# Building permits at 3750 Walnut St, Boulder, CO 20 permits on record here. The newest, Dec 20, 2024: We will install a cell communicator and connect it to the existing FACU for communications. 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 20, 2024 | Fire systems | We will install a cell communicator and connect it to the existing FACU for communications. (FAR) | $1,395 | [FIR2024-00495](https://nearbypermits.com/boulder/permit/FIR2024-00495/) | | Jun 4, 2024 | Electrical | service upgrade | $6,000 | [ELE2024-00364](https://nearbypermits.com/boulder/permit/ELE2024-00364/) | | Oct 2, 2023 | Fire systems | Replace the fire alarm control unit, upgrade the annunciator & replace the board only for the existing power supply. No general building permit associated with this permit. General air (fapr) | $6,718 | [FIR2023-00377](https://nearbypermits.com/boulder/permit/FIR2023-00377/) | | Mar 9, 2006 | Fire systems | Fire Alarm System - General Air | $9,600 | [PMT2006-00695-FIR](https://nearbypermits.com/boulder/permit/PMT2006-00695-FIR/) | | May 12, 2005 | Alteration or repair | Remodel of existing building for existing user, General Air Service, to remove interior partion walls and install 2 overhead doors for use as storage. | $8,000 | [PMT2005-01437](https://nearbypermits.com/boulder/permit/PMT2005-01437/) | | Nov 5, 2003 | Alteration or repair | Installation of two new windows per engineer's specifications; synthetic stucco application on east and north walls. | $10,000 | [PMT2003-04007](https://nearbypermits.com/boulder/permit/PMT2003-04007/) | | Oct 18, 1996 | Electrical | Electrical site lighting at 3850 walnut street | $18,000 | [PMT1996-06915-ELE](https://nearbypermits.com/boulder/permit/PMT1996-06915-ELE/) | | Oct 1, 1996 | Grading | Grading parking lot improvments at 3850 walnut street. The original general permit number is 966431. | Not listed | [PMT1996-06431-GRA](https://nearbypermits.com/boulder/permit/PMT1996-06431-GRA/) | | Oct 1, 1996 | Alteration or repair | Grading parking lot improvments at 3850 walnut street. The original general permit number is 966431. | $78,617 | [PMT1996-06431](https://nearbypermits.com/boulder/permit/PMT1996-06431/) | | Dec 28, 1995 | Fire systems | Fire fire sprinkler system at 1990 38th street unit 201 | $275 | [PMT1995-09504-FIR](https://nearbypermits.com/boulder/permit/PMT1995-09504-FIR/) | | Jul 28, 1995 | Plumbing | Plumbing add uninal and water closet at 3850 walnut street | $1,399 | [PMT1995-05722-PLB](https://nearbypermits.com/boulder/permit/PMT1995-05722-PLB/) | | Jul 13, 1995 | Alteration or repair | Remodel of mens restroom at 3850 walnut street. The original general permit number is 955239. | $5,000 | [PMT1995-05239](https://nearbypermits.com/boulder/permit/PMT1995-05239/) | | Apr 12, 1995 | Mechanical (HVAC) | Mechanical install evaporative cooler located roof top at 3850 walnut street | $4,500 | [PMT1995-02730-MEC](https://nearbypermits.com/boulder/permit/PMT1995-02730-MEC/) | | Mar 14, 1995 | Electrical | Electrical electrical wiring for tenant remodel at 3850 walnut street | $7,500 | [PMT1995-01879-ELE](https://nearbypermits.com/boulder/permit/PMT1995-01879-ELE/) | | Mar 6, 1995 | Plumbing | Plumbing plumbing at 3850 walnut street | $5,900 | [PMT1995-01650-PLB](https://nearbypermits.com/boulder/permit/PMT1995-01650-PLB/) | | Mar 3, 1995 | Alteration or repair | Tenant remodel (enlarge restrooms and move walls) at 3850 walnut street | $90,000 | [PMT1995-01572](https://nearbypermits.com/boulder/permit/PMT1995-01572/) | | Mar 7, 1994 | New building | Install horizontal propane tank the original general permit number is 940191. | $2,000 | [PMT1994-00191](https://nearbypermits.com/boulder/permit/PMT1994-00191/) | | Dec 20, 1993 | Addition | Addition to south side of existing structure the original general permit numbe | Not listed | [PMT1993-09277-FLD](https://nearbypermits.com/boulder/permit/PMT1993-09277-FLD/) | | Dec 20, 1993 | Alteration or repair | Addition to south side of existing structure the original general permit numbe | $15,000 | [PMT1993-09277](https://nearbypermits.com/boulder/permit/PMT1993-09277/) | | Feb 14, 1989 | Fire systems | Fire fire sprinkler system at 3800 walnut st | Not listed | [PMT1989-P0645-FIR](https://nearbypermits.com/boulder/permit/PMT1989-P0645-FIR/) | ## More on this street Other addresses on Walnut St with permits, nearest house number first: - [3720 Walnut St](https://nearbypermits.com/boulder/address/3720-walnut-st/): newest permit Sep 15, 2026 - [3333 Walnut St](https://nearbypermits.com/boulder/address/3333-walnut-st/): newest permit Nov 17, 2025 - [3300 Walnut St](https://nearbypermits.com/boulder/address/3300-walnut-st/): newest permit Jun 2, 2025 - [3250 Walnut St](https://nearbypermits.com/boulder/address/3250-walnut-st/): newest permit May 16, 2025 - [3201 Walnut St](https://nearbypermits.com/boulder/address/3201-walnut-st/): newest permit Nov 18, 2025 - [3151 Walnut St](https://nearbypermits.com/boulder/address/3151-walnut-st/): newest permit Nov 8, 2024 - [3003 Walnut St](https://nearbypermits.com/boulder/address/3003-walnut-st/): newest permit Jul 31, 2025 - [4730 Walnut St](https://nearbypermits.com/boulder/address/4730-walnut-st/): newest permit May 21, 2026 - [4745 Walnut St](https://nearbypermits.com/boulder/address/4745-walnut-st/): newest permit Aug 11, 2025 - [4760 Walnut St](https://nearbypermits.com/boulder/address/4760-walnut-st/): newest permit Nov 19, 2024 --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-06 15:20 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 20 permits at this address: https://nearbypermits.com/boulder/address/3750-walnut-st/