The cost to plumb a house is roughly $4,000 to $12,000 for many new homes, with larger or custom homes running higher. A whole-house repipe of an existing home typically costs about $4,000 to $11,000 with PEX and more with copper. These are estimates from published cost guides; local labor, house size, fixture count and pipe material change the price, so get at least two written quotes.
Quick answer: One widely used planning rate is about $4.50 per square foot for plumbing a new home (HomeGuide, as reported by Bankrate), which works out to about $6,750 for 1,500 sq ft. Plumbers commonly charge about $45-$200 per hour depending on the market.
Cost to Plumb a House by Project Type
| Project | Typical range | Notes |
|---|---|---|
| Plumbing a new home | About $4,000-$12,000+ | Higher for large, multi-bath or custom homes |
| Planning rate for new construction | About $4.50 per sq ft | HomeGuide figure reported by Bankrate; a rough guide only |
| Whole-house repipe with PEX | About $4,000-$11,000 | Wide range between sources; smaller homes sit at the low end |
| Whole-house repipe with copper | About $5,000-$20,000 | Higher material and labor cost |
| Replacing galvanized pipes | About $8,000-$18,000 | Often needed in older homes |
| Wall repair after repiping | Often $4,000-$4,500 extra | Patching, texture and paint, if walls are opened |
Figures come from published guides such as Bankrate and Tommy Cool. They disagree in places, which is why a written, itemized quote matters.
Estimated Cost by House Size
Using the $4.50 per sq ft planning rate as a rough starting point:
| House size | Rough estimate at $4.50/sq ft |
|---|---|
| 1,500 sq ft | About $6,750 |
| 2,500 sq ft | About $11,250 |
| 3,500 sq ft | About $15,750 |
Fixture count often matters more than square footage. One repipe guide puts homes with fewer than 10 fixtures near $4,600, 12-14 fixtures near $8,000 and more than 15 fixtures above $11,000.
Pipe Materials Compared
| Material | Cost level | Pros and cons |
|---|---|---|
| PEX | Lower | Flexible, quick to install, fewer fittings; cannot be used outdoors in sunlight |
| CPVC | Low (about $0.50-$1 per ft for material) | Rigid and inexpensive; can become brittle over time |
| Copper | Higher | Durable and long-lived; slower to install and costlier |
Check which materials your local plumbing code allows and which your water chemistry suits. Ask your plumber about warranties on both parts and labor.
Labor Costs
Published hourly rates range from about $45 to $200 per hour (HomeAdvisor figure reported by Bankrate), and another guide cites $75-$150 per hour. Rates are higher in big cities and for master plumbers. Plumbers may quote a flat price for a defined job or bill by the hour.
- Ask whether the quote includes materials, permits, fixtures and cleanup.
- Ask who patches walls and floors after pipe work.
- Get the scope in writing before work starts.
What Changes the Price
- House size and layout: More pipe and longer runs cost more.
- Number of bathrooms and fixtures: Each fixture adds supply, drain and venting work.
- Pipe material: PEX is generally cheaper than copper.
- Access: Open framing in a new build is cheaper than working inside finished walls.
- Local labor rates and permits: Big-city plumbers and strict codes raise the price.
- Old pipes and hidden damage: Galvanized, lead or damaged pipes add repair work.
- Water heater, softener or fixtures: Often priced separately from the rough-in.
How Plumbing a New House Works
- Plan and permit: The plumber works from plans and pulls the required permits.
- Rough-in: Supply lines, drains and vents are installed in open framing, before drywall.
- Inspection: The local inspector checks the rough-in before walls close.
- Finish plumbing: After drywall and flooring, toilets, sinks, faucets and the water heater are installed.
- Final inspection: The plumbing is tested and signed off.
Errors found after walls close are costly to fix, so review the plan and fixture locations before rough-in.
Permits and Inspections
Most jurisdictions require a plumbing permit and inspections for new plumbing and repiping. Fees vary by city and county, so check your local building department’s fee schedule instead of relying on a national figure.
DIY vs Hiring a Plumber
- Simple tasks such as swapping a faucet are usually fine for DIY.
- Whole-house plumbing requires knowledge of code, venting, pressure testing and often a license. Mistakes cause leaks, water damage and failed inspections.
- Check the law: Some areas restrict who can do plumbing work or require a licensed plumber.
How to Save Money on Plumbing
- Get three itemized quotes and compare scope, not just total.
- Ask about PEX where code allows it.
- Keep bathrooms, the kitchen and laundry close together to shorten pipe runs.
- Schedule rough-in while framing is open.
- Choose standard fixtures that are easy to find and repair.
- Keep a contingency of 10%-15% for surprises.
Related Cost Guides
- Cost to build a house
- Cost to build a house in Dallas
- Cost to build a house in Chicago
- Cost to build a house in Arizona
Frequently Asked Questions
How much does it cost to plumb a new house?
Many new homes cost about $4,000 to $12,000 to plumb, and larger or custom homes can cost more. One planning rate is about $4.50 per square foot. Get itemized quotes for your plans.
How much does it cost to repipe a house?
A whole-house repipe with PEX commonly runs about $4,000 to $11,000, while copper can run about $5,000 to $20,000. Wall repair after opening walls can add several thousand dollars.
Is PEX cheaper than copper?
Generally yes. PEX is cheaper in material and faster to install, which lowers labor cost. Copper costs more but is very durable. Confirm what your local code allows.
How much do plumbers charge per hour?
Published rates range from about $45 to $200 per hour depending on the market and the plumber’s experience, with many sources citing $75 to $150.
Do I need a permit to plumb a house?
In most areas, yes. New plumbing and repiping usually need a permit and inspections. Ask your local building department.
What is the difference between rough-in and finish plumbing?
Rough-in installs pipes in the walls and floors before drywall. Finish plumbing installs the visible fixtures, such as toilets, sinks and faucets, once the interior is finished.
Conclusion
The cost to plumb a house depends mostly on size, fixture count, pipe material and whether walls are open. Use the ranges above for planning, then get written quotes with a clear scope and a contingency.
Sources
- Bankrate: cost to replace plumbing (citing HomeGuide and HomeAdvisor)
- Tommy Cool: repipe house cost breakdown
- RS Andrews: new construction plumbing costs
