CFA Archaeology Ltd carried out an archaeological strip map and record on a proposed extension to the rear of 143 Trinity Road, Hertford Heath (centred on TL 35119, 11353). The property lies close to a scheduled Iron-Age cremation cemetery; other remains dating to the Bronze and Iron Ages have been discovered nearby. The work involved monitoring the foundation trenches down to natural gravels. No archaeology was revealed and the site of the extension appears to have been landscaped during the 1960s when the house was constructed.