![]() ![]() In addition to utilities, pros dig trenches to construct retaining walls. Trenches, usually deeper than they are wide, play a big part in the construction and maintenance of infrastructure. Gas line, using 1-inch polyethylene pipe, adds $0.66 per foot. The average price per foot of sewer line ranges from $50 to $250. Copper, the most common material for water lines, can add between $10 and $20 per foot. Conduit, using half-inch non-metallic PVC pipe, adds about $0.25 per foot. Professionals use trenches to place utilities underground, install lawn sprinklers, or devise a drainage system on your property. ![]() The cost per linear foot ranges between $4 and $12. Smaller projects can run as little as $400, while more expensive ones are about $1,200. The average cost to dig 100 linear feet of trench is $800. Find hiring guides, material costs, expert advice, how-to's and more. ![]()
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