The short answer
What You Need to Know First
Installing a shut-off valve involves cutting into your water line and connecting new fittings. You need to know where your main water supply enters the house and how to shut off the water before you start. If you mix up hot and cold lines or tighten a fitting incorrectly, you could create a leak.
Check the material of your pipes. Copper, PEX, and CPVC each require different connectors and tools. A simple compression valve works for many DIYers because it does not need soldering. If your pipes are galvanized steel or you are unsure, call a plumber to avoid a costly mistake.
Tools and Materials for the Job
Gather a pipe cutter, adjustable wrench, Teflon tape or pipe dope, and the new valve. For copper pipes, you may need a deburring tool. For PEX, you need a crimp ring and a PEX tool. Always buy a valve that matches your pipe size, usually 1/2 or 3/4 inch.
Turn off the main water supply and open a faucet to drain the lines. Cut the pipe cleanly and deburr any sharp edges. Dry-fit the valve before tightening. Apply tape or dope to the threads to prevent leaks. Tighten slowly and check for drips after you turn the water back on.
- Pipe cutter or hacksaw
- Adjustable wrench
- Teflon tape or pipe dope
- New shut-off valve
- Deburring tool for copper
- PEX crimp tool if needed
Where to Place the Valve
Install the valve on the main water line close to where it enters your home, often near the water heater or in a crawlspace. This lets you shut off water for the whole house in one spot. If you live in South Jordan, keep a note of the valve location near the main shutoff.
Some homeowners add valves for individual appliances, like a washing machine or dishwasher. That way, you can isolate a leak without cutting water to the entire house. Place these valves in accessible spots, not behind drywall. Label each valve so you know which line it controls.
When to Call a Professional
If you are not comfortable soldering copper pipes or using a PEX tool, a plumber can do the job safely. A mistake can lead to a slow leak behind walls, which causes water damage over time. The cost of hiring a plumber often depends on the pipe material and how hard the valve is to reach.
Also, if your main shut-off valve is old and stuck, replacing it may require shutting off water at the street, which is usually a utility job. In that case, a plumber can coordinate with the utility. For most homes, a simple DIY install works, but know your limits.
After the Install
Once the valve is in, test it by turning it off and on a few times. Check all connections for drips. If you see moisture, tighten gently or add more tape. A small leak now can become a big problem later, so fix it right away.
Keep the valve accessible and teach everyone in your household how to use it. During an emergency, you want to act quickly. If a burst pipe floods your home, shutting off the water fast can limit damage. For serious water damage, local water damage pros can help with extraction and drying.
Water damage does not wait
Call (801) 845-3042 any time, day or night, and describe what happened.
Call Now (801) 845-3042Frequently asked questions
Do I need a permit to install a shut-off valve?
Permits vary by city and county. Some areas require a permit for plumbing changes, while others allow simple valve swaps. Check with your local building department before starting. If you are unsure, a plumber can tell you what is needed.
Can I install a shut-off valve on a live pipe?
No, you must shut off the main water supply first. Working on a live pipe causes spraying water and makes it hard to get a good seal. Turn off the main valve, open a faucet to drain pressure, then proceed. Safety comes first.
What if my shut-off valve leaks after install?
A small leak often means the fittings are not tight enough or the tape is insufficient. Turn off the water, disassemble, and reapply tape. If the valve body itself is cracked, replace it. If you cannot stop the leak, call a plumber.