How long the work really takes
Everybody publishes prices. Nobody publishes durations, so here are ours, from our own jobs. The number people are actually afraid of is not the days on site, it is the hours without water, and those are two very different numbers.
From our own jobs in northern New Jersey: a 100 to 200 foot water service replacement takes 1 to 2 days whether trenched or bored, but the water itself is typically off for only hours, about three on a recent job, because the old line keeps working until the tie-in. A sewer lateral runs 2 to 3 days, a spot repair about a day, and a septic system 1 to 2 weeks once the health department inspections are counted.
The table
| Job | Typical time on site | What moves it |
|---|---|---|
| Water service replacement, open trench | 1 to 2 days | What the run crosses. Large poured foundations, driveways, and ground conditions all slow it, and where gas, electric or telecom marks sit near the path, New Jersey's One Call rules require the utility to be exposed by hand before a machine works within two feet of it, so part of the trench gets dug with a shovel. |
| Water service replacement, bored or pulled | 1 to 2 days | The same as open trench, which surprises people. Trenchless saves the surface, not the calendar: setup, the pits at each end, and the tie-ins take the time the trench would have. |
| Sewer lateral replacement | 2 to 3 days | Length and, above all, the depth of the connection at the main. A deep tie-in means a deeper, wider, shored hole for the same length of pipe, and reaching into the street adds the road opening and its restoration. |
| Sewer spot repair (one bad section) | About a day | The Bernardsville root intrusion job is the template: dig it, stay on site while the plumber makes the repair, backfill, compact and restore, one visit. Finding the bad section beforehand with a camera is what makes one day possible. |
| Septic system installation | 1 to 2 weeks | The inspections are the calendar, not the digging. The local health department reviews and physically inspects, and the schedule breathes around those visits. Weather that soaks the ground mid-job stretches it too. |
Our typical ranges on typical sites as of 2026-08-30, not a schedule for yours. Rock, groundwater, access and utility corridors move every one of them, which is what the estimate visit is for.
The outage is not the job
The duration question people actually mean is how long will we be without water, and the answer is far better than the job length suggests. Through most of a service replacement the old line stays connected and the house runs normally while the new path is dug or bored alongside it. The outage is the tie-in at the end: shut down, swap over, restore. On a recent replacement of ours the household was without water for about three hours inside a job that ran days.
That is also why the who-shuts-the-water-off question matters so much on emergencies, where the outage starts before we do. The town-by-town numbers are on who to call to stop the water.
Why trenchless does not save time
It saves the driveway. Boring and pulling carry their own clocks: mobilizing the machine, the entry and exit pits, locating and hand exposing anything marked in the path, and the same two tie-ins every method needs. On a typical service the calendar comes out where the trench would have. Choose the method for what is on top of the line and what condition the old pipe is in, which is the whole subject of pulling, bursting or trenching, and let the schedule be a tie.
Where the calendar goes on a septic job
The machine work inside a septic installation is days. The week or two is the process wrapped around it: the local health department, municipal in some towns and county in others, reviews the design and physically inspects the installation at stages, and the job breathes around those visits. That is not bureaucratic waste, it is the system working, but it belongs in your expectations. The full cost side is on what it costs, and which soils fight a septic field hardest is on septic density in Sussex County.
Questions people ask
How long is the water actually off during a water line replacement?
Hours, not days, and this is the number people are really asking about. The job may run one to two days, but most of that time the old line is still connected and the house still has water. The outage is the tie-in at the end. On a recent service replacement of ours the household was without water for about three hours, on a job that took considerably longer than that overall. Ask your contractor to walk you through the planned outage window before the dig starts, because a good one has thought about it.
How long does it take to replace a water service line in New Jersey?
One to two days for a typical 100 to 200 foot residential service, whether it is open trenched, bored or pulled. What moves it inside that range is what the run has to cross: a large poured foundation, a driveway, hard ground, and any stretch near marked gas, electric or telecom lines, which New Jersey requires to be exposed by hand digging before machinery works within two feet of the mark.
Is trenchless faster than digging a trench?
Usually not, and anyone promising a same-day bore on a full service is selling. Boring or pulling a 100 to 200 foot service takes the same one to two days the trench would, because the machine setup, the entry and exit pits, and the tie-ins consume the time the trenching saves. What trenchless buys is the surface, the driveway or landscaping that never gets opened, not the calendar.
How long does a sewer lateral replacement take?
Two to three days for a full lateral, and depth is the bigger driver than length. The connection at the main decides the excavation: a deep main means a deep, shored hole, and a main in the street brings a road opening permit and pavement restoration into the same job. During most of that the house can still use water carefully; ask about the actual no-flush window rather than assuming it is the whole job.
How long does a septic system installation take?
One to two weeks from start to final grade, and the calendar belongs to the inspections as much as the machine. Septic in New Jersey is administered by the local health department, which reviews the design and physically inspects the installation at stages, so the work pauses for those visits. The digging itself is days; the process is weeks.
Why is my quote's timeline longer than these numbers?
Usually because the estimator saw something on your site that belongs in the schedule: rock, a deep main, a shared trench, access that needs matting, or a utility corridor that has to be hand exposed. These are our typical ranges on typical sites, not promises about yours. The useful question for any contractor is not how fast, but what specifically on this property moves the number.
What slows an excavation job down the most?
Rock, water and other utilities, in that order. Ledge rock turns digging into hammering, billed by the day because nobody knows how much rock there is until the hammer is in it. Groundwater means dewatering and shoring. And every marked gas, electric or telecom line near the path converts machine digging into hand digging for that stretch, by law, not by choice.
Sources
- Durations are our own, from jobs across Sussex, Warren and Morris Counties, stated 2026-08-30.
- The hand digging requirement near marked utilities is N.J.A.C. 14:2-3.3(a)1: no mechanized equipment within two feet horizontally of a marked facility until it has been located by hand digging.
- Septic administration by the local health department under N.J.A.C. 7:9A. Which office covers your town varies, and it is the first call on any septic timeline.
Want the number for your property, not the typical one?
Call 862-268-2510. The estimate visit is what turns these ranges into a date, and it costs nothing.
Call 862-268-2510