Sump Pump Installation in Chilliwack, BC

How a Sump Pump System Works

A sump pump sits in a pit, called a sump basin, set into the lowest point of your basement floor. Groundwater directed there by your interior drain tile or foundation drainage collects in the pit, and once it reaches a set level, a float switch triggers the pump to push that water out through a discharge pipe, away from the foundation, before it can rise high enough to flood the floor.

Most basements use a submersible pump, sealed and installed directly inside the pit, since submersible units run quieter and handle debris better than the pedestal-style pumps common in older installations. The discharge line runs up and out through the rim joist or foundation wall, terminating well away from the house so the water doesn't drain back toward the foundation it was pumped away from.

A sump pump only works as well as the system feeding it. If your interior drain tile or grading isn't directing water to the pit efficiently, the pump can be sized correctly and still fall behind during a heavy rain event.

Primary vs Battery Backup

A primary sump pump runs on household power, which is exactly the problem: BC's heaviest rain events, the atmospheric river storms that hit the Fraser Valley every fall and winter, are also the storms most likely to knock out power. A pump that only runs on grid power stops working at precisely the moment your basement needs it most.

A battery backup system sits alongside the primary pump and takes over automatically if power drops or the primary pump fails for any other reason, running on a dedicated battery rather than the home's electrical panel. Runtime depends on battery capacity and how often the pump cycles, but most backup systems provide somewhere between 4 and 12 hours of protection on a full charge, enough to cover a typical storm-related outage. Batteries need replacing roughly every 3 to 5 years to stay reliable.

Battery backup isn't the right fit for every basement. If your area rarely sees heavy groundwater and your primary pump is well-maintained, it may be more system than you need. We'll walk through your storm and power-outage history for the property before recommending one.

Sizing Your Sump Pump

Sump pump capacity is measured in horsepower and gallons per minute, and undersizing is one of the most common mistakes we see in existing installations. A 1/3 hp pump moves roughly 40 gallons per minute at a moderate lift and is enough for most average-sized basements with light to moderate water flow. A 1/2 hp pump handles 50 to 60 gallons per minute, and is the better choice for basements with a history of heavier water, a discharge line with more than 10 feet of vertical lift, or a larger drainage footprint feeding into the pit.

The horsepower rating alone doesn't tell the whole story. What matters is how many gallons per hour the pump moves at your specific discharge height, since a longer or steeper discharge run reduces effective flow compared to the pump's rated capacity. We size the pump to your basement's drainage load and discharge distance during the inspection, not off a generic recommendation.

Installation Process and Cost

Installing a sump pump starts with cutting and excavating a pit in the lowest point of the basement floor, typically 24 to 30 inches deep, and setting a perforated basin to let groundwater in while keeping soil out. The pump goes into the basin, the discharge line is run out through the rim joist or wall, and the float switch and check valve are tested before the concrete around the pit is patched.

A standard sump pump installation, including the pit and basin, generally runs $500 to $1,500 in labour and materials, with most straightforward jobs landing between $600 and $1,500. If you're adding battery backup to an existing system, that typically adds $400 to $1,500 depending on the battery capacity and runtime you want.

Most installations take a single day. We test the full system, primary pump, discharge line, and backup if installed, before we leave, and give you a written quote covering pit excavation, pump, and backup as separate line items so you know exactly what you're paying for.