Thirteenth floor

It has been suggested that this article be merged into Triskaidekaphobia. (Discuss) Proposed since May 2024.

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The thirteenth floor is a designation of a level of a multi-level building that is often omitted in countries where the number 13 is considered unlucky.^[1][2] Omitting the 13th floor may take a variety of forms; the most common include denoting what would otherwise be considered the thirteenth floor as level 14, giving the thirteenth floor an alternate designation such as "12A" or "M" (the thirteenth letter of the Latin alphabet), or closing the 13th floor to public occupancy or access (e.g., by designating it as a mechanical floor).

Reasons for omitting a thirteenth floor include triskaidekaphobia on the part of the building's owner or builder, or a desire by the building owner or landlord to prevent problems that may arise with superstitious tenants, occupants, or customers. In 2002, based on an internal review of records, Dilip Rangnekar of Otis Elevators estimated that 85% of the buildings with at least thirteen floors ^{[clarification needed]} with Otis brand elevators did not have a floor named the 13th floor.^[3] Early tall-building designers, fearing a fire on the 13th floor, or fearing tenants' superstitions about the rumor, decided to omit having a 13th floor listed on their elevator numbering.^[3] This practice became commonplace, and eventually found its way into American mainstream culture and building design.^[3]

Vancouver city planners have banned the practice of skipping 4s and 13s, since it could lead to mistakes by first responders, for example going to the wrong floor.^[4]