After the Norman Conquest, the manor of Tidenham, which included Sedbury, fell within the lordship of Striguil, or Chepstow.

Later, huts were built for Royal Engineers working to establish the National Shipyard at Beachley, and houses were constructed at Pennsylvania Farm (now Mercian Way).

Sedbury House is a Grade II* listed Georgian building designed by Sir Robert Smirke, the architect of the British Museum.

In 1825 it was bought by the historian and antiquary George Ormerod, who renamed it Sedbury Park, and commissioned Smirke to add classical colonnades and a portico to the existing house.

At the top of Sedbury Cliff overlooking the Severn Estuary is one end of the Offa's Dyke Path, a waymarked long-distance footpath and National Trail, stretching to Prestatyn in North Wales, close to the Wales-England border.