Benchmarks → Brooklyn → Alteration CO
Brooklyn Alteration CO permits: median 98 days in review
Across 2,738 Alteration CO filings in Brooklyn over the last 24 months, the median time from filing to first permit was 98 days. One in five took longer than 202 days (the 80th percentile).
Job type: Alteration with a new Certificate of Occupancy (Alt-1/Alt-CO). Source: NYC DOB NOW public filings (data.cityofnewyork.us), recomputed weekly. Last computed 2026-08-30.
Alteration CO across the boroughs
| Borough | Median days | p80 days | Filings |
|---|---|---|---|
| Bronx | 83 | 193 | 959 |
| Brooklyn | 98 | 202 | 2,738 |
| Manhattan | 114 | 236 | 1,380 |
| Queens | 105 | 207 | 1,723 |
| Staten Island | 88 | 201 | 337 |
What this means for your filing
If your Brooklyn Alteration CO job has been in review for less than 98 days, it's inside the normal range — pushing DOB now is unlikely to help. Past 202 days, your filing is slower than 80% of comparable jobs and is worth chasing: check for open objections, incomplete items, or a plan-examiner queue issue.
Look up your job number free to see its live status and how it compares — or track your whole client book and get flagged automatically when any permit crosses its borough benchmark.