Heighington is not listed in Domesday Book as a settlement in the county. Given that the building has always been known as a chapel, not a church, it is likely that its origin was as a 'chapel of ease' or a 'field church' in relation to the parish church of Washingborough, the parish to which Heighington has always belonged. According to Frank East, what may be the first written documentation of a religious structure at Heighington is found in the Kirkstead Cartulary, c. 1200, where a priest of 'Hictington', named William, appears as a witness to a deed of gift. Much later, a will of 1524 clearly records a gift to the chapel of Heighington. Thomas Garratt, who purchased the chapel from the Crown c. 1619, set up a Trust fund in his will for the chapel to be used as school. The Trust still owns the chapel. In 1993 the Bishop of Lincoln, Robert Hardy, dedicated the chapel to St. Thomas.