The bakery, which launched the free-from range earlier this year, invested in a new production facility at Farrington Gurney, specifically for the Batch#5 range, to avoid contamination.
The symbol is internationally recognised, and is awarded by Coeliac UK after independent certification.
Mark Slevin, Bath Bakery’s managing director, said: “I'm a firm believer that if something’s worth doing then it’s worth doing right.
“When we looked at introducing a gluten-free range of goods it was clear that just using gluten-free ingredients wasn’t enough and, from scratch, we had to create an environment free from any possible risk of gluten contamination.
“People who want a wheat-free lifestyle, who have wheat or gluten intolerance or are coeliac sufferers are sometimes a little suspicious of products produced in a bakery.
“That’s why we opened an entirely new production facility which is completely gluten-free with all risk of contamination eliminated.”
He added: “Even the bakers’ sandwiches for lunch have to be zero gluten!”
Bath Bakery employs more than 100 people in its 12 shops located in and around the city of Bath.