How to Winterize a House: Step by Step
A frozen pipe or a dead furnace in January is stressful, expensive and almost always avoidable. Winterizing your house is mostly a weekend of simple jobs done in the right order. This step-by-step guide walks you through the outside, the plumbing, the heating and the "what if" plans, with a printable checklist at the end.
Key takeaways
- Start before the first hard freeze: outdoor water lines and hoses come first, because they freeze first.
- Know where your main water shut-off is and make sure it turns. It is the single most useful thing to find before winter.
- Service the furnace or boiler, change filters and test smoke and carbon monoxide alarms before you rely on them.
- Sealing drafts and insulating exposed pipes are cheap jobs that protect both your comfort and your plumbing.
- If you will be away, keep the heat on at a safe minimum and ask someone to check the house.
Searches for "how to winterize a house" climb every autumn on Google Trends, and it is easy to see why. The first cold snap tends to arrive before most of us feel ready, and the jobs that matter most are the ones we only think about once a year. The good news is that none of them are complicated. Most need a few basic tools, an afternoon and a list.
This guide is written for homeowners, renters with outdoor space, and landlords who look after one or two properties. If you run a small business from home or own a rental, winterizing is also plain good risk management: a burst pipe can mean lost work days, unhappy tenants and an insurance claim you would rather not file.
When to start winterizing
The best time is a few weeks before your area usually sees its first hard freeze, when the weather is still mild enough to work outside comfortably. In many places that means October or November. If you have already had frost, do not panic. Start with the outdoor water jobs today, then work through the rest.
A simple way to plan it is to split the work into three short sessions:
- Session 1, outside: hoses, outdoor faucets, irrigation, gutters, outdoor furniture and tools.
- Session 2, the shell: drafts, weatherstripping, caulking, exposed pipes and the chimney.
- Session 3, systems and safety: heating service, filters, alarms, the main water shut-off and an away plan.
Pro tip
Put a recurring reminder in your calendar for the same weekend every year, labeled "Winterize the house." Attach this checklist to the reminder so next year you are not starting from memory.
Step by step: outside the house
Outdoor plumbing is the most exposed part of your home's water system. Water left sitting in a hose or a faucet pipe expands when it freezes, and that can split the pipe inside the wall, where you will not see the leak until spring.
- Disconnect and drain garden hoses. Unscrew every hose from its faucet, drain it fully and store it coiled in a garage or shed. A hose left attached can trap water in the faucet.
- Shut off and drain outdoor faucets. Many homes have an indoor shut-off valve for each outdoor faucet. Close it, then open the outdoor faucet to let the remaining water run out. Leave it open if your plumber recommends it.
- Blow out irrigation or sprinkler lines. Sprinkler systems need to be drained or blown out with compressed air. If you are not sure how your system works, this is a good job for an irrigation professional.
- Clean the gutters. Clear leaves and debris so melting snow can drain away from the roof and foundation. Gutters should be cleaned at least twice a year, in spring and fall, and more often if you have trees nearby.
- Store outdoor furniture and tools. Bring cushions inside, cover or store furniture, and winterize the lawn mower and garden tools according to their manuals.
- Prepare snow tools. Find the shovel, check the ice melt supply and make sure any snow blower starts before you need it.
Common mistake
Leaving one hose attached "just in case" for a late wash. That one hose is often the one that cracks the faucet line. If you really need water outside in winter, fill a bucket indoors and carry it out.
Step by step: plumbing and pipes
Indoor pipes can freeze too, especially those running through unheated spaces like crawl spaces, garages, attics and exterior walls. These steps protect them.
Find your main water shut-off
If a pipe does burst, every minute counts. Find your main water shut-off valve now, not during an emergency. It is often in a basement, utility room, crawl space or near the water meter. Turn it gently to make sure it moves, then tell everyone in the house where it is. Some people tie a bright tag to it so nobody has to search.
Insulate exposed pipes
Foam pipe sleeves from a hardware store slide over pipes and take minutes to fit. Focus on pipes in unheated areas and along exterior walls. Seal any gaps around pipes where they pass through walls, since cold air coming through a gap can freeze a pipe even in a heated room.
Plan for a deep freeze
During a severe cold spell, open cabinet doors under sinks on exterior walls so warm room air can reach the pipes. Keep the heat on steadily, including at night. If a faucet only produces a trickle on a very cold morning, a pipe may be partly frozen: turn off the water and call a plumber if you are unsure what to do.
Check the water heater
Winter is when your water heater works hardest. Many manufacturers recommend flushing it once a year to clear sediment, so check your manual and consider doing it now. Look around the base for signs of leaks or rust.
Step by step: drafts, heating and safety
Once the water side is handled, turn to keeping warm air in and making sure your heating is safe and reliable.
Seal drafts
Walk around the house on a windy day and feel for drafts around windows, doors, outlets on exterior walls and the attic hatch. Replace worn weatherstripping on doors and windows, add a door sweep where you see daylight under a door, and refresh cracked caulking around window frames. These small fixes make rooms feel warmer and help your heating work less hard.
Service the furnace or boiler
Book a heating service before the cold arrives, when technicians are less busy. A service usually includes cleaning, a safety check and making sure the system ignites and runs properly. Change the HVAC filter while you are at it: filters often need replacing every 1 to 3 months, depending on the type and your household.
Clean the chimney if you use it
If you have a wood stove or open fireplace that you use, have the chimney cleaned and inspected before the season. Check that the damper opens and closes properly.
Test smoke and carbon monoxide alarms
Heating season is when carbon monoxide risk rises. Test every smoke and carbon monoxide alarm, replace batteries where needed, and remember that testing monthly is the general recommendation. Make sure there is a carbon monoxide alarm near sleeping areas and near any fuel-burning appliance.
A simple winterizing log you can copy
Keeping a short log helps you see what was done, when, and what it cost. It is also useful for insurance, for selling the house later and, if you own a rental, for showing that you maintained the property responsibly. Copy this table into a spreadsheet and add a row for each job.
| Date | Job | Area | Done by | Cost | Next due | Notes |
|---|---|---|---|---|---|---|
| 2026-11-08 | Drained hoses and outdoor faucets | Outside | Self | $0 | Next autumn | Indoor valve in laundry room |
| 2026-11-09 | Fitted foam sleeves on crawl space pipes | Crawl space | Self | See receipt | Check yearly | Two sleeves left over in garage |
| 2026-11-14 | Furnace service and filter change | Utility room | Heating company | See invoice | Filter in 2 months | Technician noted worn belt |
The rows above are made-up examples to show the layout. Your own costs will depend on your home and where you live, so record the real amount from each receipt or invoice.
Example
Imagine Dana, a freelance designer who works from a converted garage office. Last winter a pipe in the garage wall froze during a cold snap, and she lost two working days waiting for repairs. This year she adds the garage to her winterizing list: she fits pipe sleeves, seals the gap under the garage door and sets a reminder to open the cabinet under the office sink on freezing nights. She also logs the work in her business records, since the space is part of her workplace. It took her one afternoon, and she now knows exactly where the shut-off valve is.
If you are going away for the winter
An empty house in winter needs a little extra care, because nobody is there to notice a problem early.
- Keep the heat on. A common guideline is to leave the thermostat at least 55°F (about 13°C) so pipes stay above freezing. Check what your heating system and insurer recommend.
- Ask someone to check in. A neighbor, friend or property manager can walk through the house regularly and spot leaks or a cold furnace.
- Consider shutting off the water. Turning off the main water supply while you are away reduces the risk of a flood. Ask a plumber whether you should also drain the system, especially if heating is off.
- Read your home insurance policy. Some policies have conditions for homes left empty for a long time. This is general information, not insurance advice, so check your own policy or ask your insurer.
Pro tip for landlords
Before winter, send tenants a short note: where the main water shut-off is, how to report a heating problem, and a reminder to keep the heat on if they travel. A two-minute message can prevent a very long repair.
Winterizing checklist
- Disconnect, drain and store all garden hoses
- Shut off and drain outdoor faucets
- Blow out or drain irrigation and sprinkler lines
- Clean gutters and check downspouts drain away from the house
- Store outdoor furniture, cushions and garden tools
- Find the main water shut-off and check that it turns
- Insulate exposed pipes and seal gaps around them
- Replace worn weatherstripping and refresh caulking
- Book a furnace or boiler service and change the HVAC filter
- Clean and inspect the chimney if you use it
- Test smoke and carbon monoxide alarms
- Prepare snow tools and an away plan
Frequently asked questions
How long does it take to winterize a house?
For a typical home, the do-it-yourself jobs fit into a weekend, split into a few short sessions. Professional jobs, such as a heating service or blowing out sprinkler lines, depend on booking availability, so schedule them early.
Should I drip faucets during a freeze?
Many plumbers suggest letting a faucet on an exterior wall drip slightly during extreme cold, because moving water is less likely to freeze. Combined with opening cabinet doors under sinks, it is a simple extra layer of protection. Ask a local plumber what makes sense for your home and climate.
Do I need to winterize if I live in a mild climate?
You may skip some steps, like blowing out irrigation lines, but checking the heating, testing alarms, cleaning gutters and sealing drafts are useful almost everywhere. Even mild areas can get an unexpected cold night.
What should I do if a pipe bursts?
Turn off the main water shut-off immediately, switch off electricity to any wet area if it is safe to do so, and call a plumber. Take photos of the damage for your insurer before cleaning up.
Related reading
The bottom line
Winterizing a house is not about doing everything perfectly. It is about handling the few jobs that prevent the worst problems: draining outdoor water, protecting pipes, sealing drafts, servicing the heating and knowing where the shut-off is. Work through the checklist over a weekend, keep a short log, and you will head into winter knowing your home is ready.
Every home and climate is different, so follow your appliance manuals, ask a professional when a job feels beyond you, and check your insurance policy for any winter conditions.
