The answer to 'how much is backflow preventer' is that the cost of a backflow preventer can vary widely depending on several factors. Backflow preventers are an essential plumbing component that help protect your home's water supply from contamination, but the price can range from a few hundred dollars to over a thousand dollars, depending on the type, size, and complexity of the installation.
Some of the key factors that influence the cost of a backflow preventer include the size and type of device needed (e.g. reduced pressure zone, double check valve, or atmospheric vacuum breaker), the complexity of the installation (whether it requires additional piping or modifications), and your location and the local labor rates. Additionally, the cost may be higher if the backflow preventer needs to be installed in a difficult-to-access area or if it requires specialized permits or inspections.