A sump pump is your basement's last line of defense against flooding. Getting one installed -- or replacing a failing unit -- is one of those jobs where cutting corners costs far more later. Here's what it actually costs.
New installation vs. replacement
Replacing an existing sump pump: $400-$800 including parts and labor. New installation (digging the pit, running the drain line): $1,000-$2,500. The pit excavation and drain routing is most of the added cost.
Submersible vs. pedestal pumps
Submersible pumps sit inside the pit, run quieter, and handle debris better -- they cost $150-$400 for the unit. Pedestal pumps have the motor above the pit, are easier to service, and cost $60-$150. Most professionals recommend submersible for residential use.
Battery backup systems
A battery backup sump pump ($200-$500 installed) keeps working during power outages -- which is exactly when storms cause the most flooding. Combination systems with primary and backup pumps run $700-$1,500 installed. Worth the investment in flood-prone areas.
Signs your sump pump needs replacement
Average lifespan is 7-10 years. Replace if: the pump runs constantly, makes grinding or rattling noises, doesn't activate during rain, or is visibly rusting. Don't wait for it to fail -- a flooded basement costs $10,000-$25,000 to restore.
Bottom line
Budget $400-$800 for a sump pump replacement, $1,000-$2,500 for a new installation. Add a battery backup -- it pays for itself the first time the power goes out during a storm.
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