An area of great defensive value was chosen as the castle’s construction site, located on a high peninsula between the lakes Człuchów Duży and Człuchów Mały. The isthmus length was 1 km and the width was from about 100 to 500 meters. The whole complex was located at the base of the peninsula in its narrowest part and consisted of the upper castle, which was the seat of the commander and the Teutonic convent, and of three outer wards in the western, northern and eastern part, housing economic bases of the caommandry. The castle was surrounded by stone-brick walls, and additional defense was provided by three deep, artificially dug moats, crossing the peninsula and connecting with the waters of both lakes. These moats separated individual parts of the castle, which provided additional protection, especially because through two of the outer wards, west and central, led the way to the upper ward.
The upper castle was built on a square plan with a side of 47.5 meters. It consisted of four wings with cloisters from the courtyard side. In the north-west corner a huge, octagonal main tower stood 45 meters high and 5 meters thick at ground level. It was originally crowned with a steep roof, and the entrance to it was at the height of the fifth floor after crossing the drawbridge (16 meters above the level of the courtyard). Stairs placed in the thickness of the tower wall already led to the upper floors. In total, the main tower had as many as 11 floors above ground and two basements, where there was a well with drinking water in the event of a siege and a prison dungeon. The main entrance adjoined tower from the east, preceded by a neck, leading to a drawbridge. Probably the upper castle was devoid of corner turrets, but it had an external perimeter of the wall giving off a small zwinger area.
The main rooms of the upper castle were on the first floor: a two-storey chapel in the north wing, two three-bay rooms (maybe a dormitory) in the east, and a refectory in the west. In the shorter southern wing there could have been guest rooms and a passage to latrine tower, 25 meters forward towards the lake. The ground floor was occupied by a kitchen, arsenal, brewery and service rooms. Under each wing, there were also cellars, topped with barrel and pointed vaults, intended for warehouses and pantries. Entrances to them led from the courtyard down several stairs. At the top, on the other hand, there were warehouse and defensive attic typical for Teutonic castles, intended for storing grain, clothing and weapons, as well as equipped with galleries with loop holes, running around the perimeter walls. The castle was heated by a furnace at the level of the ground floor, from which warm air flowed into the chambers with ducts in the thickness of the wall.
The western ward was founded on a plan similar to a rectangle. It was separated from the upper castle by a deep and wide moat, and another moat was from the west, i.e. from the town side. The west ward was surrounded by a defensive wall with three towers, built on a square plan, located in the north-west and south-west corners, and more or less in the middle of the west curtain. Therefore, only the side facing the town was secured. Stables and a granary were located in this ward, later also an arsenal of weapons. There was also a well for watering horses here. Communication with the upper castle and the town was via drawbridges.
The northern ward was directly connected to the upper castle and was fortified with a wall touching the zwinger (outer) wall of the convent’s house (upper castle). The entrance to it from the west was protected by one or two four-sided towers, while from the upper castle it was separated by a ditch. Drawbridges were placed through the moats.
The eastern ward was the largest, occupying an area of 100×150 meters. Its perimeter walls were reinforced with four towers: three four-sided from the north and one cylindrical in the south-east corner. In the courtyard of the outer ward there were economic buildings, pigsties, barns, coach house, brewery, etc. In the southern wall there was a wicket gate leading to the bathhouse located on the lake. The steep slopes of the hill on the south side, to protect from landslides, were originally walled with erratic stones.