Common Entry Points for Rodents Entering Southern California Homes


Fall is upon us and cooler weather means more time inside. You’re not the only one seeking warmth from the cold, though. While mice spend the spring and summer months gathering food to store, activity peaks during the fall and winter months (October, November, December, January ) as temperatures start to decline and rats and mice return to their indoor nests in search of food and shelter. In Southern California, this means Black or ‘Roof’ Rats are heading for attics and crawl spaces. Mice are becoming a more frequent occurrence but are not as common inside a home as rats. Often, juvenile rats are mistaken for mice.

Southern California Roof Rats

Both Rats and Mice find opportunities to enter a home. While the simple entry point is often the one used, Rats can ‘make a hole’ and will do so more often than mice, due to some physical limitations. Making these entry points and the areas around your home or structure less attractive to rodents is a big first step. Tree branches, bushes growing over the roof line, or other items can make a ‘bridge’ that rats use to get onto the roof and find its way into the attic via a roof vent or gable area. Bushes can make holes in window screens and allow rodent entry. Items left along the side of houses make great rodent harborage areas and can lead them into an open vent or plumbing gap. YES, RATS CAN CLIMB STRIGHT UP THE WALL, generally into the attic using an attic vent hole or beside the chimney rafter tail. Do not let exterior items become a bridge for rodents to get into your home.

While Rats easily take advantage of deterioration found in older homes, their small stature also allows them to find their way into new construction houses as well. Regardless of age of construction, nearly every home is susceptible to rodent intrusion. Not only can rats take advantage of existing holes and gaps in your home but they will also use their powerful teeth to chew holes of their own. Rats also have an amazing ability to climb, meaning they can enter your home through openings well above ground level. Rats can easily ascend vertical brick walls to access roof areas and they are also known for climbing vines and vegetation that extend to the roofline. Palm Trees and Bougainvillea’s are a favorite harborage and bridge into a home.

While every home is different, there are some common points of entry for rodents:

  • #1 – Air conditioning condensing unit line. The black line running from the exterior A/C unit into the house
  • Around the foundation
  • Around holes for electrical, plumbing, cable & gas lines
  • Attic vents & crawl space vents
  • In the roof among the rafters, gables, eaves & vents
  • Under doors, especially garage doors both the big & small doors.
  • Exterior Water Heater & Laundry Areas


Wherever different building materials meet on a home there is an opportunity for rodents to find a gap. What makes Versa-Tech so unique is our ability to perform a thorough inspection and to properly identify rodent damage, species, entry points and areas of “harbor-age”. A proper inspection allows Versa-Tech to provide faster results and the proper service. We don’t stop there. Versa-Tech will also follow up regularly and perform follow up inspections to make sure the job was done correctly. This makes Versa-Tech accountable for our work.

If you think your business or home may have rodent activity, or just want a plan to keep rodents away, please contact us for a free inspection.


If rodents have gained access to a structure, a Rodent Exclusion and Trapping Service is likely warranted. This includes Attics, Crawl Spaces, Drop Ceiling areas, basements, roof areas, almost any structure we can seal up and remove rodents from, or control. T-Rex traps are set inside service areas either using zip ties (attached to utility lines) or screws (attached to any wood surface). No traps are just ‘placed’ inside. We install traps along the most identifiable rodent pathways. We can tell this by identifying the rodents rub marks, track marks and droppings. This service will stop the current activity from entering the service areas and future activity from getting in. We will be assessing and servicing rodent entry points from both interior and exterior areas, we go foot by foot along the perimeter and other areas to seal and identify possible rodent entry points. 

Being a ‘detective’ is a big part of this service. Exterior areas are assessed for any harbor-age or other issues that will attract rats to the structure, such as trees and other vegetation overgrowth or poor storage practices. Last is the roof. We inspect the roof and roof vents for entry points. For Spanish and other clay tiles, this is very important.

We exclude all possible entry points leading from the roof into structure areas. Follow ups are next and are key to assuring all the exclusion is looking and functioning great.


When it comes to mice, there are countless potential potential areas for entry. Identifying all the dangers should be left to an experienced professional who knows exactly what to look for. If you think your business or home may have rodent activity, or just want a plan to keep rodents away, please contact us for a free inspection.

Versa-Tech Pest Management specializes in excluding and preventing rats and mice from getting into homes. To get rid of rodents in your San Dimas, Los Angeles County, Northern Orange County or surrounding home or business, call today for your free pest inspection and estimate.

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