Internal Elevations are drawings that depict the features of a wall from the front. Typically, each room would include four interior elevations illustrating each wall and what you can see on that wall while facing it. The term "interior elevation" refers to a drawing that shows a view of one side of a room. The American Institute of Architects (AIA) publishes a series of books called Guidelines for Designing Older Neighborhoods which includes a chapter on how to use interior elevations to illustrate the features of a home. This book is available for free online at www.aia.org/publications/books/olderneighborhoods. You can also download a PDF copy here: http://www.aia.org/Publications/Books/olderneighborhoods/chapter6internal.pdf In addition to showing what's behind walls, interior elevations are useful for depicting other aspects of a house such as rooms or levels. They can also help show relationships between spaces by comparing two adjacent walls. Finally, they can reveal problems with a house such as structural issues or inadequate insulation. An interior elevation should be done for every floor-to-ceiling plan in a house. If there are partial-height walls, only draw the full height of those walls on the interior elevation.