Loudoun County building & ADU permits
Recent permit activity, updated continuously.
Loudoun County lies in Northern Virginia on the western edge of the Washington, DC metro area and takes in Ashburn, Sterling and the county seat, Leesburg. Its permit export names accessory-dwelling work (new construction or conversion) as its own work class, which Igni reads directly to flag ADUs. Records carry no ZIP, so Igni geocodes each street address.
Igni is tracking 838 residential and building permits in Loudoun County, VA — including 9 classified accessory-dwelling-unit (ADU) filings. The most active ZIP is 20175. The most recent filing Igni tracked was Nov 10, 2026. All records come from Loudoun County LandMARC permits (ArcGIS), an official government open-data feed, and are refreshed continuously.
838
Permits tracked
9
ADU permits
15
Distinct ZIP codes
Nov 10, 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 |
|---|---|---|---|---|
| 20147 | Commercial | — | $0 | Sep 14, 2026 |
| 20132 | Residential | — | $15,000 | Sep 18, 2026 |
| 20152 | Residential | — | $16,000 | Oct 14, 2026 |
| 20147 | Residential | — | $0 | Aug 7, 2026 |
| 20132 | Residential | — | $57,196 | Aug 25, 2026 |
| 20164 | Residential | — | $30,000 | Sep 23, 2026 |
| 20175 | Residential | — | $0 | Oct 13, 2026 |
| 20176 | Residential | — | $13,000 | Oct 14, 2026 |
| 20152 | Residential | — | $0 | Sep 25, 2026 |
| 20147 | Residential | — | $3,696 | Oct 12, 2026 |
| 20132 | Residential | — | $44,717 | Sep 29, 2026 |
| 20176 | Commercial | — | $4,500 | Oct 2, 2026 |
| 20105 | Residential | — | $0 | Oct 13, 2026 |
| 20105 | Residential | — | $7,250 | Sep 29, 2026 |
| 20176 | Residential | — | $31,482 | Oct 9, 2026 |
| 20152 | Residential | — | $0 | Oct 9, 2026 |
| 20176 | Commercial | — | $200,000 | Sep 30, 2026 |
| 20132 | Residential | — | $67,000 | Oct 23, 2026 |
| 20164 | Residential | — | $0 | Aug 3, 2026 |
| 20152 | Commercial | — | $0 | Sep 20, 2026 |
Top ZIP codes by recent activity
ADU types in the recent set
Permit activity in Loudoun County
Igni counted 5,337 permits issued in Loudoun County over the last 12 months (Nov 2025 – Oct 2026).
The source's volume stepped up around April 2026 (×3.8) — likely a change in what the city publishes, so we don't compare year over year across it.
Not enough history for a seasonal forecast yet. How we forecast
| Permit type | Last 12 months | Year over year |
|---|---|---|
| All permits | 5,337 | —* |
| Residential building | 2,770 | —* |
| Commercial building | 2,567 | —* |
| Trade (electrical, plumbing, mechanical) | 0 | —* |
| ADU | 130 | —* |
* No year-over-year figure: the source's volume for this permit type stepped up within the last two years — likely a change in what the city publishes — so the two 12-month windows are not comparable.
Monthly figures
| Month | Permits | 10th–90th percentile |
|---|---|---|
| Nov 2023 | 203 | — |
| Dec 2023 | 75 | — |
| Jan 2024 | 116 | — |
| Feb 2024 | 128 | — |
| Mar 2024 | 164 | — |
| Apr 2024 | 101 | — |
| May 2024 | 145 | — |
| Jun 2024 | 88 | — |
| Jul 2024 | 167 | — |
| Aug 2024 | 160 | — |
| Sep 2024 | 127 | — |
| Oct 2024 | 142 | — |
| Nov 2024 | 99 | — |
| Dec 2024 | 140 | — |
| Jan 2025 | 131 | — |
| Feb 2025 | 191 | — |
| Mar 2025 | 152 | — |
| Apr 2025 | 141 | — |
| May 2025 | 228 | — |
| Jun 2025 | 130 | — |
| Jul 2025 | 162 | — |
| Aug 2025 | 117 | — |
| Sep 2025 | 144 | — |
| Oct 2025 | 196 | — |
| Nov 2025 | 238 | — |
| Dec 2025 | 142 | — |
| Jan 2026 | 167 | — |
| Feb 2026 | 206 | — |
| Mar 2026 | 270 | — |
| Apr 2026 | 329 | — |
| May 2026 | 735 | — |
| Jun 2026 | 664 | — |
| Jul 2026 | 548 | — |
| Aug 2026 | 847 | — |
| Sep 2026 | 574 | — |
| Oct 2026 | 617 | — |
Counts are permits issued per calendar month as Loudoun County publishes them to its open-data feed — not a complete census; a change in what the city publishes moves them too. The current month is left out, and the most recent months are provisional. A forecast is a statistical estimate with a range, not a prediction for any project. Informational only.
How long do permits take in Loudoun County?
Based on 7,742 Loudoun County permits applied for between Nov 2023 and Aug 2026, the typical (median) permit was issued 55 days after application, and the middle half of permits took 25–134 days. One in ten took longer than 228 days.
| Permit type | Median | Typical range | Permits |
|---|---|---|---|
| All permits | 55 days | 25–134 days | 7,742 |
| Residential building | 34 days | 15–64 days | 4,293 |
| Commercial building | 131 days | 52–220 days | 3,449 |
| ADU | 84 days | 54–123 days | 80 |
Typical, not guaranteed: individual permits vary with project scope, application completeness and plan-review workload. Days are calendar days from application to issuance; applications still pending are counted as not-yet-issued rather than dropped. Informational only, not legal advice. How we calculate approval times.
Housing law — Virginia
Accessory dwelling units in Virginia are handled locally; without a statewide ADU mandate, rules differ by city and county.
Virginia has no statewide upzoning law; residential density is set by local zoning, with several Northern Virginia jurisdictions pursuing reform.
Data source
Sourced from Loudoun County LandMARC permits (ArcGIS). Public records (Virginia FOIA).
Nearby cities — Virginia
Learn more about ADUs & building permits
Background reading on accessory dwelling units, building permits, and how Igni turns Loudoun County permit records into leads.
Loudoun County permit data — FAQ
Where does Igni get Loudoun County permit data?
How fresh is Loudoun County permit data?
How long does it take to get a building permit in Loudoun County?
Does Loudoun County allow accessory dwelling units (ADUs)?
Get permit leads — Loudoun County
Fresh, filterable residential and ADU permit leads from Loudoun 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.