Customer Testimonials

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At first, we didn't know what to think. We starting hearing scampering noises above the ceilings of our second floor. There are woods behind our house in Columbia - trees that are home deer, fox, raccoons, squirrels, rabbits, mice and all kinds of birds, little ones and big ones too. There are days when it's a veritable Disney movie out back and on our deck.

Thinking a squirrel or something else was nesting in our unfinished attic, we called Howard County Animal Control. They, in turn, gave us the number for Mark Cohen's At Once Pest Control - with the County's assurance that they were licensed to handle the animal control problem we were experiencing.

I called Mark. He and one of his associates came out quickly, went into our attic, got on the roof where they found and later fixed a soffit entry point. It took two visits, but they got the job done, very effectively and affordably. And their service is guaranteed for a year in case something comes back so we don't have to worry about that.

Consider Mark Cohen's At Once service highly recommended.

-Les Cohen (No relationship to Mark.)
Columbia, Maryland
Columbia, MD
January 26, 2016

Marc thank you SO much for coming out so quickly to "rescue" me from the 4 ft black rat snake I found in my basement. You and your team came out so quickly and took the time to check and treat the exterior of my home. I am so grateful for the respectful and prompt service. I hope to never find another snake in my home, but I DO know who to call now if I do.
Ellicott City, MD
October 9, 2015

After 6 failed attempts from another company to get rid of bed bugs, we contacted At Once Pest Control. Marc made a special trip out to our home to assess the situation. We were put on the schedule immediately. It has been 3 weeks since our treatment and we are bed bug free. I would highly recommend this company. Marc was very helpful and wanted to make sure that our problem was resolved. Don't waste your money on chemical treatments for bed bugs, trust me. I wish I would have gone with the heat treatment first.
Glen Burnie, MD
September 15, 2015

Wow! When it comes to pest control, Marc Cohen is the only man that I will ever call for help. Marc came to our rescue when we realized that we had not one, but two unwanted pests in our home (bed bugs & cockroaches!) He showed up almost immediately after calling him and gave us an honest assessment on our situation. He went over the different options that we had, which also included a heat treatment (other companies did not offer that service.) Marc was not only knowledgeable and helpful, but he was very genuine as well. When it comes to pest control, At Once is the best of the best!
Baltimore, MD
June 23, 2015

At Once Pest Control is the best company. Marc is truly the ultimate professional. I had a squirrel problem in my attic. I purchased a new rehab house in August 2014. By Feb/March/April squirrels somehow chewed their way into my attic. I was horrified and couldn't sleep at night. I found out about Marc's company from a neighbor who had used their services for a similar problem (squirrels/birds) entering her attic. I call them and Marc arrived the next day with his assistant. They had all their equipment including ladders. He immediately inspected the situation to see where the entry points were. The squirrels had chewed throught the gutter in the back of my house. Marc and Chris set up traps and within a couple of days. Two squirrels were caught. Marc came out and removed them immediately. Today he's coming out to remove the traps and complete the job. I feel 100% satisfied. I would recommend Marc's company (At Once Pest Control) to anybody. He know's what he's doing, very professional, calm demeanor and very reasonable. I can finally sleep at night. Thanks to Marc.
Ednor Gardens Lakeside
April 9, 2015

At Once Pest Control was exactly what I was looking for. We have experienced a landlord's nightmare: bedbugs. Mark Cohen (owner) was quick to respond. The heat treatment he recommended did the job! I had used other companies that used chemical treatments only and the bed bugs were still alive and well after 1 1/2 years of treatment!!! And the bugs had spread to 4 apartments.

At Once Pest Control treated with heat and chemicals. After 2 years we are still bed bug FREE!!!

I called Mark right away when another one of our rentals (a townhouse) got bedbugs. He was again quick to respond and left the house bug free!!

His pricing is VERY affordable and his treatment is effective. I strongly recommend him and his company.
Carroll County
March 10, 2015

Mark is extremely responsive and knowledgeable. He is available at all times and even responded to help us with a tricky snake issue on a holiday. We will use At Once Pest Control for all pest issues in the future.
Lutherville, MD
October 4, 2014

Mark was such a breathe of fresh air. He was honest and forthright about what he saw (second opinion) and saved us a ton of money. I can't even begin to tell you what peace of mind this brought to our family since we had been told it was bed bugs when it was not! He came when he said he would and drove a long way for this. We are most appreciative.
Bel Air, Md. 21014
September 20, 2014

We are very thankful that you came to our house even it was after your working hours. Your knowledge about snake and other bugs was great. Thank you we feel relax after your visit. Great service and highly recommend to everyone.
Perry Hall
June 18, 2014

I freaked out when a bat flew across my head and landed on the wall in my basement laundry room. I quickly proceeded to close the door did some internet reseach on who I could get to come out and take care of the problem. I got Marc's number from the Maryland Dept. of Natural Resources Nuisance Wildlife Control Cooperators. He explained how the bat could have gotten into my windowless basement and possible courses of action. He came out that night and thoroughly investigated the basement as well as my attic and assured me the bat had exited the building and there was no indication of infestation. He charged me next to nothing and left me with his information if I should experience other problems. I will definitely call him again if the need arises.
Reisterstown, MD
June 12, 2014

We had another company do treatments before at once pest control, and their treatments did not help. It seemed like it got worse. But at once pet control came out once, did a heat treatment and we have not seen any bed bugs since they came out. I would highly recommend this company, they were very professional when it came to making sure all were gone. I give them 5 stars and more. Also they were very kind, and treated my house like it was their own. Thanks at once pest control. :)
Parkville, MD
February 24, 2014

Mark was extremely helpful in our initial conversation. He is clearly out to find the best option to remediate an infestation issue, not to simply charge for a service that may or may not work. So much so that he recommended I wait to utilize his services. I will certainly be contacting at Once if and when I require pest control services.
Fells Point
February 21, 2014

While performing renovations on the house next door to us, the new owners noticed bats flying from our home. Not having any experience with bat removal, I turned to the Internet and found At Once Pest Control. I called and Marc came out the next day and confirmed that we indeed had bats but they hadn't entered our living area yet. He scheduled one of his men to come out the next day to begin the process of removing the bats and ensuring there were no other entry points in our home. One week later, we were bat free. The cost was much less than we anticipated and we received a 5 year warranty. I could not recommend At Once Pest Control any more highly. Very knowledgeable and thorough. We are extremely pleased with the service they provided.
Lansdowne, Md.
August 19, 2013

I have very bad problem with bed bugs in my house. I call Mr Cohen He come to my house He did a very good job. I am happy with his service is no more any more bed bugs.
Columbia, MD
August 2, 2013

After trying who knows how many "sure fire" methods of getting rid of those nasty pests (with nothing working), I called Mark, and after one treatment, I live a life that seems to be a miracle! We can sleep a whole night without those bugs biting us, keeping us awake. These guys know what they are doing, and best of all, they know how to do it! I recommend you to throw away those spray bottles, drying cloths, and especially that Fabri-Clear stuff, and get serious! Call Mark. Your problem will be gone!
Parkville, Md., 21234
July 15, 2013

Thank you for coming to our house on Memorial Day to serve our pest control needs. We appreciate your dedication.
Timonium MD
May 27, 2013

I would like to thank you for the good job you have done at my family's home, where I take care of my disable sister and another family member. I was devastated when I discovered there were bed bugs in the house. The first call to at once gave me a peace of mind. They explained to me clearly what needed to be done. Following their instruction allowed them to do a professional job. I will recommend them anytime, thank you.
May 3, 2013

If you have bed bugs, don't waste your time with chemical treatments. At Once came and heated up our house and got rid of our bed bug problem fast. They are very professional, thorough, and clean up when they leave. They give a warranty and will come back and treat again if necessary. It is so great to be rid of this awful problem without the use of chemicals and several treatments. I am very happy with their great service. I highly recommend them. If you have a bed bug problem and you are reading this don't spend another night being food for the bugs. Call them now..
Baltimore, MD
July 15, 2012

I currently own or manage more than 30 units in Baltimore City. I got a panicked call from a tenant that she had bed bugs. I called At Once Pest control and we scheduled a treatment for the next day. I had two choices for treatment and chose to use the spray and heat option. My tenant was thrilled that evening. There were three houses on this block that were infested and one landlord had already treated his house twice. It has been two months since the treatment and we have had no issues. I now call them for all my pest control issues.
Baltimore, MD
August 20, 2011

We are so thankful for helping us take care of our rat problem. The rats got out of control because of excessive bird feeding our neighbor was doing in his back yard for years. There were so many rats, we were afraid to go outside at night. After only one visit the rats were gone. Great work!
Reisterstown, MD
July 3, 2011

After many months of sleepless itchy nights, I realized I had bedbugs. After researching online and getting several estimates, At Once Pest Control had the best plan and the most reasonable price to get rid of the problem. I chose Heat Treatment to guarantee that every bug was killed. I found that sprays and powders don't reach the tiny cracks where they hide, and they always seemed to reappear. At Once came out quickly, did the treatment in one day, and I've been bedbug free ever since. I only wish I would have called sooner.
Owings Mills, MD
February 7, 2011