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This post was edited by nico6196 on Mon, Apr 15, 13 at 9:30

Its not advisable to plant more trees in between. Trees require a large amount of water and their roots would have by now taken up the space between the trees. So in fact the previous owner did something right for those plants. you will eventually have very tall and large trees there. A huge mistake I've seen is when trees are planted closer than 3 feet between. It will overcrowd and eventually one dies. It then becomes harder to remove and to replace. These trees are still relatively young. I would say it's been in the ground for 2 or 3 years. It will eventually fill in.

But I hear you. You feel exposed. There's not fence to create that privacy. An alternative is to add a second row of trees but placing them offset. This way the new row of trees would have the space to grow roots in. It may be the same kinds of trees or you can use other evergreens like hollies or even different types of shrubs. Personally I like variety (see mosaic hedging) Of course, this solution would mean a bit more of your yard space is taken up but it's the only reasonable solution that I can see.

I agree. I would plant another row but offset them. I think the same kind would be good but that is just my personal taste.