# Building permits at 429 Maxwell Ave, Boulder, CO 13 permits on record here. The newest, May 13: Residential Foundation Repair: - helical pier install x 6. 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 13, 2026 | Alteration or repair | Residential Foundation Repair: - helical pier install x 6 | $20,500 | [BLD-SFD2026-00251](https://nearbypermits.com/boulder/permit/BLD-SFD2026-00251/) | | Dec 23, 2020 | Plumbing | After the fact permit for a bathroom in a detached studio/garage building associated with a single family detached dwelling. Scope includes removal of a shower. | $300 | [PLB2020-00147](https://nearbypermits.com/boulder/permit/PLB2020-00147/) | | Dec 23, 2020 | Mechanical (HVAC) | After the fact permit for a bathroom in a detached studio/garage building associated with a single family detached dwelling. Scope includes removal of a shower. | $160 | [MEC2020-00339](https://nearbypermits.com/boulder/permit/MEC2020-00339/) | | Dec 23, 2020 | Electrical | After the fact permit for a bathroom in a detached studio/garage building associated with a single family detached dwelling. Scope includes removal of a shower. | $300 | [ELE2020-00286](https://nearbypermits.com/boulder/permit/ELE2020-00286/) | | Dec 23, 2020 | Alteration or repair | After the fact permit for a bathroom in a detached studio/garage building associated with a single family detached dwelling. Scope includes removal of a shower. Associated with interior remodel of the single family dwelling to establish an attached ADU (BLD-SFD2020-00091). See aur2020-00109. | $19,620 | [BLD-ACC2020-00031](https://nearbypermits.com/boulder/permit/BLD-ACC2020-00031/) | | Apr 8, 2020 | Plumbing | After the fact permit to establish a kitchen for an approved accessory dwelling unit (AUR2019-00109). Permit associated with the after the fact additon of a half bath to an existing permitted detached studio/garage (BLD-ACC2020-00031). | $205 | [PLB2020-00148](https://nearbypermits.com/boulder/permit/PLB2020-00148/) | | Apr 8, 2020 | Electrical | After the fact permit to establish a kitchen for an approved accessory dwelling unit (AUR2019-00109). Permit associated with the after the fact additon of a half bath to an existing permitted detached studio/garage (BLD-ACC2020-00031). | $625 | [ELE2020-00287](https://nearbypermits.com/boulder/permit/ELE2020-00287/) | | Apr 8, 2020 | Alteration or repair | After the fact permit to establish a kitchen for an approved accessory dwelling unit (AUR2019-00109). Permit associated with the after the fact addition of a half bath to an existing permitted detached studio/garage (BLD-ACC2020-00031). | $9,775 | [BLD-SFD2020-00091](https://nearbypermits.com/boulder/permit/BLD-SFD2020-00091/) | | Feb 1, 2019 | Mechanical (HVAC) | *Installation of a replacement 80k BTU, 96% efficient forced air furnace. Installation per manufacturer's specifications. This property is located within a designated historic district. Any changes to the exterior require historic review prior to permitting. No exterior changes proposed or approved | $3,000 | [MEC2019-00140](https://nearbypermits.com/boulder/permit/MEC2019-00140/) | | Jun 8, 2004 | Roofing | Re-roof including total tear-off and installation of asphalt shingles to match existing ("charcoal gray - per HIS2004-00099) on roof and over existing porch roof. | $7,500 | [PMT2004-02182-RFG](https://nearbypermits.com/boulder/permit/PMT2004-02182-RFG/) | | Oct 16, 2003 | Electrical | Construction of a new detached two-car one story garage and personal studio. | $5,500 | [PMT2003-02466-ELE](https://nearbypermits.com/boulder/permit/PMT2003-02466-ELE/) | | Oct 16, 2003 | New building | Construction of a new detached two-car one story garage and personal studio. | $55,000 | [PMT2003-02466](https://nearbypermits.com/boulder/permit/PMT2003-02466/) | | May 6, 1993 | Alteration or repair | Remove illegal dwelling unit/convert to single fam the original general permit | Not listed | [PMT1992-04553](https://nearbypermits.com/boulder/permit/PMT1992-04553/) | ## More on this street Other addresses on Maxwell Ave with permits, nearest house number first: - [430 Maxwell Ave](https://nearbypermits.com/boulder/address/430-maxwell-ave/): newest permit Apr 11, 2025 - [435 Maxwell Ave](https://nearbypermits.com/boulder/address/435-maxwell-ave/): newest permit Apr 23, 2025 - [415 Maxwell Ave](https://nearbypermits.com/boulder/address/415-maxwell-ave/): newest permit May 12, 2026 - [457 Maxwell Ave 2](https://nearbypermits.com/boulder/address/457-maxwell-ave-2/): newest permit Dec 9, 2025 - [510 Maxwell Ave](https://nearbypermits.com/boulder/address/510-maxwell-ave/): newest permit Jun 9, 2026 - [516 Maxwell Ave](https://nearbypermits.com/boulder/address/516-maxwell-ave/): newest permit Jun 11, 2026 - [527 Maxwell Ave](https://nearbypermits.com/boulder/address/527-maxwell-ave/): newest permit Apr 11, 2025 - [536 Maxwell Ave](https://nearbypermits.com/boulder/address/536-maxwell-ave/): newest permit Apr 17, 2025 - [541 Maxwell Ave](https://nearbypermits.com/boulder/address/541-maxwell-ave/): newest permit Apr 11, 2025 - [611 Maxwell Ave](https://nearbypermits.com/boulder/address/611-maxwell-ave/): newest permit Feb 18, 2026 --- Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-06 14:41 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ All 13 permits at this address: https://nearbypermits.com/boulder/address/429-maxwell-ave/