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Building permits by ZIP code in the City of Thornton

Data through September 2026 · updated 20 Oct 2026

5 ZIP codes have 250 or more building permits in the City of Thornton, October 2024 through September 2026. 80602 is the busiest with 2,589 (33% of 7,766). Together they hold 96% of the permits.

ZIP codes by permits

Busiest first, October 2024 through September 2026. Top kind of work is the one with the most permits in that ZIP code.

ZIP codePermitsShareTop kind of work
806022,58933%New homes (708)
802411,74923%Plumbing (499)
802291,42018%Plumbing (455)
802331,23716%HVAC (323)
802604956%Plumbing (127)

4 more ZIP codes have fewer than 250 permits each (245 in all), so no page.

Download this table (CSV)

How these numbers are made

Source: City of Thornton Permits map service, layer Building Permits (2017-present), read 20 Oct 2026. We count permits issued October 2024 through September 2026; denied and withdrawn permits are left out.

Building and trade permits the City of Thornton issues inside the city limits, including the part of Thornton in Weld County, except re-roof, fence and backflow/irrigation permits, which the city's published file stops carrying after July 2025 and are left out of every month. Unincorporated Adams County, Northglenn, Westminster and Federal Heights issue their own permits and are not in this file. Right-of-way permits are left out.

  • The city's file names no contractor, so there are no contractor lists, rankings or firm pages for Thornton.
  • Re-roof, fence and backflow permits are not counted: the city's published file drops them after July 2025 (re-roofs went from hundreds a month to almost none), so counting the earlier ones would show a collapse that did not happen. Roofing is not covered on these pages for that reason.
  • The file has a status but no final date, so we can say how many permits finished but not how long they took.
  • Value is the valuation declared on the permit application, not the final cost of the job.
  • Status Closed counts as finished; Expired and Expired Closed count as expired.

Counts are permits, not jobs: one job can need several permits. Nobody paid to be on this page and nobody can. Sources and definitions →

Cite this page

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 the City of Thornton", https://contractorrecords.com/thornton/zip/, data through September 2026, from the City of Thornton Development Department building-permit records.

Link to a table: ZIP codes by permits.

Download the tables (CSV): ZIP codes by permits.

Common questions

  • Which ZIP code in Thornton has the most building permits?80602, with 2,589 permits, October 2024 through September 2026; then 80241 (1,749).
  • Can I see the permits for one address in Thornton?Not here: we publish permits by ZIP code without street addresses. The city keeps each property's permit history; search its records by address or permit number.
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