Stewardship End Result Contracting Improvement Act of 2017 This bill amends the Healthy Forests Restoration Act of 2003 to authorize the Forest Service and the Bureau of Land Management (BLM) to obligate funds to cover any potential cancellation or termination costs (cancellation ceiling) in stages that are economically or programmatically viable with respect to an agreement or contract for a stewardship end result contracting project. The Forest Service and BLM shall submit written notice to Congress and the Office of Management and Budget 30 days before entering into a multiyear agreement or contract that includes a cancellation ceiling exceeding $25 million if proposed funding for the costs of cancelling the agreement or contract up to the ceiling is not included. If the offset value of the forest products to be removed exceeds the value of the resource improvement treatments, the Forest Service and BLM may: (1) use the excess to satisfy any outstanding liabilities for cancelled agreements or contracts; or (2) if there are no such outstanding liabilities, apply the excess to other authorized stewardship projects.