Tongue & Groove Storage. Gardening Supplies. 7x5 Plastic Shed Base Kit - £92.99 This plastic shed base kit is suitable for sheds that measure 7x5, creating a stable base for your shed to sit on. Saved from margin-top: 5px; Its interlocking design makes it easy to put together and, though lightweight, it provides a very strong and durable base for the shed. Free delivery. ProBase plastic grids, QuickJack adjustable height bases, and EasyPad foundation pads for garden buildings and commercial spaces. We recommend using 15kg of 10mm pea gravel per square. Our website makes the job far easier than it would otherwise be. However, if you feel comfortable with the task, then it is relatively straightforward to construct your own base. Add to Basket Quick View View details . Skip to the beginning of the images gallery, Easy installation on any reasonable level garden surface,,,