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Top-Rated Addition to existing structure builders in Mahwah - Updated Nov 2026

Avatar for BUILT-WELL BUILDERS, LLC
BUILT-WELL BUILDERS, LLC
4.8(
167
)
Addition to Existing Structure - Build

Serving Mahwah, NJ and surrounding areas

Approved

Super Service Award Winner

In business since 1980

Free estimates

Warranties offered

"The best! Keith, Hank, Michael and Grant were a pleasure to work with over the course of several months last year. I have dealt with many contractors, both personally and professionally, and I can tell you that they should be your first call on any project. The work was done on time and on budget. We added some things to the project, but in no way did they push us to add a single additional item. In fact, we added a complete rebuild of the deck after the project had begun and there was no premium on the additional cost as compared to other contractors who know they have a captive audience. They were present at the property nearly every single day of the project, including Saturdays, as opposed to other contractors who simply give the work to subcontractors and check in once or twice a week, at best. In other words, they know what is going on at all times and are able to give guidance and direction to the subs, and us, on site. They are also more than willing to listen and make any adjustments without crushing you with additional costs! And, they actually work and work hard (especially through the brutal, brutal summer heat last year when we lost our air conditioning for a couple of weeks). I have known Keith and the crew for many years and there is nobody else I would trust to complete such an extensive project which included: completely new roof, all new siding, replacement of every single window in the house (which Keith, Hank, Michael and Grant) did personally, new addition (which included replacement of primary first floor structural beam), new primary bath and primary closets, new flooring, whole house painting including ceilings and more. Lastly, they don’t bite off more than they can chew which sets them so far apart from every contractor we have ever dealt with. Personal touch, presence, attentiveness and excellent workmanship. Highly recommend!"
Response time2 days
1 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for CSZ Construction
CSZ Construction
4.6(
69
)
Addition to Existing Structure - Build

Serving Mahwah, NJ and surrounding areas

Approved

In business since 1998

Free estimates

Emergency services offered

"My parents and I live in a old brick apartment building in Hoboken that is from the 1880s. The bathroom in our apartment had not been updated since the 1940s. We needed help ASAP. We checked out Cesar s page and wanted to hire him immediately. The reviews speak for themselves. When he came into our apartment to give us a quote we knew that this was contractor we needed to get the job done. Cesar is affordable, friendly, and very accommodating to any issues or concerns you have before starting the project. Two massive issues with our project were that my dad has spinal & walking issues, so we needed the floors clear of all tools and materials at the end of the each day so that father could walk efficiently through the apartment. The other big issue was that we only have 1 bathroom, so Cesar agreed to work with us on pulling the toilet off and on as every day finished so that we did not have to leave our building to use the toilet. Him and his crew are the best and take pride in their work so that owner is happy with the final result. We brought the bathroom down to the bare bones and rebuilt it back up. I worked with him every step of the way to make sure that he needed all materials to get the job done in the time we needed. This project was an intense remodel with some of the hardest demo and substrate materials that an old bathroom can have. He didn t think anything of it. He has veteran experience in the field and this remodel only took 3 weeks. We are very impressed with Cesar s craftsmanship and professionalism and we will be hiring him again for any future interior projects."
 ALL COLUMNS FINISH
OLD DECK
Livinroom
 PAINTING
PREPARING FOOTINGS

+168

Recommended by93%of homeowners
Avatar for Prestige Design & Build Corp.
Prestige Design & Build Corp.
5.0(
40
)
Addition to Existing Structure - Build

Serving Mahwah, NJ and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"Working with Matt from Prestige Design & Build was an absolute pleasure from start to finish. His professionalism, attention to detail, and passion for delivering quality work were evident in every interaction. Matt and his team transformed our vision into reality, exceeding our expectations at every turn. The project was completed on time, within budget, and the craftsmanship was second to none. Matt's communication throughout the process was outstanding, keeping us informed and at ease. I highly recommend Prestige Design & Build for anyone looking for exceptional service and unparalleled results."
Demarest multiple room remodel
completion of renovation
Addition project progress
Rear addition project
Master bedroom suite

+542

Response time6 hrs
Recommended by66%of homeowners
Avatar for H4 Construction, LLC
H4 Construction, LLC
4.6(
10
)
Addition to Existing Structure - Build

Serving Mahwah, NJ and surrounding areas

Approved

In business since 2017

Free estimates

Warranties offered

"We didnt know what to do with our apartment and our agent recomended this company for renovation of our apartment...experienced people, alaways smiling, super easy to deal with, open and always to the point...they made our ugly looking apartment to super beautiful. Best in the country."
New build
Renovation of 2 bedroom c
large addition
Addition
Large addition

+32

Response time1 day
Response rate97%
8 neighbors recently requested a quote
Avatar for Inson Dubois Wood LLC
Inson Dubois Wood LLC
5.0(
17
)
Addition to Existing Structure - Build

Serving Mahwah, NJ and surrounding areas

Approved

In business since 2005

Customers say: True professional

"We live in a prewar coop building in Manhattan and were in need of a kitchen, living and dining room/den renovation. Because of the limitations in our building, we were not optimistic that many changes could be made that would dramatically alter the feel/function of the space. Inson Wood proved us completely wrong. With his architectural eye and his impeccable design aesthetic we (and everyone who has been here before and after) experiences our apartment as an entirely different living space. Even family members are shocked at the transformation. I think that what Inson accomplished was the product of a few significant factors. First, Inson asks you what you want and seriously considers how you live. If Inson thinks that different approaches should be considered for what you want, he provides renderings of each option so that you can easily visualize and imagine them. Ultimately, Inson respects your preferences and works with them, elevating them to a level far above what you had imagined. Inson uses the highest quality vendors (whom we NEVER would have found) and expertly guides you through choices (note: follow his recommendations!!!)- our walls would never have had dimension and our kitchen backsplash never have been so unique (two examples) if not for the artisans that Inson uses. Inson is also willing to have you be as much or as little involved in the process as you want to be. I did go with Inson to choose many pieces of furniture but realized after a certain point that his taste point made me confident in him choosing much finishing work (ex: window treatments, decorative cushions, which I love) without me. As with all design work, there are always glitches and Inson was extremely responsive and responsible for taking care of those as they came up. We are nothing less than thrilled to come home each evening and enjoy our space, which feels like a luxurious retreat perfectly tailored to us."
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+11

Recommended by100%of homeowners
Avatar for EMILCO Construction, LLC
EMILCO Construction, LLC
4.9(
16
)
Addition to Existing Structure - Build

Serving Mahwah, NJ and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"I am very impressed to deal with Emil . The work went very professional and fantastic eventhough not completely done 100% but I am sure will come beautiful more than we expected. Very seldom now to find someone honest and professional gives advice to save some money and less money for him. Emil is available seven days a week to answer any question or concern. All crew's working from bottom of their heart like this is their own house with using technology tools to do the Job. I can't thank them enough for what they doing so far .they came yesterday very cold weather to do the work, even my neighbors told me that your construction crew's working every single day. I am highly recommended for anyone who is looking to get professional work with reasonable price and enjoy peace of mind because you are in honest hands professional people worry about their reputation and credibility. I will share some pictures of the work done so far Even though not completely finished. Also I was very impressed to hear a comments from tge rough inspectors personal who came to do the inspection stated that we are like to walk in clean job and people know what are doing good. Infact the inspector asked for phone number to recommended for other people. I will share more pictures after the work completely done ✔"
Remodeling - Kitchen & Bathroom Project
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+21

Response time2 days
1 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Pickford Contracting Services, Inc.
Pickford Contracting Services, Inc.
4.8(
98
)
Addition to Existing Structure - Build

Serving Mahwah, NJ and surrounding areas

Approved

In business since 2017

Free estimates

Warranties offered

"Matt and his team were incredible. In addition to electrical work they also did substantial drywall repair and plastering as well as tiling a bathroom floor. They did wonderful work in a professional manner. Their prices are reasonable and the work is top notch. They were also very considerate of our budget constraints, and made sure to fully explain all of our options to get the result we wanted. I highly recommend them."
building new structure
Original door to be replaced
Shed rebuild
Structure and footing deterioration
Demo

+514

Response time10 hrs
Response rate92%
10 neighbors recently requested a quote
Avatar for The Finish Guys
The Finish Guys
4.8(
20
)
Addition to Existing Structure - Build

Serving Mahwah, NJ and surrounding areas

Approved

In business since 2013

Free estimates

Warranties offered

"Matt built a sunroom addition for us. We met many contractors before finalizing with Matt and we surely feel good about our decision. Matt's best quality is his flexibility. He wants his customer to be satisfied and happy with the project. He is very energetic and shows care and respect to customer's requests. He is very detailed on his quote. Though all may not finish per the details (in the quote), it is built well and per the code. Matt is personable and will spend time with you explaining and answering questions. His crew is professional, he may though hire helpers for smaller tasks of the project. His framing team is excellent. In terms of timeline, these projects always take longer than planned. Most of the delays are due to scheduling township inspections (and re-inspections). Expect some delays due to Matt's team availability due other projects they are trying to finish. I am very pleased working with Matt for our sunroom project. I highly recommend him."
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+20

2 neighbors recently requested a quote
Recommended by45%of homeowners
Avatar for CHARLY'S PAVING & SEALCOATING LLC
CHARLY'S PAVING & SEALCOATING LLC
4.8(
16
)
Addition to Existing Structure - Build

Serving Mahwah, NJ and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"Angelo is great and is willing to go above and beyond your expectations to give you a great look and experience with the contracting job. He is a responsive contractor and if he misses you, he will follow up right away before the job gets started to make sure that all the plans are set. He is present and constantly checking in with the clients and the contracting crew to make sure things are going as scheduled. When the work is completed making sure that everything was to my liking. everything is going well. His team works very well and are focused on the details. They made sure to get all the right materials for the job, to the right of flooring and grout for my shower, to the best kind of paint and the color scheme that works best in a finished basement During a painting job when I asked what works best from a contractors view Angelo gave me a suggestion that made the rooms look even better than I thought it would. He is always working to give you best outcome for any job he takes on. I highly recommend Charles Renovations for any contracting work. Angelo and his team are exceptional!"
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+2

Response time1 day
Response rate100%
1 neighbors recently requested a quote
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FAQs for addition to existing structure building service projects in Mahwah, NJ

You can typically raise your roof by four to eight feet, depending on your home's structure and roof design. The exact amount depends on factors like roof slope and framing support. Raising the roof creates additional interior space, enhances natural light, and increases your home's value. Consult a professional to determine the feasible height increase for your home.

Yes, you need a building permit to raise your roof. Obtaining a building permit ensures your project complies with local building codes and safety regulations. A professional contractor can assist with the permit and inspection process and ensure all legal and safety requirements are met. Your contractor will be familiar with building codes in your area, which can differ between cities or states.

While it's possible to raise a flat roof, it requires extensive structural modifications. Flat roofs lack the attic space and support structures of pitched roofs, so raising them involves significant engineering to ensure safety and durability. This process can be complex and costly, so professional assessment is essential before undertaking a project of this magnitude.

The Mahwah, NJ homeowners’ guide to addition to existing structure building services

From average costs to expert advice, get all the answers you need to get your job done.