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Before and After Pictures from Princeton
Bat's find easy access to Princeton, NJ home

Bat's find easy access to Princeton, NJ home

Before After
Bat's find easy access to Princeton, NJ home Bat's find easy access to Princeton, NJ home

This homeowner in Princeton, NJ found herself with bats nesting under the fascia leaving guano (the excrement of birds and bats) deposits all over the deck. Bat guano happens to be an excellent organic fertilizer because of its high nitrogen and phosphorus, but it is also a health hazard. Bat and bird guano can contain numerous pathogens including  a fungus that causes histoplasmosis, a serious chronic lung disease, and exposure, Including breathing in these airborne particles, is dangerous for homeowners. Also, bats are major carriers of rabies. Bat infestations need to be removed and professional experienced in excluding bats from nesting in your home should be brought in. This is not a DIY project and you should not be working in a bat-contaminated area without proper protective equipment. For this home, I completely covered the fascia with a metal barrier to keep them from roosting in and between the fascia board.

Dirty, dusty crawl space shines in Lawrence Township, NJ

Dirty, dusty crawl space shines in Lawrence Township, NJ

Before After
Dirty, dusty crawl space shines in Lawrence Township, NJ Dirty, dusty crawl space shines in Lawrence Township, NJ

Recently, homeowners in Lawrence Township, NJ in Mercer County contacted Cowleys to upgrade their dirty, dusty crawl space. Crawl spaces are perhaps the most ignored areas of a home. They can also be fraught with problems that can affect the living spaces above. Dirty crawl space air circulates throughout the home, so even if you don’t see what’s going on down there, the crawl space in a very real way is visiting you on a daily basis. Crawl spaces are also notorious for high indoor humidity levels, for mold growth, and their damp, dark environment attracts insects. Many homeowners deal with pungent smells and poor indoor air quality because of problem crawl spaces.

This homeowner was bothered that there was a filthy area right below their first floor and decided it was time to do something about it. Cowleys has an experienced contractor crew that can improve crawl spaces in a variety of ways, up to and including the installation of a full CleanSpace encapsulation system. Crawl space encapsulation seals off the outdoor elements that can trigger all sorts of problems. Even if you don’t see puddles of water in your crawl space, ground soil is naturally saturated with water. By definition, any crawl space with a soil floor is damp and filled with moisture most of the time. 

For this homeowner, we installed thick mold-resistant drainage matting to create a barrier between crawlspace and floor, a primary entry point of unwanted groundwater.  We wrapped the walls with SilverGlo wall insulation, an Expanded Polystyrene Foam (EPS) product coated in a mold-resistant aluminum and put protective warping on the crawl space pillars as well. Finally, we put in a heavy-duty 20-mil CleanSpace vapor barrier. Our vapor barrier is much thicker and sturdier than a regular liner, and we mechanically fasten it to the walls. When, on occasion, you or a repair person need to access your crawl space, the barrier will not pull off or tear.

Once we completed the installation, these homeowners now benefitted from a home with a clean, improved crawl space. This home improvement will make their home more comfortable for the family, improve the indoor air quality, and reduce the risk of crawl space mold growth. For these homeowner, an added benefit was that their crawl space could now be used as a much-needed clean and dry storage area. 

Eliminating yellow jackets in Princeton, NJ

Eliminating yellow jackets in Princeton, NJ

Before After
Eliminating yellow jackets in Princeton, NJ Eliminating yellow jackets in Princeton, NJ

Recently, I was sent to a homeowner in Princeton, NJ who was having a problem with yellow jackets. It’s bad enough when you see these nasty stinging insects flying around outside your home, but here, it was even worse. They had made their way inside one of the downstairs rooms.  

I needed to determine how they were gaining access inside the home, and start with an exterior perimeter inspection. I observed yellow jackets flying in and out of an opening in the siding. Yellow jackets are ground-nesters. They usually build nests inside cavities. Often, we find them in hidden locations such as rodent burrows, behind bark, or in hollowed-out  stumps. They also make use of man-made structures and will build their nests attached to eaves, or like here, behind siding. Yellow jackets are strong, hardy insects that are powerful enough to chew through drywall and even plaster, so they can make their way from wall voids into the living areas of home, a frightening experience for any homeowner, to say the least. These yellow jackets were likely nesting up in a ceiling or in a wall void, and a mature nest can grow to be quite large with several thousand members.  The little bit of good news was that, according to the homeowner, no one in the household was allergic to wasp stings. Nevertheless, yellow jackets are aggressive, territorial wasps. They often sting without provocation, and their stings pack a wallop. It was important to have this infestation resolved quickly.

I treated the opening with a highly effective dust that will be carried back by the foraging wasps to the nest, spreading throughout. The residual dust will continue to work for months, killing any emerging wasps. This hidden nest should be completely neutralized within a day, and this family will no longer have to worry about these stinging insects. 









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We're very happy to announce that our Office/Production Manager Jill Esposito is celebrating her 15 year anniversary at Cowleys! "Jill... [Read more]
Cowleys Selected as The Best of 2020 Farmingdale Award for Pest Control
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Pest Control Services in Princeton, NJ

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Reviews From Princeton
Testimonials From Princeton
We were hearing scratching and scampering sounds upstairs at sunrise and sundown and thought we had a squirrel problem. The wildlife technicians, Stephon and...
Testimonial by Sam M. from Princeton, NJ

Princeton, NJ Expert Pest Control Company

Here at Cowleys Pest Services we not only adhere to the highest pest control standards, our goal is to provide you with an excellent experience and service in Princeton and nearby NJ.

From your first phone call through treatment and follow-up we at Cowleys Pest Services pledge to give you great customer service while fixing your pest problem.

Since 1991, we have been treating a wide variety of pests, bedbugs, insects and rodents -- just contact us to get more details on your home or building's issue. Take advantage of our expertise to get rid of unwanted pests or animals in your Princeton, NJ home.

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At Cowleys Pest Services we also have pest control plans where we routinely inspect your home or building and apply needed solutions ahead of developing a recurring pest problem. Our pest service plans have different levels too, to best suit your needs that you can change over time if needed. From our Green Service Plan to our Platinum Service Plan, we'll keep your home pest-free.

Business & Home Pest Services We Offer in Princeton:

  • Bedbug Extermination
  • Flea Control
  • Termite Control
  • Pest Control
  • Exterminators
  • Rodent Control
  • Ant, Beetle, Spider, Insect Control
  • Tick Control Services
  • Pest, Bird and Animal Control Services 
  • Attic Insulation Services
  • Gutter Guards
  • Crawl Space Encapsulation
  • Expertise and Technical Know-How to Fix Your Pest Problem
  • Financing Available
  • Written Estimates and Inspections
Case Studies From Princeton
A homeowner in Princeton, NJ, had ongoing water intrusion and humidity issues in his crawl space, and he was concerned, rightly so, that these water...
I was dispatched to one of our commercial properties, an apartment complex in Princeton, NJ that contacted with Cowleys to handle all of their pest...
I was recently sent to a home in Princeton, NJ to treat a termite infestation. This particular home was built on a slab foundation. Some types of...
Job Stories From Princeton, NJ
Yellowjackets Buzzing About in Apartment Building in Princeton, NJ

One of Cowleys commercial accounts, an apartment building in Princeton, NJ, is serviced by me weekly to handle any pest complaints of tenants or property management. I have treated a panoply of insects there, from occasional invader insects like clothes moths and pantry pests to our “regulars” like carpenter ants & bees and all types of stinging insects. On my to-do list this week was a call from the property manager that a large yellow jacket nest was discovered in a utility room attached to the main apartment building. He had no idea how long the nest had been there or even if it was still an active nest. Since the room was not heated, I suspected that it was an inactive nest. But with yellow jackets, you don’t take any chances!

I cautiously proceeded inside the utility room and looked around to see if there were any yellow jackets hovering about. The coast was clear. There was not a single yellow jacket and given the size of this nest, this small utility room would have been an airport of yellow jackets flying about. 

I used a putty knife to scrape the nest off the wall. This was an exceptionally mature nest. Had it been active, this colony would have had at least a thousand ornery yellow jackets. This was one time I was glad we were in the middle of winter when stinging insects are generally dormant, although on rare occasions we can find an active nest built inside a heated building. After removing the nest, I inspected the outside of the utility room to locate the entry point for these insects. There was a small gap in the siding where a small aluminum box was attached. The box was bent providing enough of an opening for the insects to come and go. I let the property manager know that the box needed to be replaced or at least sealed against the siding. As long as there was a gap, there was a risk of re-infestation — something I would prefer to not deal with once the temperatures start warming!

Yellowjackets Buzzing About in Apartment Building in Princeton, NJ - Photo 1Yellowjackets Buzzing About in Apartment Building in Princeton, NJ - Photo 2
Hornets Terrorizing Residents in Princeton, NJ Community

During the summer, I perform a weekly servicing for a residential community in Princeton, NJ. The property manager informed me of my top priority for the day: I needed to take care of a hornet’s nest that was terrorizing residents by the swimming pool!  Upon inspection, I immediately saw the problem. The nest had blended in perfectly with the tree and,  even though this was a mature, large nest, it was well hidden unless you were really looking for it. A few residents had already been stung because they didn’t see the nest and made the mistake of venturing too close. Pools tend to be a problem with wasps because they are attracted to the food and sugary sodas.

Often, I can tell the wasp species based on the construction and location of the nest. With this wasp nest removal job, I immediately knew that I was dealing with baldfaced hornets. These “hornets.” contrary to their name, are actually a type of wasp. They are close relatives of yellow jackets and have the same nasty disposition. Baldfaced hornets usually build their nests in hidden protected locations, often under the eaves of buildings or hidden away in some corner of the home, Also, like here, you’ll find baldfaced hornet nests built in or trees where the nest is hidden by leaves and branches. They make their egg-shaped nests out of chewed wood and their saliva, and these nests can grow quite large — approaching the size of a regulation basketball! During the summer, a colony can easily grow to several hundred workers.

These wasps are distinctive white markings on their head and body, and they are social wasps that live in colonies. Social wasps are aggressive and territorial. They are very protective of their nest if they feel threatened, and they won’t hesitate to sting. Each wasp is capable of stinging repeatedly. 

Removing a baldfaced hornet nest is a challenge, and doing it the wrong way or not having the right equipment can easily turn into a medical emergency. These wasps attack in swarms, and aggravating the colony can send hundreds of angry wasps in your direction. Just one wasp sting is painful, but multiple stings are a level of pain that you’ll never forget. I’ve been stung by these even wearing a protective suit. 

It was time to get rid of the nest. First, I treated the entry and exit holes with an aerosol that kills the hornets on contact. I wanted to get rid of the nests' first line of defense — the wasps that are guarding the nest’s exterior. I soaked the nest with the aerosol, to quickly knocks down their population. Even though there may be a few more around, it is now safe enough for me to remove the nest. After removing the nest, I packaged it and took it with me. I did not want any remnants of insect activity since these wasps tend to be attracted to the same area. These wasps had already overstayed their welcome at the pool and I wanted to make sure that these wasps had no attractants that would encourage them to return. 

Hornets Terrorizing Residents in Princeton, NJ Community - Photo 1Hornets Terrorizing Residents in Princeton, NJ Community - Photo 2
Yellowjackets high up in Princeton, NJ

I was servicing a regular client in Princeton. I went directly to the unit that was having the issue with the yellowjackets. The resident was even seeing the stingers in her unit. I inspected the exterior and quickly found a nest in the roof sheathing by the gutter. I proceeded to treat the opening with a dust insecticide. 

Yellowjackets high up in Princeton, NJ - Photo 1
Citronella ants invade Princeton, NJ crawl space

Cowleys received  a call from a Princeton homeowner who had been seen “a small army” of  yellow ants in his crawl space and all over the vent cover leading into the crawl space. These particular ants are citronella ants, and get their name from the citronella odor that they emit when threatened or crushed. These ants feed on the excretion of aphids and mealybugs that feed on the roots of shrubs, and the swarmers (winged ants), which are much larger than the workers, are frequently confused with termites.

Upon arrival, I inspected the crawl space and immediately came across a customer DIY moisture barrier. Unfortunately, weekend handyman projects usually don’t have the same results as professional installations. That was clearly the case here. The crawl space was humid and filled with moisture, and this barrier, a jerry-rigged tarp, was doing little to stop moisture and humidity from entering the crawl space. Upon further inspection, I noticed citronella ants surrounding the outer areas of the tarp. I rolled up part of the tarp, which was loose, to better inspect the area and observed numerous citronella ant trails criss-crossing the crawl space.

I treated the crawl space as well as the exterior of the home. In addition, I spread a granular bait that the ants will pick up and bring back to the colony, killing the queen. With the queen dead, the entire colony will soon eliminated. Killing a few foraging ants will not stop the infestation. To successfully resolve an ant or other insect infestation, you must kill the colony. 

Citronella ants invade Princeton, NJ crawl space - Photo 1
Work Requests From Princeton, NJ
Project Location: Princeton, NJ
We have small white moths in our home
Project Location: Princeton, NJ
Hi. I saw a bit of frass by a tree in the front yard and some carpenter ant activity.
Project Location: Princeton, NJ
Bee hive in wall/attic
Project Location: Princeton, NJ
Some carpenter ants inside the house. Also interested in maybe a yearly plan for spiders, silverfish, etc
Project Location: Princeton, NJ
We have seen snakes living in the rock waterfall that serves as the filter supply return to our pool. Concerned they are nesting in the crevices and hoping to have them removed and deterred from returning. Not sure of type of snake. Have also found skin in basement.
Project Location: Princeton, NJ
Want to make sure that there are no termites.
Project Location: Princeton, NJ
I hear rodents' sounds in one room of my home (single family). Not sure if this inside the wall or on the roof, this sound is intermittent, not on daily basis, and once heard, it's always during late night or very early morning. also not sure about the nature of this rodent if it's squirrel or something else.
Project Location: Princeton, NJ
Bat in house
Project Location: Princeton, NJ
Evidence of mice and insects in attic. evidence of mice in basement. want to treat and seal.
Project Location: Princeton, NJ
We are hearing scampering noises in the attic in the evening. That part of the attic (over a dormer) is not accessible from inside the house. We live in a wooded area and there are many squirrels in our yard. Some might have climbed up the drain pipe and chewed the soffit to get in.
Project Location: Princeton, NJ
We seem to have a mole problem according to our landscapers
Project Location: Princeton, NJ
We live in a town home and have heard critters in the attic/walls. I've set traps in the attic and have caught a mouse, and today saw a mouse on the outdoor patio run up to the side of the house and slip under the siding. We'd love it if you can help us get rid of the mice in the attic and walls, and help check to see where they're getting in from outside and plug up the holes. Thanks!
Project Location: Princeton, NJ
Squirrels starting to build a nest in the eaves of a porch
Project Location: Princeton, NJ
Have identified flying squirrels in the wall of the second floor....
Project Location: Princeton, NJ
A recent home inspection for a property we wish to purchase indicated the presence of carpenter bees. We request an estimate for this along with your first availability to treat these, and any other detected pests.
Project Location: Princeton, NJ
Flying squirrels in the attic. Saw one in my house
Project Location: Princeton, NJ
Hello, my wife has woken up with more than 10 bites several times now, and I would like to know the cost of a K9 bed bug inspection.
Project Location: Princeton, NJ
Groundhog service
Project Location: Princeton, NJ
Groundhogs eating all the veg and flowers!
Project Location: Princeton, NJ
There have been a lot of ants in our kitchen these days. We are not sure what kind of ant they are. Some of them are black and some of them are yellow. Most of the ants are found in the kitchen and there are few in other parts of the house.
Serving the following Princeton, NJ zip codes
08540, 08541, 08542, 08543, 08544, 08540, 08541, 08542, 08543, 08544