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Find Addition to existing structure builders in New Boston

Avatar for iCornerstone, Inc.
iCornerstone, Inc.
4.9(
58
)

Serving New Boston, NH and surrounding areas

Approved

In business since 1988

Customers say: True professional

"My wife and I were looking to have an addition built on our 2 bedroom / 1 bath home back in the winter of 2022. After a phone conversation with Richard, we decided to have him come out to the house. He was very clear with the iCornerstone process, and the benefits of using this process. He is meticulous in measuring and understanding the existing structure. There are no guesstimates and all cost projections are based on the actual materials and labor needed to complete the work. Having such clarity regarding costs before any work begins is not something I've seen in this industry prior to this experience. It was certainly a welcome change. We now have plans for a home addition and complete control over the project. We decide the scope and can customize the plan to our budget. We are grateful to have worked with Richard, and highly recommend him!"
Entertainment center
Entertainment center
Architectural details
computer room left
computer room right

+11

Response time8 hrs
Response rate100%
Recommended by91%of homeowners
Avatar for MMP Construction Inc
MMP Construction Inc
4.6(
222
)

Serving New Boston, NH and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

"We had a very small roof area need to be repaired. I sent request to multiple company to give a service quote. Few of them sent me replies and stated that they are too busy to come. Matt of MMP Consturction's contacted me promptly, scheduled an on-site visit and gave us a quote right away. The work was then scheduled and finished quickly. Matt did great job on reaching out, effective communication, and always arriving on-time. He also gave an evaluation on our roof condition. Also, Eric and Don did excellent job on finishing the project. They are all very polite, knowledgeable, and showed their professionalism. We would like to express our sincere appreciation to Matt and his crew. We are very grateful for having them arriving on-time before the winter storm to prevent potential damage of the house. From their react, we see a warm heart. No job is big or small, all jobs are equally important. Understanding the difficulties of others, for the people, been appreciated by the people. Thank you again for your high quality service. We definitively recommend MMP Construction Inc. to anyone for any related home project."
Additional Photos
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+154

1 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for O'Regan Construction
O'Regan Construction
4.4(
31
)

Serving New Boston, NH and surrounding areas

Approved

Super Service Award Winner

In business since 1988

Free estimates

Customers say: Quick response

"Paul and Jay were a pleasure to work with. We added on a 10x14 addition (dining room) to the house. They were extremely flexible as the design location and final specifications changed several times. The price was very fair and allowed for 2-3 progress payments along the way. Jay's attention to detail in putting the hard wood floor down was amazing as he matched panel to panel from the connecting room. They brought in their contractors for HVAC and electrical ( pricey there ) but that helped us a lot! Highly recommended.. Thanks again Paul"
Completed projects
Completed projects
Completed projects
Completed projects
Completed projects

+254

Response time2 days
14 neighbors recently requested a quote
Recommended by81%of homeowners
Avatar for St. James Construction, LLC
St. James Construction, LLC
5.0(
5
)

Serving New Boston, NH and surrounding areas

Approved

Super Service Award Winner

Free estimates

Warranties offered

Customers say: True professional

"Corey and his team are great to work with. He is a prompt communicator and is very organized. He also has a great attention to detail and ensures the project is perfect before claiming he is done. He is easy to work with and was able to make our ideas a reality. We have used him for several projects already and have him lined up for another. I highly recommend St. James Construction."
Additional Photos
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Additional Photos

+7

2 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Twin Timber Construction
Twin Timber Construction
5.0(
8
)

Serving New Boston, NH and surrounding areas

Approved

In business since 2025

Free estimates

Offers commercial services

"Michael built a single family home in Laconia and his work was thoughtful, tasteful, and overall very well done. He was very responsive and quick to make any requested adjustments. I highly recommend Michael and his team for any renovations, improvements or building a home from start to finish!"
Laconia Custom Home
Laconia Custom Home
Laconia Custom Home
Avatar for Prime Developments
Prime Developments
5.0(
5
)

Serving New Boston, NH and surrounding areas

Approved

In business since 2018

Free estimates

Warranties offered

Whether you are looking to build a custom home from the ground up or expand your current space with an addition, Prime Developments specializes in bringing your unique vision to life. As a leading custom home builder, we design and craft stunning custom homes and high-quality new construction homes tailored to your lifestyle. We focus on budget-friendly new homes as well as high-end luxury custom homes. If you aim to maximize your property’s value and footprint, we also excel in seamless additions to existing homes, custom garages, and in designing modern accessory dwelling units (ADUs). From concept to completion, we combine premium craftsmanship with smart design to create spaces you’ll love for a lifetime.

Project Photos
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Project Photos
Project Photos
Project Photos

+2

1 neighbors recently requested a quote
Jim Yaratz III
3.2(
30
)

Serving New Boston, NH and surrounding areas

Approved

In business since 1988

Free estimates

Warranties offered

"After having numerous contractors not show up to bid or throwing ridiculous quotes our way, we were fed up. I decided to reach out and try Angi. Jim's name popped up, I decided to give it one more shot. We are so happy that we did. Jim was super responsive and came right out to the site. His experience showed immediately. We weren't sure if we wanted to do new construction, a Barn conversion or an addition. Didn't matter to Jim. He was able to quote all variations on the spot! Unheard of with other contractors. We hired him to do a 20x24 family room addition with a full foundation, replace all the existing windows and doors along with new siding and trim for the whole house and addition. His contract was concise with price breakdowns of all phases. He never wavered from his quote or promised timing. His crew consists of family and long time friends. They have tons of experience and it shows in the quality and speediness of their work. I'm still amazed at the precision of the framing. Being an Engineer and machinist, I can really appreciate accuracy. He handled a few change orders with the same integrity. The final project is beautiful and the addition looks seamless. Jim and the crew were friendly, clean and very easy to communicate with. Jim is excellent at explaining all aspects of construction and was always willing to teach me, when I had questions. Couldn't be happier!"
Response time1 day
2 neighbors recently requested a quote
Recommended by77%of homeowners
Avatar for John Wrobleski
John Wrobleski
4.2(
21
)

Serving New Boston, NH and surrounding areas

Approved

Super Service Award Winner

In business since 1998

Free estimates

Warranties offered

"JWC builders are seasoned contractors. They do amazing work! They show up on time, and work throughout the day. The owner of the company, John Wrobleski, was always in contact with me, letting me know what was going on throughout the course of the deck building project. I have hired them for many other jobs as well and they always do an impeccable job! I will definitely hire them again for future projects!"
My Jobs
My Jobs
My Jobs
Our Work
Our Work

+2

Response time7 hrs
Response rate86%
45 neighbors recently requested a quote
Avatar for RD Horizon Builders LLC
RD Horizon Builders LLC
5.0(
2
)

Serving New Boston, NH and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"What really sets them apart is communication and reliability. They showed up when they said they would, kept us informed every step of the way, and handled any changes or questions quickly and professionally. No surprises, no excuses ? just great service and great results. If you?re looking for a remodeling company that is skilled, trustworthy, and truly cares about the outcome of your home, this is the team to hire. We will absolutely be using them again and recommending them to everyone we know."
Full bathroom Remodel
Full bathroom Remodel
Siding
Siding
Siding

+23

1 neighbors recently requested a quote
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FAQs for addition to existing structure building service projects in New Boston, NH

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 New Boston, NH 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.