Description Building A is better known to us as Thirlings Hall, so named after the Early Medieval settlement of Thirlings in Northumberland which was extensively excavated between 1973 and 1981 by Roger Millet and Colm O’Brien. One of 12 buildings at Thirlings, Building A was chosen as the subject of a (re)construction experiment as it was well-documented in the archaeological record, somewhat typical of buildings from the era and had some irregularities which, it was decided, would make it and interesting example to build and analyse further. Due to the acidity of the Thirlings site, no timbers remained in the ground and there are no timber buildings from the era still standing so we can never be certain about some details, finishes and uses however the (re)construction was done with integrity. Perhaps buildings of this type would have been divided into separate spaces with partition walls or included a mezzanine level but because we cannot know, the internal space has not been embellished beyond what there is strong archaeological evidence for.