Replacement vs. new install
The gap between the two jobs is concrete: a replacement reuses the basin and discharge line already in your floor, while a new install pays to break the slab, set a liner, and route water out of the house. That’s also why a new sump usually arrives as part of a larger drainage project rather than on its own.
A pump is the exit, not the fix
A sump pump moves water out; it doesn’t stop water getting in. If the basin runs constantly or the floor still gets wet between storms, the real question is where the water comes from — grading, gutters, or hydrostatic pressure under the slab — and the fix is drainage, not a bigger pump.
Frequently asked questions
How much does it cost to replace a sump pump?
Swapping a pump in an existing basin runs about $400–$1,200 for a submersible or $250–$800 for a pedestal, installed. The pump itself is $100–$400; the rest is labor and any discharge or check-valve work done while the plumber is there.
How much does a new sump pump installation cost?
A first-time install runs $600–$2,000 because it adds the parts a replacement already has: cutting the basin into the slab, setting the liner, and running a discharge line outside. Hard slabs, finished basements, and long discharge runs push it to the top of the range.
Submersible or pedestal — which should I get?
Submersible pumps sit inside the basin: quieter, out of the way, better for finished spaces, and what most contractors install. Pedestal pumps keep the motor above the basin: cheaper and easier to service, but louder. If the sump runs often, the submersible’s durability usually justifies the difference.
Is a battery backup sump pump worth it?
If your basement floods when the power goes out — and storms that flood basements are exactly when power goes out — a $600–$1,500 battery backup is cheap insurance. Compare that to the cost of one flooded finished basement, which insurance may not cover without a specific endorsement.
How long does a sump pump last?
About 7–10 years for a submersible and a bit longer for a pedestal. If yours is past that and runs frequently, replacing it on your schedule beats replacing it during the storm that kills it.
Sources & methodology
- Waterproofing & repair cost data — HomeGuide
- Foundation repair cost data — Angi (industry cost guide)
- Foundation & basement repair cost guides — This Old House
- A licensed structural engineer / foundation contractor in your area — the authoritative source for diagnosis, scope, and a stamped repair plan
Estimates compiled from the sources above and standard cost models — not engineering, professional, insurance, or legal advice, and may not reflect your policy or local prices. See our full methodology and disclaimer.