Archaeological excavation on High Street, Shoreham-on-Sea, West Sussex revealed new evidence for the development of the town. Apart from a few stray finds of prehistoric struck flints, the site and adjacent areas were first lightly used in late Iron Age and early Roman times. No further use is documented until the late 12th century, when the formation of New Shoreham is historically documented. The site is then well used during the 13th and 14th centuries for domestic occupation activities, perhaps as a part of a single, large landholding. In common with many other medieval settlements across England this use comes to an abrupt end in the late 14th century, an observation easier to make than explain, though epidemic disease, economic decline or, for a coastal town, naval warfare, may all have their part to play. Sustained reuse was not to take place until 19th-century terraced houses were built, followed by a cinema, car show room, and latterly, the residential accommodation which necessitated the excavations described below. This paper includes reports on modest but significant assemblages of pottery and animal bones (among other finds). The quantity of ship nails among the metal finds suggests ship-breaking was among the activities on the site or nearby.