evergreen shrub or tree needed to screen something ugly .

Quick growing to seven feet and then stops? The impossible dream. How wide would this tree/shrub have to be? And what growing conditions?
First stab - a mahonia

One of the Pyracanthas? Evergreen, lovely blossom and bright berries in the autumn. Downside - they are prickly!

Viburnum Burkwoodii. Golden Privet. Buddleia globosa I imagine you are prepared to cut it back once high enough, for this is a real big fella, but soft wood that is easy to trim or break into shape.