What are the disadvantages of a polytunnel?
Pro: Greenhouses constructed with toughened glass are incredibly durable and can last a lifetime without the need for structural replacement. Con: The polythene cover of a polytunnel needs regular replacement every few years, which can add to the long-term costs and effort. If it is maintained and constructed with quality materials, a polytunnel can last between 15 – 20 years before the frame, or at least parts of the frame, need replacing. The polythene sheet of a polytunnel will need to be replaced every 7 – 10 years.