Data through September 2026 · updated 20 Oct 2026
846 building permits were issued in ZIP code 20851 by City of Rockville Inspection Services, October 2024 through September 2026: 15% of the 5,779 in Rockville, the 3rd busiest ZIP code. Plumbing permits lead with 264. 419 permits in the last 12 months (Oct 2025–Sep 2026), about the same as the 427 in the 12 months before. Permits from a city that runs its own permit office are not counted.
Share here is the part of the 846 permits in 20851; citywide is the same for all of Rockville.
| Kind of work | Permits | Share here | Citywide |
|---|---|---|---|
| Plumbing | 264 | 31% | 28% |
| Electrical | 167 | 20% | 16% |
| HVAC | 146 | 17% | 15% |
| Fences & walls | 79 | 9% | 5% |
| Solar | 76 | 9% | 5% |
| Garages, sheds & shade structures | 44 | 5% | 3% |
| Remodels & repairs | 22 | 3% | 2% |
| Additions | 15 | 2% | 1% |
| ADUs & casitas | 3 | under 1% | under 1% |
| Roofing | 3 | under 1% | under 1% |
| New homes | 2 | under 1% | 1% |
| Demolition | 2 | under 1% | under 1% |
| Pools & spas | 1 | under 1% | under 1% |
| Other | 22 | 3% | 22% |
Permits issued in each calendar year of the window.
| Year | Months | Permits | Per year |
|---|---|---|---|
| 2024 (from October) | 3 | 118 | 472 |
| 2025 | 12 | 424 | 424 |
| 2026 (through September) | 9 | 304 | 405 |
Permits issued Oct 2024–Sep 2025, at least 12 months before the file ends.
| Measure | 20851 | Citywide |
|---|---|---|
| Permits issued Oct 2024–Sep 2025 | 427 | 2,847 |
| Finished | 83.8% | 82.2% |
| Expired | 14.1% | 13.8% |
Source: City of Rockville MGO permit map layer (MGO_Permit_View, ArcGIS), read 20 Oct 2026. We count permits issued October 2024 through September 2026; denied and withdrawn permits are left out.
Building, trade, fence, sign and fire-protection permits the City of Rockville issues inside the city limits. Montgomery County's Department of Permitting Services covers the rest of the county, so a Rockville mailing address outside the city is not in this file. Plumbing and gas-service connections that WSSC Water permits are not in it either.
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, "Building permits in 20851, Rockville", https://contractorrecords.com/rockville/zip/20851, data through September 2026, from City of Rockville Inspection Services building-permit records.Link to a table: By kind of work · By year · How permits finish.
Download the tables (CSV): Permits in 20851 by kind of work · Permits in 20851 by year · Permits in 20851: finished and days to final.