# Building permits at 421 Baseline Rd, Boulder, CO

Five permits on record here. The newest, Dec 22, 2025: Remove & replace (3) windows for a single family detached dwelling - no alteratons to framed openings. 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 22, 2025 | Alteration or repair | Remove & replace (3) windows for a single family detached dwelling - no alteratons to framed openings | $3,219 | [BLD-SFD2025-00562](https://nearbypermits.com/boulder/permit/BLD-SFD2025-00562/) |
| Jan 15, 2019 | Mechanical (HVAC) | Replace existing 80% efficiency furnace with new 80% efficient Armstrong, 135000 BTU furnace. | $3,286 | [MEC2019-00043](https://nearbypermits.com/boulder/permit/MEC2019-00043/) |
| Mar 9, 2000 | Roofing | Repair attached carport roof. tear off shake roof, 30lb felt, dimentional shingle. 5/12 pitch. | $7,687 | [PMT2000-00933-RFG](https://nearbypermits.com/boulder/permit/PMT2000-00933-RFG/) |
| May 23, 1996 | Alteration or repair | Replace balcony the original general permit number is 963371. | $3,000 | [PMT1996-03371](https://nearbypermits.com/boulder/permit/PMT1996-03371/) |
| Feb 22, 1990 | Mechanical (HVAC) | Mechanical GAS LOGS | $500 | [PMT1990-P8570-MEC](https://nearbypermits.com/boulder/permit/PMT1990-P8570-MEC/) |

## More on this street

Other addresses on Baseline Rd with permits, nearest house number first:

- [595 Baseline Rd](https://nearbypermits.com/boulder/address/595-baseline-rd/): newest permit Nov 13, 2024
- [601 Baseline Rd](https://nearbypermits.com/boulder/address/601-baseline-rd/): newest permit Mar 4, 2026
- [709 Baseline Rd](https://nearbypermits.com/boulder/address/709-baseline-rd/): newest permit Apr 9, 2025
- [900 Baseline Rd](https://nearbypermits.com/boulder/address/900-baseline-rd/): newest permit Aug 18, 2026
- [909 Baseline Rd](https://nearbypermits.com/boulder/address/909-baseline-rd/): newest permit Jul 20, 2026
- [913 Baseline Rd](https://nearbypermits.com/boulder/address/913-baseline-rd/): newest permit Aug 31, 2026
- [1403 Baseline Rd](https://nearbypermits.com/boulder/address/1403-baseline-rd/): newest permit Sep 22, 2026
- [1515 Baseline Rd](https://nearbypermits.com/boulder/address/1515-baseline-rd/): newest permit Jan 3, 2025
- [1520 Baseline Rd](https://nearbypermits.com/boulder/address/1520-baseline-rd/): newest permit Jan 7, 2026
- [1737 Baseline Rd](https://nearbypermits.com/boulder/address/1737-baseline-rd/): newest permit Nov 19, 2024

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Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-06 17:42 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/421-baseline-rd/