Longcross barracks was still a young establishment when it reached the end of its 29 year operational life in 2004. The land on which the the barracks stands was part of a large parcel of Chobham common which has been owned by the crown since the second world war, but it wasn't until 1975 that work began on constructing the barracks. The barracks are part of a larger complex of former military facilities in the area. To the north of the barracks lies the former Defense Evaluation and Research Agency establishment of Chertsey North which is separated from the barracks by the M3 motorway built across the crown lands in 1971. The two sites are linked by a pedestrian subway beneath the motorway carriageway. The southern boundary of the barracks site runs along Longcross road from which it takes its name.

The barracks are much to small to have accommodated an operational army unit, they were constructed solely to provide accommodation for the staff and visitors to the evaluation facilities in the area. The barracks consisted of five single or double story buildings centered around a central grass square. Each were constructed of brown brick using domestic construction methods. The buildings themselves contained the accommodation rooms the main reason for their construction along with the Officers and Sergeants mess facilities typical of an military base. The entire site was and still is surrounded by a tall razor wire topped chain link fence.

Each of the five buildings were given an identification number which is still displayed on large acrylic signs today. Building 220 is the closest to the main gates, a single story guard house containing a security office overlooking the entrance road and a rest room come kitchen and toilet facilities behind. Across the access road a rolling gate and single arm barrier controlled from the security office controlled entry to the barracks. Opposite the security hut a small brick rifle butt provided a sand bank for stacking and discharging the guards rifles. Inside the guard house the security monitors for controlling the sites CCTV cameras is still in place along with an alarm panel for alerting the barracks guests to bomb or mortar attacks.

Continuing down the main barracks road its soon divides with a military signpost still pointing in the direction of the training center car park to the right and the Warrant officers and sergeants mess to the left. Directly ahead along a slab path way is the first of the main barrack buildings, building 216. The sign post indicates that it was the offices and stores building. Building 216 is a single store detached building which was used for a variety of administrative purposes during the barracks life. It was originally constructed as the headquarters for the site with offices for the military police detachment and the site clerks along with a small gymnasium. Later in the barrack's life it was used as an administration office for the Defense Logistics Organization.

Within the building there are a series of offices laid out around a pair of internal courtyards on either side of the gymnasium which occupies the center of the block. Very little remains inside the administration block and each of the offices is empty and anonymous, only one whose windows are still protected by internal bars gives away its past as the military police offices. Although on one of the bare walls a laminate sheet outlines the execution of Operation Wideawake, a procedure introduced in 2003 for conducting a thorough search of the barracks if a terrorist threat was suspected. At the back of building 216 three was a small three garage for the headquarters vehicles.

A short distance across the grass from the administration block was building 219 originally constructed as a NAAFI facility with a bar, kitchen, recreation rooms and t. Adjoining the building at first floor level was a small annex building 219B which was occupied by the Quartermasters Stores and the NAFFI managers quarters. In 1995 the NAFFI was converted to a training center and in 2000 the managers quarters were converted to an officers mess for the barracks three officers. Today the building has been emptied of its contents, but lying abandoned on the Bar were a number of obsolete training manuals including a maintenance guide for Rover SD1 cars and a 1980's vintage infantry training manual. One of the more interesting finds was a slab of Warsteiner pilsner cans with an expiry date of 1995 the last year the NAFFI bar was open. Outside the bar area a patio area was completed with a brick barbeque constructed of the same bricks as the rest of the barrack buildings, at the time the barracks was completed a brick Barbeques were the height of fashion. At the back of the buildings was one of two car parks which had spaces reserved for the Quartermaster and the Quartermaster Sergeant.