Here’s what you should know before installing a new shower or bathtub drain in your bathroom.
1. Understanding Drain Types
Before installation, you'll need to choose the right drain type based on your fixture and flooring:
Common Shower Drain Types:
- PVC or ABS compression drains (used for pre-formed shower bases)
- Linear drains (modern look, good for barrier-free showers)
- Point drains (traditional, centered placement)
Bathtub Drains:
- Toe-touch drains
- Lift-and-turn drains
- Trip-lever drains
Each has unique installation and maintenance requirements. Choose one based on usability and design preference.
2. Check Drain Location and Slope
Correct placement and slope are key for proper drainage:
- The drain location must align with the shower pan or bathtub outlet
- The drainpipe should slope at least ¼ inch per foot toward the main drain line
- Improper slope can lead to standing water, slow draining, and long-term damage
Tip: If you're changing the drain’s location, expect additional plumbing labor and costs.
3. Match Drain Size to Fixture and Code
- Most shower drains are 2 inches in diameter to handle higher water flow
- Bathtub drains are typically 1½ inches
- Check your local plumbing code to ensure compliance
Pro Tip: Use high-quality, corrosion-resistant materials like brass, stainless steel, or heavy-duty PVC.
4. Seal the Drain Properly
Poor sealing is one of the biggest causes of leaks. Proper installation includes:
- Using plumber’s putty or silicone at all junctions
- Ensuring tight connections to the waste line
- Water-testing before finishing tile or flooring
5. Consider Accessibility
For aging-in-place designs or modern wet rooms, you may want:
- Barrier-free (curbless) shower entry
- Linear drains for smooth water flow
- Easy-to-clean drain covers with removable traps
6. Professional vs. DIY Installation
Installing or relocating a drain involves:
- Cutting into subfloor or slab
- Connecting to the existing drain stack
- Ensuring proper slope and venting
DIY-friendly? Only if you're confident with plumbing and waterproofing. Otherwise, it’s best to hire a licensed plumber to ensure code compliance and prevent future leaks.
7. Cost to Install a New Drain
Costs vary depending on location, complexity, and fixture type:
| Installation Type | Average Cost Range |
|---|---|
| Replace existing drain | $150 – $400 |
| Install new drain location | $500 – $1,200+ |
| Luxury linear drain | $300 – $800+ (just for the drain) |
Tip: Costs increase if you're working on a concrete slab or moving major plumbing lines.
Final Thoughts
Installing a new shower or bathtub drain may not be the most glamorous part of your remodel, but it’s one of the most important. A well-installed drain ensures water flows where it should—out of your home, not into your subfloor. Plan carefully, follow code, and don't hesitate to call in a pro for help.