Is it normal for pipes to burst when they freeze?

Not necessarily. Many frozen pipes thaw without bursting, especially with proper technique. The real risk comes from pressure building during the thaw itself, which is why opening a faucet first and thawing gently matters.

Can I use a hair dryer to thaw a frozen pipe?

Yes, this is one of the standard safe methods. Apply gentle, continuous heat starting from the faucet end and working back toward the frozen section, never with an open flame.

How do I know if a pipe has burst versus just frozen?

A frozen pipe produces reduced or no water flow with no visible leaking. A burst pipe means active water somewhere it shouldn't be, such as a wet wall, ceiling, or visible flow, which is a different, more urgent situation.

What temperature should I keep my house at to prevent frozen pipes?

Most guidance suggests keeping your thermostat no lower than 55°F, even overnight or while away, during genuinely cold weather.

Should I let my faucets drip during a cold snap?

Yes, for faucets connected to pipes in vulnerable, exposed locations. A slow trickle keeps water moving, and moving water is much less likely to freeze than still water.

Is it worth insulating pipes myself?

Yes. Foam pipe insulation sleeves are inexpensive and simple to install yourself on exposed pipes in unheated spaces, and it's one of the most cost-effective ways to prevent this problem from recurring.

Is it really the thaw, not the freeze, that bursts pipes?

Water expands as it freezes, and that expansion increases pressure inside the pipe. But the pipe most often survives the initial freeze itself. The real danger comes during thawing, when newly liquid water pushes forcefully against a still-frozen section further down the line, or against a closed fixture with nowhere for that pressure to go. This is exactly why opening a faucet before you start thawing matters as much as the heat source you choose.

Should my homeowner's insurance be involved in this?

Most standard homeowner's insurance policies cover sudden, accidental pipe bursts from freezing, though coverage details vary by policy. If you do end up with a burst pipe, photograph the damage before any cleanup begins and contact your insurer promptly. Documentation matters for how smoothly a claim goes.

Recommendation · DIY if Experienced

How Do I Thaw a Frozen Pipe Safely?

It's not the freezing that causes damage. It's the thawing, when pressure trapped behind the ice has nowhere to go. Doing this the wrong way is how a simple frozen pipe becomes a burst one.

Time: 20–60 min
Cost: $0–5,000
Difficulty: Moderate
Risk: Moderate Risk

Before you start

Diagnose first, then act.

A pipe that's frozen but intact is very fixable yourself, with the right technique and some patience. The real danger isn't the ice itself. It's the pressure that builds as water tries to move past a still-frozen section. Work through the causes below, and stop immediately if you find an actual crack or split rather than just a blockage.

Decision matrix

Every likely cause, with its own real cost and time, not one blended guess for the whole repair.

Decision matrix: cause, approach, cost, and time for Frozen Pipes
Cause	Approach	Cost	Time
Locating the frozen section	DIY	$0	10–20 min
Thawing a reachable section	DIY	$0–20	30–60 min
Preventing repeat freezing	DIY	$20–50	20–30 min
Burst pipe or unreachable section	Professional	$400–2,000	2–4 hrs

Causes

Tap a cause to open it. Only one stays open at a time, so it's easy to compare.

First step

Locating the Frozen Section

DIY-Friendly

Root cause

Before thawing anything, you need to know where the ice actually is. Pipes running through unheated spaces, such as against exterior walls or in basements, attics, garages, or crawlspaces, are the most exposed to cold and the most likely freeze points.

30-second check

Turn on faucets throughout the house. A trickle or no flow at all points to a freeze somewhere upstream of that fixture. Check pipes in unheated areas and along exterior walls for visible frost or a noticeably cold section by touch.

Tools & materials

A flashlight for checking crawlspaces or under cabinets.

Step-by-step

1 Test every faucet in the house and note which ones have reduced or no flow.
2 Trace the supply line for affected fixtures back toward the main line, checking for exposed runs through unheated spaces.
3 Look and feel for visible frost, a cold-to-the-touch section, or a section that looks different from the rest of the pipe.
4 Once located, open the nearest faucet on that line partway before you begin thawing. This relieves pressure as ice melts instead of trapping it.

Time: 10–20 min · Cost: $0 · Skill level: Beginner

Most common fix

Thawing the Pipe Safely

DIY-Friendly

Root cause

Once located, a frozen but intact pipe can be thawed with gentle, even heat applied along its length. The specific danger here is thawing too fast or too intensely. Concentrated heat can soften plastic pipe or weaken a soldered joint, and closed fixtures downstream can trap the expanding meltwater instead of letting it relieve pressure.

30-second check

Confirm the nearest faucet on the affected line is open partway before starting. This is what lets meltwater flow instead of building pressure behind the ice.

Tools & materials

A hair dryer or electric heating pad, towels to catch drips.

Step-by-step

1 Open the nearest faucet on the affected line partway, so water can flow as soon as the ice starts to clear.
2 Starting at the faucet end and working backward toward the frozen section, apply gentle heat with a hair dryer on low-medium, moving it continuously along the pipe rather than holding it in one spot.
3 Continue until full water pressure returns at the open faucet.
4 Once flowing normally, reduce that faucet to a slow drip until the cold snap passes, which helps prevent the same section from refreezing.
5 Never use an open flame, a propane torch, or any high-intensity heat source. These can scorch materials, weaken joints, or ignite nearby debris.

Time: 20–45 min · Cost: $0 · Skill level: Beginner

Prevention

Preventing Pipes From Freezing Again

DIY-Friendly

Root cause

Pipes freeze when they're exposed to sustained cold without enough insulation or heat nearby, a genuinely preventable situation in most homes with a few inexpensive, low-effort habits, rather than something to just wait out every winter.

30-second check

Identify which pipes are actually at risk: anything in an unheated basement, attic, garage, crawlspace, or running along an exterior wall.

Tools & materials

Foam pipe insulation sleeves (a few dollars per length).

Step-by-step

1 Wrap exposed pipes in unheated areas with foam pipe insulation, available inexpensively at any hardware store.
2 During a cold snap, let vulnerable faucets drip slightly. Moving water is much less likely to freeze than still water.
3 Keep your thermostat set to the same temperature day and night during cold weather rather than lowering it overnight.
4 If you'll be away during winter, leave the heat on, set no lower than 55°F.
5 Open cabinet doors under sinks on exterior walls during a cold snap to let household heat reach the pipes inside.

Time: 30–60 min for a typical home's exposed pipes · Cost: $10–50 · Skill level: Beginner

Not a DIY fix

Burst Pipe or a Section You Can't Safely Reach

Hire a Professional

Worth remembering

If a cause above points you toward hiring a professional, a few patterns are worth knowing before you approve anything.

Red flags

High-pressure "sign now" tactics that specifically exploit the fact that water is actively flowing and every minute feels urgent.
Reassurance that "insurance will cover it all" used to get you to sign off on repair or restoration work before you've reviewed the actual cost or scope.
A second technician or crew added to the job without a clear reason, and billed for accordingly.
No written estimate before work begins, given how easy it is to justify "whatever it takes" pricing in an active emergency.

Questions worth asking before you approve anything

Can I get a written estimate before work starts, even in an emergency?
Why is a second technician needed for this specific job?
Should I contact my insurance company before authorizing this work?

Check what this repair should typically cost

5 · FAQ

Frequently asked questions

Is it normal for pipes to burst when they freeze?

Not necessarily. Many frozen pipes thaw without bursting, especially with proper technique. The real risk comes from pressure building during the thaw itself, which is why opening a faucet first and thawing gently matters.
Can I use a hair dryer to thaw a frozen pipe?

Yes, this is one of the standard safe methods. Apply gentle, continuous heat starting from the faucet end and working back toward the frozen section, never with an open flame.
How do I know if a pipe has burst versus just frozen?

A frozen pipe produces reduced or no water flow with no visible leaking. A burst pipe means active water somewhere it shouldn't be, such as a wet wall, ceiling, or visible flow, which is a different, more urgent situation.
What temperature should I keep my house at to prevent frozen pipes?

Most guidance suggests keeping your thermostat no lower than 55°F, even overnight or while away, during genuinely cold weather.
Should I let my faucets drip during a cold snap?

Yes, for faucets connected to pipes in vulnerable, exposed locations. A slow trickle keeps water moving, and moving water is much less likely to freeze than still water.
Is it worth insulating pipes myself?

Yes. Foam pipe insulation sleeves are inexpensive and simple to install yourself on exposed pipes in unheated spaces, and it's one of the most cost-effective ways to prevent this problem from recurring.
Is it really the thaw, not the freeze, that bursts pipes?

Water expands as it freezes, and that expansion increases pressure inside the pipe. But the pipe most often survives the initial freeze itself. The real danger comes during thawing, when newly liquid water pushes forcefully against a still-frozen section further down the line, or against a closed fixture with nowhere for that pressure to go. This is exactly why opening a faucet before you start thawing matters as much as the heat source you choose.
Should my homeowner's insurance be involved in this?

Most standard homeowner's insurance policies cover sudden, accidental pipe bursts from freezing, though coverage details vary by policy. If you do end up with a burst pipe, photograph the damage before any cleanup begins and contact your insurer promptly. Documentation matters for how smoothly a claim goes.

6 · Sources

Research & References

How this guide was researched

This guide was built by cross-referencing American Red Cross winter-safety guidance and established plumbing references on the mechanics of pipe freezing and safe thawing technique. full methodology for how we evaluate cost, time, and safety risk for every guide.

Still deciding

Two other questions worth answering

This guide covers whether you can do the job yourself. These cover the two questions that often come before and after it.

Repair it or replace it?

Whether this is worth fixing at all, based on age, repair cost, and how much life it has left.

What should this cost?

Parts pricing and labor rates for your state, so you can check a quote line by line.

Related guides

If this wasn't quite it

DIY if Experienced

Low Water Pressure Throughout the House

20 min–1 hr · $0–1,500

Hire a Professional

Water Heater Not Producing Hot Water

10–20 min · $0–750

DIY if Experienced

Sump Pump Not Turning On or Running Constantly

5–30 min · $0–600

Keep exploring

Browse every Fix or Hire guide.

40 honest guides covering the home repairs people ask about most. Didn't find yours? Suggest one.

Browse all guides Suggest a guide

Before you start

Decision matrix

Causes

Root cause

30-second check

Tools & materials

Step-by-step

Root cause

30-second check

Tools & materials

Step-by-step

Root cause

30-second check

Tools & materials

Step-by-step

Root cause

30-second check

What a professional actually does

Worth remembering

Frequently asked questions

Research & References

Two other questions worth answering

If this wasn't quite it

Browse every Fix or Hire guide.