HomeGuide's 2026 national rate for trenching is $5 to $12 a linear foot, or $500 to $1,200 for 100 feet. In Minneapolis, most trenches are frost-deep and many run to the alley or the street.
All dollar amounts here are national ranges from HomeGuide, never our own prices for a Twin Cities job. Frost, glacial clay or sand, groundwater near the lakes, alley access and haul distance all move the real cost. The HomeGuide pages were checked in October 2026.
What does a 100-foot trench cost in the Twin Cities, and what drives trenching cost?
A 100-foot trench costs $500 to $1,200 at HomeGuide's $5 to $12 a foot, of which about $2 to $3 is the machine and $3 to $9 the labor. Labor for trenching alone is $35 to $65 an hour on HomeGuide's page. Frost depth, sand that needs shoring and right-of-way restoration in the street drive the trenching cost here.
| Trench length | HomeGuide national range |
|---|---|
| 50 ft | $250 to $600 |
| 100 ft | $500 to $1,200 |
| 200 ft | $1,000 to $2,400 |
Who do I call to replace an old or lead water line in Minneapolis, and what does it cost?
To replace an old or lead water line, call a licensed plumber, who brings in an excavator or digs with their own machine, and ask your city whether a lead service replacement program applies. HomeGuide puts main water line replacement at $2,000 to $5,000, around a $3,500 average, or $50 to $200 a foot trenched and $70 to $250 trenchless.
How deep must a water line be buried in Minnesota so it does not freeze?
A water line in Minnesota must be buried below frost, at the depth your plumbing code and water utility set, and that is well deeper than the 42-inch footing rule in many cases. The plumber confirms the number before we dig. Lines under driveways and shoveled walks freeze first, because snow cover insulates the ground everywhere else.
What does it cost to dig up and replace a clay sewer lateral?
Replacing a clay sewer lateral costs $50 to $250 a foot, or $2,000 to $10,000 for 40 feet, on HomeGuide's sewer page; bursting the old pipe costs $60 to $200 a foot and lining it $90 to $250. A camera inspection at $125 to $500 tells you which approach fits. Old clay laterals full of roots are the most common trench we dig in Minneapolis.
What does it cost to trench an electrical line to a detached garage?
Trenching an electrical line to a detached garage costs the same $5 to $12 a foot as other trenching in HomeGuide's figures. A licensed electrician installs the conduit or cable and sets the depth, and the trench usually waits open for the inspector.
What does it cost to run a gas line or propane line underground in Minnesota?
An underground gas line costs $12 to $25 a foot, or $350 to $1,000 or more, by HomeGuide's trenching page. A licensed gas fitter or plumber installs and tests it. Propane is rare in the cities but common on rural parcels, where the supplier sets tank placement rules.
Can you bore under a driveway, sidewalk or boulevard tree?
Yes, boring under a driveway, sidewalk or boulevard tree avoids an open cut. Directional boring is $10 to $30 a foot, or $1,000 to $9,000 for a typical job, by HomeGuide, with 100 feet at $1,000 to $3,000. It costs more per foot but saves concrete and roots.
Can the water service and sewer lateral go in the same trench?
The water service and sewer lateral can share the same trench only when the plumbing code's separation between them is met. The plumber decides that layout. When they can share, one frost-deep trench is cheaper than two.
Can you trench close to my house or near big tree roots?
Yes, trenching close to a house or near big tree roots is done with extra care: near the house we stay clear of the footing and backfill the same day, and near large oaks and elms we route around the root zone or bore beneath it. Boulevard trees belong to the city, which may have its own rules for digging near them.
Need a real price for your Twin Cities property? Call or text (612) 688-4650; we walk the site first and then send the scope and price in writing.