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

Avatar for CSZ Construction
CSZ Construction
4.6(
69
)
Addition to Existing Structure - Build

Serving Mountainside, 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 Mountainside, 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
1 neighbors recently requested a quote
Recommended by66%of homeowners
Avatar for Indigo Construction Co.
Indigo Construction Co.
5.0(
24
)
Addition to Existing Structure - Build

Serving Mountainside, NJ and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Emergency services offered

"Our experience with Indigo Construction was very pleasing. They recently completed major repairs in our home, and we couldn’t be happier with the experience. The owner, Ryan, was incredibly professional, honest, and easy to work with from start to finish. His communication was excellent, and the quality of craftsmanship was outstanding. Ryan and his team paid close attention to the details and left everything spotless when the job was done. We highly recommend Indigo Construction and will absolutely be using them for all our future projects!"
Doors Project
Remodeling - Kitchen & Bathroom Project
Buena Vista
N. Mich
Remodeling - General Project

+64

Response time1 day
Response rate100%
4 neighbors recently requested a quote
Avatar for Waxtel LLC
Waxtel LLC
4.9(
109
)
Addition to Existing Structure - Build

Serving Mountainside, NJ and surrounding areas

Approved

In business since 2016

Free estimates

Warranties offered

"Some delays due to being in a "Co-op" building, needed paper work to be filed. The project when well. Total remolding of kitchen, and electrical up-grades in apartment. Would recommend them."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+30

Response time9 hrs
Response rate100%
2 neighbors recently requested a quote
Avatar for Gomez Vision Construction, LLC
Gomez Vision Construction, LLC
4.4(
81
)
Addition to Existing Structure - Build

Serving Mountainside, NJ and surrounding areas

Approved

In business since 2010

Free estimates

Emergency services offered

"Jorge and his brother (Edwardo) of Gomez Vision Construction are 2 of the most hard working, honest, talented contractors anyone could hope to find. Extremely reliable and responsive. They listened and were very willing to modify things to meet our needs. Did an outstanding job feathering in new and existing hardwood flooring along with a full kitchen gut and remodel. Very fair pricing I would recommend them without reservation. We will be using them again for a bathroom remodel."
COMPLETE HOME REMODELING
job#387 house renovation
job#391
master bath
hard wood refinishing

+326

Response time3 hrs
10 neighbors recently requested a quote
Recommended by84%of homeowners
Avatar for JM Construction  and  Remodeling
JM Construction and Remodeling
4.4(
23
)
Addition to Existing Structure - Build

Serving Mountainside, NJ and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

"Mike did a fantastic job! I initially reached out to him to paint an apartment and wound up having him also replace a kitchen and renovate a bathroom. Both results exceeded my expectations! Great attention to detail."
Kitchen Renovation
Kitchen Renovation
Kitchen Renovation
Kitchen Renovation
Kitchen Renovation

+9

3 neighbors recently requested a quote
Recommended by73%of homeowners
Ernest & Sons General Contractors
4.1(
23
)
Addition to Existing Structure - Build

Serving Mountainside, NJ and surrounding areas

Approved

In business since 1997

Customers say: Quality work

"It went extremely well. They knew what they were doing. When something went wrong they took care of it. They were punctual. They showed up when they said they would. They were clean and didn't leave any trash. We were extremely pleased with them. The retaining wall 8 feet high and 90 ft long. I would highly recommend them."
Additional Photos
Additional Photos
Additional Photos
7 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for Home Quality Remodeling
Home Quality Remodeling
5.0(
7
)
Addition to Existing Structure - Build

Serving Mountainside, NJ and surrounding areas

Approved

In business since 2004

Free estimates

Warranties offered

"Home Quality Remodeling took such great care of us with our project. We had a pleasant experience with Jacob, he is organized and professional. We will definitely return to them for future projects."
3D Bath Design
3D Luxury Shower
3D Custom Bathroom
3D Grey Modern
3D Bath & Storage

+59

Response time1 day
Response rate100%
12 neighbors recently requested a quote
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FAQs for addition to existing structure building service projects in Mountainside, 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 Mountainside, 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.