 Located on a site originally occupied by a foreman 's office when the land was used for quarrying , the new sawmill building was completed in 1899 , providing electricity via two enclosed steam engines and pneumatic power across the estate . The engines were housed in what is now called the Engine Room , while the Lantern Room held multiple lead acid batteries . After opening , the decision was made to relocate the estate 's entire sawmill to the building , to enable better access to electrical power . The steam engines were replaced by diesel generators , and electricity was provided from the national grid post @-@ WW2 . In the 1960s , the sawmill was decommissioned and all wood sold to third party contractors to be converted into sawn wood products . 
