Data through September 2026 · updated 20 Oct 2026
1,867 plumbing permits were issued in the City of Thornton, October 2024 through September 2026: about 934 a year and 24% of all permits. 960 plumbing permits in the last 12 months (Oct 2025–Sep 2026), 6% more than the 907 in the 12 months before. The busiest month is March. 80241 has the most, 499.
What this file covers: Re-roof, fence and backflow permits are left out of every month: the city's published file stops carrying them after July 2025.
Permits issued each month, October 2024 through September 2026.
| Month | Permits |
|---|---|
| Oct 2024 | 81 |
| Nov 2024 | 68 |
| Dec 2024 | 80 |
| Jan 2025 | 71 |
| Feb 2025 | 63 |
| Mar 2025 | 85 |
| Apr 2025 | 78 |
| May 2025 | 73 |
| Jun 2025 | 84 |
| Jul 2025 | 78 |
| Aug 2025 | 80 |
| Sep 2025 | 66 |
| Oct 2025 | 84 |
| Nov 2025 | 66 |
| Dec 2025 | 89 |
| Jan 2026 | 89 |
| Feb 2026 | 55 |
| Mar 2026 | 100 |
| Apr 2026 | 68 |
| May 2026 | 78 |
| Jun 2026 | 80 |
| Jul 2026 | 93 |
| Aug 2026 | 70 |
| Sep 2026 | 88 |
By calendar month, 100 = an average month (the thin line). March is the busiest (119), February the quietest (76). A busy month at the permit counter usually means a longer wait for a contractor.
| Month | Index |
|---|---|
| January | 103 |
| February | 76 |
| March | 119 |
| April | 94 |
| May | 97 |
| June | 105 |
| July | 110 |
| August | 96 |
| September | 99 |
| October | 106 |
| November | 86 |
| December | 109 |
Permits issued Oct 2024–Sep 2025, at least 12 months before the file ends.
| Measure | Value |
|---|---|
| Permits issued Oct 2024–Sep 2025 | 907 |
| Finished | 77.6% |
| Expired | 21.9% |
The value written on the permit at application, from 1,864 permits with one. Not a quote and not the final bill.
| Measure | Value |
|---|---|
| Usual declared value | $3,450 |
| Middle half | $2,360–$5,000 |
Counted at the property's ZIP code. Share is the part of the city's 1,867 plumbing permits.
How the city filed these permits. We group its types into kinds of work; this is the split.
| Permit type | Permits | Share |
|---|---|---|
| Plumbing - Water Heater | 1,208 | 65% |
| Plumbing - Sewer Repair | 386 | 21% |
| Plumbing - Water Pipe New/Alteration | 68 | 4% |
| Plumbing - Water Heater Tankless | 50 | 3% |
| Mechanical - Gas Piping | 47 | 3% |
| Plumbing - Water Softner System | 32 | 2% |
| Plumbing - New Irrigation Meter/Backflow | 25 | 1% |
| Plumbing - Plumbing System New/Alteration | 23 | 1% |
| Plumbing - Drain Vent/Pipe | 9 | under 1% |
| Plumbing - Water Connection | 6 | under 1% |
HVAC (1,726)Remodels & repairs (1,261)Electrical (840)New homes (738)Garages, sheds & shade structures (285)
From our cross-city data studies: the same measure, read the same way, for every city we cover.
Plumbing permits for other places in Denver and Boulder. Each permit office keeps its own file, so the numbers are not added together.
Denver, COBoulder, COBoulder County, COAdams County, COAurora, COCentennial, COLongmont, CO
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.
Counts are permits, not jobs: one job can need several permits. Nobody paid to be on this page and nobody can. Sources and definitions →
Free to reuse with attribution (CC BY 4.0). Please credit Contractor Records and link to this page. Suggested citation:
Contractor Records, "Plumbing permits in the City of Thornton, CO", https://contractorrecords.com/thornton/plumbing-permits, data through September 2026, from the City of Thornton Development Department building-permit records.Link to a table: By month · Season · How many get finished · Declared value · By ZIP code · Permit types.
Download the tables (CSV): Plumbing permits by month · Plumbing permits by calendar month (index) · Plumbing permits: finished share · Plumbing permits: declared value · Plumbing permits by ZIP code · Plumbing permits by permit type.