Portsmouth, NH, Basement Finishing

Upgrading your underutilized lower level is a fantastic way to maximize your property’s potential. We specialize in top-tier basement finishing in Portsmouth, NH, turning empty concrete rooms into vibrant, comfortable environments for everyday use.

Our experienced team blends functional design with exceptional build quality to give you a stylish new area to enjoy. You get an effortless process, clear communication, and a beautiful result tailored directly to your lifestyle.

Reach Out Today!

Requesting a free estimate is quick, easy, and comes with no obligation to commit. Our team provides honest, transparent pricing so you can explore your options without pressure.

NOTE: We don’t offer repair or staining services

Expert Craftsmanship

Fast Turnarounds

Personalized Solutions

Elevate Your Home with Custom Upgrades

Creating a functional lower level adds immense value and comfort to your property. We handle your entire home renovation project from the initial layout sketches to the final coat of paint. Securing our services is remarkably simple. Just contact us for an estimate, and we’ll outline a clear plan to build the perfect entertainment hub, guest suite, or customized office for your family.

Maximize Your Usable Footage

Our expert craftsmanship ensures your new layout perfectly supports your daily habits. We create stunning finished living spaces that blend seamlessly with your main floors. You gain beautiful, highly durable rooms built precisely to your specifications and designed to last.

Enjoy Efficient Installations

Working with dedicated basement finishing contractors in Portsmouth, NH, means your project stays right on schedule. We deliver fast turnarounds so you don’t have to wait. You’ll get to start enjoying your brand-new entertainment area or home gym much sooner.

Tailored Designs to Fit Your Budget

We provide personalized solutions that match your specific vision and financial goals. We’ll give you full transparency on the price per sq ft to finish the basement in Portsmouth, NH, ensuring you get high-quality results and a layout that works perfectly for your wallet.

About Us

Allan Trant Exteriors opened its doors in 2014 and rests on a strong legacy of craftsmanship spanning three generations. Our founder grew up surrounded by the construction trades, mastering the core values of precision, hard work, and putting the customer first. Today, our crew creates high-quality finished basements in Portsmouth, NH, and stunning outdoor living areas across the Seacoast. We deliver projects that showcase integrity, careful attention to detail, and lasting value.

We offer more than just basic construction. We prioritize personalized service and honest work for your basement remodeling. By utilizing premium materials, maintaining clear communication, and ensuring on-time project completion, we turn your property dreams into reality. Rooted in community commitment, we build exceptional areas your family will cherish for decades. We are excited to partner with local contractors and build lasting professional relationships.

Testimonials

      EXCELLENT  
   Based on 21 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Christine Graham 
 
 
 
 Trustindex verifies that the original source of the review is Google. Allan and Samantha Trant are exceptional! They take quality seriously and are always professional. I love my new deck and highly recommend them if you are looking for high quality, professional, responsive, and clear communication regarding your project.
  
 
      Posted on Google  
   
   P W 
 
 
 
 Trustindex verifies that the original source of the review is Google. I can't say enough about these folks.  I had 7 quotes and selected Trant's out of all of them as my neighbor had extensive work done by them and the finished quality was outstanding. They weren't the lowest or the highest. Right in the middle, but they were the ones I felt the most comfortable with. There were 3 in the crew and the same crew worked on the project from start to finish. They were all respectful, friendly, VERY easy to deal with, and in many cases went "above and beyond". The design and quality of their work and their attention to detail was absolutely impeccable. There were no "surprises" or incidental costs added on regardless of what issues they ran into during the project. The communication was great and timely. I would hire them back for any project in a New York minute. As a matter of fact, I am having them look at another project for my son as I write.
  
 
      Posted on Google  
   
   Kathleen Sawler 
 
 
 
 Trustindex verifies that the original source of the review is Google. Exceptional service and craftsmanship. Always kept us informed on the process. Reasonably priced and very professional and respectful.
  
 
      Posted on Google  
   
   Pauline Rock 
 
 
 
 Trustindex verifies that the original source of the review is Google. Allan Trant’s Exterior Finish Work built a beautiful new deck at the back of our home in Dover, NH, and we couldn’t be more pleased with the results!

From beginning to end, communication was excellent. Allan’s crew was talented, professional, courteous, and respectful of our property. Their attention to detail and craftsmanship were exceptional, with every measurement and finishing touch completed with great care and precision.

Once the deck was finished, they returned to remove all of the debris, added crushed rock underneath the deck, and even put down topsoil and seed around the surrounding areas to give everything a clean, finished look.

We absolutely love our new deck and have already recommended Allan Trant’s Exterior Finish Work to several friends. We will gladly continue to sing their praises to anyone looking to build or replace a deck. We highly recommend them!
  
 
      Posted on Google  
   
   Yasmina 001 
 
 
 
 Trustindex verifies that the original source of the review is Google. Allan Trant’s Exterior Finish Work did our deck when we built our home in Greenland, NH, and we couldn’t be happier with the results. The attention to details was outstanding, and the entire process was professional from start to finish.
Our deck has become one of our favorite parts of our home.
If you’re looking for an honest contractor who delivers high-quality work, and beautiful results, I highly recommend Allan !
  
 
      Posted on Google  
   
   Kristy Osborne 
 
 
 
 Trustindex verifies that the original source of the review is Google. The craftsmanship on our front entry stairs is top-notch and exactly what we wanted!  Allan and team really take pride in their work and the project went smoothly from start to finish. Very happy with the result.
  
 
      Posted on Google  
   
   Alexandra Roy 
 
 
 
 Trustindex verifies that the original source of the review is Google. Can’t say enough good things about working with Allan & his team. The whole process was easy, transparent and professional. Hired them to do some work that impacted the inside and outside of a second floor window. After we contacted them they made it easy to schedule a time to meet and get a quote, understand costs, answered all my questions. They were very knowledgeable about what they were doing and how they would repair the problem. We trusted them to do the job and they did not disappoint! The team that came to do the job was well mannered and cleaned up after themselves. I can’t say I’ve ever worked with a contractor that was this put together. We recommend them and will also be using them again for future projects.
  
 
      Posted on Google  
   
   Stephen Myong 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had my deck completed last fall, and they did a wonderful job. The work was finished in a very timely manner, and they were flexible in handling additional work at a reasonable price. I would highly recommend Allan Trant’s Exterior Finish Work / AJT Properties.
  
 
      Posted on Google  
   
   Keenan Duffy 
 
 
 
 Trustindex verifies that the original source of the review is Google. I couldn’t be happier with the work and outcome of my new deck build.
Allan was a pleasure to work with and would highly recommend him to anyone.

Areas We Serve

Allan Trant’s Exterior Finish Work is a trusted building company specializing in high-quality craftsmanship and efficient project completion. Serving the Seacoast of New Hampshire, we are known for delivering customized solutions with integrity and expertise. We are your go-to choice for premium basement finishing in Portsmouth, NH, and beyond.