Scores on the Doors website has partnered with the Sustainable Restaurant Association (SRA) to include sustainability ratings alongside hygiene scores.
Launched to coincide with Food Safety Week, the collaboration means that diners visiting the Scores on the Doors website can now assess a restaurant's sustainability credentials along with its hygiene performance.
More than 83% of SRA members achieve a four or a five hygiene rating, so there is a correlation between caring for the environment and good working practices.
SRA managing director Mark Linehan said: "The response to recent food scandals, such as horsemeat, demonstrate that diners' demand for responsible business practices is rising. They want clear, simple and transparent information so that they can make quick and informed decisions about where they eat out and Scores on the Doors have been quick to respond to consumer demand. One search now immediately allows diners to seek reassurance on both cleanliness and conscience."
Scores on the Doors carries hygiene rating by Local Authorities which assess the handling of food, the condition of the building, and the measures in place to ensure food is safe. The Local Authorities hand out a zero to five rating, with five being top marks.
These ratings will now be accompanied by a one to three star sustainability score based on society, sourcing and environment on the Scores on the Doors website.
Paul Hiscoe, director of Transparencydata, which operates Scores on the Doors, said: "Diners want to be confident that the restaurants they eat in are clean and hygienic and that's why a quarter of a million people visit the Scores on the Doors website every month.
"We know that where food comes from and how it is produced really matters to an increasing number of diners too, so this is a natural progression for us and we are delighted to partner with the SRA to make it easy for diners to find sustainable restaurants."