Basement Backwater Valve Installation in Markham

- Basement Waterproofing Markham is knowledgeable and always ready to fix any wet basement issues you might have. The average cost of backwater valve installation in Markham homes ranges between $200 and $500. This cost varies based on several factors which include the location of the valve, the type of materials that must be worked with for proper installation, the number of valves required for the coverage that is sought, as well as any additional materials and labor costs that are associated with the work.