor | $22,965 | [PMT2000-02252-ELE](https://nearbypermits.com/boulder/permit/PMT2000-02252-ELE/) | | Jul 6, 2000 | Alteration or repair | Internal remodel on first, second and third floor | $157,000 | [PMT2000-02252](https://nearbypermits.com/boulder/permit/PMT2000-02252/) | | May 17, 2000 | Demolition | Interior demo in bsmt, south east corner | Not listed | [PMT2000-02001-DEM](https://nearbypermits.com/boulder/permit/PMT2000-02001-DEM/) | | Mar 20, 2000 | Electrical | Install one telecommunication antenna on east side of existing penthouse plus related equipment. | $3,120 | [PMT2000-00985-ELE](https://nearbypermits.com/boulder/permit/PMT2000-00985-ELE/) | | Mar 5, 1999 | Electrical | Electrical | $15,000 | [PMT1999-01813-ELE](https://nearbypermits.com/boulder/permit/PMT1999-01813-ELE/) | | Feb 3, 1999 | Mechanical (HVAC) | Mechanical installing new ventilation ducts | $61,500 | [PMT1999-01038-MEC](https://nearbypermits.com/boulder/permit/PMT1999-01038-MEC/) | | Jan 29, 1999 | Mechanical (HVAC) | Mechanical install chilled water piping | $29,000 | [PMT1999-00889-MEC](https://nearbypermits.com/boulder/permit/PMT1999-00889-MEC/) | | Jan 29, 1999 | Plumbing | Plumbing install one floor drain | $1,900 | [PMT1999-00888-PLB](https://nearbypermits.com/boulder/permit/PMT1999-00888-PLB/) | | Aug 19, 1998 | Alteration or repair | Remodel and upgrade HVAC the original general permit number is 985486. | $207,035 | [PMT1998-05486](https://nearbypermits.com/boulder/permit/PMT1998-05486/) | | May 14, 1998 | Electrical | Electrical add 2 300 amp feeders | $38,259 | [PMT1998-03132-ELE](https://nearbypermits.com/boulder/permit/PMT1998-03132-ELE/) | | Jul 9, 1997 | Fire systems | Fire hook up fire alarm system | $2,000 | [PMT1997-04090-FIR](https://nearbypermits.com/boulder/permit/PMT1997-04090-FIR/) | | Mar 11, 1997 | Electrical | Electrical commercial service change | $474,462 | [PMT1997-01402-ELE](https://nearbypermits.com/boulder/permit/PMT1997-01402-ELE/) | | Mar 10, 1997 | Mechanical (HVAC) | Mechanical refrigeration system & ventilating equipment | $250,000 | [PMT1997-01342-MEC](https://nearbypermits.com/boulder/permit/PMT1997-01342-MEC/) | | Mar 10, 1997 | Plumbing | Plumbing reduced pressure backflow preventor | $3,431 | [PMT1997-01341-PLB](https://nearbypermits.com/boulder/permit/PMT1997-01341-PLB/) | | Mar 6, 1997 | Alteration or repair | Engine generator replacement the original general permit number is 971232. | $844,676 | [PMT1997-01232](https://nearbypermits.com/boulder/permit/PMT1997-01232/) | | Feb 7, 1996 | Electrical | Electrical power for access control | $1,200 | [PMT1996-00782-ELE](https://nearbypermits.com/boulder/permit/PMT1996-00782-ELE/) | | Nov 29, 1995 | Electrical | Electrical ELECTRICAL | $3,500 | [PMT1995-08867-ELE](https://nearbypermits.com/boulder/permit/PMT1995-08867-ELE/) | | Nov 28, 1995 | Alteration or repair | Mount equip cabinet & antenna panels on roof the original general permit numbe | $50,000 | [PMT1995-08807](https://nearbypermits.com/boulder/permit/PMT1995-08807/) | | Mar 4, 1994 | Fire systems | Fire fire alarm detection system | $150 | [PMT1994-01514-FIR](https://nearbypermits.com/boulder/permit/PMT1994-01514-FIR/) | | Oct 14, 1993 | Electrical | Electrical adding a circuit | $500 | [PMT1993-07714-ELE](https://nearbypermits.com/boulder/permit/PMT1993-07714-ELE/) | | Jan 20, 1993 | Mechanical (HVAC) | Mechanical replace refrigeration system and comfort cooling | $137,000 | [PMT1993-00328-MEC](https://nearbypermits.com/boulder/permit/PMT1993-00328-MEC/) | | Dec 5, 1990 | Alteration or repair | Interior rmdl. The original general permit number is r5118. | $130,000 | [PMT1990-R5118](https://nearbypermits.com/boulder/permit/PMT1990-R5118/) | | Aug 30, 1989 | Mechanical (HVAC) | Mechanical fire dampers & grilles | $1,200 | [PMT1989-P5114-MEC](https://nearbypermits.com/boulder/permit/PMT1989-P5114-MEC/) | | Aug 30, 1989 | Mechanical (HVAC) | Mechanical replace comfort cooling | $7,200 | [PMT1989-P5113-MEC](https://nearbypermits.com/boulder/permit/PMT1989-P5113-MEC/) | | Jul 12, 1989 | Electrical | Electrical remodel wiring | $1,500 | [PMT1989-P3878-ELE](https://nearbypermits.com/boulder/permit/PMT1989-P3878-ELE/) | | Jul 11, 1989 | Alteration or repair | Mech soundprf. The original general permit number is p3819. | $25,000 | [PMT1989-P3819](https://nearbypermits.com/boulder/permit/PMT1989-P3819/) | | Jul 11, 1989 | Alteration or repair | Adding walls. The original general permit number is p3750. | $5,000 | [PMT1989-P3750](https://nearbypermits.com/boulder/permit/PMT1989-P3750/) | | Jul 10, 1989 | Roofing | Roofing reroof - insul & sp5 | $140,730 | [PMT1989-P3815-RFG](https://nearbypermits.com/boulder/permit/PMT1989-P3815-RFG/) | | May 4, 1989 | Electrical | Electrical HVAC unit control | $1,000 | [PMT1989-P2352-ELE](https://nearbypermits.com/boulder/permit/PMT1989-P2352-ELE/) | | Apr 13, 1989 | Alteration or repair | Mech equip. The original general permit number is p1829. | $115,000 | [PMT1989-P1829](https://nearbypermits.com/boulder/permit/PMT1989-P1829/) | | Apr 7, 1989 | Plumbing | Plumbing remodel - one floor drain | $700 | [PMT1989-P1724-PLB](https://nearbypermits.com/boulder/permit/PMT1989-P1724-PLB/) | | Mar 9, 1989 | Electrical | Electrical SVC CHG | $92,000 | [PMT1989-P1102-ELE](https://nearbypermits.com/boulder/permit/PMT1989-P1102-ELE/) | | Feb 10, 1989 | Electrical | Electrical wire a/c & detectors | $30,000 | [PMT1989-P0624-ELE](https://nearbypermits.com/boulder/permit/PMT1989-P0624-ELE/) | | Oct 4, 1988 | Electrical | Electrical hookup work station | $4,000 | [PMT1988-N1402-ELE](https://nearbypermits.com/boulder/permit/PMT1988-N1402-ELE/) | | Oct 4, 1988 | Electrical | Electrical wire boiler controls | $4,000 | [PMT1988-N1401-ELE](https://nearbypermits.com/boulder/permit/PMT1988-N1401-ELE/) | | Sep 19, 1988 | Electrical | Electrical extend circuits | $2,400 | [PMT1988-N1186-ELE](https://nearbypermits.com/boulder/permit/PMT1988-N1186-ELE/) | | Sep 2, 1988 | Electrical | Electrical a/c unit in penthouse | $10,000 | [PMT1988-N0867-ELE](https://nearbypermits.com/boulder/permit/PMT1988-N0867-ELE/) | | Jul 25, 1988 | Alteration or repair | Remodel. The original general permit number is m9850. | $40,000 | [PMT1988-M9850](https://nearbypermits.com/boulder/permit/PMT1988-M9850/) | | Jul 18, 1988 | Electrical | Electrical REWIRE | $8,000 | [PMT1988-M9655-ELE](https://nearbypermits.com/boulder/permit/PMT1988-M9655-ELE/) | | Jul 6, 1988 | Mechanical (HVAC) | Mechanical hot water system | $60,000 | [PMT1988-M9266-MEC](https://nearbypermits.com/boulder/permit/PMT1988-M9266-MEC/) | | Apr 21, 1988 | Electrical | Electrical replace switch gear | $70,000 | [PMT1988-M7733-ELE](https://nearbypermits.com/boulder/permit/PMT1988-M7733-ELE/) | ## More on this street Other addresses on Walnut St with permits, nearest house number first: - [1603 Walnut St](https://nearbypermits.com/boulder/address/1603-walnut-st/): newest permit Jul 20, 2026 - [1470 Walnut St](https://nearbypermits.com/boulder/address/1470-walnut-st/): newest permit Mar 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 - [1655 Walnut St 301](https://nearbypermits.com/boulder/address/1655-walnut-st-301/): newest permit Jan 15, 2026 - [1401 Walnut St](https://nearbypermits.com/boulder/address/1401-walnut-st/): newest permit Aug 7, 2026 - [1707 Walnut St 106](https://nearbypermits.com/boulder/address/1707-walnut-st-106/): newest permit May 28, 2026 - [1708 Walnut St](https://nearbypermits.com/boulder/address/1708-walnut-st/): newest permit Feb 21, 2025 - [1375 Walnut St](https://nearbypermits.com/boulder/address/1375-walnut-st/): newest permit May 7, 2026 - [1726 Walnut St](https://nearbypermits.com/boulder/address/1726-walnut-st/): newest permit Oct 17, 2025 --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-07 02:24 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 60 permits at this address: https://nearbypermits.com/boulder/address/1545-walnut-st/