The National Theatre has objected to a proposed refurbishment of the neighbouring IBM building, arguing the works would have a "harmful impact" on the venue’s heritage value.
A planning application submitted to Lambeth Council includes a refurbishment and extension of the existing building on the South Bank, including a partial demolition to provide additional office, cafe and retail space.
Writing in a comment on the planning application, the National Theatre objected to the proposals on nine grounds.
These included the potential harmful impact of the development on the heritage significance of the National Theatre and the South Bank Conservation Area and the impact of building work on views to and from the theatre.
Other concerns included the potential impact of a new cafe and retail space on the National Theatre’s own cafe spaces and bookshop and noise disturbance from the construction work.
National Theatre executive director Lisa Burger said: "We share others’ disquiet at the impact the reconfigured and extended IBM building would have on the National Theatre along with a number of practical concerns as to construction and operational impacts."
The Theatres Trust also objected to the plans.
A letter from planning adviser Tom Clarke said: "Our principle considerations regarding any development on this site are impacts on the setting of the National Theatre as a heritage asset of great significance and/or on its operation.
"On that basis we object to this proposal because we consider its significance and the way it is appreciated as a heritage asset is enhanced by its setting and relationship with the IBM building; this would be undermined by this development."
Clarke also raised concerns about harm to views to and from the theatre and about the impact of building works.
The letter added: "We are aware the theatre has entered into discussion with the applicant regarding management plans and agreements to manage any conflict.
"Should the council be minded to approve this application we urge that such agreements are conditioned to safeguard the theatre’s operations."
IBM has been contacted for comment.