Block D is a long, highset, gable-roofed building with semi-enclosed stairs at either end of the north-facing verandah.
The exterior is clad in chamferboards, including the stairs and the eastern, southern and western sides of the understorey.
An original gable-roofed projection to the north is at a right angle to the main building and connects with the covered walkway to Block B. An adjacent ground floor covered walkway connects with Block F to the east.

The southern wall has large areas of timber awning windows and the verandah wall has double-hung timber sashes, both with fanlights.
The verandah has full height (continuous) timber posts, timber floors, raked ceilings and enclosed bag rack balustrades, which are clad in profiled metal.
Classroom doors are half-glazed and boarded.

The first floor contains five classrooms and a staff room, with the three central classrooms divided by original timber-panelled folding partitions.
The interiors are lined with flat sheeting, with rounded cover strips above dado height and on the ceilings.
The northern projection has double-hung timber sash windows, and contains adjoining office and store rooms.

The understorey combines open play space and enclosed areas for a staff lounge (western end) and store room (northern projection).
The floor structure of the classrooms above is exposed, with the timber bearers supported on concrete piers.
The understorey floor is concrete.

A lowset, skillion-roofed uniform shop (former entranceway, 1956) connects the western end of Block D with Block C. The walls are brick, with fixed glazing and battened sheeting flanking a modern flush-finish door.
A concrete slab with faceted corners projects south of the entranceway, and has a rectangular modern skillion-roofed awning over.
An enclosed cantilevered walkway along the northern side connects the first floor verandahs of the two adjoining buildings; it is clad in corrugated metal and has high-level fixed windows.
The interior is flat-sheeted and the ground floor has a modern suspended ceiling.
Block D is a long, highset, gable-roofed building with semi-enclosed stairs at either end of the north-facing verandah. The exterior is clad in chamferboards, including the stairs and the eastern, southern and western sides of the understorey. An original gable-roofed projection to the north is at a right angle to the main building and connects with the covered walkway to Block B. An adjacent ground floor covered walkway connects with Block F to the east.
The southern wall has large areas of timber awning windows and the verandah wall has double-hung timber sashes, both with fanlights. The verandah has full height (continuous) timber posts, timber floors, raked ceilings and enclosed bag rack balustrades, which are clad in profiled metal. Classroom doors are half-glazed and boarded.
The first floor contains five classrooms and a staff room, with the three central classrooms divided by original timber-panelled folding partitions. The interiors are lined with flat sheeting, with rounded cover strips above dado height and on the ceilings. The northern projection has double-hung timber sash windows, and contains adjoining office and store rooms.
The understorey combines open play space and enclosed areas for a staff lounge (western end) and store room (northern projection). The floor structure of the classrooms above is exposed, with the timber bearers supported on concrete piers. The understorey floor is concrete.
A lowset, skillion-roofed uniform shop (former entranceway, 1956) connects the western end of Block D with Block C. The walls are brick, with fixed glazing and battened sheeting flanking a modern flush-finish door. A concrete slab with faceted corners projects south of the entranceway, and has a rectangular modern skillion-roofed awning over. An enclosed cantilevered walkway along the northern side connects the first floor verandahs of the two adjoining buildings; it is clad in corrugated metal and has high-level fixed windows. The interior is flat-sheeted and the ground floor has a modern suspended ceiling.
Dalby State High School