Steelsheds.com is your destination for steel sheds, cellar doors, steel buildings, basement lockers and more! history. established in 1950. we started out in 1950 by building the toughest steel sheds, garages, cellar doors and commercial buildings money can buy. we're based in the historic town of amityville, in long island's south shore.. This video commercial profiles steel sheds and cellar doors from man products, a leader in heavy duty shed manufacturing.. All steel sheds have a wall height of 6ft 6″ and an apex of 8ft. all sheds as standard come with sliding door, this can be positioned anywhere in the unit to suit our customer’s needs – no more dangerous swinging doors to be caught by the wind. all steeltech sheds include clear lights in the roof..