If you think that your house needs more living area, you don't necessarily have to consider the expense and hassle of an addition. Habitable space might already exist above or below your current living areas in the basement or attic of your home. Architect Jerri Holan outlines the things to keep in mind if you want to transform an attic or basement into a functional space. Holan considers not just design aspects of transforming an attic or basement space into a room but also code and structural issues. Basements, for instance, may need to correct moisture issues before they can be habitable; attics may require reinforced floor and roof framing.