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Minimum base sizes
21ft wide Greenhouse
We recommend that your base should be no smaller than the minimum base size listed below and no more than a few inches larger.
The first dimension listed is the external width (A) and the second dimension is the external length (B). The width refers to the angled gable wall.
21'9" x 6'7" GREENHOUSE = minimum base size 6628mm wide x 2012mm long
21'9" x 8'8" GREENHOUSE = minimum base size 6628mm wide x 2632mm long
21'9" x 10'8" GREENHOUSE = minimum base size 6628mm wide x 3252mm long
21'9" x 12'8" GREENHOUSE = minimum base size 6628mm wide x 3872mm long
21'9" x 14'9" GREENHOUSE = minimum base size 6628mm wide x 4492mm long
21'9" x 16'9" GREENHOUSE = minimum base size 6628mm wide x 5112mm long
21'9" x 18'10" GREENHOUSE = minimum base size 6628mm wide x 5732mm long
21'9" x 20'10" GREENHOUSE = minimum base size 6628mm wide x 6352mm long
21'9" x 22'10" GREENHOUSE = minimum base size 6628mm wide x 6972mm long
21'9" x 24'11" GREENHOUSE = minimum base size 6628mm wide x 7592mm long
21'9" x 26'11" GREENHOUSE = minimum base size 6628mm wide x 8212mm long
21'9" x 29'0" GREENHOUSE = minimum base size 6628mm wide x 8832mm long
21'9" x 31'0" GREENHOUSE = minimum base size 6628mm wide x 9452mm long
21'9" x 33'1" GREENHOUSE = minimum base size 6628mm wide x 10072mm long