Sump Pump Installation & Replacement Cost
Swapping a worn sump pump in an existing pit runs $400 – $1,200 installed. Cutting a new pit into a basement floor and setting the first pump runs $600 – $2,000 because of the concrete work. A battery backup adds $600 – $1,800. Here is what each path costs and how to size the pump honestly.
Talk through this project
Describe the job, get matched with a local licensed pro on the line.
(855) 000-0000New installs, replacements & repairs · No obligation
| Job | Installed range | What it involves |
|---|---|---|
| Pump replacement (existing pit) | $400 – $1,200 | Pull old pump, set new one, reconnect discharge |
| New pit + pump install | $600 – $2,000 | Concrete cutting, dig the basin, plumb discharge |
| Battery backup system | $600 – $1,800 | Second pump, battery, charger, alarm |
| Water-powered backup | $400 – $1,000 | Plus plumbing to a pressurized supply line |
| Discharge line rerouting | $200 – $800 | Freeze protection, longer run to daylight |
| Pump | Unit range | Note |
|---|---|---|
| Pedestal pump, 1/3 HP | $60 – $180 | Motor above the pit, easy to service, louder |
| Submersible, 1/3 HP | $100 – $300 | Sits in the water, quieter, handles average basements |
| Submersible, 1/2 HP | $150 – $450 | Higher flow for deeper water table or long runs |
| Cast-iron submersible | $200 – $500 | Better heat dissipation, longer service life |
Want a real number instead of a range?
Calls are answered around the clock and routed to a licensed plumbing pro serving your area.
Call & describe the job
Tell us what you need: a new install, a replacement, or something that started leaking.
Get matched on the line
You are connected with a local licensed plumbing pro who serves your area.
Compare your numbers
Use the ranges on this page to sanity-check the quote before you commit.
Replacement vs a brand-new pit
If you already have a sump pit and the pump quit, replacement is a straightforward visit: $400 – $1,200 installed. The plumber pulls the old pump, sets the new one, checks the float and check valve, and reconnects the discharge. An hour or two of work plus the pump.
A first-time installation is a different job because the basin does not exist yet. The crew cuts the concrete floor, digs the pit to the right depth, sets a perforated basin, backfills with gravel, plumbs the discharge line out of the house, and patches the slab. That concrete and excavation work is why a new pit lands at $600 – $2,000. If the basement is being finished or you have had standing water, this is the install that prevents it from reaching the drywall and stored belongings.
1/3 HP or 1/2 HP: the honest sizing answer
Bigger is not automatically better here. A 1/3 HP submersible clears the water in most homes with an average water table, and it cycles less than an oversized pump fighting a shallow pit. Step up to 1/2 HP when you have a high water table, a deep basement, a long horizontal discharge run, or a lot of vertical lift to get water out of the house. More head and more distance need more pump.
The float switch matters as much as the horsepower. A tethered or vertical float that hangs up against the pit wall is the most common cause of a pump that runs dry or never starts, regardless of motor size. A good install leaves the float clear room to travel. If your existing pump is cycling oddly or running nonstop, our sump pump troubleshooting guide helps you tell a stuck float from a worn pump before you buy a bigger one.
Pedestal vs submersible
A pedestal pump keeps its motor on a shaft above the pit, with only the intake down in the water. It costs less, is easy to service, and lasts a long time because the motor stays dry, but it is louder and the exposed motor is not ideal in a finished space. A submersible sits fully in the basin, runs quietly under a sealed lid, and handles more water and small debris.
For an unfinished utility basement where noise does not matter, a pedestal is a sound, durable choice. For a finished basement, a high-output need, or a covered pit that controls radon and humidity, a submersible is the usual pick. Either way, a sealed lid and a check valve on the discharge are worth insisting on; they keep pumped water from draining back into the pit and keep the pit from acting as an open hole in the floor.
Backup pumps: why the second pump matters
The worst time for a sump pump to fail is the moment it matters most: a heavy storm that also knocks out the power. A primary pump on a dead circuit is just a paperweight while the water rises. That is the entire case for a backup, and it is why backups are priced as a separate line.
A battery backup system ($600 – $1,800 installed) adds a second pump, a deep-cycle battery, a charger and an alarm; it runs for hours on its own when the grid is down. A water-powered backup ($400 – $1,000 plus plumbing) uses your pressurized municipal supply to drive an ejector with no battery to maintain, but it needs city water pressure and uses some water while running, so it is not an option on well systems. If a backup failure has already let water in, our guide to a sewage backup in the basement covers the cleanup and containment side.
What the installation visit looks like
For a replacement, expect a one to two hour visit: the plumber confirms the pit, pump size and discharge route, swaps the unit, tests it by pouring water in to trip the float, and confirms the check valve holds. For a new pit, plan on a half to a full day for the concrete cutting, excavation, basin set and discharge plumbing, plus a little time for the slab patch to set.
Ask where the discharge ends up. It should daylight well away from the foundation, not loop back toward the house or tie into a sewer line where code forbids it. In freezing climates the outdoor end needs a slope and sometimes a freeze-resistant fitting so a clogged discharge does not back the system up mid-winter.
Ready to get it handled?
One call, no obligation. Describe the job and compare the quote against the ranges above.