Underground Utility Services
Underground utility installation and site work for residential, commercial and municipal projects throughout Vermont and New Hampshire.
Request a Quote →Utility Connection, Repair & Replacement
From new construction to repairs and replacement, Thompson Site Services handles underground utility excavation for residential and commercial properties throughout the Upper Valley.
Fiber Optic & Phone
Trenching and excavation for underground communications, fiber optic and phone service connections.
Sewer Lines
Excavation for new sewer connections, repairs and replacement of existing underground lines.
Water Lines
Water service excavation, repairs and replacement for residential and commercial properties.
Electrical Conduit
Trenching and site preparation for underground electrical conduit and service connections.
Propane Gas Lines
Excavation and trenching for underground propane service lines and related site work.
Underground utility installation and repair for properties throughout Woodstock, Quechee, Windsor, and West Lebanon. Whether it's a new fiber line, a sewer connection, or an electrical conduit run, Thompson Site Services handles the trenching and excavation work carefully, with attention to existing site conditions and utilities already in the ground.
Understanding Utility Work
Underground utility work covers installing, repairing, or replacing the water, sewer, electrical, and fiber lines that run beneath a property. It's often invisible until something goes wrong, whether that's a leaking water line, a sewer backup, or a homeowner finally ready to bring high-speed internet to a rural property.
Depth and placement matter more here than in warmer climates. Most water and sewer lines need to sit well below the frost line, which typically runs 48 to 60 inches in this region, to avoid freezing during the winter. Before any trenching begins, we call Dig Safe (811) to locate and mark existing lines, and we coordinate directly with utility providers or the town when a project requires it.
How We Get It Done
Locate & Mark
We call Dig Safe (811) to identify existing utility lines before any digging begins.
Plan the Route
We map the most efficient path for the new or repaired line based on your property and existing infrastructure.
Trench & Install
We excavate to the required depth and install water, sewer, electrical or fiber lines to code.
Connect & Test
Lines are connected and tested to confirm proper function before backfilling.
Backfill & Restore
We backfill the trench, compact the soil and restore the surface to its original condition.
When to Call Us
- Water or sewer line is aging, leaking, or frequently backing up
- Adding a new building, garage, or addition that needs water, sewer or power
- Upgrading from a well or septic system to municipal service where available
- Bringing fiber or high-speed internet service to a rural property
- Digging up your yard is the only way to find out why a line has failed
Frequently Asked Questions
How deep do utility lines need to be buried in Vermont and New Hampshire?
Depth requirements vary by utility type and local code, but most water and sewer lines need to sit well below the frost line, which typically runs 48 to 60 inches in this region, to avoid freezing.
Can you repair a single section of a line instead of replacing the whole thing?
Often, yes. If the rest of the line is in good condition, we can excavate and repair just the damaged section rather than replacing the entire run.
Do you coordinate with the utility company or town?
Yes. We work directly with utility providers and town officials when a project requires coordination, inspection or a tie-in to municipal service.
How long is my yard disturbed during a utility installation?
Most residential utility trenching and backfilling is completed within a day or two, though we'll always give you a realistic timeline based on your specific project.
Built Around the Work Underground.
Careful Excavation
Precise trenching and excavation designed around existing utilities, structures and site conditions.
New & Existing Sites
Utility work for new construction, service upgrades, repairs and replacement projects.
Multiple Utilities
Excavation support for water, sewer, communications, electrical conduit and propane service lines.
Local Experience
Experience working with Upper Valley properties, terrain and the challenges of underground site work.
Our Team on the Job
Ready to Start Your Project?
Please complete the form below with as much detail as possible. A member of our team will contact you once we have a chance to review your project. The more details, the more accurate the information we can provide will be. Thank you for your interest in working together and we look forward to working together soon! -The TSS Team