Jettying

This article is about the building technique. For the marine structures, see jetty.

"Oversailing" redirects here. For oversailing by tower cranes, see Crane (machine) § Tower.

A double jettied timber-framed building. The ends of the multiple cantilevered joists supporting the upper floors can easily be seen.

A jettied portion of the façade from a 16th century London house is preserved in the Daylit Gallery of the Victoria and Albert Museum (also note the "carell" windows).

Jettying (jetty, jutty, from Old French getee, jette) is a building technique used in medieval timber-frame buildings in which an upper floor projects beyond the dimensions of the floor below. This has the advantage of increasing the available space in the building without obstructing the street. Jettied floors are also termed jetties. In the U.S., the most common surviving colonial version of this is the garrison house. Most jetties are external, but some early medieval houses were built with internal jetties.