Winter has a way of finding every weak spot in a building. A drafty window, a hose bib that never got shut off, a furnace filter that has been in place since spring: each one is a small thing in September and a costly thing in January. If you own a rental, the stakes are a little higher, because you are not there to notice the first sign of trouble. Your tenants might not notice either, or they might not know it matters.
The good news is that winterizing a rental is a manageable project. It comes down to a handful of systems, a few hours of inspection, and some clear communication with the people living in the home. This checklist walks through the work in the order most landlords find easiest, from the outside in, and then covers what changes if the property will sit vacant for part of the season.
Why Winterizing a Rental Is Different From Winterizing Your Own Home
When you winterize the house you live in, you handle everything yourself. You hear the furnace sputter, you spot the icicle forming under the eave, and you fix it on Saturday morning. A rental changes that arrangement. The tenant is the one who notices problems first, and what they do next depends on what they have been told.
That is why a rental winterization plan has two halves. One half is the physical work: sealing, insulating, servicing, and protecting the building. The other half is the system around it: how tenants report issues, who responds, and how quickly. A well-insulated pipe still needs a tenant who knows where the main shutoff valve is.
Owners who work with Boulder property managers or other local professionals often hand off much of this coordination, but the checklist below applies whether you manage the property yourself or have help. Knowing what should happen makes it easier to tell whether it is happening.
Start the Season With a Walk-Through Inspection
Before you buy a single roll of weatherstripping, walk the property. Do it on a mild fall day when you can open windows, climb a ladder, and crawl into the utility spaces without freezing. Bring a notepad or use your phone to photograph anything that needs attention.
Look at the roofline, the siding, the foundation, the windows, the doors, and the attic or crawl space if there is one. Check under every sink for slow drips. Look at the water heater, the furnace, and any exposed plumbing. Notice where the cold air is likely to come in, because every gap you find now is one you will not have to chase later.
A written record helps in two ways. It becomes your task list for the season, and the photos give you a dated baseline of the property’s condition. If a dispute ever comes up about damage, that documentation is useful to have.
Service the Heating System Before the First Cold Snap
The heating system is the most important thing to get right. A furnace or boiler that fails on a freezing night can lead to burst pipes, unhappy tenants, and an emergency call at the worst possible price. Scheduling a professional tune-up in the fall means a technician can catch worn parts while the weather is still forgiving.
Replace the furnace filter at the start of the season, and set a reminder to replace it again on a regular schedule. A clogged filter makes the system work harder and can shorten its life. If tenants are responsible for filter changes under your lease, hand them the right size filter and show them how to swap it. Many tenants simply do not know which size to buy.
If the home uses baseboard heat, radiators, or a wood stove, check each of those too. Make sure radiators bleed properly, that baseboard covers are free of dust and obstructions, and that any fireplace or chimney has been inspected and cleaned by a qualified professional before anyone lights a fire.
Protect the Pipes From Freezing
Frozen pipes are the classic winter expense for landlords. Water expands as it freezes, and the pressure can split a pipe, sometimes in a place that stays hidden until the thaw. Prevention is inexpensive compared with the repair and the water damage that follows.
Start with the pipes that run through unheated areas: crawl spaces, basements, garages, attics, and exterior walls. Foam pipe insulation sleeves are inexpensive, easy to cut to length, and quick to install. Pay attention to the joints and corners, where gaps tend to appear. Seal any openings around pipes where they enter the house, since cold air blowing across a pipe can freeze it even inside a heated building.
Tell tenants what to do in a hard freeze. On very cold nights, opening the cabinet doors under kitchen and bathroom sinks lets warm air reach the pipes against exterior walls. Letting a faucet drip slightly can also keep water moving. These are small habits, and a short note in your tenant welcome packet or a seasonal email makes them far more likely to happen.
Shut Off and Drain Outdoor Water
Outdoor faucets, also called hose bibs or spigots, are among the first things to freeze. Disconnect and store all garden hoses before the first hard frost. A hose left attached traps water in the faucet, and that water can freeze and split the pipe behind the wall.
If the home has interior shutoff valves for the outdoor faucets, close them and drain the lines by opening the exterior spigot. If it does not, consider installing frost-proof hose bibs, which are built so the valve seat sits inside the heated part of the house. Insulated faucet covers are a low-cost backup for older fixtures.
Irrigation systems need attention too. Sprinkler lines are typically drained or blown out with compressed air by an irrigation professional before winter. Make a note of which contractor you use and book them early in the fall, since the good ones fill their calendars quickly when temperatures drop.
Seal Drafts Around Windows and Doors
Air leaks make a home harder to heat and more expensive to run, and they make tenants uncomfortable even when the thermostat says everything is fine. Run your hand around window frames and door edges on a breezy day, or hold a lit incense stick nearby and watch where the smoke wavers.
Fix what you find. Replace cracked or compressed weatherstripping, add door sweeps to exterior doors, and recaulk gaps around window frames and trim. Where windows are old and single-pane, clear plastic window insulation kits are an affordable seasonal measure. They are easy to install and remove, which makes them well suited to rentals.
Check that every window latches fully and every storm door closes tightly. A window that does not lock properly lets in cold air and is also a security concern, so this repair serves two purposes at once.
Check the Roof, Gutters, and Drainage
Water that cannot drain away becomes ice, and ice causes damage. Clogged gutters can overflow and freeze along the roof edge, which can lift shingles and push water under the roofing. They can also send water down the side of the house and into the foundation area.
Clean the gutters and downspouts after the leaves have fallen, not before. Make sure downspouts direct water several feet away from the foundation. Look at the roof for missing, cracked, or curled shingles, and check flashing around chimneys, vents, and skylights. If you are not comfortable on a ladder, a roofer or handyman can do a quick inspection for a modest fee.
Trim back tree branches that hang over the roof or near power lines. Heavy snow and ice can bring weak limbs down, and a fallen branch is an insurance claim nobody wants to file.
Handle the Water Heater and Basement Systems
The water heater works harder in winter because incoming water is colder. Check it for rust, leaks, or pooling water at the base. Many owners flush the tank once a year to clear sediment, which helps efficiency and extends its life. If the unit is old, winter is a good moment to decide whether to replace it on your schedule or wait for it to fail on someone else’s.
An insulating blanket on an older tank and insulation on the first few feet of hot water pipe can cut heat loss. Check the manufacturer’s instructions before adding a blanket, especially on gas units, so the vents and controls stay clear.
If the property has a sump pump, test it by pouring water into the pit and confirming it activates and drains. Snowmelt in spring can overwhelm a pump that has not run in months, and testing in the fall means you will not discover a problem after the flooding starts.
Test Smoke and Carbon Monoxide Detectors
Winter brings more time indoors and more use of heating equipment, which makes working detectors especially important. Test every smoke detector and carbon monoxide detector in the home, and replace batteries as a matter of routine. Replace any unit that is past the replacement date printed on it.
Carbon monoxide detectors deserve extra attention in homes with gas furnaces, gas water heaters, gas stoves, or fireplaces. Place them according to the manufacturer’s guidance, and make sure tenants know what the alarm sounds like and what to do if it goes off. Local codes and lease requirements may also set expectations for detectors, so check what applies to your area.
Provide a fire extinguisher in the kitchen if your lease or local rules call for one, and walk the tenant through where it is. A two-minute conversation at move-in or in a seasonal reminder is worth the time.
Prepare for Snow and Ice on the Property
Walkways, steps, driveways, and parking areas all become liability concerns once snow arrives. A tenant or visitor who slips on an icy path can lead to an injury claim, and the owner may share responsibility depending on the lease and local rules.
Decide in advance who handles snow removal, and write it into the lease. For a single-family rental, that is often the tenant, with the owner providing a shovel and ice melt. For multi-unit buildings, owners commonly hire a service. Whatever you choose, state the expectation clearly, including how quickly walkways should be cleared after a storm.
Repair cracked pavement and uneven steps before winter, since water gets into those gaps and expands. Make sure exterior lighting works, because short days mean tenants will be coming and going in the dark.
Communicate Clearly With Your Tenants
The best winterization work can be undone by a tenant who does not know how the house is supposed to function. A seasonal message, sent in early fall, covers a lot of ground without much effort. Include the location of the main water shutoff, how to reach you or your property manager for emergencies, the thermostat setting you recommend, and the habits that protect the pipes.
Ask tenants to keep the heat on at a reasonable level even when they travel. Many landlords recommend not letting the thermostat drop below about 55 degrees, which keeps the interior warm enough to protect plumbing. Ask them to report leaks, drafts, odd furnace noises, or ice buildup promptly, and make the reporting process simple.
A clear emergency process matters most. Tenants should know whom to call at midnight when a pipe bursts, and that call should reach a real person. This is where an experienced local manager earns their keep. For owners seeking rental property management in Broomfield, CO or nearby, round-the-clock emergency response is a question worth asking any company you are considering.
What to Do if the Rental Will Sit Vacant
An empty rental during winter needs its own plan, since nobody is there to notice a problem. Vacancy is when a small leak turns into a flooded floor, because the water can run for weeks before anyone walks in.
Keep the heat on at a low but safe setting rather than turning it off. If you decide to fully winterize a vacant property by shutting off the water and draining the lines, do it thoroughly, including the water heater, toilets, and traps, and consider using plumbing antifreeze where appropriate. A plumber can do this correctly if you are unsure. Check with your insurance provider as well, since some policies have conditions for vacant properties, including heating and inspection requirements.
Inspect on a regular schedule, and do it more often during cold snaps. Look for leaks, signs of pests, roof problems, and anything that suggests the heat has failed. Keep the walkways clear too, since an unshoveled path can signal that nobody is around.
Review Your Insurance and Lease Language
Winterizing is physical work, but it also has a paperwork side. Read your landlord insurance policy before winter to see what it covers and what it expects. Some policies treat freeze damage differently if the heat was off, and some set rules about how long a property can sit vacant.
Look at your lease as well. Does it spell out who is responsible for snow removal, filter changes, and reporting damage? Does it require tenants to maintain a minimum temperature? Clear language reduces arguments and helps if a claim ever needs to be made. If you are updating a lease template, a local attorney or a property management professional can help you make sure it matches state and local requirements.
Keep copies of your inspection photos, service invoices, and tenant communications in one folder. If you ever need to document that you took reasonable steps to maintain the property, those records will be easy to find.
Build a Repeatable Seasonal Routine
The easiest way to make winterization painless is to treat it as a recurring calendar item rather than a one-time project. Set a reminder for early fall each year, use the same checklist, and update it as you learn more about the property. Over time you will know which windows leak, which pipes need extra care, and which contractors answer the phone.
A simple version looks like this: inspect the property, service the heating system, insulate and drain what needs it, seal drafts, clear the gutters, test the detectors, set the snow plan, and send the tenant message. Most of these tasks take a short amount of time when spread across a few weekends.
If managing all of this feels like a lot, you do not have to do it alone. Owners who want a local partner for maintenance, inspections, and emergency response can talk with the team at Pennant Investment Company, who handle day-to-day rental operations for owners along the Front Range. Whether you manage the property yourself or bring in help, a steady routine means the cold months become a season you are ready for.
A Quick Cold-Weather Checklist to Keep Handy
Here is the whole plan in one place so you can copy it into your notes and work through it one item at a time.
- Walk the property and photograph problem areas.
- Schedule a heating system tune-up and replace filters.
- Insulate exposed pipes and seal openings where pipes enter the home.
- Disconnect hoses, drain or shut off outdoor faucets, and book irrigation blowout.
- Replace weatherstripping, add door sweeps, and recaulk windows.
- Clean gutters, check the roof, and trim overhanging branches.
- Flush the water heater and test the sump pump if there is one.
- Test smoke and carbon monoxide detectors.
- Set the snow removal plan and repair walkways.
- Send tenants a seasonal message with shutoff locations and emergency contacts.
- Review insurance and lease terms, and file your records.
Work through that list in early fall and the first freeze will be a lot less stressful. A little preparation protects the building, keeps tenants comfortable, and protects the income the property is there to produce.