House Mouse
Identification and behavior: house mouse guide
Delaware Rodent Control
Rodent Exterminators in Delaware
Rat and mouse control for Delaware homes, rental units and businesses: an inspection, trapping and removal, then sealing the gaps rodents use to get back in.
Your call reaches a trusted local rodent pro.
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Which rodent control services can you get in Delaware?
Six core services, each linked to its own guide.
Where should rodent checks focus in older and newer Delaware homes?
In an older home, at foundation cracks, pipe and cable openings and worn door sweeps; in a newer one, at dryer and roof vents, garage door seals and the places utilities enter.
Where to look: Guide to rodent entry points in a house
20.7%
of Delaware housing units were built before 1960
32.7%
were built in 2000 or later
59.1%
are single-family detached homes
7.0%
are mobile homes
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates, 2020-2024
Mobile homes: check the skirting and floor openings.
Wilmington New Castle County Airport
Average low at or below 40F
January, February, March, November and December
Highest average highs
July and August
Dover
Average low at or below 40F
January, February, March, November and December
Highest average highs
July and August
Georgetown Sussex County Airport
Average low at or below 40F
January, February, March, November and December
Highest average highs
July and August
Source: NOAA National Centers for Environmental Information (NCEI), 1991-2020
The three stations sit one in each county, at Wilmington, Dover and Georgetown, and all three show the same five months with average lows at or below 40F. NOAA calls Delaware a small, relatively flat state in which no location is more than 8 miles from tidal waters.
Seal gaps before the first cold month. Rodents in fall and winter
Which rodents does this guide cover for Delaware?
The house mouse and the Norway rat, both on the strength of their national ranges. The Internet Center for Wildlife Damage Management says house mice exist across the continental United States, Hawaii and Alaska, and that Norway rats have spread throughout the contiguous 48 states, Alaska and Hawaii. Those ranges include Delaware, but the source says nothing about how common either species is in the state.
Norway Rat
Identification and behavior: Norway rat guide
Not sure which rodent you have? Compare rat and mouse droppings or see all rodent species.
Do any Delaware rental rules mention rodents?
Wilmington's do. The inspection checklist for the City of Wilmington's Residential Rental Property Program requires that a unit have no insect or rodent infestation.
Source: City of Wilmington, Department of Licenses and Inspections, accessed 2026
City of Wilmington
The same checklist asks for doorframe molding that is weather tight and rodent proof. Landlords getting ready for the inspection can use that line as a prompt to check door gaps along with the rest of the unit.
How does professional rodent control work in Delaware?
Inspect, remove, seal, then check again.
A local rodent pro usually follows these steps. How a call works
1.Call
Say what you have seen or heard, and where.
2.Inspect
Ask to be shown the entry points and signs found.
3.Remove
Trapping, and baiting where it suits the site.
4.Seal
Closing the entry gaps the rodents used.
5.Check
A return visit shows whether the work held.
How much does rodent control cost in Delaware?
The provider sets the price after an inspection.
Ask for the price in writing before work starts. How each part of a job is priced
- Building size, home or commercial
- Rats or mice, and how widespread
- Number of entry points and how hard to reach
- Attic, crawl space or wall access
- Trapping visits and dead rodent removal
- Exclusion materials and amount of sealing
- Droppings, nesting and insulation cleanup
Which parts of Delaware does this guide cover?
This guide covers the whole state. Browse every state guide
Each Delaware county anchors its own Census area. New Castle County is the Delaware part of the Wilmington metropolitan division, Kent County makes up the Dover metro area, and Sussex County makes up the Seaford micropolitan area. Sussex County's estimated population rose from an April 2020 base of 237,390 to 271,134 in 2024. In the 2020 Census, 82.6% of Delaware residents lived in urban areas and 17.4% in rural areas.
Source: U.S. Census Bureau, Population Division, accessed 2026; U.S. Census Bureau, 2020 Census, accessed 2026
When should Delaware property owners call a professional?
When rodents keep coming back or are out of reach.
Activity returns after trapping
How to know rodents are goneSounds in walls or the attic
Scratching noises guideBurrows along the foundation
Rodent exclusionA business, rental or food area
Commercial rodent controlDroppings to clean up
Safe droppings cleanupGaps you cannot safely reach
Attic rodent removal
Delaware FAQs About Rats and Mice
Which Wilmington office runs rental inspections?
The Department of Licenses and Inspections runs Wilmington's Residential Rental Property Program.
Source: City of Wilmington, Department of Licenses and Inspections, accessed 2026
What does Delaware's Division of Public Health say about garbage and storage?
Its Healthy Homes flyer says garbage should be tightly covered and storage spaces kept orderly. Before an inspection, move stored items away from the walls so the inspector can see along them.
Source: Delaware Health and Social Services, Division of Public Health, accessed 2026
What should Wilmington landlords do about debris and trash before an inspection?
Clear the debris away. The inspection checklist for Wilmington's Residential Rental Property Program says the property should be kept free of accumulated debris, with adequate trash and recycling facilities.
Source: City of Wilmington, Department of Licenses and Inspections, accessed 2026
Should holes in interior walls be closed off, or only outside ones?
Both. The Delaware Division of Public Health's Healthy Homes flyer says holes in exterior or interior walls should be closed off.
Source: Delaware Health and Social Services, Division of Public Health, accessed 2026
Why are roof rats not listed for Delaware?
The range source this guide relies on does not clearly place roof rats in Delaware, so the guide does not list them. If a rat is living in the attic rather than at ground level, compare it with the roof rat page and the Norway rat page before deciding which one it is.
Sources for This Delaware Guide
- Keep Your Household Free of Bugs (Healthy Homes flyer) (Delaware Health and Social Services, Division of Public Health, accessed 2026)
- U.S. Climate Normals 1991-2020: Monthly Normals, Station USW00013781 WILMINGTON NEW CASTLE CO AP, DE US (NOAA National Centers for Environmental Information (NCEI), 1991-2020)
- U.S. Climate Normals 1991-2020: Monthly Normals, Station USC00072730 DOVER, DE US (NOAA National Centers for Environmental Information (NCEI), 1991-2020)
- U.S. Climate Normals 1991-2020: Monthly Normals, Station USW00013764 GEORGETOWN SUSSEX CO AP, DE US (NOAA National Centers for Environmental Information (NCEI), 1991-2020)
- Delaware - State Climate Summaries 2022 (NOAA National Environmental Satellite, Data, and Information Service (NOAA Technical Report NESDIS 150), accessed 2026)
- House Mice (Internet Center for Wildlife Damage Management (university-affiliated, non-government), accessed 2026)
- Norway Rats (Internet Center for Wildlife Damage Management (university-affiliated, non-government), accessed 2026)
- Preparing for an Inspection (City of Wilmington, Department of Licenses and Inspections, accessed 2026)
- Annual Resident Population Estimates for Metropolitan and Micropolitan Statistical Areas: April 1, 2020 to July 1, 2024 (CBSA-EST2024-ALLDATA) (U.S. Census Bureau, Population Division, accessed 2026)
- P2: Urban and Rural - 2020 Census Demographic and Housing Characteristics File (U.S. Census Bureau, 2020 Census, accessed 2026)
- B25034: Year Structure Built - 2024 ACS 5-Year Estimates Detailed Tables (U.S. Census Bureau, American Community Survey 5-Year Estimates, 2020-2024)
- B25024: Units in Structure - 2024 ACS 5-Year Estimates Detailed Tables (U.S. Census Bureau, American Community Survey 5-Year Estimates, 2020-2024)
Get Help With Rats or Mice in Delaware
Describe what you found and where in the building.
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