In depth
Frozen and Burst Pipe Water Damage in Chicago: how the job actually runs.
Frozen and burst pipes are the number one winter insurance claim in Chicago, and they have a cruel timing. The pipe freezes on the coldest night of the year, splits quietly while the ice plug holds, and then lets go three days later when the temperature climbs back above freezing. Burst pipe water damage restoration is mostly about that third day: finding where the water went, getting it out of the walls and the basement, and drying the house before mold gets a foothold.
Why pipes burst in Chicago winters
Water expands as it freezes. In a closed pipe, the ice plug itself rarely does the damage; the pressure trapped between the plug and the closed faucet does. It splits copper, galvanized steel or PEX at the weakest point, which is often several feet from where the ice formed. Nothing comes out while the plug holds. When it thaws, the full supply pressure hits the split and water runs until someone closes the main.
Chicago gives pipes plenty of chances. The polar vortex of January 30-31, 2019 took O’Hare to about -23 degrees Fahrenheit. Extreme cold and wind chill warnings are issued by the National Weather Service. The Christmas cold snap of December 22-24, 2022 arrived with a long weekend of empty homes and unattended units. The January 2014 polar vortex did the same across the region. After each one, the thaw week that followed was the busiest week of the year for burst-pipe calls.
Thaw week
Day one of the thaw, the calls come from occupied homes where someone heard water running. Days two and three, they come from vacant units, garden apartments between tenants, houses listed for sale and second floors of two-flats where the upstairs tenant was away. By then the water has been running for days. In a two-flat or three-flat it has come down through the unit below and into the shared basement. In a high-rise it has followed the risers down through several floors.
Where pipes freeze first
- Exterior walls. A kitchen sink on an outside wall of a brick bungalow in Beverly or a bathroom on the north wall of a frame cottage in Wicker Park has a supply line separated from the weather by a few inches of masonry or siding and, often, no insulation.
- Uninsulated crawl spaces under additions and in some suburban ranches and split-levels in Park Ridge and Skokie.
- Garages with a laundry, a utility sink or the supply to a hose bib.
- Attics and attic conversions in bungalows where plumbing was run above the insulation.
- Vacant units. A garden unit between tenants with the thermostat turned down, a second-floor flat where the heat is off, a house on the market in January.
- Water heaters and boilers. Both run flat out in a cold snap and both fail in one. A failed tank keeps flowing until the cold feed is shut; a failed boiler leaves the building without heat, and the frozen pipe follows.
- Ice dams on flat and low-slope roofs push meltwater under the roofing and into top-floor ceilings. Not a burst pipe, but it arrives the same week.
The first hour: what to do
- Close the main valve. In most Chicago houses it is in the basement where the water service enters the front wall, near the meter.
- Open the faucets on the affected line to relieve pressure and let the remaining water drain.
- Cut power to the wet area at the panel, but only if the panel is dry and you are not standing in water.
- Turn the heat up and open cabinet doors on exterior walls so warm air reaches the other pipes. Other lines in the house may still be frozen.
- Move what you can off wet floors: rugs, boxes, furniture legs onto blocks.
- Photograph everything before it is moved, including the split section of pipe once the plumber has it out. Keep the pipe.
- Call us. Then call the plumber.
The step-by-step version is in frozen pipes burst? what to do in a Chicago winter, and the general first-hour checklist is in what to do in the first hour after water damage.
What burst pipe water damage restoration involves
Locating the water. Burst pipes rarely leak where they froze, and the water travels: along the top of a ceiling, down a wall cavity, under a floor. We trace it with a thermal camera and pin and non-invasive moisture meters.
Extraction. Standing water comes out of floors and the basement with truck-mount or portable units. See water extraction for what that involves.
Removal. Wet fiberglass insulation in exterior walls holds water against the framing and hides the wet area from surface meters, so it comes out along the affected run. Sagging ceiling drywall that held water is replaced. Saturated carpet pad is replaced; Category 1 carpet is usually saved.
Drying. Air movers lift moisture off surfaces and low-grain refrigerant (LGR) dehumidifiers pull it from the air. Winter changes the plan: LGR units lose efficiency in a cold room, and a basement in February is a cold room, so we add heat to keep evaporation going. Three to five days is typical; basements and slab floors take five to ten. Hardwood floors are dried slowly under controlled conditions to limit cupping, as explained in drying hardwood floors in Chicago bungalows.
Verification. We log temperature, humidity and material moisture daily and pull the equipment when every reading meets dry standard. Framing is treated with an antimicrobial where the water sat. EPA mold guidance notes that drying wet materials within 24 to 48 hours prevents most growth. If mold has already started, the job moves under the S520 standard and our mold remediation page applies.
Insurance: the maintaining-heat rule
Standard Illinois homeowners policies (HO-3) cover sudden and accidental discharge from a burst pipe, and they cover a frozen pipe on one condition: that you maintained reasonable heat in the building, or shut off the water and drained the system. That clause decides most disputed winter claims.
What helps: thermostat settings and smart thermostat history, heating bills showing the furnace ran, a record of who checked the property and when. What hurts: a gas bill of zero, or a unit empty for a month with nobody looking in.
The mitigation and drying are covered when they are documented, and adjusters expect dated photos, moisture logs, a drying log and an itemized scope in the Xactimate format. Where the carrier approves, we bill them directly. The plumbing repair itself is often not covered even when the resulting damage is. In a two-flat, three-flat or condo tower, more than one policy is involved and the association’s master policy may cover the shared structure, so get every claim number early. Our guide to documenting a water damage claim in Illinois walks through the file.
Repair or replace after a burst pipe?
| Material | Usually dried and kept | Usually removed |
|---|---|---|
| Drywall (Category 1, under 48 hours) | Yes, with baseboard off to vent | Wet more than 48 hours, sagging, or gray water |
| Fiberglass insulation in exterior walls | No | Always when wet |
| Ceiling drywall that held water | No | Always |
| Hardwood floors | Yes, with controlled drying | Severe cupping, buckling or delamination |
| Carpet | Yes, if Category 1 and dried within 48 hours | Delaminating or contaminated |
| Carpet pad | Rarely | Most jobs |
| Plaster and lath (older walls) | Often, if the keys are sound | Crumbling or detached from lath |
| Concrete basement slab | Always dried in place | Never |
What it costs
Frozen or burst pipe water damage restoration in Chicago typically runs $1,500 to $8,000 to locate the break, extract, dry and make minor drywall repairs. The drivers are how long the water ran, how many floors it passed through, whether it reached the basement, what it soaked, and whether insulation and drywall have to come out.
Emergency call-out and inspection is $250 to $500, credited against the work. Drying equipment runs $50 to $125 per unit per day. Hardwood, laminate or tile floor drying is $400 to $1,800 per area, and carpet drying is $200 to $600 per room. A break that ran for a week in a vacant building is no longer a burst-pipe job; it is a full water damage restoration at $6,500 to $18,000 or more, plus mold. The 2026 cost guide has the full table.
If a pipe has let go in your home or building anywhere in Chicago or the suburbs, close the main, open a faucet, and call us or send the form. We will find the water and start drying today.
Last updated September 11, 2026
