You should send artwork to us as standard dimensions, plus 3mm bleed – on each side.
So you add 6mm in total to each document dimension. So A4, which is 210 x 297mm, will be produced at 216 x 303mm and trimmed down.
If you want to know more about the concept of bleed, click here.
If you are supplying multipage documents, supply them as individual pages, all with bleed on every side. We will deal with the spine, creep and pagination issues for you.