Hundreds of singers entered the competition from cathedrals and churches across the county. Eight finalists (four boys and four girls) were chosen to perform in front of a panel of celebrity judges at All Soul's Church, Langham Place, London.
The judges included the composer John Rutter, tenor Jon Christos, Blue Peter presenter Liz Barker and singer Tony Christie.
Laura, aged 15, was the first to sing on the night. She performed 'My Song is Love Unknown' and Faure's 'Pie Jesu'.
Laura said: "I can't believe I won. I'm ever so excited. I didn't believe I had a chance of reaching the final, let along winning it!
"The atmosphere was really tense, especially when the winners were being announced."
The competition was broadcast on BBC Radio 2 on Sunday evening and was compered by TV presenter and composer Howard Goodall.
Robert Goodrich, Director of Framlingham College commented: "This is a fantastic achievement for Laura, which she thoroughly deserves. It follows the success of fellow pupil, Christina Johnston, who managed to reach the final in last year's competition.
"Laura now has the opportunity to appear on BBC Radio 2's Good Morning Sunday and Sunday Half Hour, Radio 4's Daily Service, as well as a TV appearance on BBC One's Songs of Praise. My congratulations go to Laura. She has a beautiful voice and sings with such clarity and passion."
Laura was presented with a trophy, a £500 personal prize and £1,000 for her choir.