Archaeologists found buried ‘treasures’ on the site of the old tax office, Holland House, in High Street, Spalding.
Among artefacts were pieces of pottery dating from the early modern period 1800-1900 back to early medieval handmade ware of 1100-1250.
The evaluation showed a probable medieval land surface cut by a possible pit of 12th-13th century date and the next occupation of the site appeared to have been in the late 15th to early 17th centuries, with several pits of that date recorded.
The survey was carried out before work could start on a new housing development by D & R Property Services and a report has gone to the district council. The developers started piling work last week and the overall project is expected to take 18 months to complete.