Disclosed is a sill assembly and sill that can be positioned continuously under doorways with swing doors, sidelites, and vertical door frame members such as vertical jambs, and mull posts, or the vertical members of sidelites. One variation of the sill assembly can be used for inswing doors while another can be used for outswing doors. The sill assembly includes a backstop and optionally can include end dams. These in combination with the structure of the sill assembly shed water away from the building structure and allow for the possibility of the sill assembly being installed without an additional sill pan or flashing. The sill assembly can optionally include one or more thermal breaks. The sill assembly can be structured so the thermal breaks of the door, sidelites, and vertical door frame members all align with the thermal breaks of the sill assembly.