What is the cost in 2026 for building in St Helens?

In St Helens, the cost of building services such as house extensions, loft conversions, and garage conversions varies significantly based on the specifics of the project. For a house extension, you can expect to pay between £1,500 and £2,500 per square metre in 2026, with an average extension costing around £15,000 to £30,000. Loft conversions typically range from £20,000 to £50,000, depending on the complexity and whether you need to build dormers. Meanwhile, garage conversions might cost anywhere from £8,000 to £20,000. It’s important to note that these prices may be influenced by factors such as local labour rates and materials. Additionally, ensure that the builders you hire are certified, such as being NICEIC registered for electrical work or Gas Safe registered for plumbing, to guarantee quality and safety. Always check for local planning permissions as well. Looking for professionals in your area? Find vetted providers on TradeMatch.