How big is a sump pump?#
A sump pump and its basin together occupy an 18 to 24 inch pit sunk into the floor, with the pump body 22 to 36 inches tall depending on the style. The table below covers the submersible, pedestal, and battery-backup versions.
Sump pump dimensions by configuration#
| Configuration | Width (in) | Height (in) | Depth (in) | Best for |
|---|---|---|---|---|
| Submersible sump pump in basin | 18–24 | 22–30 | 18–24 | a below-floor sump basin |
| Pedestal sump pump | 10–14 | 30–36 | 10–14 | a shallow basin with the motor above water |
| Sump pump with battery backup | 18–24 | 22–30 | 18–24 | a basement that must stay dry in an outage |
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Installation clearances for a sump pump#
- Basin depth: 22–30 in in deep a sump basin sits below the floor so the pump can gather water beneath the slab.
- Basin diameter: 18–24 in in across a sump basin runs to hold the pump and the float switch.
- Discharge and check valve: A sump pump discharges up and out through a check valve so water cannot drain back into the basin.
- Backup room: A battery-backup sump pump needs shelf or floor room beside the basin for the battery and the controller.
Will your sump pump fit? Clearances and door swing#
Fitting a sump system is about the pit in the floor and a little room to service the top, not a door swing. The basin sits 22 to 30 inches deep below the slab so groundwater can collect beneath the floor, and it runs 18 to 24 inches across to hold the pump and the float switch that turns it on. Above the pit, leave enough clearance to lift the pump out and reach the float, and route the discharge pipe up and out through a check valve so pumped water cannot drain back down into the basin. If you add battery backup, plan shelf or floor space beside the pit for the backup battery and its controller. Confirm the existing basin diameter before buying, since the pump and float have to swing freely inside it.
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Sump pump sizes by type: submersible sump pump in basin, pedestal sump pump, sump pump with battery backup#
The three styles differ in where the motor sits. The submersible pump drops entirely into the 18 to 24 inch basin and runs underwater, the quietest and most common choice for a below-floor sump. The pedestal pump is narrow, 10 to 14 inches across but 30 to 36 tall, with the motor perched on a shaft above the water so it stays dry in a shallow pit. The battery-backup system pairs a primary submersible pump with a second pump and a battery in the same size basin, keeping the basement dry even during a power outage. Match the style to your basin depth and whether outages are a concern.
Sump pump dimensions: common questions#
How deep is a sump pump basin?#
A sump basin sits 22 to 30 inches deep below the floor slab so water can collect beneath it. That depth lets the pump gather groundwater before it reaches the basement floor.
How wide is a sump pump pit?#
The basin runs 18 to 24 inches across to hold the pump and the float switch. Confirm your existing pit diameter so the pump and float move freely inside.
What is a pedestal sump pump?#
A pedestal pump keeps its motor on a tall shaft above the water line, 30 to 36 inches tall but only 10 to 14 across. It suits a shallow basin and keeps the motor dry and easy to service.
How tall is a pedestal sump pump?#
A pedestal sump pump stands 30 to 36 inches tall because the motor rides above the basin on a shaft. That height is what keeps the motor clear of the water.
Does a sump pump need a check valve?#
Yes. The discharge line uses a check valve so water pushed up and out cannot drain back into the basin when the pump shuts off. Without it, the pump short-cycles.
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