There are four types of parking spaces on campus. The standard spaces do not require a permit and can be parked in for free as we are outside of the academic term. If there are no standard spaces available, then there are visitor spaces which are also free outside of the academic term. The car park by the bank has several of these visitor spots. There are also premium visitor spots (marked yellow) for €5/hr. The last category are spaces for gym members - these are blue and cannot be used by non-members.
A list of car parks, along with much more detail on parking can be found on the UCD Estates parking page.