If you cannot prepare your own solid level base why not take advantage of our base laying service -prices include sand cement and flag stones but not removal of rubbish -you can add this option as you orderIf the area where your shed is to be installed is solid but not level or uneven you may require a sub frame which will provide a level platform onto which the shed can be erected- The subframe product can be seen on the downloadable brochure and can be added to your order via our sales office on 0151 546 7378