Main block with entrance elevation to Sidcot School

The main block with entrance elevation to Sidcot School was built in 1838. It features a stucco exterior and a grey slate roof. The entrance block is flanked by wings and has a total of thirteen windows, with five located in the central three-storey section. This central block includes plain pilasters, a cornice, and a first-floor cill band. Steps lead up to a large projecting porch that has a cornice, a parapet, and round-headed windows on a slightly projecting central bay. The windows are primarily twelve-light glazing bar sashes, except for the central bay which has sixteen-light windows; the second floor features a pair of eight-light windows divided by a mullion. The low-pitched roof has large flat eaves supported by paired brackets.

The two-storey wings, which are slightly set back, each have three windows. These wings include pilasters, a cornice, and a cill band, along with an added ground floor impost band, recessed aprons, and round heads on the ground floor windows. The wings also have twelve-light glazing bar sashes and eaves similar to the central block. The final bays at either end of the wings are further set back, with the eastern wing altered to include two first-floor windows. A wrought iron lamp bracket is located over the porch.