The 15” x 15” (48 dot x 48 dot / 38cm x 38cm) LEGO baseplates are the largest baseplates produced by LEGO today.
In the 1960s and 1970s, LEGO produced slightly larger baseplates (50 dots x 50 dots) but these were discontinued when the company began producing baseplates which are almost exclusively in multiples of 8 dots, this allows manufacturing costs to be kept down.
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The first 15” x 15” brick building baseplate is the brick building 843 Grey Baseplate which was released as part of the Basic Supplementary Set in 1980. This baseplate is the same as the brick building 1085 Large Baseplate 48×48 released in 1985, the brick building 815 Baseplate, Grey released in 1986 and the brick building 628 X-Large Grey Baseplate released in 1996.
15” x 15” brick building baseplates come in green, grey, white, blue and yellow.
Yes! We sell the brick building 10701 Grey Baseplate: a 15” x 15 baseplate released as part of the Classic Set on January 1st, 2015. We also sell our own grey baseplates 15” x 15” as part of a 5 pack and individually.