sentences:  The school's headmaster originally had his own house on the school site.The Victorian Gothic red brick house was built in 1863 and was designated as a Grade II listed building by English Heritage in 1984.The original buildings was designed by the Louth Architect James Fowler and further additions were added in 1904-6 by the Lincoln architect Herbert Dunn.As a grammar school it was administered by the Lindsey Education Committee, based in Lincoln, and became co-educational in 1971.