A limited special two-disc edition of The Back Room was released in the United Kingdom, the second disc (called Cuttings) comprising unused tracks from the album recording sessions and B-sides. In the Netherlands and Germany, the album was re-released in a limited, Festival Edition CD/DVD set including a 50-minute concert recorded at Paradiso in Amsterdam, on 30 January 2006.
Editors received substantial critical acclaim for their release of The Back Room. NME gave it a rating of 8/10 saying "Never before have doom and gloom sounded so surprisingly uplifting and hopeful" and that Editors "have created a debut that will endure." Drowned in Sound gave The Back Room a rating of 9/10, citing, "this is a record many people will be able to live inside for a very long time." The album also received a 2006 Mercury Prize nomination.
The Back Room received generally positive reviews with a Metacritic score of 76 based on 23 reviews.E! Online has written that "The Back Room is a fine album that proves you can look backward while paving the way forward", giving an album score 91 of 100. Drowned in Sound has written that it's "how Interpol would sound like if they dealt with universal themes and reflection rather than singing about fellatio fantasies with Stella, or their length of loves". AllMusic Guide said that "Alternative rock hasn't seen anything like this since the release of Turn on the Bright Lights." NME wrote that "this is a debut that will endure", and The Guardian wrote "The longer you listen, the better they become." However, Pitchfork Media has written that "Editors sound like an earnest rock band who grew up loving the same bands as the current batch of revivalists, but beyond the workmanlike interpretations of their heroes, it's hard to swallow."