Susan K.

“I’ve worked with the good folks at Abacus twice in past few years. They’ve done a great job both times. They take the time to listen to what you want and have the flexibility to be able to make changes and additions to the initial scope of work during renovations. Their pricing is also very fair. I would not hesitate to use them again. I recommend Abacus Builders without reservation.”

Liz M.

“I had to remodel a bathroom and address water damage on two lower floors and Abacus was an incredible partner – even when I was stuck on the other side of the world for the first two weeks of figuring out the plan and materials. Catrina was an amazing help with finding materials and finalizing the contract, and Evan was very responsive and helpful in understanding the problem and dealing with my insurance company. I’ve already signed on to do additional work on my deck with Abacus, and can’t recommend them highly enough!”

Johnna Barry
President – Bridge Property Services

“As the owner of a property management company located in South Boston; we have worked with Mark and the Abacus team for several years on multiple condo building projects, both interior and exterior

Various projects have included replacement window installation & new siding, exterior painting for multiple story buildings, deck repair and replacement and insurance claim restoration project including burst pipe remediation.

Mark and his team are equipped to take on larger projects that include multiples trades and coordination in occupied buildings. The Abacus team has consistently performed and excellent job with reliability and professionalism. Their rate are competitive and their service is outstanding”

Jerry Adler

“We had a fire next door and significant damage was caused to our building. Boston Fire came into our building and knocked out most of the windows and doors to fight the fire, ruining most of the building in the process.

Abacus did an excellent job repairing the building from a pretty miserable state, and made getting the job done just right their highest priority. Mark and Dave are a truly great team. They are thoughtful people, and did a great job on our building. Luis is definitely the guy you want doing your painting – he take the time as if it was his own home. Highly recommended.”

Charles Dougherty
Charles Dougherty

“Abacus recently completed a new deck for our condo building on Beacon Hill after also arranging for replacement of our roof by McConomy Construction. The work was very capably performed. Abacus proved to be that all too rare contractor who did not over promise, did the work that they promised, did it when they promised, and did it well. We would engage them again without hesitation.”

Tara Tarr

“Impressed with the prompt communication and reliability of Abacus. Professional work teams that work with you no matter how small or big the project, show up, get the work done, and clean up well afterwards. Mark’s consistent communication via email made working with Abacus seamless. Thanks!”

Jeffrey Santos

“We contracted with Abacus to help us build a new roof deck on our building in South Boston. During the permitting and negotiation process Abacus was incredibly professional and patient while we worked out the details of what we wanted and ensured everything was done by the books. They truly know how to navigate through various city regulations and zoning restrictions. The construction itself was executed to a high degree of craftsmanship and we are thrilled with the results. The workers always showed up on time and were respectful and courteous. Also, their pricing was very competitive relative to the three other quotes that we received. We would definitely hire Abacus again for future work and highly recommend them to anyone seeking to do any construction / rehab / remodeling.”

David S.

“We hired Abacus to replace our back deck and install new crown molding in 4 rooms, and we couldn’t be happier with the finished product! The whole process was effortless from start to finish. We sent Mark a few photos of our deck and the rooms where we wanted to install crown molding. Within a couple of days we received a competitive quote that clearly outlined the details and costs, so we decided to hire them for the project. Before they started, Mark came out to discuss specific options about the deck and crown molding and helped us make sure we were happy with all of the plans before beginning the work. We scheduled a date and they started exactly when they said they would. Throughout the project the crew was very professional and friendly, and happy to answer our questions. They kept us up to date on project status and when we could expect the next steps to be completed. They had originally estimated the project would take 2 weeks and they did everything in only 6 days! They stuck to their original quote, and in fact, even came in under budget by a few hundred dollars. Every day we came home our house and the building common hallway were clean. The crew did a fantastic job about abiding by our building specific rules about work times etc, they are very professional and respectful. Overall this was the smoothest experience we’ve had with any contractor and wish we had found them sooner!”

Ani A.
Ani A.

“Our association hired Abacus to redo our roof and gutters that was damaged and leaking due to storms last summer. We worked closely with Mark and Darren. Both were very responsive, very detail oriented, and did a great job on our roof. They made sure everything looks and works the way it should and that we were satisfied with all the details. They consulted with us on all aspects of the project which made it so much more pleasant to work with them. Catrina was also very helpful with administrative work such as updating the contract based on new requests we had or changes we did in material selection etc.. Overall we had a great experience working with them and would highly recommend Mark and his team.”

Marcia H.
Marcia H.

“We worked with the great team at Abacus last fall to put a roof deck on our home in South Boston. Mark was very responsive in providing a detailed quote and quickly began the project as soon as permitting allowed. The general contractor on our job was Gerald McGuigan and I truly do not think there is a more patient or reachable contractor in the City. We had a few minor glitches with regard to the length of time it took to complete the project but in fairness some of the delay was due to additions and changes in the design that we made. We are now a year post deck completion and the great team at Abacus continues to respond to our questions and help with minor tweaks. We highly recommend this amazing company!”

Penn Clarke
Penn Clarke

“In November 2015 we purchased an old Victorian single family home in South Boston. Considering it was built in the 1890s this house was a complete overhaul from top to bottom. As part of this reno we also wanted to improve upon the outdoor space, including building a deck off the back of the house, creating easier access to the backyard and adding two roofdecks.

We looked at a couple of contractors, but we were advised by a few people in the industry to go with Mark Little and his team at Abacus because of their attention to detail and their passion for a project like ours. While we knew this was going to be a total renovation down to the studs, we loved the personality of the house and wanted to keep some the integrity of the original design. We didn’t want it to feel cookie cutter and/or just open it up and make it look like so many other places out there right now.When it came down to it, we knew we needed a contractor who understood our own vision, but could also provide additional suggestions and offer up ideas we hadn’t even thought of so we could make this the home of our dreams. After meeting with Mark for a walkthrough at our house, it was clear he and Abacus were the team for the job. From beginning to end, the folks at Abacus made this a positive and memorable experience.

Starting on day one they arrived on time and moved fast. We were shocked at how quickly they completed the demo and also how they would try and clean up at the end of each day – this was a common theme throughout the project. It’s a little thing, but really appreciated as we would stop in from time to time to check on progress. We liked that they were taking as much care with our home as we would if we were doing the work ourselves.

Throughout the process we had clear lines of communication with Mark Little and other key folks on-site (Gerald was a godsend!) which really helped as we had questions or they needed to prod us to get them answers. It was an open dialogue the whole time. And even more helpful is that they couldn’t have been more responsive when we would reach out via text, phone or email. That’s not to say there weren’t occasional hiccups from time to time (this is going to happen on any large scale project like this), but we always talked them through and figured out ways to correct them. The fact that we could promptly talk them through over the phone or in person was really important to us and Mark, as well.

Abacus also helped us stay on track by providing us a list of to-do’s with key dates when they needed answers or actual hardware/appliances in order for us to stay on track. We always tried to do our best to meet their deadlines, but even when we couldn’t they were understanding and kept other project aspects moving so as to stay on schedule.

The work itself was incredibly top notch and can be seen in the attention to the details (both big and small). The tile work, the floors, the custom fireplace, the trim, the decks and roofdeck, even our basement storage area. You name it, they clearly took the greatest care when working on our house. The carpenter on the project built a custom desktop made from pieces of leftover mahogany and it’s better than anything we could have purchased directly from a retailer or vendor. It’s honestly one of my favorite things about the house. That and the main staircase. As mentioned earlier, it was so important that we keep the character of the house intact and this started with heart of the house, the original staircase, including the handrail and large first floor banister. This was no easy task when you consider how old the house was (1890s) and that the staircase extended up three flights to the top floor and also needed to match a new handrail going down to a newly created living space in the basement. Abacus was not only up to the task, but they absolutely exceeded our expectations. It’s the first thing people see when they walk in the house and always comment on how gorgeous it is.

It truly is hard to put into words how thankful we are for the beautiful end product. Just the other day we had someone come in to put up wallpaper in one of the bedrooms and the person said they work on houses all over New England, including a lot of home renovations in South Boston, and she said that you could really tell that whoever worked on the house knew what they were doing and really cared about the project – “The people who worked on this house are true professionals” was her exact quote. And she couldn’t have been more spot on. Thank you Mark and the team at Abacus for giving us the house of our dreams!”

Ali Dudley

“I had a great experience working with Abacus Builders. They built me a beautiful roof deck (including roof access and stairs) in South Boston which is an intense project so I was very grateful to be working with experienced and professional contractors. Mark and his team were extremely thorough, paid close attention to detail and enjoyable to work with. They are not only skilled but they are also very good to their customers so my experience was completely stress free and they made sure everything was absolutely perfect for me before they closed the job. I will use them going forward for all of my contracting needs! I have already referred them to friends and would highly recommend working with them.”

Susan Paradiso

“Mark and crew installed our roof deck. The deck is beautiful, see the St Mary’s deck on his web site. His crew did a great job and installed the deck quickly. Mark is super responsive to email and phone calls. He also worked with us to redesign the door to the deck before construction began, giving us several options to consider.

If you’re considering a roof deck and can’t easily get ideas and information, like happened to me, Mark is a great resource.

I highly recommend them.”


“Abacus was awesome – they did a big renovation for us (kitchen, bathroom, new flooring, etc.) in the exact amount of time that they said they’d do it while also producing extremely high quality work. Sean and Mark were a pleasure to work with – they were extremely responsive and professional. I really enjoyed working with them and highly recommend them.”

Mac Chinsomboon

“I inquired to see if they could swing by and give me a quote for a very large scoped project. He indicated that they were already booked up solid, but did recommend me to call a colleague. I’m happy to see professionals recommend other professionals.”

Kyle Vonruden

“The company was very easy to work with. I was able to speak with the owner regularly. Everyone was helpful and supportive and they were very professional. It was an overall positive experience.”

Jeffrey Lee

“Mark was great from beginning to end. Very professional, right on budget and didn’t even take payment until after the project was done.”

Joe Gugliotta

“Recently purchased the top floor unit on a condoized 3 family in Southie. The builder wanted to build a roof deck but did not get permits in time for sale. Originally wanted simple spiral staircase on back deck going up to roof, but was denied at ISD. Resubmitted with stairs going up back staircase to roof with a roof hatch, was approved.

Had about 10 contractors come out, most not interested in the job. Ended up with 3 usable bids and chose Abacus. Mark Little is very friendly and will explain everything in detail, if you ask.

Built the roof-deck such that its not sitting on the roof, but floating off the roof and resting on metal railings that attach at 4 distinct points. Pointed out roof work that needed to be done due to sloppy installation of siding on house. Negotiated a price directly with his roofer and paid him separately.

Now that deck is done, inspected and Mark’s been paid, he is continuing to help me with minor items relating to the deck.”

Thomas Finnerty

“I am a trustee of a 7 unit, self managed condominium in South Boston. Because it was constructed in 1986, repairs and improvements have been necessitated by the passage of time. I had used other contractors in the past. Since I found Abacus Builders, I always turn to them. They are simply the best by any measure.”

Drew McGillivary

“Mark and the Abacus team are some of the best contractors I’ve worked with. They put in a 600 square foot roof deck for us on time and mostly on budget (other than special requests we made for materials). They’re efficient, timely, and communicative. I highly recommend Abacus for indoor or outdoor projects. Top notch all around.”

Maury Hall

“Mark – I was very pleased with the work that you did for us, especially the tiling. You’ve got a great crew working for you, I really enjoyed them. I’m sure it wasn’t always easy coordinating the different aspects of this job but everything came out the way we hoped.

Thanks again.”

Curtis McSorley

“Thanks Mark. Together my plans, your construction expertise has created a house/home that i will live in the rest of my life. The property is constantly receiving many compliments from the neighborhood.”

Tim H

“Great experience. Mark and the team at Abacus do great work. I feel lucky to have found a reliable and trustworthy, professional to have on my side with respect to work done in the home.”

Elizabeth M

“Contractor was called without prior experience with this company and addressed my concerns of the snow on my roof immediately sending out his workmen within days to clear it. The gutter and stairs were damaged due to the ice/snow and they fixed both issues, the stairs were rebuilt within days and the gutter reinstalled as soon as the weather permitted. I would call Mark without hesitation in the future.”

Joe D

“Mark has been doing work for me for more than 5 years now. I have to say he does exactly what he says he is going to do. He is there when he says he is going to be there, and his men are completely professional and the quality of the work is very good. I would not hesitate to give Abacus my endorsement and hardy recommendation.”

Doris W

“Abacus Builders has done a wonderful remodeling job for my office and met all my expectations with their knowledgeable and skillful services. Everyone was professional and so pleasant to work with. It was a great experience and we would call on Abacus again without hesitation when next we need to update. Their word was their bond.”

Denise P

“Emailed Mark at Abacus to remove ice and snow from my roof. Responded immediately. I could not be any happier with the service we received from Mark and his crew. They worked from the minute they arrived until the job was done.

I was very, very impressed with all aspects of my dealings with Abacus. I highly recommend them!”


“Abacus recently did several renovations on our three family home in South Boston – all of which were very well done. Mark and his team were very professional, fair, always responsive, and did a great job cleaning up after each project.”

Brooks B

“I’ve had very limited interaction with contractors so I didn’t know what to expect, but Abacus was very professional, prompt, courteous, and swift in their work. Arranging a date/time for the work to begin took several back-and-forth conversations over days on account of our busy schedules, but once the time frames lined up the work went quite quickly and smoothly. It was clear their experience showed they knew exactly what to do and how to get it done efficiently. They were very good at making sure I understood what needed to be done, what was going to happen, and confirmed their choices in how to resolve the repairs matched with my expectations. As a homeowner, I’m very relieved to have built a relationship with a firm I now trust and respect. I’ll definitely call Abacus for my future house maintenance and improvement needs.”

Matt & Christian

“Abacus Construction has completed two major jobs on our old house in South Boston. First he helped us complete some major interior work reconfiguring the small bedrooms into a master bedroom and a guest room. He built three closets, replaced three windows including a skylight. He also refinished the old pine floors and drywalled the new rooms. He was careful to consult an engineer to make sure that the walls were properly braced. His carpenters were amazing putting in new trim that matched the old trim perfectly, making sure that the character of the house was maintained.

Secondly, Mark came in to complete an outdoor project for us. When our landscape contractor could not finish the job, Mark came in and completed all of the outdoor carpentry right as winter was approaching. He built a fence with a gate and stairs on a steep hill. He had to work in a tight space around a big tree. He also installed a small fence against the house to create more privacy on our deck and added gutters to our shed for better drainage.

In both cases, Mark’s team got all of the work done on time and on budget. He never raised his price and took great pride in the quality of the work. They left the site clean and tidy. They suggested improvements that would be good for us and gladly did it quickly. We had to move in and had only three weeks to get the interior work done and he made the deadline with no problems. We moved into a fully renovated house in less than a month. In the yard, we need to get the fence and gate up before the ground froze and to protect our house. They finished a day early and everything was perfect. Mark is a truly honest and professional contractor who takes pride in doing a good job and meeting a client’s expectations. We would not only hire him again. We would not hire anyone else.”

Heather M

“Mark took over the project after I had to fire the initial contractor for the incompetence and failure to complete the job in a timely manner. Mark was fantastic. Mark completed the work in the time frame promised at a reasonable price. Through he had many project he was juggling, he made me feel like I was his only customer. I highly recommend Mark Little and Abacus Construction.”

Kevin H

“Mark and the team at Abacus are fantastic. I had multiple bids to renovate a 3 story single family home in South Boston and the Abacus team showed up on sight, walked through my plans and had a quote ready with 24 hours. Mark handled all permits, spoke with the neighbors about the work his team was doing and stayed on time (and most importantly on budget). We had multiple things change throughout the process due to the age and layout of the home and each time Mark was upfront offering a solution to every problem. His entire team was courteous and I had no problems interacting with anyone throughout the entire remodel. We had purchased a faulty tankless hot water heater and the Abacus team took care of the entire process of getting a new one directly from the manufacture and having the plumber come back and reinstall it at no extra cost. During this time when we did not have heat, they purchased a space heater for us. These are the little things that the Abacus team does that do not go unnoticed! I would highly recommend Mark and the Abacus team!”

Paul G

“We have used Abacus Builders for almost 5 years and each and every experience is exactly what you can hope for from a professional and trustworthy general contractor. Mark and his team are fully committed to customer satisfaction by being honest, upfront and addressing all concerns with full attention and responsiveness. I cannot recommend these guys enough for any and all construction jobs.”

Bob M

“This year I was fortunate enough to contract with Mark Little of Abacus Construction to renovate my home. Mark is professional, attentive and detail oriented. I can’t say enough about his dedication to perfection and his accommodating demeanor.

Having dealt with contractors before, I’m used to hearing”…that wasn’t written down” or “that will cost extra.” Prior to signing the contract I spoke with Mark and explained what I wanted. We had a contract but not every detail was included, so as we went along, things arose that weren’t addressed in the contract. Mark was a true gentleman and was always concerned with satisfying me. There was only one extra cost for the entire contract and that was minimal. His business ethics are incomparable.

With regard to the quality of his work, incomparable would be an understatement. There were details that I would never have entertained that Mark pointed out to me throughout the project. His coordination of the project astounded me. Things just went so quickly I barely had time to pack for the move. Mark also was helpful in finding people to help me get other things done that were not within the scope of the contract, like hardwood floors.

Mr. Little is attentive to the customers’ wants and desires. He was always available to answer my questions and meet me to discuss my concerns every time I called. His crews worked well in the the evening hours when necessary, but without inconvenience to the neighbors. They even worked weekends. The project finished on time and on budget.

Abacus Construction and Mark Little… the crews and sub-contractors are professional and the finest crafts-persons around, the work is meticulous and exact, and the service is accommodating and unrivaled. I recommend Mark and Abacus highly, without reservations. I could go on and on and still not do justice to the final product. A picture is worth a thousand words, so please feel free to call me and arrange a time for you to come by and see his fine work. It will ease your mind and make your decision an easy one.
Good luck with your project!”

Catherine S

“At a friend’s housewarming last summer, my husband and I were blown away by how fantastic her home looked. When I mentioned we were considering renovating our home, she could not speak highly enough of Mark Little and his company Abacus Construction.

So, when a few months later we committed ourselves to have new floors put in, as well as a new kitchen and built in Library, he was the first person we called.

Mark was great from the get go. His professionalism was very reassuring as well as his willingness to work within our budget. Besides being well informed, he was very forthcoming with ideas and suggestions of his own, which was very helpful to two amateurs like my husband and I.

Once Mark and his crew started the project, we braced ourselves for the usual “hiccups” people warn about. However, we were more than pleasantly surprised when things went smoothly throughout, i.e. finished on time and within our budget.

Mark is a man of his word. The standard of his work is incomparable as anyone who has been to our home can tell you.”

Holley S

“Mark and Bob saved my business -literally. My original contractor stole over $55,000 from me. Abacus came and promised to get the job done on the original schedule. They worked days, nights, weekends and holidays.The workmanship was incredible. Bob had great ideas and actually helped to improve the original plans (while staying on budget and on time). I asked for many extras and they never said “no”.

I couldn’t have done it without them!”

James O’Donoghue
President – Broadway Land Company

“I have contracted with Abacus for almost 8 years, in that time I have seen their range of expertise grow, in the areas of remodeling to major construction projects, most notably a four story steel & wood frame mixed use development in south Boston, which we are the owner /developer and completed in mid 2007.

This project was especially difficult as the terrain and restriction caused serious technical and angling problems, we could not have over come without the strength and resolve of Abacus. What was unusual about this project was the ability of Abacus to work around an existing building and incorporate some unusual engineering features in to the project.

Additionally Abacus went beyond their scope of work and design by incorporating some excellent design changes and features in to the building. Upon completion and turnover we received a quality product. It is our intention to continue our contracting relationship well in to the future.”

Vincent L

“Abacus builders are a great team and so helpful. They have built up my new custom house beautifully and reliable. This is a company I recommend that you can rely on.

Thanks so much Abacus!”

Gian V

“The service was excellent. I was working directly with the owner Mark Little. He was on time for most part and work was completed to my satisfaction. There was a little paint on screen windows, following the work, but Mark offered to clean them. He also help me assemble and move furniture at a very reasonable rate.”

Stanley C

“Mark’s crew fixed a roof gutter which had been leaking for quite some time. They were able to assess the problem and fix the leak where others had failed. Not a big job but one that could have led to bigger problems.”

John B

“Mark was excellent. Worked well with electrical and plumber contracts. Very responsive and always return my calls. Stayed within budget and one time.”

Kyle V

“The company was very easy to work with. I was able to speak with the owner regularly. Everyone was helpful and supportive and they were very professional. It was an overall positive experience.