The usual sequence
- A Licensed Master Plumber locates and repairs the problem, under a DOB permit where required
- The repaired piping is pressure-tested
- The work is inspected and signed off
- The utility restores service and relights appliances, or the plumber does
How long it takes
A single apartment line can be back in days. A building riser or service line can take weeks, because it involves permits, a sign-off and scheduling with the utility. Starting the repair quickly is the main thing an owner controls.
In the meantime
Owners commonly provide hot plates or other temporary cooking for affected tenants, and keep them informed with a timeline. Check with your managing agent and counsel on obligations for your building.