External alterations to the existing building to create new openings including installation of doors, windows and louvres. Internal alterations to existing building to provide windows within internal walls, reception area, waiting area, offices and storage accomodation, installation of portable buildings upon the site for use as canteen, meeting room and welfare facilities, installation of vehicle lifts, ramps and testing equipment. Installaiton of noise controlled machine room and fume extraction unit. Installation of weigh bridge and vehicle wash area and associated works.