Plumbing Mistakes Homeowners Should Avoid

DIY home improvements can be rewarding and cost-effective—but when it comes to plumbing, even small mistakes can lead to big, expensive problems. At Connerney Plumbing and Heating, we’ve helped countless Natick, MA homeowners fix plumbing issues that started with good intentions but ended in water damage, code violations, or emergency calls.

In this guide, we’ll highlight the top 5 DIY plumbing mistakes homeowners often make and why it’s best to leave certain projects to licensed professionals

1. Overtightening Pipe Connections

Why It's a Problem:

Many DIYers believe that tighter is better—but overtightening fittings, supply lines, or threaded pipe joints can crack fittings or strip threads.

This can cause:

Immediate or slow-developing leaks
Burst fittings under pressure
Damaged valves or connectors

What to Do Instead:

Hand-tighten first, then use a wrench to snug slightly—without forcing it. Use thread seal tape (Teflon tape) or approved pipe thread compound where needed, and always refer to manufacturer specs.

2. Using the Wrong Materials or Parts

Why It's a Problem:

Not all pipes and fittings are compatible. Using the wrong material (like connecting copper directly to galvanized steel without a dielectric union) can cause corrosion or leaks.

Common DIY mistakes include:

Mixing incompatible pipe types (PVC with ABS without proper cement)
Choosing the wrong pipe diameter
Using indoor-only fixtures or valves outdoors

Local Relevance:

Older homes in Natick often have a mix of outdated materials like galvanized steel, which can complicate repairs or upgrades. Using the wrong parts can lead to code violations or premature system failure.

What to Do Instead:

Know your pipe type, measure carefully, and ask a professional if unsure. Licensed plumbers will ensure compatibility with Natick plumbing codes and long-term durability.

3. Incorrect Slope on Drain Pipes

Why It's a Problem:

Drainage depends on gravity. Pipes must be installed at a precise slope—typically ¼ inch per foot—to move waste without pooling or clogging.

Incorrect slope leads to:

Standing water in pipes
Slow drains or frequent clogs
Sewer gas odor backing into the home

DIY Risk:

If you're replacing drain lines or doing a bathroom remodel without accounting for pitch, you could unknowingly create a future blockage.

What to Do Instead:

Drain work should be done by a licensed plumber who can inspect venting and slope. In Natick, such work requires a plumbing permit and professional installation to pass inspection.

4. Skipping Shut-Off Valves or Access Panels

Why It's a Problem:

Valves and clean-outs exist for a reason—to give you quick shut-off access during emergencies and to make future repairs easier.

DIYers often skip:

Installing new shut-off valves under sinks or toilets
Adding access panels behind showers or tubs
Installing code-required backflow prevention

The result? A small leak or clog becomes a full-blown emergency because there’s no easy way to isolate the problem.

What to Do Instead:

Install shut-off valves with every new fixture or appliance. If you’re remodeling, ensure access panels are installed behind walls as required by local codes.

5. Forgetting About Permits and Plumbing Codes

Why It's a Problem:

Many homeowners don’t realize that plumbing work—like replacing a water heater, moving a fixture, or running a new gas line—requires a permit in Natick, MA.

Unpermitted work can:

Violate city ordinances
Fail inspection when selling your home
Lead to insurance claim denials
Result in safety hazards for your family

What to Do Instead:

Always hire a licensed, insured plumber for any job beyond basic fixture replacement. At Connerney Plumbing, we handle permits, inspections, and ensure full code compliance for peace of mind.

[Read more about plumbing permits in Natick – https://www.connerneyplumbing.com/blog]

Can I do my own plumbing in my Natick home?

No. Massachusetts law requires licensed plumbers for most work. Homeowners cannot legally perform major plumbing work on their own homes.

What plumbing projects are permit-free?

Only minor repairs (like swapping faucet cartridges or plunging a clog) are exempt. Anything involving piping changes, gas, or water heaters requires permitting and inspection.