Burst Pipe Under Your House: What to Do in the First 10 Minutes

A burst pipe running through your crawl space is one of the most urgent water damage emergencies because the leak is hidden and can flood the space for hours before anyone notices. Acting fast in the first 10 minutes can significantly limit the damage.

Minute 1-2: Shut Off the Water. Locate your main water shutoff valve — usually near where the water line enters your home, often inside the crawl space access, a utility closet, or near the water meter — and turn it off immediately.

Minute 3-4: Shut Off Electricity If Necessary. If water is near any junction boxes, outlets, or wiring under the house, and you can safely reach your breaker panel without entering standing water, shut off power to the affected circuit.

Minute 5-6: Assess From a Safe Vantage Point. Look through the crawl space access door or vent to gauge how much water has accumulated, and photograph what you can see for insurance purposes.

Minute 7-8: Avoid Entering a Flooded, Low-Clearance Space Alone. Standing water combined with tight clearance and potential electrical hazards makes crawl spaces genuinely risky to enter without assessment — this is different advice than for an open basement.

Minute 9-10: Call for Professional Help. Call a crawl space water damage specialist immediately. The faster professional extraction and drying begins, the better the outcome for your floor joists, subfloor, and insulation.

Common Causes of Burst Pipes Under Homes: Winter freezing is one of the leading causes in unheated crawl spaces, as water expands when it freezes and can crack pipes from the inside. Aging or corroded plumbing and poor pipe insulation in an unconditioned crawl space are other common culprits.

Prevention Tip: Insulating exposed pipes running through the crawl space, and sealing vents and gaps that let in cold air, can meaningfully reduce freeze risk, though this doesn't eliminate it entirely.