San Bruno building & ADU permits
Recent permit activity, updated continuously.
San Bruno is a San Mateo County city on the Peninsula, just west of San Francisco International Airport. The city classifies accessory dwelling units and junior ADUs as their own work types, and its permits carry each project's own description of the work.
Igni is tracking 199 residential and building permits in San Bruno, CA — including 3 classified accessory-dwelling-unit (ADU) filings. The most active ZIP is 94066. The most recent filing Igni tracked was Sep 25, 2026. All records come from City of San Bruno (MyGovernmentOnline / ArcGIS), an official government open-data feed, and are refreshed continuously.
199
Permits tracked
3
ADU permits
1
Distinct ZIP codes
Sep 25, 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 |
|---|---|---|---|---|
| 94066 | Residential | — | — | Aug 18, 2026 |
| 94066 | Residential | — | — | Aug 18, 2026 |
| 94066 | Other | — | — | Aug 18, 2026 |
| 94066 | Residential | — | — | Aug 18, 2026 |
| 94066 | Commercial | — | — | Aug 19, 2026 |
| 94066 | Residential | — | — | Aug 19, 2026 |
| 94066 | Residential | — | — | Aug 19, 2026 |
| 94066 | Residential | — | — | Aug 19, 2026 |
| 94066 | Residential | — | — | Aug 19, 2026 |
| 94066 | Other | — | — | Aug 19, 2026 |
| 94066 | Residential | — | — | Aug 19, 2026 |
| 94066 | Residential | — | — | Aug 19, 2026 |
| 94066 | Other | — | — | Aug 20, 2026 |
| 94066 | Residential | — | — | Aug 20, 2026 |
| 94066 | Other | — | — | Aug 20, 2026 |
| 94066 | Residential | — | — | Aug 20, 2026 |
| 94066 | Residential | — | — | Aug 20, 2026 |
| 94066 | Residential | — | — | Aug 20, 2026 |
| 94066 | Other | — | — | Aug 20, 2026 |
| 94066 | Residential | — | — | Aug 20, 2026 |
Top ZIP codes by recent activity
ADU types in the recent set
Permit activity in San Bruno
Igni counted 1,682 permits issued in San Bruno over the last 12 months (Sep 2025 – Aug 2026) — up 14.6% on the 1,468 in the 12 months before. The forecast expects about 840 over the next 6 months.
The source's volume stepped up around August 2024 (×2.3) — likely a change in what the city publishes, so we don't compare year over year across it.
Forecast: trailing mean, typical error ±16% in backtests one to six months ahead. How we forecast
| Permit type | Last 12 months | Year over year | Forecast, next 6 months |
|---|---|---|---|
| All permits | 1,682 | Up 14.6% | ≈ 840 |
| Residential building | 667 | Up 13.1% | ≈ 336 |
| Commercial building | 124 | —* | ≈ 60 |
| Trade (electrical, plumbing, mechanical) | 891 | Up 7.3% | ≈ 444 |
| ADU | 48 | —* | — |
* 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 |
|---|---|---|
| Sep 2023 | 55 | — |
| Oct 2023 | 54 | — |
| Nov 2023 | 41 | — |
| Dec 2023 | 32 | — |
| Jan 2024 | 39 | — |
| Feb 2024 | 42 | — |
| Mar 2024 | 57 | — |
| Apr 2024 | 51 | — |
| May 2024 | 92 | — |
| Jun 2024 | 94 | — |
| Jul 2024 | 95 | — |
| Aug 2024 | 103 | — |
| Sep 2024 | 112 | — |
| Oct 2024 | 153 | — |
| Nov 2024 | 97 | — |
| Dec 2024 | 80 | — |
| Jan 2025 | 121 | — |
| Feb 2025 | 98 | — |
| Mar 2025 | 118 | — |
| Apr 2025 | 151 | — |
| May 2025 | 120 | — |
| Jun 2025 | 139 | — |
| Jul 2025 | 135 | — |
| Aug 2025 | 144 | — |
| Sep 2025 | 193 | — |
| Oct 2025 | 160 | — |
| Nov 2025 | 102 | — |
| Dec 2025 | 102 | — |
| Jan 2026 | 123 | — |
| Feb 2026 | 109 | — |
| Mar 2026 | 161 | — |
| Apr 2026 | 157 | — |
| May 2026 | 116 | — |
| Jun 2026 | 186 | — |
| Jul 2026 | 134 | — |
| Aug 2026 | 139 | — |
| Sep 2026 (forecast) | ≈ 140 | 110–190 |
| Oct 2026 (forecast) | ≈ 140 | 110–190 |
| Nov 2026 (forecast) | ≈ 140 | 111–189 |
| Dec 2026 (forecast) | ≈ 140 | 117–192 |
| Jan 2027 (forecast) | ≈ 140 | 118–197 |
| Feb 2027 (forecast) | ≈ 140 | 121–197 |
Counts are permits issued per calendar month as San Bruno 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 San Bruno?
Based on 3,784 San Bruno permits applied for between Sep 2023 and Jun 2026, the typical (median) permit was issued 1 day after application, and the middle half of permits took 0–14 days. One in ten took longer than 103 days.
| Permit type | Median | Typical range | Permits |
|---|---|---|---|
| All permits | 1 day | 0–14 days | 3,784 |
| Residential building | 1 day | 0–32 days | 1,473 |
| Commercial building | 42 days | 1–146 days | 195 |
| Trade (electrical, plumbing, mechanical) | 1 day | 0–7 days | 2,109 |
| ADU | 263 days | 125–416 days | 107 |
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 — California
California mandates ministerial (by-right) approval of accessory dwelling units statewide, with a 60-day decision deadline and one ADU plus one junior ADU allowed on most single-family lots; owner-occupancy is generally not required.
SB 9 allows by-right duplexes and urban lot splits on single-family lots, and newer transit-oriented upzoning (SB 79) phases in from 2026.
Data source
Sourced from City of San Bruno (MyGovernmentOnline / ArcGIS). Public records (no declared open license).
Nearby cities — California
Learn more about ADUs & building permits
Background reading on accessory dwelling units, building permits, and how Igni turns San Bruno permit records into leads.
San Bruno permit data — FAQ
Where does Igni get San Bruno permit data?
How fresh is San Bruno permit data?
How long does it take to get a building permit in San Bruno?
Is construction activity growing in San Bruno?
Does San Bruno allow accessory dwelling units (ADUs)?
Get permit leads — San Bruno
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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.