Method and device for installing a panel (8) and a building structure (1) provided with a panel. The invention relates in particular to installing a glass pane in a roof structure of a greenhouse. It is proposed to provide the window (4,5,6) into which the panel (8) is to be fitted on at least three sides with framing sections (11,15,25) which are displaceable between a receiving position in which the window can move freely along the latter and a fitted position. The framing sections are brought to the fitted position by folding them over. This can be effected by means of a hinge action, deforming action or the like.
