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$18.56. Get an INSTANT estimate of the cost to Dig a Trench! Our free calculator uses recent, trusted data to estimate costs for your Trenching project. For a basic 25 feet project in zip code 47474, the benchmark cost to Dig a Trench ranges between $10.41 - $18.56 per linear foot.To estimate costs for your project:1.or a basic 25 feet project in zip code 47474, the benchmark cost to Dig a Trench ranges between $10.41 - $18.56 per linear foot. To estimate costs for your project: 1.
1 If another process other than a blasting method is used, the costs per cubic yard can more than double. 2  Based on the discussion at eng-tips.com, the average cost of rock excavation is around $5 to $15 per cubic yard if the contractor is able to drill and complete the blast. Louisvilleky.gov received bids from five different contractors, whose rock excavation services were priced anywhere from $60 per cubic yard by blasting, to as much as $125 per cubic yard by mechanical means.