The 20th Century Society is trying to block Haworth Tompkins' £6 million plans for the redevelopment of the Young Vic Theatre in London.
The society has written to the DCMS recommending that the 1970 building by William Howell be spotlisted to ensure its praised auditorium is saved from demolition.
Haworth Tompkins won the commission to revamp the theatre last month, beating off competition from Adjaye Associates, Marks Barfield Architects and Tim Ronalds Architects (AJ 6.6.02).
But Clinton Greyn of the 20th Century Society's casework committee said he feared the scheme could include demolition of the auditorium.And he criticised quango The Theatres Trust for its lack of enthusiasm in protecting the 'exciting' structure: 'If we could just see the design we will be reassured.'
The Young Vic defended its plans, claiming it has no intention of demolishing the auditorium.