It takes its name from the shape of the letter L. Ells are often additions to an existing building which make it L-shaped in plan. In connected farm architecture, the ell is often extended to attach the main house to another building, usually a barn.
- Ching, Francis D. K. (1995). A Visual Dictionary of Architecture. Van Nostrand Reinhold Company. p. 26. ISBN 0-442-02462-2.
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