The cost of hiring roof snow removal services in Washington can be affected by a lot of factors. The type of roofing that you have, whether it is flat or pitched, is one of the factors that professionals will consider. Every type of roof requires a different kind of removal process. Also, professionals will also assess the slope of your roof. Steeper roofs cost greater because they are more dangerous to work on. If the snow on your roof looks hard as ice, it will also need a more extensive process and this can affect your total expense. Another determinant is the size of your roof. Charges may also rely on the type of treatment method that will be used for the service. Some may cost more and some may cost less.