Thinking about adding a washer and dryer to a new space—or upgrading your laundry setup? You’re not alone. Many homeowners want the convenience of on-site laundry, but the cost to install plumbing for washer and dryer can be a major sticking point. Whether you’re finishing a basement, converting a closet, or building an ADU, knowing what to expect financially—and what factors influence the price—can save you time, stress, and money. Let’s break it all down in plain terms.
What’s Included in Laundry Plumbing Installation?
Before diving into costs, it’s essential to understand what plumbing work actually involves for washer and dryer hookups:
Water supply lines: Hot and cold water connections for the washing machine.
Drain line: A dedicated 2-inch standpipe with a P-trap to prevent sewer gases from entering your home.
Venting: Proper venting to maintain drainage efficiency (required by plumbing codes).
Electrical outlet: A grounded 120V outlet for the washer; dryers typically need a 240V circuit (though this is electrical, not plumbing).
Note: While dryers don’t require plumbing, many installations bundle both appliances, so contractors often quote together.
Average Cost to Install Plumbing for Washer and Dryer (2025)
But your actual cost depends heavily on three key factors:
Location – Is the laundry room near existing plumbing (e.g., bathroom or kitchen)?
Home layout – Slab foundation vs. basement vs. upper floor.
Permit and code requirements – Vary by city and state.
Cost Breakdown by Scenario
Adjacent to existing plumbing(e.g., next to bathroom)
$500 – $1,000
Minimal pipe rerouting; labor is simpler
New location on same floor
$1,000 – $1,800
Moderate pipe extension; may need minor drywall work
Basement or garage install
$1,500 – $2,500+
Longer runs, possible concrete cutting, permits
Second-floor laundry
$2,000 – $3,500
Gravity challenges for drainage; roof venting often needed
💡 Pro Tip: Installing laundry plumbing during a larger renovation (like a kitchen or bathroom remodel) can reduce costs by 20–30% because walls are already open.
What Impacts the Installation Cost?
1. Distance from Main Plumbing Stack
Every foot of new pipe adds material and labor costs. Running lines more than 15 feet from existing plumbing significantly increases price.
2. Type of Pipes Used
PEX (cross-linked polyethylene): Flexible, freeze-resistant, and cost-effective (~$0.50/ft).
Copper: Durable but expensive (~$2–$4/ft) and requires soldering.
PVC/ABS: Used for drain lines (~$1/ft).
Most modern installers prefer PEX for supply lines due to ease of installation and code compliance.
3. Foundation Type
Slab foundation: May require jackhammering concrete to run pipes—adds $500–$1,500.
Crawlspace or basement: Much easier access; keeps costs low.
4. Permits & Inspections
Most U.S. municipalities require plumbing permits for new appliance hookups. Fees average $100–$300, but skipping this risks code violations and insurance claim denials.
If you’re curious (or considering DIY—though not recommended for beginners), here’s how professionals typically handle the job:
Shut off main water supply and drain existing lines.
Locate nearest hot/cold water lines (usually in a nearby wall or floor).
Cut into supply lines and install T-fittings for new washer connections.
Run ½-inch PEX lines to the laundry area—sloped slightly downward for drainage prep.
Install shutoff valves within 3 feet of the washer (required by code).
Cut into main drain stack and install a 2-inch ABS/PVC drain line with a P-trap and standpipe (min. 30″ tall, max. 42″).
Connect to vent stack or install an air admittance valve (AAV) if local code allows.
Pressure-test water lines and check for leaks.
Patch drywall, paint, and clean up.
⚠️ Warning: DIY mistakes can cause leaks, mold, or sewage backups. The average insurance claim for water damage exceeds $10,000—so hiring a licensed plumber is usually worth it.
Cost-Saving Tips That Actually Work
Bundle with other projects: Ask your contractor to run laundry lines while renovating a nearby room.
Choose a stacked unit: Uses less floor space and may reduce pipe length.
Use an AAV instead of roof venting: Saves $200–$500 if permitted in your area.
Unless you have plumbing experience and the right tools (pipe cutters, crimpers, drain snakes), hire a pro. The peace of mind is invaluable.
FAQ Section
Q: Do I need plumbing for a dryer?
A: No. Electric and gas dryers don’t require water lines. However, if you’re installing a combo washer-dryer unit or a steam dryer, you may need a dedicated water hookup. Always check your appliance manual.
Q: How long does plumbing installation take?
A: Most standard installations take 2 to 4 hours. Complex jobs (e.g., through concrete or multiple floors) may take 1–2 days.
Q: Can I install washer plumbing in a garage or basement?
A: Yes—but you’ll likely need a laundry sink or drain pan (required by code in many areas) to catch leaks. In cold climates, pipes must be insulated to prevent freezing.
Q: What’s the cheapest way to add laundry plumbing?
A: Place the washer/dryer as close as possible to existing plumbing—ideally sharing a wall with a bathroom or kitchen. Avoid slab foundations if possible.
Q: Are there hidden costs I should know about?
A: Yes. Common surprises include:
Concrete cutting fees ($300–$800)
Wall repair and repainting ($150–$400)
Upgrading old pipes if they’re corroded or undersized
Q: Does adding laundry plumbing increase home value?
A: Absolutely. A 2024 National Association of Realtors study found that in-unit laundry adds 3–5% to resale value, especially in urban markets where space is limited.
Conclusion
Understanding the cost to install plumbing for washer and dryer empowers you to budget wisely, avoid surprises, and make smarter home improvement decisions. While prices vary, most homeowners invest between $700 and $2,500—a modest cost compared to the convenience and value it brings.
Whether you’re finishing a basement, building a guest house, or upgrading your laundry room, proper plumbing is non-negotiable for safety, efficiency, and code compliance. When in doubt, hire a licensed plumber—it’s a small price to pay for long-term peace of mind.
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