Data through April 2026 · updated 20 Oct 2026
8 ZIP codes with 200 or more permits on homes in unincorporated Boulder County, May 2023 through April 2026. 80301 is the busiest with 1,903 permits (25% of the 7,668 in Boulder County). Each permit is counted at its property's ZIP code, for the 10 kinds of home work we track.
Busiest first. Top trade is the trade with the most permits in that ZIP code; contractors are distinct business names with at least one permit there. A ZIP code opens its page: permits by trade, the most active firms and usual filed values.
| ZIP code | Permits | Share | Top trade | Contractors |
|---|---|---|---|---|
| 80301 | 1,903 | 25% | Heating & Cooling (591) | 521 |
| 80503 | 1,866 | 24% | Heating & Cooling (459) | 500 |
| 80302 | 1,096 | 14% | Heating & Cooling (262) | 358 |
| 80303 | 790 | 10% | Heating & Cooling (190) | 275 |
| 80504 | 331 | 4% | Roofing (96) | 172 |
| 80304 | 320 | 4% | Heating & Cooling (86) | 156 |
| 80466 | 315 | 4% | Solar & Battery (63) | 134 |
| 80026 | 243 | 3% | Roofing (62) | 151 |
Fewer than 200 permits, so no page: 80540 (158), 80403 (128), 80481 (82), 80510 (81), 80305 (67), 80455 (53), 80544 (31), 80501 (22), 80020 (21), 80027 (20), 80516 (19), 80025 (5), 80422 (4), 80513 (3).
Source: Boulder County Community Planning & Permitting building permits on homes in unincorporated Boulder County (the County's Accela permit layer, which stopped taking new applications on May 4, 2026, so the data ends with April 2026; the City of Boulder and the other cities issue their own permits), with issue dates and declared job values from the Boulder County Assessor's permit file. The window is May 2023 through April 2026.
Counted: permits on homes for the kinds of work we track (heating & cooling, roofing, solar & battery, windows & doors, electrical, plumbing & water heater, remodel & repair, generator, addition, siding) where the record names a contractor, placed by the ZIP code of the permit's address (or its parcel's). The pages with a ZIP code cover 6,864 of the 7,668 permits; 110 had no usable ZIP code.
Not counted: commercial work, trades we don't read, and owner-pulled permits. A ZIP code does not follow city or county lines; these count only permits in unincorporated Boulder County.
Free to reuse with attribution (CC BY 4.0). Please credit Contractor Records and link to this page. Suggested citation:
Contractor Records, "Building permits by ZIP code in Boulder County (unincorporated)", https://contractorrecords.com/boulder-county/zip/, data through April 2026, from Boulder County building-permit records.Link to a table: ZIP codes by permits.
Download the tables (CSV): ZIP codes by permits.