This group maintains the Essex Heritage Conservation Record (ECHR) which is a computerised database of all listed buildings and all known archaeological sites in Essex. There are well over 30,000 entries on the database with supporting maps indicating site location and extent), backed up in many instances by photographs, drawings and substantial written accounts.
The ECHR is based in County Hall, Chelmsford and is a public record and can be consulted during normal office hours Monday to Friday.