<p>There is a mobile shelter for construction sits. The shelter in a position of use includes a canopy (3) with a frame structure (5, 6) having suspension points (8) connected by cables (7) to an overhead support such as the articulated arm (4) of a mobile crane (4) A. There is stabilisation means in the form of weights (10) connected by cables (7) to comer (8) and intermediate side fittings (12) to hold the canopy against wind forces.</p>