Home & Garden

The Plumbing Checks Worth Doing Before Winter Arrives

Updated Sep 22, 2025· 6 min read
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Frost forming on exposed pipes beneath a sink near a cold basement window in winter.

In This Article

Key Takeaways

Frozen and burst pipes are one of the most common — and preventable — causes of winter home damage.
Outdoor hose bibs and exposed pipes in unheated spaces are your highest-risk areas.
Insulating pipes and draining outdoor water lines before the first freeze costs far less than repairs.
Your water heater and main shutoff valve need attention before cold weather sets in.
Knowing where your main shutoff valve is located can limit damage significantly in an emergency.
45–90 min

Summary

18 items · 45–90 minutes

Why Pre-Winter Plumbing Checks Matter

Water damage from burst pipes is among the most expensive home repair scenarios a homeowner can face. When water inside a pipe freezes, it expands — and that pressure can split copper, crack plastic fittings, or blow joints apart. The damage often doesn't show itself until the thaw, by which point water has already soaked into walls, subfloors, and ceilings.

The good news: most freeze-related failures are preventable with a methodical inspection in the weeks before temperatures consistently drop below 32°F. This checklist walks you through every system worth checking, from your outdoor taps to your hot water heater. It fits naturally into the broader home upkeep routine outlined in your home's annual maintenance calendar.

Know When to Call a Licensed Plumber

If at any point you discover a burst pipe, significant corrosion, a failing T&P valve, or any issue involving your water heater's gas or electrical connections, do not attempt to repair it yourself. These situations require a licensed, qualified plumber. Working on gas-connected appliances without proper training and permits is dangerous and may violate local building codes.

If at any point you discover a burst pipe, significant corrosion, or a gas-adjacent water heater issue you're unsure how to handle, stop and call a licensed plumber. Some repairs carry real safety risk and require a professional.

What You'll Need Before You Start

Gather your tools and materials ahead of time so the inspection goes smoothly. You don't need specialized equipment for most of these checks — just basic supplies and a methodical approach.

Required

Foam pipe insulation sleeves

Wrap around exposed pipes in unheated areas to slow heat loss and reduce freeze risk.

Required

Outdoor faucet covers (foam dome style)

Slip over exterior hose bibs to insulate them against freezing air.

Required

Flashlight or headlamp

Illuminate crawl spaces, under-sink cabinets, and dark basement corners during inspection.

Required

Bucket and garden hose (short section)

Used when flushing sediment from the water heater drain valve.

Required

Expanding foam or exterior caulk

Seal gaps and cracks in exterior walls where cold air could reach interior pipes.

Optional

Pipe repair tape or clamps

Temporary fix for minor pipe cracks found during inspection — not a substitute for professional repair.

The Winter Plumbing Checklist

Work through these grouped checks room by room and area by area. Mark off each item as you go, and note anything that needs a follow-up repair.

Outdoor Water Lines & Hose Bibs

Disconnect all garden hoses from outdoor faucets and store them indoors or in a garage where they won't freeze. Must
Shut off the interior shutoff valve that supplies each outdoor hose bib, then open the bib to drain any remaining water. Must
Install insulated faucet covers (foam dome covers) over each exterior hose bib to provide an extra buffer against freezing air. Should
Inspect all outdoor water lines running above grade for visible cracks, corrosion, or loose fittings, and repair before freezing weather arrives. Must

Exposed & At-Risk Interior Pipes

Locate any pipes running through unheated spaces — crawl spaces, garages, attics, or uninsulated exterior walls — and note them for insulation. Must
Wrap exposed pipes in vulnerable areas with foam pipe insulation sleeves, securing with tape at joints and seams. Must
Check that any pipe insulation installed in previous years is intact and hasn't become compressed, torn, or damp. Should
Seal gaps or cracks in exterior walls where cold air can reach interior pipes, using expanding foam or caulk rated for exterior use. Should

Main Shutoff Valve & Meter

Locate your main water shutoff valve and confirm every adult in the household knows exactly where it is and how to operate it. Must
Turn the shutoff valve fully off and back on to verify it moves freely; a valve that's stuck or stiff should be serviced by a plumber. Must
Check the area around your water meter for any signs of moisture, drips, or corrosion that could indicate a slow leak. Should

Water Heater

Inspect the area around your water heater for rust stains, puddles, or damp patches — any of these warrant a professional assessment. Must
Test the temperature and pressure (T&P) relief valve by briefly lifting the lever; water should discharge and stop cleanly when released. If it doesn't, call a plumber. Must
Flush a few gallons from the drain valve at the base of the tank to clear sediment buildup that reduces efficiency in cold-weather months. Should
If your water heater is located in an unheated garage or basement, verify the space stays above 40°F or consider an insulating blanket rated for water heaters. Nice to have

Indoor Drains & Fixtures

Run water through all infrequently used drains — guest bathrooms, laundry tubs, floor drains — to refresh the P-trap water seal that blocks sewer gases. Should
Check under all sink cabinets for slow drips, soft cabinet floors, or mold that may indicate a slow leak requiring repair before cold weather. Must
Confirm that any pipes sharing an exterior wall in kitchen or bathroom cabinets are not blocked by items stored inside the cabinet that could inhibit warm airflow. Nice to have

Don't Ignore Small Drips or Rust Stains

A slow drip or orange rust stain around a fitting can signal a joint under stress — one that may fail entirely when pipes contract in cold temperatures. Don't wait until spring to investigate. Have a licensed plumber assess any suspicious moisture before the freeze season arrives.

After the Checklist: What to Do Next

Once you've completed your inspection, address any flagged items promptly — before the first cold snap arrives. Pipe insulation sleeves (sometimes called foam pipe wrap) are widely available at hardware stores and straightforward to install on accessible straight runs of pipe. For pipes in tricky locations — inside walls, below slabs, or near electrical systems — have a licensed plumber assess the risk.

Set your thermostat no lower than 55°F if you plan to be away from home during cold stretches, and leave cabinet doors under sinks open on particularly cold nights so warm indoor air can reach those pipes. If you have a vacation property, consider having the water supply shut off and lines professionally blown out before you leave for the season.

For a full picture of what other systems to check as the seasons shift, see our complete home maintenance guide — it covers HVAC, roofing, electrical, and exterior upkeep alongside plumbing. And if you're running a parallel checklist on your vehicle before winter, seasonal vehicle prep covers that ground in detail.

Home & Garden Editorial Team is the collective byline for our editorial team and contributor network. Articles published under this byline or an editorial pen name are researched, written, and reviewed according to our editorial standards for clarity, consistency, and independence before publication.

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