The heritage quango has claimed that Judd's proposed mixed-use development will drastically affect the setting of Horace Jones' Grade II*-listed Leadenhall Market ( pictured).
EH experts have said that Rolfe Judd's proposals, which are being recommended for approval, are much higher than existing buildings on the site, which would be demolished if the scheme were approved.
EH has also claimed that the designs do not provide a 'restrained backdrop' to Jones' building.
In a letter sent to the Corporation of London, an EH spokesperson says: '[We express] regret that the previous building line [is not] being reinstated.'
Rolfe Judd proposes to replace two existing buildings with a single eight-storey office and retail building.
City planners will consider the scheme next Thursday.