About 1300 to 1320: Choir and nave walls
About 1320 to 1340: Start of construction works for the steeple, pillars, vaulting, painting
About 1400: Completion of the steeple
Sources:
Jens Christian Holst / Dirk Schumann M.A. in "Europäische Route der Backsteingotik" / Mucke 1999/2000, 14
Abbildungen der einzelnen Bauphasen aus: Jens Christian Holst / Dirk Schumann M.A. in "Europäische Route der Backsteingotik"