Your Path to Building your own Hobby Greenhouse Step 1. Select one of our three models below The Biltmore is a 14 x 14 hobby greenhouse that can be expanded up to 50 ft long. START The Beaufort is our most popular Lean-to Model and can be expanded up to 30 ft long. START The Brightleaf is a 8 x 10 budget priced starter greenhouse that is expandable up to 26 ft long. START