In an exclusive interview with DS, executive producer Diederick Santer confirmed that the quality of some parts of the outside set "don't pass muster" in the higher quality filming.
"What we've concluded is that everything is there for us in design terms for us to upgrade to HD apart from the exterior set, which is 24 going on 25 years old," Santer revealed. "And it shows, particularly in the brickwork on the Square and Bridge Street which doesn't pass muster on HD."
He confirmed: "Until we've either completely refurbed the exterior set or moved the programme somewhere else and built it from scratch, then we're not going to be going HD."
Speaking of the potential relocation from EastEnders' current home in Elstree Studios in Borehamwood, Herts, Santer said: "I'd love to pretend that it was in any shape or form my decision, but it's tied up in lots of very big questions for the BBC regarding finance, property and how to best protect one of the corporation's greatest assets."
He added: "It's a complicated question, but there's been no decision made either way."
Tabloid reports speculating as to the new location have been circulating since July 2007, with rumoured destinations including Buckinghamshire's Pinewood Studios, Wales, Bristol and Cardiff.
In October, BBC director of vision Jana Bennett delivered a keynote speech entitled 'BBC Beyond The M25', which detailed plans of "a radical shift in the whole set up of broadcasting". Under the Out Of London strategy, it is expected that by 2016, 50% of all BBC output will be produced outside the capital.
In March, the BBC confirmed that BBC One's flagship medical drama Casualty will relocate from its current Bristol home to the public broadcaster's Cardiff drama base.
> Click here to read our full interview with Diederick Santer