Montgomery County building & ADU permits
Recent permit activity, updated continuously.
Montgomery County is Maryland's largest jurisdiction and a close-in Washington DC suburb, spanning Bethesda, Silver Spring, Rockville, Takoma Park and Gaithersburg. The county has allowed accessory dwelling units county-wide since its 2019 zoning amendment, and its Department of Permitting Services publishes residential building permits as public-domain open data, which Igni ingests with per-row city, ZIP and coordinates.
Igni is tracking 200 residential and building permits in Montgomery County, MD — including 1 classified accessory-dwelling-unit (ADU) filing. The most active ZIP is 20817. The most recent filing Igni tracked was Aug 14, 2026. All records come from data.montgomerycountymd.gov (Socrata), an official government open-data feed, and are refreshed continuously.
200
Permits tracked
1
ADU permits
33
Distinct ZIP codes
Aug 14, 2026
Newest permit
Recent permits
A sample of the freshest permits in this jurisdiction — ZIP and city only (no street addresses).
| ZIP | Permit type | ADU type | Valuation | Applied |
|---|---|---|---|---|
| 20854 | Residential | — | $259,000 | Jul 2, 2026 |
| 20876 | Residential | — | $499 | Jul 30, 2026 |
| 20910 | Residential | — | $4,000 | Apr 29, 2026 |
| 20850 | Residential | — | $1,500,000 | Jan 6, 2026 |
| 20878 | Residential | — | $56,000 | Jul 31, 2026 |
| 20912 | Residential | — | $15,000 | Jul 2, 2026 |
| 20817 | Residential | — | $7,000 | Jul 27, 2026 |
| 20866 | Residential | — | $38,000 | Aug 6, 2026 |
| 20877 | Residential | — | $13,000 | Aug 6, 2026 |
| 20912 | Residential | — | $74,000 | Jul 13, 2026 |
| 20815 | Residential | — | $25,000 | Jul 7, 2026 |
| 20906 | Residential | — | $200,000 | Aug 4, 2026 |
| 20910 | Residential | — | $23,000 | Jul 21, 2026 |
| 20906 | Residential | — | $8,750 | Aug 3, 2026 |
| 20855 | Residential | — | $2,000 | Aug 5, 2026 |
| 20817 | Residential | — | $385,000 | May 1, 2026 |
| 20910 | Residential | — | $30,000 | Jun 3, 2026 |
| 20854 | Residential | — | $0 | Jun 16, 2026 |
| 20852 | Residential | — | $5,700 | Jun 9, 2026 |
| 20902 | Residential | — | $85,000 | Jul 14, 2026 |
Top ZIP codes by recent activity
ADU types in the recent set
Housing law — Maryland
Accessory dwelling units in Maryland are regulated locally; there is no statewide ADU mandate, so rules vary by city and county.
Maryland has no statewide upzoning law; residential density is set by local zoning, with several counties pursuing their own reforms.
Data source
Sourced from data.montgomerycountymd.gov (Socrata). Public domain.
Nearby cities — Maryland
Learn more about ADUs & building permits
Background reading on accessory dwelling units, building permits, and how Igni turns Montgomery County permit records into leads.
Montgomery County permit data — FAQ
Where does Igni get Montgomery County permit data?
How fresh is Montgomery County permit data?
Does Montgomery County allow accessory dwelling units (ADUs)?
Get permit leads — Montgomery County
Fresh, filterable residential and ADU permit leads from Montgomery County — delivered before your competitors even know.
Informational only, not legal advice. Headline counts reflect all permits Igni has tracked for this jurisdiction; the table shows recent activity. Housing law changes — verify current statutes before relying on this.