An integrated glazing unit, comprising: a first substrate; a first transparent conductive layer on the first substrate; a first bus bar applied to the first substrate and the first transparent conductive layer; a second substrate; a second transparent conductive layer on the second substrate; a second bus bar applied to the second substrate and the second transparent conductive layer; at least one layer of electrochromic material (110, 114, 118); a third substrate; a third transparent conductive layer on the third substrate; a third bus bar applied to the third substrate and the third transparent conductive layer; a fourth substrate; a fourth transparent conductive layer on the fourth substrate; a fourth bus bar applied to the fourth substrate and the fourth transparent conductive layer; at least a second layer of electrochromic material; a first pane of glass or plastic attached to the first substrate; a second pane of glass or plastic attached to the fourth substrate; a third pane of glass or plastic attached by a spacer to the second pane; wherein: the first substrate, the at least one layer of electrochromic material (110, 114, 118), and the second substrate form a first laminated assembly, with at least a portion of a first edge of the second substrate recessed relative to at least a portion of a first edge of the first substrate, exposing at least a portion of the first bus bar for electrical connection; the third substrate, the at least the second layer of electrochromic material, and the fourth substrate form a second laminated assembly, with at least a portion of a first edge of the third substrate recessed relative to at least a portion of a first edge of the fourth substrate, exposing at least a portion of the fourth bus bar for electrical connection; and the first laminated assembly and the second laminated assembly are attached such that the second and third substrates are attached and the first and fourth substrates are facing outwards. a first substrate; a first transparent conductive layer on the first substrate; a first bus bar applied to the first substrate and the first transparent conductive layer; a second substrate; a second transparent conductive layer on the second substrate; a second bus bar applied to the second substrate and the second transparent conductive layer; at least one layer of electrochromic material (110, 114, 118); a third substrate; a third transparent conductive layer on the third substrate; a third bus bar applied to the third substrate and the third transparent conductive layer; a fourth substrate; a fourth transparent conductive layer on the fourth substrate; a fourth bus bar applied to the fourth substrate and the fourth transparent conductive layer; at least a second layer of electrochromic material; a first pane of glass or plastic attached to the first substrate; a second pane of glass or plastic attached to the fourth substrate; a third pane of glass or plastic attached by a spacer to the second pane; wherein: the first substrate, the at least one layer of electrochromic material (110, 114, 118), and the second substrate form a first laminated assembly, with at least a portion of a first edge of the second substrate recessed relative to at least a portion of a first edge of the first substrate, exposing at least a portion of the first bus bar for electrical connection; the third substrate, the at least the second layer of electrochromic material, and the fourth substrate form a second laminated assembly, with at least a portion of a first edge of the third substrate recessed relative to at least a portion of a first edge of the fourth substrate, exposing at least a portion of the fourth bus bar for electrical connection; and the first laminated assembly and the second laminated assembly are attached such that the second and third substrates are attached and the first and fourth substrates are facing outwards. the first substrate, the at least one layer of electrochromic material (110, 114, 118), and the second substrate form a first laminated assembly, with at least a portion of a first edge of the second substrate recessed relative to at least a portion of a first edge of the first substrate, exposing at least a portion of the first bus bar for electrical connection; the third substrate, the at least the second layer of electrochromic material, and the fourth substrate form a second laminated assembly, with at least a portion of a first edge of the third substrate recessed relative to at least a portion of a first edge of the fourth substrate, exposing at least a portion of the fourth bus bar for electrical connection; and the first laminated assembly and the second laminated assembly are attached such that the second and third substrates are attached and the first and fourth substrates are facing outwards.