Based on many 'four post structures', this was built as a granary (although currently storing wood). On a working farm a granary would have been necessary to store food grain safely. The legs are oak posts, stripped of bark, set 18 inches (0.5m) into the ground. On the top of these posts are wider discs of wood to deter rats and mice from attempting to climb up them. (When later granaries were built, they were put on stone 'mushrooms' called Staddle Stones for exactly the same reason.)
The structure is 4ft x 6ft (1.3 x 2m) and 5ft (1.75m) high and is built from oak. The joints have been based on finds. It is held together entirely by joints, no nails or pegs used.
The rafters in the roof are stripped of bark so there is nowhere to harbor pests such as insects.
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Grain store - Butser 
