It's a square base eleven meters side and its height varies between 13 and 15 meters.

The thickness of the walls is nearly two meters (1.70 to 1.85) for the ground floor and the first floor and 1.5 meters for the second.

On the east side stands the only lower access door with arch that still retains the upper beam where the hinges of the doors were embedded. It can be also seen openings where the beam to fit the door stuck.

On the first floor there is a single hole in the west wall, which for its size seems to be more a door than a window. It presents well carved voussoirs and arch ends.

The second floor is the one with more openings. Two loopholes in the north and east sides and two windows ending in pointed arch arranged asymmetrically in the two remaining sides.

The timber frame would be based on a central stem from which runs the entire structure.

The construction was completed with a roof to four waters.

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Source

Cuadernos de Campoo (nº9,set 1997)

Torres medievales en la merindad de Campoo

Gerardo Hernández Nevado

http://personales.mundivia.es/flipi/cuadernos/cuaderno_9/torres_medievales.htm