Learn more about who we are


Charter Oak Building Maintenance, or COBM, has been servicing Connecticut, Massachusetts and Rhode Island since 1988 with a management team comprising over 80 years of experience in Commercial Janitorial Services.

Today we have grown to over 300 employees and are based out of our new 25,000 sq. ft. facility centrally located in Hartford.

As a professional vendor of maintenance services, we have the capacity to approach, monitor and respond to all of our clients' needs on a 24 hour basis.

We are a Minority and Woman owned company certified by both the Greater New England Minority Supplier Development Council and the State of Connecticut Department of Economic Development.

Our experienced team is committed to handling every job, whether large or small, with complete dedication to excellence. Many of our clients have been with us since our start in 1988. That's a tribute to the quality of our services!

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Industries we regularly service include...

Office Buildings
Industrial/Manufacturing Facilities
Distribution Centers
Government Buildings

Banks and Secured Institutions
Clean Rooms
Property Managers
And More!

An in-depth look at what we do

Complete Janitorial Services

Our complete janitorial services include daily or nightly cleaning of floors, bathrooms, trash and anything else we can do to match your specific needs.

Day Porter Services

Our Day Porter Services include a staff assigned to your building to help with day time cleaning to keep your building clean and running smoothly throughout the day.

Complete Floor Care

Complete Floor Care includes cleaning, waxing, stripping, or shampooing of all floor materials from carpets to concrete.

Construction Final Cleaning and Laborers

Construction Final Cleans and Laborers clean up the remnants of all construction projects from medical facilities to apartment complexes.  

Clean Room/ Lab Facilities

We are well equipped and experienced in cleaning lab and clean room facilities where HEPA and ULPA air filters are required.

Medical Facilities

Our team covers multiple large hospitals and medical facilities in the region. We clean all areas including emergency and operating rooms.

Carpet and Upholstery Cleaning 

Our services include deep cleaning of carpet and upholstery furniture.

Acoustic Ceiling Tile Cleaning

Our acoustic ceiling tile cleaning consists of a combination of vacuuming and brush cleaning.

Window Cleaning

We are capable of standard window cleaning as well as cleaning outside windows of multiple story buildings using a boom lift.

Fire/Water Damage Restoration

Our special service crews can respond to emergency situation for cleaning and restoration of fire and water damage.

Apartment Turnovers

We are skilled in providing apartment turnover services as well as general cleaning of complexes.

Snow Removal
(current customers only)

Our snow removal services are a special add-on for our current customers. We don't provide this service separately. 

Light Cleaning and Re-lamping

Our light cleaning and re-lamping services include normal office lights as well as lights in high ceilings ensuring your office always stays bright.  

Marble Restoration and Stone Cleaning

We are capable of full marble restoration and stone floor care including diamond cutting and polishing with diamond pads. 

Air Duct Cleaning

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Our team in action!


Companies we currently service include...

Middlesex Hospital


American Honda


What our customers have to say about us:

I’m so IMPRESSED with Charter Oak Maintenance, we needed something out of the norm this week and I had lost Lydia’s phone number by way of a technical meltdown with my phone so I reached out to the web site to send a message. John replied back to me via email with all the information I needed to call Lydia in less than a minute (not kidding) and then he said he would do the leg work and relay the message to her about what we needed. FIVE STARS CHARTER OAK!!! Thank you for your service we appreciate your attention to detail and you’re professionalism.

- Michelle

I just wanted to say how great the floors looked when we came back from break yesterday! Thank you for completing our requests and resetting the condition of our floors. So far, I think the new night crew member is a great addition to the team! He seems to have a good sense of what is needed and what it takes to clean our space properly. He just might be what we have been looking for.  

- Natasha

I wanted to say thanks to you! The room and the space were spotless for our event! I truly appreciate you and your team and the attention you all gave to the Ambulatory 4th floor area.

- Melissa

The floor in the old food pantry, now Tara’s Closet, looks fantastic. It is so much cleaner than I thought it would get. Your folks did an outstanding job. Thank you so much.

- Joan

Let me also add that the post-storm cleaning of the salt infused vestibule carpeting, and most of the salt-encrusted areas of interior rugs, look to have been specially cleaned/vacuumed/treated over the past few days. They look good!

- Bob

Regarding some feedback I received from an evening RN: She complimented Hugo for helping out the ED staff during a very difficult night with an extremely high census. She said he is always eager to help, does it with a smile, and is becoming part of the team. Please let him know that the extra effort is recognized and appreciated.

- Sheryl

I just want to say Excellent job on the floors! I along with the staff was really impressed with the quality of work that came out. I don’t think I have ever seen our stairwell that buffed.

- Natasha

I just wanted to thank the cleaners- last night they did an awesome job washing the floor in room 6!

- Mary

Thank you so much, the place looks great. Your guys did a great job and are 10 times more professional than I have used in the past with other cleaners.

- Shaun

I would like to thank you for your speedy service in handling all of our concerns reference cleaning tools. Thanks again for your quick and professional response.

- Derek

The floor looks fantastic! Alex and his crew did an incredible job, please pass along my thanks. And a huge thank you to you for getting this scheduled so fast for us!

- Anonymous