The design being a "tin tabernacle" with a 45 feet nave and being 60 feet. 10 inches in length overall. This structure was erected by a local builder at right angles to King Street, and according to two rather oblique references within "The Derbeian", the construction took place before 1891. This "tin tabernacle" was only ever intended to be a temporary building and, by then, monies were being raised by the trustees for a permanent structure. An Old Derbeian, who was also an architect Percy Heylin Currey (1864-1942) was commissioned to design a chapel so that as monies became available it could be extended. The dedication of the chapel, as originally built with just four bays, took place in the late 1880s. Subsequently with additional monies donated the fully designed Derby School Chapel was dedicated to St. Helen in 1891. In the next three years additional monies were subscribed to the School Chapel fund and so in 1894 with extra money available the building was extended by the addition of three further bays to the west towards King Street. The completed chapel building was finished in 1894.