Does Britain have an equivalent to the U.S. Navy Seabees?
Short answerThe closest counterpart is a commando-trained Royal Engineers formation that supports Royal Marines while remaining institutionally part of the Army.
NotesBritain's commando engineering regiment is the closest counterpart to the U.S. Navy Seabees in the role described by the viewer. Its personnel remain Royal Engineers and part of the British Army. They train for commando service and earn the green beret associated with supporting Royal Marines in demanding expeditionary work. This arrangement places an amphibious engineering function across service boundaries without creating a direct institutional copy of the American organization.