What is an Alt-2 filing in NYC?

An Alt-2 is an interior renovation that does not change use, occupancy, or means of egress. No new Certificate of Occupancy is issued. Multiple work types can be included on one job and licensed trades pull sub-permits.

When do I need Alt-1 instead of Alt-2?

File Alt-1 if the project changes use, occupancy, or egress, or includes structural work or enlargement. Alt-1 may also be required when work results in a new or amended Certificate of Occupancy.

Do I need an architect to file Alt-2?

Yes. Alt-2 jobs are filed by a Registered Design Professional (RA/PE). Licensed trades then obtain their sub-permits for plumbing, electrical, sprinkler, mechanical, etc.

Alt-2 Filing

Alt-2 Filing (Alteration Type 2) — NYC DOB

Definition: Interior renovation that does not change use, occupancy, or means of egress. No new Certificate of Occupancy is issued. One job can include multiple work types (GC, PL, EW, MH, SP, etc.).

Quick checks

No structural changes or enlargement
No new dwelling unit or change to occupancy classification
Egress paths and exits unchanged

Typical Alt-2 scopes

Full interior gut (non-structural) of an apartment or townhouse
Adding/moving non-load-bearing partitions
Kitchen/bath remodels with plumbing or electrical relocations
Door/window and finish changes within existing openings
In-unit sprinkler head relocations, HVAC rework

Not Alt-2 → file Alt-1

Any change to use, occupancy, or egress (e.g., new unit, egress stair)
Structural work or building enlargement
Exterior changes that affect egress or zoning bulk

What the filing involves

Plans by a Registered Architect/Professional Engineer
DOB plan review or Professional Certification
Special Inspections (TR1/TR8) as applicable; asbestos form (ACP-5/10); Tenant Protection Plan if occupied
Licensed trades pull sub-permits under the Alt-2 job
Final inspections and sign-offs; no new CO

Notes: Minor plumbing may qualify for an LAA instead of Alt-2. Landmark buildings (LPC) and co-op/condo boards can add approvals even when Alt-2 fits.