Natural slate is typically the most expensive type of slate because it is the most durable and long-lasting option available. Natural slate is made from thin shingles of natural metamorphic stone, which are incredibly dense and heavy. The production process for natural slate is also more time-consuming and requires specialised skills and equipment. This makes the cost of natural slate higher compared to other types of slate. However, despite the higher cost, natural slate is an attractive option for many homeowners due to its exceptional durability, resistance to mould and fading, as well as its eco-friendly properties.