The biggest advantage of the Motte and Bailey design was how extremely cheap and easy to build it was. Designers could use an existing mound or hill for foundations which could save significant construction time.

The primary advantage of a Motte-and-Bailey castle was its speed and ease of construction. Following the Norman Conquest of 1066, William the Conqueror needed to establish control over hostile English territory quickly. These castles could be built in just weeks or months using readily available earth and timber, rather than the years required for stone masonry. The "Motte" (a massive man-made mound) provided an immediate strategic height advantage, allowing defenders to spot attackers from miles away and making the central keep difficult to storm. The "Bailey" (an enclosed courtyard) provided a protected area for soldiers, horses, and food storage. While wood was vulnerable to fire, the sheer speed of construction allowed the Normans to assert dominance across England with hundreds of these fortifications, many of which were later "upgraded" to the stone castles we recognize today.