For nearly maintenance-free storage units, vinyl is the preferred siding. Vinyl lacks the visual appeal of wood, but if you own a house with vinyl siding, why not select a storage unit that is also sided with vinyl? However, vinyl will get dirty over time, making it even less attractive. Mold is often the culprit. Take into account the maintenance required to clean the vinyl periodically.
Outdoor benches are sometimes made to be dual-purpose, offering a compartment to store tools and a cozy spot for taking breathers while mowing the lawn. Potting sheds and small greenhouses are a boon to the true landscaping enthusiast. Some outdoor storage buildings come with large skylights and virtually function as greenhouses in their own right.