Enclosing parking space & blocking other users.

We have a new owner in our block who wants to enclose his undercover car space.

The parking spaces are under an elevated section of the building – not a basement and were never designed to be enclosed.  There are a few sections of differing sizes, this particular area is built to house two cars – total width 4 metres 88 centimetres.

If this owner puts up a dividing wall down the centre of this area it will make use of the adjoining car space extremely difficult – reducing the useable width to 2.44 metres. While we park within the marked lines, it is accepted by all other owners that to give reasonable access, car doors are opened into the adjoining area.     

This owner says it his space and he can enclose it if he wants too.  My opinion is that the area was never designed to be enclosed – it is a parking space only, not a lock up garage and enclosing it will adversely affect the adjoining owner’s ability to utilise his designated parking space – both in driving into the space and entering/exiting a car.  

The car currently parked there is a mid sized car, 1.8 m wide. This leaves .64 of a metre total or approx 30+ centimetres either side. If the driver can reverse in and leave just 20 centimetres on the passenger side (not easy) that will give him 40 centimetres to open his door against a concrete wall.  I believe this is unreasonable.

Any thoughts on how to stop this?