Built-up Area – As it relates the the Transport Canada UAV SFOC process, are considered areas with groups of buildings or dwellings including anything from small hamlets to major cities. Anything larger than a farmstead should be considered a built up area.

As defined in Advisory Circular (AC) No. 600-004

For reference: Farmstead – the buildings and adjacent service areas of a farm.
http://www.merriam-webster.com/dictionary/farmstead