These costs are an average and each job is unique, Sometimes the cost will be lower or higher. If you want to find out exactly how much it will cost you to Install a main line backwater valve (BWV) or to fix your basement leaks then contact us, Backwater valves and Basement Waterproofing should be left to the professionals so let Canada Waterproofers do your job so you know its done right! - Interior Backwater Valve installation $1600 – $2600 - Exterior Backwater valve Installation $2400 – $4200 - Cost of Backwater valve permits $198.54
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