Get an INSTANT, detailed estimate of the cost to Repair a Subfloor! Our free calculator uses up-to-date, trusted data to estimate typical subcontractor costs for a Subfloor Repair project. For a basic 120 square feet project in zip code 47474, the benchmark cost to Repair a Subfloor ranges between $36.14 - $55.20 per square foot* . To estimate costs for your project: