Cast iron guttering remains a preferred choice for heritage and listed buildings due to its durability, historical accuracy, and ability to preserve traditional character. Organisations such as Historic England, Historic Environment Scotland, and Northern Ireland's Department for Communities note that, with proper maintenance, cast iron can last significantly longer than modern alternatives.
In contrast, materials like uPVC are generally discouraged for historic properties due to aesthetic concerns, susceptibility to damage, and shorter lifespans. Additionally, while the production of cast iron has an environmental impact, its long service life and 100% recyclability make it a more sustainable option over time compared to short-lived plastic alternatives.