What Happens to a Home Left Vacant Over Winter?
Last updated October 23, 2026
The short answer
The Risk of Frozen and Burst Pipes
When temperatures drop, water inside pipes can freeze and expand. This pressure often causes pipes to crack or burst, especially in unheated crawl spaces or exterior walls. If the home is vacant, this rupture can go unnoticed for weeks. A continuous flow from a broken pipe can flood floors and saturate structural materials before anyone returns.
A burst pipe can warp floors, ruin drywall, and damage personal belongings left behind during a vacancy. Without immediate attention, the water spreads and can significantly increase the cost and scope of necessary repairs. This is a risk wherever winter temperatures drop, even for short periods.
Undetected Leaks and Appliance Failures
Slow leaks from appliances or supply lines can become major problems without regular checks. A failing water heater, washing machine hose, or refrigerator ice maker line may only release a small amount of water daily. Over a month or more, however, this constant moisture soaks into subfloors and framing, causing rot and structural weakening.
The lack of activity means no one is there to notice a puddle, a drip sound, or a change in water pressure. Mold can begin to grow in these damp, dark spaces long before the water damage becomes visible on surfaces. This hidden damage often requires professional inspection and remediation to address properly.
Humidity and Mold Growth Concerns
Closed-up homes can develop poor air circulation, leading to stagnant, humid conditions. If any moisture is present from a minor leak or condensation, it creates an ideal environment for mold. Mold spores are always present in the air and only need moisture and organic material, like wood or drywall paper, to begin colonizing.
Mold growth behind walls or under carpets can become extensive before it's discovered. Some molds can cause health issues and damage building materials. Addressing the water source and drying the area completely is the first step. A mold professional may be needed to assess and remediate the problem safely.
Preventive Steps Before You Leave
Taking key actions before vacating your home can prevent many winter disasters. Shut off the main water supply to stop the flow if a pipe bursts. Drain your plumbing system by opening faucets and flushing toilets. Set your thermostat to a minimum temperature, usually above 55 degrees Fahrenheit, to keep pipes from freezing.
Have a trusted person check on the property regularly, both inside and out. They should look for signs of water intrusion, unusual humidity, or pest activity. If you live in Chandler, keep your shutoff valve location written down for your house sitter. Give them clear instructions on who to call if they find a problem.
- Shut off the main water valve.
- Drain water lines and appliances.
- Set the thermostat to at least 55F.
- Arrange for regular interior and exterior checks.
- Clean gutters and downspouts to direct water away.
- Consider installing water leak sensors that send alerts.
What to Do If You Find Water Damage
If you return to find water damage, your first step is to stop the flow at the source if it's still active. Then, contact local water damage pros. They have the equipment to extract standing water, dry structures thoroughly, and prevent further damage. The longer water sits, the more it soeps into materials and promotes mold.
Document the damage thoroughly with photos and notes for a potential insurance claim. Policies vary, and your insurer decides what is covered. Do not attempt major repairs yourself before an assessment, as this can affect coverage. The pros can help secure the area and begin the drying process to save salvageable materials.
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Call Now (480) 526-4676Frequently asked questions
Should I turn off the water heater before winter?
Yes, you should turn it off and drain it if you are shutting off the main water supply. This prevents the heater from running dry and overheating, which can damage the unit. Always follow the manufacturer's instructions for proper winterization of your specific appliance.
Can I just turn off the water at one fixture?
Turning off water at a single fixture does not protect the rest of the home's plumbing. A pipe could still burst in a wall or ceiling. For full protection during an extended vacancy, shutting off the main water supply to the entire house is the most reliable method.
What are signs of hidden water damage in a vacant home?
Look for musty odors, discolored or bubbling paint or wallpaper, warped flooring, and soft or swollen wood. Visible mold growth or a high reading on a moisture meter also indicates a problem. These signs often mean water has been present for some time behind the surfaces.