In Thornton, the cost to replace a backflow valve generally runs from $300 to $1,500, but several key factors can push the price up or down. For residences, the price tends to center around $500 and can go up to $1,000; however, in commercial contexts, the price tends to start higher and can go up to around $2,500. The valve size, installation complexity, system accessibility, and need for additional plumbing can cause the price to rise. On the other hand, if those things don't necessitate a higher price tag, then pressure from local permits and the cost of labor in Thornton are potential downward press factors on installation costs.If you own a home and need to replace a standard residential backflow valve, you can anticipate paying around $750 on average. The price could go significantly higher for commercial properties, which often have more complex back plumbing systems that require more sophisticated backflow prevention devices. If you get a quote, it is smart to get at least two or three from certified local plumbing contractors who are authorized to work in Thornton and understand your home's plumbing system. Unsolicited estimates tend to be lower, so don't shy away from asking your chosen contractor to explain why their quote is what it is.