DIY PLUMBING VS HIRING A PLUMBER: WHAT YOU SHOULD NEVER FIX YOURSELF
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Got a leaky tap and a free Saturday?
Most homeowners will grab a wrench before they even pick up the phone. Totally understandable. Pop in a video, buy a part at the hardware store and you’re done!
Here's the problem:
Some plumbing tasks can look easy but hide serious dangers. If done incorrectly, a $20 repair can lead to a flooded bathroom, a moldy stud wall, or even a gas leak.
Homeowners recently reported spending $1,852 on average to fix DIY mistakes. Ouch. That's money down the drain on a project that was supposed to save you money.
So where do you draw the line?
Let's jump in...
Inside this guide:
- When DIY Plumbing Makes Sense
- Why Hiring A Pro Pays Off
- 5x Plumbing Jobs You Should Never Fix Yourself
- How To Tell If A Job Is Too Big
When DIY Plumbing Makes Sense
Not all plumbing jobs require a professional. Many are fast, inexpensive and pose minimal risk to you or your home. If you have some common tools and a little patience, you can tackle:
- Unclogging a sink with a plunger
- Replacing a worn toilet flapper
- Swapping out a showerhead
- Fixing a dripping tap washer
Don't underestimate these small repairs. The EPA estimates the average household wastes almost 10,000 gallons of water per year due to leaks. Many of these leaks come from faulty toilet flaps or leaking faucets.
So fixing them yourself is a smart move.
But here's the thing...
There's actually a very fine line between a "simple fix" and a "big problem".
Why Hiring A Pro Pays Off
Quality residential plumbing repair services aren't focused only on the issue you see right now. Good plumbers evaluate your entire plumbing system. They inspect your water pressure, pipe integrity, venting and code compliance. These are things you typically will not learn about in a DIY video. Licensed plumbers of Rancho Cucamonga find hidden leaks and know how to perform permit-level repairs without risk to homeowners in Southern California, preventing a small home plumbing repair from turning into an expensive insurance claim later.
And that matters a lot.
Water damage and freezing account for nearly 22.6% of homeowners insurance claims per the Insurance Information Institute. Wind and hail cause more claims.
Even more concerning, those claims keep rising in price. The cost of non-weather water damage rose 63% from 2019 to 2025.
Translation: a botched DIY job costs more today than ever before.
Hiring a licensed plumber also means that they have the proper tools to do the job. If something goes wrong, they are insured. They also know how to install things to code. You have the peace of mind that it is done right the first time.
Pretty important, right?
5x Plumbing Jobs You Should Never Fix Yourself
Okay on to the main event. These are the jobs that should ALWAYS be done by a professional...
1. Gas Line Repairs
This one is non-negotiable.
Many water heaters, stoves and dryers use gas. One small error on a gas fitting can cause a leak, fire, or carbon monoxide poisoning. You may not even smell it right away.
Most places require a licensed professional AND a permit for any gas work. You could also void your homeowner's insurance by doing it yourself.
If it involves gas -- step away from the wrench.
2. Water Heater Installation
Water heaters look like big metal boxes. Simple, right?
Not exactly. Water heaters involve high temperatures, high pressures and often gas or high-voltage electricity. The pressure relief valve needs to be installed properly. If not, the tank can create excessive pressure.
Improper venting. Inadequate venting on a gas heater can force dangerous fumes back into your living space.
And here's the kicker...
Most water heater installations also require a permit and inspection. By skipping these steps you could encounter problems when selling your home or filing an insurance claim.
3. Main Sewer Line Problems
Drains slow in multiple areas? Gurgling toilets? Foul odor in your yard?
That usually means you have a problem with your main sewer line. And it's not going to plug.
Tree roots, broken pipes, or years of buildup can clog sewer lines. Clearing them out requires video inspections and specialized equipment such as hydro-jetters. Raw sewage can also pose serious health hazards you don't want to risk.
Renting a drain snake from the store may clear the line for a week. If roots are your problem, however, they will return.
4. Moving Or Adding New Pipes
Planning a bathroom remodel? Want to move the kitchen sink?
Whenever you install, change the location or modify plumbing of any kind it becomes complicated. Things you have to consider include:
- Correct pipe slope for drains
- Proper venting
- Water pressure
- Local code and permits
Mess up the slope and your drains won't move waste. Forget to vent and you'll smell sewer gas and have gurgling drains. Worse, both errors are hidden behind walls... until they leak.
5. Hidden Leaks Behind Walls Or Under Slabs
Damp spot on the ceiling. Warm spot on the floor. And suddenly an inexplicable spike in the water bill.
All of these are symptoms of a stealthy leak. Finding them is a difficult process.
Pros use acoustic sensors, thermal cameras and pressure testing to locate leaks without tearing out walls. Guesswork (and cutting holes to look) will generally create more problems than it solves.
How To Tell If A Job Is Too Big
Still not sure if you should DIY it? Ask yourself these 3x questions:
- Does it involve gas, electricity or a permit?
- Is the pipe concealed within a wall, beneath a floor or within the ground?
- Could one mistake flood your home?
If you answered "yes" to any of them... call a pro.
One more quick rule. If you have watched more than two videos and still do not feel confident. That's your answer. Plumbing requires confidence. An incomplete job sitting overnight with the water on can wreak havoc while you sleep.
The Bottom Line On DIY Plumbing
Doing your own plumbing can save you money ...if it's the right project. Replacing a showerhead or stopping a running toilet is perfect weekend DIY.
But some jobs carry way too much risk. To quickly recap, never DIY:
- Gas line repairs
- Water heater installs
- Main sewer line problems
- New or moved pipes
- Hidden leaks
Simple. Fix the small issues yourself and leave the big problems to a professional plumber. Your house (& pocketbook) will thank you.