Code: Vault (Below-sidewalk building space)
Description: (Sidewalk Vault) is a structure or enclosed space located below a sidewalk, usually connected to the adjoining building. Repair, alteration, or restoration of a building vault requires a NYC DOT permit, and most vault work also requires DOB-approved plans and a DOB permit.
Practical Meaning: A damaged sidewalk above a vault is not an ordinary sidewalk-repair job because the sidewalk surface may also be the vault roof and a structural element. The owner should use a qualified design professional and contractor to determine the required DOB filing, structural restoration plan, and DOT vault permit before work begins.
Where You May See It: You may see this term in DOB NOW filings, DOT permit applications, DOT-approved vault plans, sidewalk violation notices, engineering drawings, title reports, or contractor proposals for sidewalk restoration.
Why It Matters: Work on a vault without the required approvals can create pedestrian-safety and structural risks and may lead to enforcement or permit problems. NYC DOT requires a permit for construction, alteration, or repair of a building vault, while most vault projects also need DOB plan approval and a DOB permit; the DOT engineering package specifically calls for DOB-approved building-vault repair structural plans for final approval.
Source: NYC DOT Vault Permit Information