Once client approval is made of the design, a deposit of 50% is required for placement on the work schedule, with 25% due midway through the project and a balance due upon completion. Add-on's and changes are billed accordingly. Weather may have an impact on the installation process. Your dry stone project is built according to standards set forth by the Stone Trust and the Dry Stone Walling Association of Great Britain, and will provide you many years of enjoyment.