Report on a magnetometry survey, conducted to inform proposed housing development on two fields, located to the north and south of Grantham Road, Sleaford. Few magnetic anomalies of potential archaeological origin were recorded, though a number of linear features recorded in the northern field could represent former field boundaries. Considerable magnetic disturbance was present in the southern field, especially in the western half, and very likely relates to the construction of the adjacent Sleaford bypass.