Earl Marshal Training Centre and attached boundary walls

The Earl Marshal Training Centre, formerly Grimesthorpe School, is a school building dating from 1874-75, with alterations made in the mid and late 20th century. Designed by Innocent & Brown for the Sheffield School Board, it is one of the earliest schools in England built following the 1870 Education Act. The building is constructed of rock-faced stone with ashlar dressings, featuring gabled and hipped slate roofs. It has three ridge stacks with paired square flues linked by louvred openings and a shouldered side wall stack. The architectural style is Gothic Revival.

The exterior displays a plinth, string courses, sill bands, and coped gables. The two-storey, basement-level building has a T-plan configuration and 15 windows across the front. The central double-gabled wing is flanked by buttresses. The double-gabled central wing has four shouldered windows above which are two pointed arched recesses with hoodmoulds containing double lancet windows. A retaining wall to the basement has a recess with a shouldered doorway under a relieving arch. The returns feature an off-centre canted wing with a hipped roof and irregular fenestration.

At the rear of the wings, there are two windows on each floor, the upper ones shouldered. To the front of the wings is a single shouldered window on each floor. The main range has two shouldered windows on each floor, extending to a projecting hipped end bay. The right end bay has three shouldered windows and a large blocked pointed arched opening with an inserted door below. The left bay has two windows and a similar blocked opening below. The left return is characterized by five shouldered windows with a shouldered panel and datestone below. The ground floor features two large blocked pointed arched openings. To the right is an angle buttress topped with an octagonal bellcote and octagonal spire. The right return mirrors the fenestration on the left.

The rear elevation showcases a central double gable with six windows, flanked by window ranges of four windows each. Hipped wings extend from this central section, featuring two windows to the right and three to the left, with a pointed arched opening incorporating double garage doors below.

The enclosing boundary wall is constructed with rock-faced gabled coping, stepped and ramped, with buttresses along the Earl Marshal Road side. Two gateways and a renewed railing are present on the Earl Marshal Road side, and two gateways on the Grimesthorpe Road side. A rear retaining wall stands approximately 4 metres high.