Posted: 14/01/2015 at 14:36
How much privacy do you want? you could do quite a good job by adding Trellis to the existing fence with its own supports then grow climbing plants up it, a mix of plants would give you privacy in the months you would sit out which with luck would be six months of the year. You would not need to lift it much to stop people peering over the fence, if you were sitting or laying down you would be out of the eye line. Take a batten or some cardboard out of the garden and raise it until you get a level when seated you are not in sight.
Anything you do will not be cheap, hedging needs maintenance, the higher the fencing the more prone to blowing down in a wind, once saw fifty feet of new fencing just disintegrate in a gust of wind whilst walking the dog. It needs thinking about and at what cost do you put privacy. Two sides of my garden are four foot board fences as we talk to the neighbours, the north side a six foot fence to keep the north wind out and the front open plan, I can sit in the sun and cogitate with only a couple of neighbours to see me if they wish to. Depends really on what you can afford, brick walls are definitely the best way.