A combination lavatory and galley arrangement for aircraft includes a lavatory portion having adjacent inboard and outboard lavatories, and a galley portion, and can be located aft of aft aircraft aft doors, and can at least partially rearwardly extend into the aircraft's aft pressure dome. The inboard and outboard lavatories can be separated by a movable wall or partition to provide access for persons with restricted mobility, and can be provided in a modular housing to facilitate retrofit assembly within an aircraft. The movable wall can be an articulating movable lavatory partition movable between a first, linearly extended configuration and a second, folded configuration in a stowed position to provide entry for persons with restricted mobility.