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Turrets and other structures should expand the influence area and let other structures to be placed nearby #16542
For the default RA mod it is a design decision that structures from the defence tab generally do not give buildable area. This is part of a concept to limit basecreep and make building placement and expanding a more important and interesting part of the game.
Usually, people use cheap structures like powerplants to "basewalk" toward a certain area, or the buildings in their buildorder. That this does not always work in narrow areas is a limitation that can not be fixed without introducing disruptive changes. You can however change this very easily in a custom mod(map).