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Most hedging plants will grow that high eventually...you just have to buy bigger plants...costing more. Only advice I would give is that if there is a window overlooking it, which is used for a view, eg kitchen/, living room/ conservatory, go for something with a relatively small leaf as it is so close. A laurel for example will be aesthetically displeasing that close up.
Leylandii (yuck) might be fastest solution, horrible things, but if looked after from the start and annually will do the job.
How about black or golden-stemmed Bamboo (Phyllostachytus nigra or aurea) which are clump forming as opposed to 'running' Bamboo but as even these clump forming Bamboo get mature you do get occasional runners.
Not sure if it's a suitable option but may be worth growing in a very large container if soil depth / drains is a problem and this would add an instant extra few feet in height.
another option is a fence/trellis with a clematis,honeysuckle etc