Cost to Install a Garage Floor Drain
Installing a garage floor drain requires marking and cutting a concrete slab, excavating a trench, and setting a drain assembly, P-trap, and drainage pipe on a consistent downward slope. The trench is backfilled with clean rock before new concrete is poured and finished around the drain cover. Homeowners often take this on to improve garage-floor drainage or as part of a garage upgrade.
Common reasons homeowners do this job
- Improving drainage across the garage floor
- Adding a garage drain during a floor or garage upgrade
- Creating a drainage connection to an existing drainage system
- Creating a drainage route to a dry well
- Locating a drain at the garage floor's lowest point
DIY or call a pro?
This is a hard project because it involves cutting concrete, excavating a sloped trench, and installing the drain assembly, P-trap, and piping correctly. Consider professional help if marking the trench, establishing the downward slope, or pouring and finishing the concrete patch feels unfamiliar. Wear safety goggles and a dust mask while cutting concrete, use hearing protection with power tools, and confirm that the area is clear of underground utility lines before excavating.
Frequently asked questions
- Can I install a garage floor drain myself, or is it better to hire someone?
- This can be a DIY project for someone comfortable using a concrete saw, breaking and removing concrete, excavating, and finishing a concrete patch. Hiring help is worth considering when the drain route, the consistent downward pipe slope, or the concrete work is outside your comfort level.
- What makes the price of a garage floor drain installation go up?
- The price can rise with the job's size and number of drain units, labor time, drainage materials, and haul-away of removed concrete or other old material. Small jobs may also be affected by a minimum or trip charge.
- What should I check before choosing the drain location?
- Identify the garage floor's lowest point first so water can drain properly. Also determine whether the drainage line will connect to an existing drainage system or a dry well before marking the trench path.
- Why does the pipe slope matter for a garage floor drain?
- The drain assembly, P-trap, and drainage piping need a consistent downward slope. A key mistake to avoid is proceeding with the trench or pipe installation before that slope has been established.
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