It is all based on the model’s hinge and how the bins will pull out etc. Some brands are as little as 3″ while most are 12″ minimum to open door 120 degrees. In many of the units, I sell a 5″ filler is put in place, but you really need to look at the specific model because a brand like Fisher Paykel has an inset hinge, so they are like 2″ when a brand like Bosch has a thick door and asks for 6″. So if you have a model in mind, I can definitely look further! Every brand has in the spec guide a dimension to open it clean and another dimension to open it with bin removal.