How Much to Replace Plumbing Under Kitchen Sink? (2024 Cost Guide)

A leaky pipe or clogged drain under your kitchen sink isn’t just annoying—it can lead to water damage, mold, and costly repairs if ignored. If you’re asking, “How much to replace plumbing under kitchen sink?” you’re not alone. Many U.S. homeowners face this exact dilemma each year. Whether you’re dealing with corroded pipes, outdated fixtures, or a full system overhaul, understanding the real costs—and your options—can save you time, stress, and hundreds of dollars.

What Does “Replacing Plumbing Under Kitchen Sink” Actually Mean?

Before diving into costs, it’s important to clarify what this job typically includes. Replacing plumbing under a kitchen sink usually involves:

• Removing old supply lines (hot and cold water)
• Replacing the P-trap and drain assembly
• Installing new shut-off valves (if needed)
• Upgrading pipe materials (e.g., from galvanized steel to PEX or copper)
• Fixing minor leaks or reconfiguring pipe layout

Note: This does not include replacing the sink, faucet, or major wall plumbing—those are separate projects with higher price tags.

How Much Does It Cost to Replace Plumbing Under Kitchen Sink in 2024?

According to data from HomeAdvisor and Angi (formerly Angie’s List), the average U.S. homeowner spends $150 to $500 to replace plumbing under a kitchen sink. However, your actual cost depends on several key factors:

💡 Expert Insight: “Most under-sink plumbing jobs take 1–2 hours for a licensed plumber,” says Mark Henderson, a master plumber with 22 years of experience in Chicago. “But if you’ve got old galvanized pipes or hidden leaks, that time—and cost—can double.”

What Factors Affect the Cost?

1. Type of Pipes Being Replaced

Older homes often use galvanized steel or cast iron, which corrode over time. Replacing these with modern PEX, copper, or PVC adds material cost but improves longevity.

• Galvanized to PEX: +$50–$100
• Copper installation: +$75–$150 (due to material cost)

2. Access and Layout Complexity

Tight cabinets, garbage disposals, or dishwashers connected to the same drain increase labor time. If the plumber must remove cabinetry or reroute pipes, expect a 20–40% cost increase.

3. Location (Labor Rates Vary by State)

Plumbers in New York or California charge $85–$150/hour, while rates in Texas or Ohio average $60–$90/hour (source: Bureau of Labor Statistics ).

4. Emergency vs. Scheduled Service

Calling a plumber after a midnight flood? Emergency fees can add $100–$200 to your bill. Schedule during business hours to avoid markups.

DIY vs. Hiring a Pro: Which Saves More Money?

Many homeowners consider DIY to cut costs—but is it worth it?

✅ When DIY Makes Sense

• You’re replacing a standard P-trap or flexible supply lines
• You have basic tools (wrench, bucket, plumber’s tape)
• No signs of hidden leaks or pipe corrosion

DIY Cost Breakdown:

• PEX supply lines (2): $12
• PVC P-trap kit: $15
• Shut-off valves (2): $20
• Total: ~$50

⚠️ Warning: Incorrect installation can cause leaks, water damage, or code violations. According to the Insurance Information Institute , plumbing failures cause 10% of all home insurance claims—many from DIY errors.

❌ When to Call a Pro

• Pipes are rusted, cracked, or leaking at joints
• You smell sewage (possible venting issue)
• Local codes require licensed work (common in NYC, LA, etc.)

📌 Pro Tip: Even if you DIY, turn off the main water supply before starting. Use 2–3 gallons of water to flush the system afterward and check for drips over 24 hours.

Step-by-Step: How to Replace Kitchen Sink Plumbing (Basic DIY)

Only attempt this if you’re confident and dealing with standard PVC/PEX lines.

1. Turn off water supply at shut-off valves (or main line).
2. Place a bucket under the P-trap to catch residual water.
3. Unscrew old P-trap using adjustable wrench—don’t overtighten plastic!
4. Disconnect supply lines from faucet tailpieces.
5. Install new shut-off valves (if upgrading) using Teflon tape on threads.
6. Attach new PEX supply lines (hand-tight + ¼ turn with wrench).
7. Assemble new P-trap—ensure slip nuts are snug but not cracked.
8. Turn water back on, check for leaks, and run water for 2 minutes.

🔧 Tool Tip: Keep a basin wrench handy—it’s essential for tight faucet connections.

For more on plumbing materials and safety standards, see the Wikipedia page on plumbing .

Common Mistakes That Increase Costs

• Ignoring small leaks: A drip per second wastes 3,000+ gallons/year (EPA).
• Using mismatched pipe types: Mixing copper and galvanized causes galvanic corrosion.
• Skipping permits: In some cities, unpermitted work voids home insurance.

FAQ: Your Top Questions Answered

Q: How long does it take to replace plumbing under a kitchen sink?
A: A professional typically completes the job in 1–2 hours. DIYers may take 2–4 hours, especially if troubleshooting leaks.

Q: Can I just replace the P-trap and keep old supply lines?
A: Yes—if your supply lines are flexible braided stainless steel and less than 10 years old. But if they’re rubber or corroded, replace them too.

Q: Does homeowners insurance cover plumbing replacement?
A: Usually no for wear-and-tear replacements. However, sudden leaks or burst pipes may be covered—check your policy.

Q: What’s the cheapest pipe material for under-sink plumbing?
A: PVC is the most affordable for drains (~$5/ft). For water lines, PEX costs less than copper and is easier to install.

Q: How often should under-sink plumbing be replaced?
A: Supply lines: every 5–10 years. Drain pipes (PVC): 20–40 years. Inspect annually for cracks, corrosion, or slow drainage.

Q: Can a handyman replace kitchen sink plumbing?
A: In many states, yes—for simple jobs. But licensed plumbers are required for code-compliant work involving water supply lines or gas (if near a water heater).

Conclusion

Knowing how much to replace plumbing under kitchen sink empowers you to make smart, budget-friendly decisions—whether you DIY or hire help. Most homeowners spend $150–$500, but catching issues early and choosing the right materials can prevent bigger expenses down the road.

Don’t let a small leak become a major headache. Share this guide with a friend who’s battling a dripping sink—or pin it for your next home project!

Got questions? Drop them in the comments below—we’re here to help you fix it right, the first time.