A sill assembly 2 for a vehicle comprises an inner extruded sill member 21 configured to be secured to a vehicle body and an outer extruded sill member 23 secured to the inner extruded sill member 21. The inner or outer sill members 21, 23 may each comprise a cavity which may each be divided by a reinforcement structure into at least two cavities. An outer side wall of inner member 21 and an inner side wall of outer member 23 may conform to each other’s shape, for example each may be substantially flat or each may comprise a step, and may also comprise openings which may be offset in a vertical or longitudinal direction. Inner member 21 may be connected to an underfloor, a battery pack or a side frame 30, and outer member 23 may be connected to a side frame reinforcement 40.
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