How to Winterize Your Delaware Rental in 7 Days: The Landlord's Fall Checklist

In Delaware, mid-September is the right time to prepare your rental properties for colder weather. Waiting until the first freeze can leave you competing for HVAC technicians, roofers, plumbers, and emergency restoration crews: while a small maintenance issue becomes a tenant disruption or insurance claim.

A practical winterization plan does not need to take months. With a focused seven-day schedule, a landlord or property manager can address the most common sources of winter trouble: frozen pipes, heating failures, clogged gutters, roof leaks, ice dams, exterior water intrusion, and preventable tenant damage.

Use this checklist for each property, then save the completed work orders, invoices, photographs, and tenant communications in your property records.

Day 1: Inspect insulation, plumbing, and freeze-risk areas

Start inside the property and identify every location where pipes may be exposed to cold air. Prioritize:

• Unheated basements and crawl spaces

• Garages and utility rooms

• Attics and exterior wall cavities

• Areas around rim joists and foundation penetrations

• Plumbing under kitchen and bathroom sinks

• Exterior hose bibs and water lines

Insulate exposed pipes with properly sized pipe insulation, paying attention to valves, elbows, fittings, and vulnerable joints. Seal drafts around pipe penetrations and rim joists with appropriate caulk or expanding foam.

Do not use insulation as a substitute for repairing leaks. A slow drip can become a larger plumbing failure once temperatures drop.

Disconnect and drain outdoor hoses. Close interior shutoff valves serving exterior faucets where the system allows it, and drain the remaining water from those lines.

For vacant properties, decide whether the home will be kept heated and monitored or fully winterized. If water is shut off and the system is drained, document who completed the work and what was drained. Plumbing fixtures, traps, toilets, appliances, and sprinkler systems may require separate procedures.

The American Red Cross recommends keeping heat set no lower than 55°F when away. Your insurance policy or local requirements may call for different or more specific measures.

Day 2: Service the heating system before demand peaks

Schedule a professional inspection and service for every furnace, boiler, heat pump, and other heating system. Confirm that the system:

• Starts reliably and reaches the thermostat setting

• Has clean or recently replaced filters

• Has unobstructed supply and return vents

• Shows no signs of leaking, unusual noise, or short cycling

• Has properly connected flues, vents, and exhaust components

• Has accessible shutoffs and clearly labeled controls

For fuel-burning systems, the technician should evaluate combustion, venting, heat exchangers, electrical connections, and safety controls. Chimneys and flues should also be inspected where applicable.

Test thermostats and replace weak batteries. Check that each unit can maintain a safe temperature, especially in rooms above garages, finished basements, and other areas that tend to be colder.

Review smoke and carbon monoxide alarms at the same time. Under Delaware’s carbon monoxide detection law, required alarms generally apply to rental units with fuel-burning appliances, fireplaces, or attached garages. Installation is the owner’s responsibility, while tenants in longer-term leases may be responsible for maintaining operable batteries inside their units.

Keep service records with the property file. A dated invoice is more useful than a note that says “HVAC checked.”

Day 3: Clean gutters and correct drainage problems

Gutters and downspouts are part of your property’s winter defense. Leaves and debris can block drainage, causing water to back up under roofing, overflow near foundations, or freeze into heavy ice buildup.

On Day 3:

• Clean all gutters and downspouts

• Confirm downspouts discharge away from the foundation

• Repair loose fasteners, sagging sections, and open seams

• Replace damaged extensions or splash blocks

• Check that water does not pool near entryways or basement walls

• Remove leaves from drains, window wells, and low areas

Look for staining on fascia boards, siding, soffits, and basement walls. These signs may indicate an existing drainage problem that should be corrected before winter precipitation arrives.

If the property has a flat roof, low-slope roof, or history of ice dams, schedule a closer roof and drainage inspection. Do not assume a roof is ready simply because it did not leak last winter.

Day 4: Inspect the roof and exterior envelope

Walk the exterior and look for conditions that allow wind, rain, or melting snow into the property. Check:

• Missing, cracked, or lifted shingles

• Damaged flashing around chimneys, vents, and roof transitions

• Loose siding or trim

• Cracks around windows and doors

• Deteriorated mortar or foundation openings

• Damaged porch roofs, railings, and steps

• Trees or branches that could contact the roof or power lines

Repair small defects before they become water intrusion claims. Replace failing caulk around windows and doors, secure loose exterior materials, and verify that attic insulation and ventilation are not blocked.

Day 5: Weatherstrip, caulk, and protect water shutoffs

Day 5 focuses on small details that reduce heat loss and prevent cold air from reaching pipes.

Replace worn door sweeps and weatherstripping. Caulk gaps around window frames, exterior penetrations, plumbing entries, and utility lines. Make sure basement and crawl-space doors close properly, and confirm garage doors seal reasonably well.

Then locate and label:

• The main water shutoff

• Individual unit shutoffs

• Water heater shutoffs

• Laundry supply valves

• Outdoor faucet shutoffs

• Gas and electrical shutoffs, where appropriate

Test valves carefully. If a valve is frozen, corroded, inaccessible, or difficult to operate, repair it before an emergency occurs. Consider installing leak and low-temperature sensors near water heaters, laundry hookups, kitchens, bathrooms, and vulnerable mechanical rooms.

A sensor is not a replacement for inspections, but it can shorten the time between a failure and your response.

Day 6: Send tenants clear winter instructions

Tenant communication is a major part of winterization. Send instructions before the first significant cold snap and keep a record that they were delivered.

Ask tenants to:

• Keep the thermostat at or above the minimum temperature in the lease or property instructions

• Avoid turning off heat completely during cold weather

• Keep cabinet doors open under sinks on exterior walls during severe cold

• Keep garage doors closed when plumbing is nearby

• Disconnect outdoor hoses

• Report loss of heat, dripping pipes, leaks, or unusual odors immediately

• Notify management before an extended winter absence when required by the lease

The Red Cross recommends a steady thermostat setting and allowing exposed-pipe faucets to drip during very cold weather. The Federal Emergency Management Agency’s winter guidance also emphasizes insulation, caulking, weatherstripping, pipe protection, and knowing how to shut off water.

Delaware tenants have responsibilities too. Under 25 Del. C. § 5507, tenants must use plumbing, heating, electrical, and other facilities reasonably and must notify the landlord promptly of needed repairs. The lease may also address thermostat settings, extended absences, and responsibilities for damage caused by neglect.

However, lease language does not eliminate the landlord’s maintenance obligations. Delaware landlords must comply with applicable housing codes, maintain supplied facilities in good working order, and provide a safe, fit rental unit. Heat-related duties can also depend on the lease and local housing code. Review Delaware’s Residential Landlord-Tenant Code and consult qualified legal counsel for property-specific questions.

Day 7: Document completion and review insurance requirements

Close out the week by creating a winterization file for each property. Include:

• Completed inspection checklist

• HVAC service report

• Plumbing and insulation photographs

• Roof and gutter work orders

• Thermostat and sensor verification

• Shutoff locations

• Tenant instructions and delivery records

• Contractor invoices and warranties

• Follow-up items with due dates

Review your landlord insurance policy with your agent before winter. Pay particular attention to frozen-pipe exclusions, vacancy or unoccupancy conditions, water-damage limitations, service-line endorsements, and requirements to maintain heat or shut off and drain plumbing.

Many policies cover sudden and accidental water damage only when the owner takes reasonable steps to prevent freezing. The Insurance Information Institute explains that policies may require maintaining heat or shutting off and draining water systems. Coverage varies, so do not assume an endorsement covers damage caused by deferred maintenance.

If a pipe freezes or bursts, shut off the water if safe, protect occupants, arrange emergency mitigation, photograph the damage, and notify the insurer promptly. Preserve work orders and records showing the preventive steps you took.

The business case for prevention

Planned winterization usually costs far less than an emergency response. Prevention may involve a service call, pipe insulation, weatherstripping, sensor installation, or a small roof repair. An emergency can involve after-hours labor, water extraction, drywall and flooring replacement, mold remediation, tenant relocation, lost rent, a deductible, and a potentially disputed insurance claim.

The difference is not just the repair invoice. It is the cost of downtime, interrupted tenant relationships, owner stress, and lost control of the property.

Need help completing the checklist?

Advanced Realty Solutions has owned and operated rental properties for 15 years, so we understand winter preparation from an investor’s perspective: not just a vendor’s. Our in-house maintenance team handles plumbing, HVAC, roofing, electrical work, and general repairs for rental owners throughout Delaware.

From seasonal inspections to emergency response, our property maintenance team manages the work order, coordinates the repair, and reports the result back to the owner. We also provide full-service property management throughout Delaware, including tenant communication, inspections, rent collection, and day-to-day oversight.

To prepare your rental before the first hard freeze, request a management consultation.