When to call a plumber vs. DIY: a homeowner's decision chart

Plumbers charge $100–$200 an hour with a 1-hour minimum in most markets. That makes the DIY math easy for small jobs and treacherous for the ones that can flood a floor. Here's the honest split.

Do it yourself (green light)

These are low-risk, under two hours, and the worst case is a drip you can see.

• Replace a toilet flapper or fill valve — $5–$20, no tools. See our running toilet fix.
• Replace a faucet — $80–$300 for the faucet, a basin wrench, 90 minutes. Walkthrough here.
• Unclog a drain with a hand snake — $25 tool, works on most hair and soap clogs.
• Replace a showerhead or faucet aerator — 5 minutes, hand tight.
• Replace a toilet seat or a sink P-trap — plastic parts, hand tight, under $20.
• Reset or un-jam a garbage disposal — 10-minute flow chart.
• Replace supply lines to a toilet or faucet — braided stainless, $8 each, hand tight plus a quarter turn.

Judgment call (yellow light)

Doable if you're patient and your shutoff valves actually work. Have a plan for when they don't.

• Replace a toilet — $150–$500 unit, 2–3 hours, mostly lifting. Risk: cracked flange or a floor that isn't level.
• Replace a garbage disposal — $100–$250, 90 minutes. Risk: wiring if hard-wired; dishwasher knockout plug.
• Replace shutoff valves under a sink — requires shutting off the whole house. Compression valves are DIY; soldered ones are a plumber's job unless you've soldered before.
• Replace a water heater element or thermostat (electric) — $20–$60 in parts. Risk: 240V. Kill the breaker and verify with a tester.
• Flush or replace an anode rod in a water heater — see our repair-or-replace guide.

Call a plumber (red light)

Either the downside is a flood, a gas leak, or a code violation that bites you at resale — or the job needs tools you'll use once.

• Anything with the main water line, main shutoff, or pressure regulator.
• Gas water heater replacement — venting and gas connections. A wrong vent is a carbon-monoxide hazard.
• Sewer line clogs (multiple drains backing up at once, gurgling toilets). Needs a powered auger or a camera.
• Leaks inside walls or ceilings. Finding the leak is the hard part; repair needs soldering or PEX tools.
• Re-piping, moving a drain, or adding a fixture. Permit territory in most jurisdictions.
• Frozen or burst pipes. Time matters and the fix usually involves opening a wall.
• Any job where you've already tried once and made it worse. Plumbers charge more to undo DIY work — stop early.

The 3-question test

If you're on the fence, ask:

1. Can I shut the water off to this fixture, and did I confirm it's actually off? If no, hire.
2. If this goes wrong, is the worst case a drip into a bucket, or water through a ceiling? If ceiling, hire.
3. Would the specialty tool cost more than the plumber's minimum? If yes, hire.

Three yes/bucket/no answers and you're clear to try it. Anything else, get a quote — the Find a Pro page pulls 2–4 local bids in a day.