The first building in evidence at the site is dated from the 12^th century; the foundations of this original building were located during excavations in 1975. It is not known what the exact layout of this former building was but it can be judged to have been rectangular and built of sandstone. No evidence of any tower at this time can be found.

The excavations in 1975 also indicated evidence of rebuilding during the fourteenth century that would have encompassed the older building. The chancel and the lower stages of the tower were completed at this time.