Posted: 24/09/2015 at 10:24
Where are you? If in a residential area there are rules about fence and hedge heights and 2m is the norm.
However, if there are no such restrictions, I think you can do a lot better than a wall of conifers which would be desperately dull, very wide at the base and suck all the goodness out of the surrounding soil plus not being good wildlife habitat.
Think instead of a mix of plants such as holly - one male and one female so you get berries or two self fertile to improve berrying - hawthorn, sorbus (rowan), prunus padus (bird cherry), amelanchier, elderflower, euonymous europa and so on to give variation of form, structure, foliage colour and also shelter and food for wildlife.