The most common tree height is 7.5 feet, as measured from the floor to the top of the tree. Trees 9' or taller are popular in rooms with high ceilings, and 6.5' trees are popular for smaller rooms. 4'-5' trees are popular for table-top locations.
The standard tree shape is "full"; trees for smaller spaces are called "narrow" or "slim." We suggest you consider the tree diameter to help you pick the perfect tree. This measurement is taken at the very widest point of the tree, so if you don't mind a few tree tips touching a wall or a piece of furniture, the true space occupied by the tree will be 6"-8" less than the reported diameter. The other key is to make sure the tree is a natural shape. If it is "pencil-shaped," it probably doesn't look like a real tree. If you are looking for a space-saving tree, we recommend a tree like the Manhattan Flatback Tree, which is designed to look like a full tree while taking up half the space.