# Building permits at 3990 Darley Ave, Boulder, CO 12 permits on record here. The newest, Sep 18: Installing Mitsubishi 2 zone 20k (2 wall mounted units) and Mitsubishi 2 zone 30K. 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 | |---|---|---|---|---| | Sep 18, 2026 | Mechanical (HVAC) | Installing Mitsubishi 2 zone 20k (2 wall mounted units) and Mitsubishi 2 zone 30K (1 4 way ceiling cassette, 1 wall mount) 1-MXZ-2D20NLHZ 20K BTU 19.3 SEER2 Heat Pump 1-MXZ-3D30NLHZ 30K BTU 20 SEER2 Heat Pump 2-MSZ-GX12NL Wall Mounts 1-MSZ-GX09NL Wall Mount 1-SLZ-AF18NL Ceiling Cassette 1-Level 1 El | $44,529 | [MEC2026-01689](https://nearbypermits.com/boulder/permit/MEC2026-01689/) | | Mar 17, 2026 | Roofing | All Structures must be permitted separately Total tear-off & reroof of SFD, 27 squares of dimensional shingles on a pitch represented as 4/12. All roof materials shall be installed per manufacturer?s specs. Mid-roof inspection is required if 1) pitch is less than 4/12 or 2) for any roof type other t | $8,910 | [RFG2026-00226](https://nearbypermits.com/boulder/permit/RFG2026-00226/) | | Sep 27, 2019 | Mechanical (HVAC) | *install replacement 80% 90k btu furnace | $4,392 | [MEC2019-01614](https://nearbypermits.com/boulder/permit/MEC2019-01614/) | | Jan 21, 2014 | Plumbing | Interior remodel of basement and main level. Structural work includes reconfiguration of existing stairs, addition of four skylights, alteration of three lower level windows to meet egress requirements, and dropped beams in basement at bearing wall. Scope includes addition of bathroom in basement, r | $3,800 | [PMT2013-06745-PLB](https://nearbypermits.com/boulder/permit/PMT2013-06745-PLB/) | | Jan 21, 2014 | Electrical | Interior remodel of basement and main level. Structural work includes reconfiguration of existing stairs, addition of four skylights, alteration of three lower level windows to meet egress requirements, and dropped beams in basement at bearing wall. Scope includes addition of bathroom in basement, r | $2,400 | [PMT2013-06745-ELE](https://nearbypermits.com/boulder/permit/PMT2013-06745-ELE/) | | Jan 21, 2014 | Alteration or repair | Interior remodel of basement and main level. Structural work includes reconfiguration of existing stairs, addition of four skylights, alteration of three lower level windows to meet egress requirements, and dropped beams in basement at bearing wall. Scope includes addition of bathroom in basement, r | $75,000 | [PMT2013-06745](https://nearbypermits.com/boulder/permit/PMT2013-06745/) | | Jun 29, 2011 | Mechanical (HVAC) | Installation of a new a/c unit -- includes associated electrical. Must comply with BRC 5-9-3 Exceeding Decibel Sound Levels Prohibited | $2,500 | [PMT2011-02722-MEC](https://nearbypermits.com/boulder/permit/PMT2011-02722-MEC/) | | Jun 29, 2011 | Electrical | Installation of a new a/c unit -- includes associated electrical. Must comply with BRC 5-9-3 Exceeding Decibel Sound Levels Prohibited | $300 | [PMT2011-02722-ELE](https://nearbypermits.com/boulder/permit/PMT2011-02722-ELE/) | | Jun 12, 2008 | Fence, wall or deck | Installation of 202 linear fet of 6' high cedar privacy fencning. along portions of the side yards (with returns to the SFD) and the entire back lot line. | $4,000 | [PMT2008-02397-FEN](https://nearbypermits.com/boulder/permit/PMT2008-02397-FEN/) | | Oct 9, 2001 | Roofing | Tear off and install 25 tr dimensionals | $2,000 | [PMT2001-04471-RFG](https://nearbypermits.com/boulder/permit/PMT2001-04471-RFG/) | | Sep 27, 2001 | Mechanical (HVAC) | Installing a forced air furnace. | $1,386 | [PMT2001-04303-MEC](https://nearbypermits.com/boulder/permit/PMT2001-04303-MEC/) | | Feb 28, 2001 | Mechanical (HVAC) | Replace water heater. | $555 | [PMT2001-00574-MEC](https://nearbypermits.com/boulder/permit/PMT2001-00574-MEC/) | ## More on this street Other addresses on Darley Ave with permits, nearest house number first: - [3935 Darley Ave](https://nearbypermits.com/boulder/address/3935-darley-ave/): newest permit Nov 26, 2025 - [3930 Darley Ave](https://nearbypermits.com/boulder/address/3930-darley-ave/): newest permit Jul 21, 2026 - [4060 Darley Ave](https://nearbypermits.com/boulder/address/4060-darley-ave/): newest permit May 22, 2025 - [4065 Darley Ave](https://nearbypermits.com/boulder/address/4065-darley-ave/): newest permit Feb 18, 2025 - [3890 Darley Ave](https://nearbypermits.com/boulder/address/3890-darley-ave/): newest permit Aug 3, 2026 - [4095 Darley Ave](https://nearbypermits.com/boulder/address/4095-darley-ave/): newest permit May 20, 2026 - [3865 Darley Ave](https://nearbypermits.com/boulder/address/3865-darley-ave/): newest permit Nov 13, 2025 - [4250 Darley Ave](https://nearbypermits.com/boulder/address/4250-darley-ave/): newest permit Aug 5, 2025 - [3710 Darley Ave](https://nearbypermits.com/boulder/address/3710-darley-ave/): newest permit Jun 15, 2026 - [3705 Darley Ave](https://nearbypermits.com/boulder/address/3705-darley-ave/): newest permit Aug 25, 2026 --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-08 03:00 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 12 permits at this address: https://nearbypermits.com/boulder/address/3990-darley-ave/