# Building permits at 2521 4th St, Boulder, CO

Five permits on record here. The newest, Jun 23, 2025: Proposing to add a Metal Trellis/Pergola over the upper level deck on Cottage R-7. 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 23, 2025 | Addition | Proposing to add a Metal Trellis/Pergola over the upper level deck on Cottage R-7. | $55,000 | [BLD-SFD2025-00067](https://nearbypermits.com/boulder/permit/BLD-SFD2025-00067/) |
| Jun 23, 2025 | Alteration or repair | Replacing previously permitted upper deck railing with Obscure glass panels | $20,000 | [BLD-SFD2025-00063](https://nearbypermits.com/boulder/permit/BLD-SFD2025-00063/) |
| Nov 16, 2023 | Fire systems | New NFPA 13D wet pipe monitored fire sprinkler system on the site of Mapleton Hill redevelopment with potential conversion to a residential board and care occupancy per 2012 NFPA 101 Chapter 32. System has a dedicated 1" fire main. The 1,151 square foot upper floor has a master bedroom, laundry and  | $14,704 | [FIR2023-00423](https://nearbypermits.com/boulder/permit/FIR2023-00423/) |
| Nov 2, 2023 | Fire systems | Install a new voluntary addressable fire alarm system to monitor an NFPA 13D sprinkler system in a single-family detached dwelling with potential conversion to a residential board and care occupancy per 2012 NFPA 101 Chapter 32. Provide full occupant notification throughout. Signals transmitted by p | $8,564 | [FIR2023-00430](https://nearbypermits.com/boulder/permit/FIR2023-00430/) |
| Dec 28, 2022 | New building | New construction of a two-bedroom two-story single family home with an attached single-car garage and finished basement. Unit Area: Basement 1,275SF, First Floor, 1,285SF excluding garage, Second Floor 1,167SF, Garage 240SF totaling 3,967SF (inclusive of garage). Additionally there are two patios, a | $574,531 | [BLD-SFD2022-00308](https://nearbypermits.com/boulder/permit/BLD-SFD2022-00308/) |

## More on this street

Other addresses on 4th St with permits, nearest house number first:

- [2525 4th St](https://nearbypermits.com/boulder/address/2525-4th-st/): newest permit Aug 28, 2026
- [2529 4th St](https://nearbypermits.com/boulder/address/2529-4th-st/): newest permit Jul 16, 2026
- [2543 4th St](https://nearbypermits.com/boulder/address/2543-4th-st/): newest permit Sep 3, 2025
- [2545 4th St](https://nearbypermits.com/boulder/address/2545-4th-st/): newest permit Aug 19, 2025
- [2436 4th St](https://nearbypermits.com/boulder/address/2436-4th-st/): newest permit Nov 3, 2025
- [2435 4th St](https://nearbypermits.com/boulder/address/2435-4th-st/): newest permit Aug 21, 2026
- [2431 4th St](https://nearbypermits.com/boulder/address/2431-4th-st/): newest permit Dec 16, 2024
- [2429 4th St](https://nearbypermits.com/boulder/address/2429-4th-st/): newest permit Dec 27, 2024
- [2427 4th St](https://nearbypermits.com/boulder/address/2427-4th-st/): newest permit Mar 7, 2025
- [2425 4th St](https://nearbypermits.com/boulder/address/2425-4th-st/): newest permit Mar 28, 2025

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Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-07 06:55 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

All 5 permits at this address: https://nearbypermits.com/boulder/address/2521-4th-st/