Trenching
Trenching Contractor: Water, Sewer, Electric & Gas Lines
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Fast, easy, no obligation. Firm written price after a site walk.
Princeton Excavation is a trenching contractor for water service lines, sewer laterals, electrical conduit, and gas runs, including gas lines for standby generators, in the Princeton area. We call in the NJ One Call markout, cut a clean trench to the depth your plans or code call for, and close it in compacted lifts. Your licensed plumber or electrician makes the connection; we handle the ground.
How the trench goes in
A trench is easy to dig badly. Ours are straight, safe, and closed up so you never know they were there.
Cut to Depth and Grade
Water lines go below the NJ frost line, around 36 inches. Sewer laterals need steady fall. We hold depth and slope with laser grade control so the pipe lays right the first time.
Bedded and Backfilled Right
Bedding sand under the pipe, hand-placed pipe zone backfill over it, warning tape where the utility calls for it, then backfill compacted in lifts so the lawn doesn't sink into a stripe next spring.
Marked Out and Shored
NJ One Call 811 markout before every dig, no exceptions. Where depth requires it, we use a trench box or bench the walls so the trench is safe for the trade working in it.
A trench, not a war zone
Most trenches get dug with a backhoe that tears a truck-wide path across the yard. We run a mini excavator with a narrow bucket instead, so a conduit run to a detached garage, EV charger, generator pad, or pool equipment leaves one clean line, not a construction site. Spoil goes on protection boards, topsoil stays separate, and the trench closes the same way it opened.
Where we work
We work for homeowners and for the trades directly. Electricians and plumbers bring us in because we open on schedule, hold their spec, and don't leave a trench sitting open waiting on anybody. If you have a trade lined up, we'll coordinate the timing with them ourselves.
What trenching costs per foot
Typical New Jersey ranges, for budgeting only: about $5 to $25 per linear foot for residential trenching in open ground. A shallow conduit run through a lawn sits at the low end; a water service below the 36-inch frost line, or any run that crosses a driveway or walk, sits at the high end, and cutting and patching asphalt or concrete roughly doubles the per-foot cost.
Length, depth, soil, and surface restoration set the price, along with how much hand digging the utility markout forces near existing lines. Tell us what's going in the ground and where it runs. We'll walk it, flag the complications up front, and put one firm number on paper.
How a job goes
From the first call to a clean handover
Site Walk
We come look at the property by appointment, check the access and any constraints, and go over your plans or what you have in mind.
Marking & Layout
We set the layout on the ground with laser accuracy. Depths, lines, and elevations are marked before anything gets dug.
The Work
We bring the right machine for the access, lay ground protection where it's needed, and keep the mess around lawns, trees, and hardscape to a minimum.
Clean Handover
You're left with a site that's ready to go and a yard that's still in one piece, set up for whatever's next.
Frequently Asked Questions
No. Regulated connections belong to your licensed plumber, gas fitter, or electrician. We open the trench, bed it, and backfill after their work is inspected. That split is normal on these jobs, and we time the dig with your trade so the trench is open as briefly as possible.
Whatever the job requires. Water services run below the frost line, about 36 inches in New Jersey. Sewer laterals are set by the fall on your plumber's plan. Electrical depth comes from code and your electrician's spec. We cut to the number, not to a guess.
A narrow, compacted line, not a scar. We keep topsoil separate from trench spoil, backfill in compacted lifts so the line doesn't settle, and rake the surface back out. On finished lawns we lay ground protection along the machine path too.
As a New Jersey market range, not a quote: residential trenching in open ground commonly runs $5 to $25 per linear foot. Cutting through asphalt or concrete roughly doubles the per-foot price, and deeper water-line trenches below the frost line sit at the top of the range. We walk the run and give you one firm number.
Yes. We dig from the meter or tank to the generator pad at the depth your installer or plumber specifies and backfill after the line is inspected. The gas piping and connection stay with your licensed plumber or generator installer.
Yes, whenever the ground can be opened safely. A water service or sewer lateral that fails in January still has to be dug out. The trench is backfilled and compacted the same way, with final topsoil and seed in spring.
Service Areas
- PrincetonMercer County
- Hopewell TownshipMercer County
- Montgomery & SkillmanSomerset County
- West WindsorMercer County
- Lawrence TownshipMercer County
- PenningtonMercer County
- RobbinsvilleMercer County
- Hamilton TownshipMercer County
- PlainsboroMiddlesex County
- CranburyMiddlesex County
- South BrunswickMiddlesex County
- HillsboroughSomerset County
- EwingMercer County
Princeton, Hopewell Township, Montgomery & Skillman, and surrounding Mercer and Somerset County, NJ.
Have a trade waiting on a trench? Tell us the run and we'll get it open.
Owner-operated and by appointment. Tell us about your project and we'll walk the site with you.
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