Last updated: July 2026
Installing a sump pump is a full-afternoon project for a capable DIYer. The pit digging is the hardest part — everything else is standard PVC plumbing. This guide walks you through every step so you know exactly what to expect before you start.
What You Will Need
- Sump pump (1/3 to 1/2 HP)
- Sump pit / basin (18-24 inch diameter)
- PVC check valve
- 1.5-inch PVC discharge pipe and elbows
- PVC cement and primer
- Level, drill with masonry bit
- Shovel and floor chisel
- Teflon tape, utility knife
Step 1: Choose the Right Location
The sump pit goes in the lowest point of your basement. Walk the floor after heavy rain — where does water pool first? That is your target zone. Avoid placing it near load-bearing walls. If unsure, consult a plumber first.
Step 2: Dig the Sump Pit
Use a jackhammer or heavy-duty chisel to cut through the concrete floor. Remove the section, then dig down 24-30 inches. Line the pit with a pre-formed plastic basin. Add 2-3 inches of coarse gravel at the bottom for drainage.
Step 3: Install the Check Valve
The check valve goes on the discharge pipe right above the pump. It stops water from flowing back into the pit after the pump shuts off. Without it, your pump will cycle on and off constantly, burning out fast. Slide the valve onto the pipe with the arrow pointing outward. Secure with hose clamps.
Step 4: Set the Pump in the Basin
Lower the pump onto the gravel base. Connect the discharge pipe to the pump outlet using PVC fittings and cement. Use Teflon tape on threaded connections. The float switch should activate when water reaches 6-8 inches above the pump — most come pre-set, but check the instructions.
Step 5: Run the Discharge Pipe Outside
The discharge line needs to carry water at least 10 feet from your foundation. Run the 1.5-inch PVC pipe up and out through the wall or floor, then to the exterior. Use as few elbows as possible — each one adds backpressure. The pipe should discharge at ground level or into a drainage ditch. Never direct discharge into your sewer line or near a neighbor’s foundation.
In freezing climates, make sure the pipe slopes downward at all points to prevent trapped water from freezing and cracking the pipe.
Step 6: Connect to Power
Plug the pump into a dedicated GFCI outlet. Do not use an extension cord — the pump draws heavy current on startup. If you do not have a GFCI circuit, hire an electrician before testing the pump.
Step 7: Test It
Pour a bucket of water into the pit. The pump should turn on automatically. Watch the discharge line — water should flow freely out the end. If the pump does not activate, check the float height setting. Let it run through a full cycle and confirm the float shuts the pump off when water level drops.
Step 8: Cover the Pit
Seal the pit with a fitted lid. This prevents debris, pests, and accidental objects from falling in. Some lids have a secondary connection for a battery backup pump — worth considering if you live in an area with frequent power outages.
When to Call a Plumber Instead
DIY installation is reasonable if you are comfortable with basic plumbing and concrete work. But call a pro if the installation requires cutting into a load-bearing wall, your municipality requires a permit and inspection, you are dealing with a very deep pit or poor soil conditions, or the discharge needs to route to a municipal storm system. Professional installation typically runs $350-$700 for labor.
Common Mistakes to Avoid
- No check valve: Water cycles back into the pit, pump never shuts off
- Discharge too close to foundation: Water ends up right back where it started
- Wrong pipe size: Running 1.25-inch pipe with a 1.5-inch pump outlet causes backpressure and reduces efficiency
- Non-GFCI outlet: Code violation and shock hazard in a wet environment
- No pit lid: Debris jams the float or damages the pump
The Bottom Line
Installing a sump pump yourself is entirely doable in an afternoon. Take your time on the discharge routing, test the float settings before closing up the pit, and add a battery backup. Once running, check it once a year by pouring water in. You are done.
