The third generation Mini (known under the internal codes F55 and F56), unlike the previous ones, has two body types. The first is a three-door (F56) that has an exterior length of 3.82 meters and a wheelbase of 2.49 meters. The second is a five-door (F55) that reaches an exterior size of 3.98 meters and a wheelbase of 2.56 meters.

In both bodies the width remains at 1.72 meters, the height being 1.41 meters in the 3-door version and 1.42 meters in the 5-access version.

The habitability of the English model is not one of the widest in its segment, since the 3-door version is homologated for 4 occupants and the bodywork has 5 accesses for 5 passengers. However, only in the wider body will they be able to go somewhat more comfortable. All in all, the capacity of its boot ranges from 211 liters for the smallest to 280 liters for the largest.