Block J is a long, single storey, brick veneer building with an open web steel portal frame.
The building retains its four classrooms, with a passageway along the western side that aligns with the covered way connecting with Block C. A lowset former storage/office wing surrounds the northwest corner.

The low-pitched gable roof of the wing and the skillion roof of the passage are set lower than the gable-roofed core, with clerestory lights between.
The roofs are clad in corrugated metal.
The eastern and western sides of the building are clad in profiled metal below sill height.
Windows on the eastern side of the classrooms comprise modern aluminium-framed sliding sashes, with a continuous fanlight, shaded by an exterior high-level louvred metal awning.
New doors have been added to the eastern side of the classrooms.
Windows on the western side of the passageway, the clerestory and the wing have been removed (at the time of inspection in mid-2016) for replacement.

The interior has been altered, with the removal of some walls, and the addition of some new partitions.
The classrooms have modern suspended ceilings and walls sheeted in plasterboard, concealing and enclosing the open web steel portal frame.
The fabric added in 2016 is not of cultural heritage significance.
Block J is a long, single storey, brick veneer building with an open web steel portal frame. The building retains its four classrooms, with a passageway along the western side that aligns with the covered way connecting with Block C. A lowset former storage/office wing surrounds the northwest corner.
The low-pitched gable roof of the wing and the skillion roof of the passage are set lower than the gable-roofed core, with clerestory lights between. The roofs are clad in corrugated metal. The eastern and western sides of the building are clad in profiled metal below sill height. Windows on the eastern side of the classrooms comprise modern aluminium-framed sliding sashes, with a continuous fanlight, shaded by an exterior high-level louvred metal awning. New doors have been added to the eastern side of the classrooms. Windows on the western side of the passageway, the clerestory and the wing have been removed (at the time of inspection in mid-2016) for replacement.
The interior has been altered, with the removal of some walls, and the addition of some new partitions. The classrooms have modern suspended ceilings and walls sheeted in plasterboard, concealing and enclosing the open web steel portal frame. The fabric added in 2016 is not of cultural heritage significance.
Dalby State High School