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  • Average homeowner rating star icon4.9
    Average homeowner rating
  • Verified reviews icon10
    Verified basement remodels reviews

Top-Rated Basement remodelers in Nelson - Updated Nov 2026

Avatar for Owens Corning Basement Finishing System
Owens Corning Basement Finishing System
4.5(
533
)
Basement - Remodel

Serving Nelson, NH and surrounding areas

Approved

Super Service Award Winner

In business since 1990

Free estimates

Warranties offered

"I couldn’t be happier with the work Owens Corning Basement did remodeling my basement! From start to finish, they were professional, courteous, and attentive to every detail. The team completed the project on time and within budget, keeping me informed throughout the process. The finished basement looks amazing—bright, functional, and exactly what I envisioned. I highly recommend Owen Corning Basement to anyone looking for high-quality remodeling work!"
Media Room Before
Media Room After
Games Room Before
Games Room After
Living Room Before

+128

Response time11 hrs
64 neighbors recently requested a quote
Recommended by69%of homeowners
Tim Gagnon Frame to Finish
4.7(
35
)
Basement - Remodel

Serving Nelson, NH and surrounding areas

Approved

In business since 2008

Free estimates

Customers say: Quick response

"He did an awesome job. The stairs came out just as I imagined. He made basement stairs to meet code. This was not part of the original project request. He was very friendly and professional. He was on time and cleaned up before leaving for the day. I am very satisfied with his work and would hire him again."
closet
mantel living room
stairs and entertainment center
new mantel
new bedroom

+22

Response time1 day
Recommended by84%of homeowners
Avatar for On Task Construction LLC
On Task Construction LLC
5.0(
9
)
Basement - Remodel

Serving Nelson, NH and surrounding areas

Approved

In business since 2022

Free estimates

Credit card accepted

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business. \n \nTrip charge $100 will be taken off the contracted amount once agreement is signed.

Spray foam
Spray foam
Spray foam
Deck build
Deck build

+4

2 neighbors recently requested a quote
Recommended by33%of homeowners
Avatar for Edgewood Drywall Services
Edgewood Drywall Services
4.8(
41
)
Basement - Remodel

Serving Nelson, NH and surrounding areas

Approved

In business since 2000

Free estimates

Customers say: True professional

Edgewood Drywall Services invites you to experience a tradition of customer satisfaction that will exceed your greatest expectations. Our professionalism and quality workmanship will accurately reflect your taste and lifestyle. From conception to completion, we work with you until the job is done. Give us a call for a free estimate!

Projects
Projects
Projects
Projects
Projects

+20

1 neighbors recently requested a quote
Recommended by60%of homeowners
Avatar for DCL Construction
DCL Construction
5.0(
6
)
Basement - Remodel

Serving Nelson, NH and surrounding areas

Approved

In business since 1999

Free estimates

Emergency services offered

"Bob was amazing throughout the entire project. Was very knowledgeable about everything we requested and helped with the planning process from beginning to end. Gave extremely realistic cost and timeframe. Was extremely professional the entire time and always made sure to clean up and it never felt like we were in the middle of a “construction sight”! We were so happy with his work that we are planning more projects. I would not have any hesitation in recommending Bob for a project. You won’t regret it!!!"
After
After
After
After
Before

+38

Response time10 hrs
2 neighbors recently requested a quote
Recommended by66%of homeowners
Avatar for Freedom Framing and More, LLC
Freedom Framing and More, LLC
4.3(
14
)
Basement - Remodel

Serving Nelson, NH and surrounding areas

Approved

In business since 2014

Free estimates

Warranties offered

"The project is underway and will be completed on time. Mathew is very personable and easy to work with. He has kept me informed about every step thus far. I’m looking forward to having our new space completed and ready to use."
Before
During
Wrapping up
Finished
Prep

+34

Response time2 days
Response rate95%
Recommended by84%of homeowners
Avatar for Greater Northeastern Construction
Greater Northeastern Construction
5.0(
3
)
Basement - Remodel

Serving Nelson, NH and surrounding areas

Approved

In business since 1979

Credit card accepted

Offers commercial services

Greater Northeastern Construction is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over 35 years of hands on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today!

My jobs
My jobs
My jobs
1 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for DALLASTRA CONSTRUCTION LLC
DALLASTRA CONSTRUCTION LLC
4.1(
8
)
Basement - Remodel

Serving Nelson, NH and surrounding areas

Approved

Super Service Award Winner

In business since 2014

Free estimates

Credit card accepted

"This was my first time hiring a contractor and I admit it was quite daunting. After meeting with two other contractors and "testing" Dallastra, I felt they were up to the task. Not only that, I was on vacation in Italy while the work was done! Dallastra held to the promise of keeping me updated the whole time. When I returned home I was, and still am, happy with the results. (Dallastra also refinished my wood floors, painted the ceilings on the main floor as well as a couple of other small areas.)"
Bathroom remodeling
Bathroom remodeling
Bathroom remodeling
Bathroom Remodling
Bathroom Remodling

+7

Response time2 hrs
Response rate100%
...
Showing 1-10 of 90
Basement Remodel FAQs, answered by experts

A finished basement does not always count as square footage, as this varies by state regulations. In areas that allow below-grade spaces to be included in a home's official square footage, the basement must typically meet certain conditions. These conditions often include having a functional egress and being a livable space with flooring, finished walls, and temperature control. To be certain, contact your local assessor to confirm your area's specific policies regarding basement square footage.

Living in a finished basement is acceptable, but only if the space has the proper points of egress and includes smoke and carbon monoxide (CO) detectors to ensure the safety of the occupants. A good way to ensure your finished basement is suitable for use as living space is to get the basement finishing project properly permitted.

Although homeowners often use the terms basement remodeling and basement finishing interchangeably, they are quite different terms. 

Finishing a basement is the process of taking a basement space that is not habitable and adding elements to make it usable. This includes adding plumbing, flooring, and insulation.

Remodeling a basement means taking an already existing finished basement and changing it, often by adding or removing walls, adding plumbing, or changing the existing flooring.

Egress windows or doors are required in finished basements to meet safety and building codes. If your basement is unfinished and used as a storage space, egress windows are not required, but anything considered a habitable space must have an additional point of egress in addition to the stairs.

The difficulty of adding a basement to an existing house can vary depending on the house’s location, the size of the basement, and the type and condition of the existing foundation. Adding a basement is a job best handled by the pros, so you’ll need to enlist professional help for this project.

The Nelson, NH homeowners’ guide to basement remodels

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