Benchmarks → Manhattan → Alteration CO
Manhattan Alteration CO permits: median 114 days in review
Across 1,380 Alteration CO filings in Manhattan over the last 24 months, the median time from filing to first permit was 114 days. One in five took longer than 236 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 Manhattan Alteration CO job has been in review for less than 114 days, it's inside the normal range — pushing DOB now is unlikely to help. Past 236 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.