While there is no minimum recommended size for carports, the design you opt for obviously needs to be fit for purpose.
“Typically I would recommend each bay to be 3m wide by 5.5-6m in depth," says Zoe Grey, a regional design consultant for garages and outbuildings at Oakwrights. "If you would like EV charging in the bay, 6m depth is essential. This will allow for the charging on the back of the bay and a large 4x4 vehicle."