Flat roof or pitched roof dormers can be used
to increase available height in part of the attic
area. This increase may then facilitate better
access or usage.
Sometimes minor changes to roof design can dramatically
improve potential e.g. Raising ridge lines, forming
split level section(s), changing roof pitches,
forming mansard roofs etc. More radical approaches
may sometimes be involved for which the benefits
sometimes greatly outweigh the costs.