Thinking about installing a plumbing system from scratch—whether for a new home, a bathroom remodel, or an off-grid cabin? You’re not alone. Thousands of homeowners and contractors tackle plumbing projects each year, but without the right materials, even the best plans can lead to leaks, delays, or expensive rework. That’s why we’ve compiled this definitive guide: a list of plumbing materials needed to install from scratch, tailored for clarity, reliability, and real-world application.
Whether you’re a seasoned DIYer or a first-time builder, this guide cuts through the confusion and gives you exactly what you need—nothing more, nothing less.
What Does “Installing Plumbing From Scratch” Actually Mean?
Installing plumbing from scratch means building a complete water supply and drainage system where none existed before. This includes:
- Freshwater supply lines (hot and cold)
- Drain-waste-vent (DWV) system
- Fixtures (toilets, sinks, showers)
- Shut-off valves, connectors, and fittings
According to the U.S. Census Bureau, over 1.4 million new housing units were started in 2024—each requiring a full plumbing system. Getting your material list right from day one can save 10–15% in labor and rework costs, per the National Association of Home Builders (NAHB).
Essential Plumbing Materials: Categorized by System Type
To avoid overwhelm, we’ve grouped materials by function. Use this as your shopping and planning checklist.
1. Water Supply System Materials
This system delivers clean, pressurized water to fixtures.
Key materials include:
- PEX Tubing (Cross-linked Polyethylene)
Why it’s popular: Flexible, freeze-resistant, easy to install. Ideal for residential use.
Size: Typically ½” or ¾” diameter.
Tip: Use red for hot water, blue for cold—color-coding avoids mix-ups. - Copper Pipes (Type M or L)
Best for: Longevity and high-pressure applications.
Drawback: More expensive and requires soldering. - Shut-off Valves (Angle Stops or Ball Valves)
Install one per fixture to allow localized water shutoff. - Pipe Insulation
Prevents freezing in cold climates and reduces heat loss in hot lines.
💡 Pro Tip: The International Plumbing Code (IPC) requires a main shut-off valve within 5 feet of where the water line enters your home. Don’t skip this!
2. Drain-Waste-Vent (DWV) System Materials
This removes wastewater and maintains air pressure in pipes.
Must-have items:
- PVC or ABS Pipes
- PVC: White, used for drains and vents. Resists corrosion.
- ABS: Black, more impact-resistant but less UV-stable.
- Standard sizes: 1½” (sinks), 2″ (showers), 3″ or 4″ (toilets/main stack).
- P-Trap Assemblies
Creates a water seal to block sewer gases. Required under every sink, tub, and shower. - Vent Pipes & Roof Flashing
Vents extend through the roof to release gases and equalize pressure. - Cleanouts
Access points for snaking clogs—required every 100 feet of horizontal drain line (per IPC).
For a deeper dive into drainage physics, see Wikipedia’s overview of plumbing systems.
Fixture Connection Kits & Hardware
Don’t forget the “last mile” components that connect pipes to actual fixtures:
- Supply Lines (Braided Stainless Steel) – 12″ to 24″ long, with 3/8″ compression fittings.
- Toilet Flanges & Wax Rings – Secure the toilet to the drain and create a watertight seal.
- Shower Valves & Trim Kits – Include cartridges, escutcheons, and handles.
- Faucet Mounting Hardware – Often overlooked but essential for stability.
⚠️ Warning: Using non-code-compliant fittings can void home insurance. Always check local codes—many U.S. municipalities follow the Uniform Plumbing Code (UPC) or IPC.
Tools You’ll Need (Bonus Section)
While not “materials,” having the right tools prevents damage and ensures code compliance:
| Tool | Purpose |
|---|---|
| Pipe Cutter | Clean cuts on PEX or copper |
| Crimping Tool | For PEX connections (if using crimp rings) |
| PVC Primer & Cement | Bonds PVC joints permanently |
| Adjustable Wrench | Tightens nuts without stripping |
| Pipe Thread Seal Tape (Teflon Tape) | Prevents leaks on threaded joints |
Common Mistakes to Avoid When Buying Materials
Even pros make these errors—save yourself the headache:
- Buying pipe by length without a plan
Always sketch your layout first. Measure twice, cut once. - Ignoring water pressure ratings
PEX-A handles 160 psi at 73°F—but drops to 100 psi at 180°F. Know your system’s demands. - Mixing pipe types without transition fittings
Never connect copper directly to galvanized steel—it causes galvanic corrosion. - Skipping expansion loops for PEX in hot climates
PEX expands when heated. Without slack or loops, pipes can buckle.
Step-by-Step: How to Use This Materials List
Follow this sequence to ensure nothing is missed:
- Draw a plumbing layout (include all fixtures and pipe runs).
- Calculate total linear feet for each pipe type and size.
- Add 10% extra for cuts, errors, and future repairs.
- Group purchases by system: supply, DWV, fixtures.
- Verify local code requirements (e.g., some states ban ABS indoors).
- Buy from reputable suppliers—avoid counterfeit fittings (a growing issue per CPSC).
FAQ: Plumbing Materials for New Installations
Q1: Can I use PEX for the entire plumbing system?
A: Yes—PEX is approved for both supply and (in some cases) manifold-based recirculating hot water systems. However, it’s not allowed for drain lines. For drains, stick with PVC or ABS.
Q2: What’s the difference between PEX-A, PEX-B, and PEX-C?
A: The difference lies in manufacturing:
- PEX-A (Engel method): Most flexible, best memory, ideal for cold expansion fittings.
- PEX-B (Silane method): Stiffer, lower cost, uses crimp or clamp fittings.
- PEX-C (Electron beam): Rare in the U.S., less kink-resistant.
For most DIYers, PEX-B with stainless steel clamps offers the best balance of cost and ease.
Q3: Do I need a permit to install plumbing from scratch?
A: In nearly all U.S. jurisdictions, yes. Permits ensure inspections for safety and code compliance. Skipping permits can complicate home sales or insurance claims.
Q4: How much does a full plumbing material kit cost?
A: For a standard 2,000 sq ft home with 2.5 baths:
- Basic DIY materials: $1,200–$2,500
- Mid-range (PEX + quality fixtures): $3,000–$5,000
Labor (if hired) typically doubles this cost.
Q5: Can I mix copper and PEX in the same system?
A: Yes—but only with dielectric unions or brass transition fittings to prevent electrolysis. Never connect them directly.
Q6: Are there eco-friendly plumbing materials?
A: Absolutely. Look for:
- Recycled-content PVC
- Lead-free brass fittings (required by U.S. law since 2014)
- WaterSense-certified fixtures (EPA program that saves 20%+ water)
Conclusion: Build It Right the First Time
Having a list of plumbing materials needed to install from scratch isn’t just about shopping—it’s about confidence. With the right components, you’ll avoid callbacks, water damage, and sleepless nights worrying about hidden leaks.
This guide gives you a code-aware, budget-smart, and future-proof foundation—whether you’re working solo or overseeing a crew.
✅ Double-check your local plumbing codes
✅ Buy 10% extra for contingencies
✅ Label all pipes during rough-in
Found this helpful? Share it with a friend tackling their first plumbing project—or pin it for your next build!
Your future self (and your drywall) will thank you. 💧🔧
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