There are several factors to consider when computing for the cost of a pipe insulation in Washington project. These factors that can affect the cost usually include the pipe location, type of pipe, number of pipes to insulate, and the materials needed. It has been stated that the majority of homeowners spend around $90 up to $300 with an average of $170 for a Washington pipe insulation project. A single-family home can cost around $170 to $190 to be insulated. However, this amount may change if extra work is needed to gain access to the pipes. If you are living in an apartment, its piping system is usually designed to allow easier maintenance. This can cost you around $130 to $150. If you are planning to insulate around 3 to 5 pipes in your home, it can cost you around $150 and around $220 to $370 for 6 to more than 15 pipes.