As the leading exterior contractor on the New Hampshire Seacoast, Allan Trant’s Exterior Finish Work specializes in crafting unique, high-quality outdoor spaces and executing major home expansions. We are experts in custom and composite decks (including Trex, Timbertech, and Azek), railings, porches, and full outdoor kitchens. Whether you’re upgrading an aging deck or planning a high-ticket project like an ADU or Basement Finish, we guarantee a superior build and handle all necessary permits for a completely worry-free experience.
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Allan Trant’s Exterior Finish Work
Allan Trant’s Exterior Finish Work is founded on integrity and built with pride. With decades of hands-on experience, we provide high-quality custom composite decks, railings, and porches for homeowners seeking beauty and low-maintenance function. We are the NH Seacoast’s trusted experts in outdoor living and major expansions like ADUs and Basement Finishing. Every project reflects craftsmanship built to last, allowing our team to bring your vision to life.
Our Services
We specialize in creating spaces that help you get more out of your home. Whether you’re looking to expand your indoor living area or create a beautiful outdoor retreat, our design-build team is here to bring your vision to life. We work with you from the initial concept to the final nail, ensuring a smooth process and a result you’ll love.
We create a variety of Outdoor Living Structures to elevate your property. Explore our full range of services:
We build pergolas, gazebos, and pavilions to create beautiful, functional outdoor environments. Each structure is designed to relax, entertain, and enhance your backyard’s appeal and value.
Our team handles siding, trim, and exterior upgrades that boost curb appeal, increase energy efficiency, and protect your home from the elements, with results that last for years.
We design and construct decks tailored to your needs, blending seamlessly with your home. Our focus is on craftsmanship, durability, and a personalized space for gatherings or relaxing.
Experience low-maintenance, long-lasting decks made from premium composite materials. These decks resist weathering and offer reliable performance without sacrificing style or comfort.
Upgrade your aging deck with a resurfacing or remodeling project. We reinforce existing structures, replace worn boards, and give your deck a fresh new look at a fraction of the cost.
Add built-in benches, lighting, railings, or privacy screens to enhance your deck’s comfort and functionality. We customize each detail for added enjoyment and convenience.
We offer decks made with Trex for superior durability, low maintenance, and a range of attractive finishes. Trex decks stand up to harsh weather and heavy use.
Our TimberTech and AZEK decks are stunning, weather-resistant, and easy to maintain. Choose from wood-look or modern finishes for a custom, high-end appearance.
Enjoy shade, shelter, and style with a custom gazebo or pavilion. Perfect for garden parties, outdoor dining, or relaxing in your backyard retreat.
Maximize your space with underdeck solutions that keep areas beneath your deck dry and usable. Ideal for extra storage or sheltered hangout spots.
We craft decks using high-end, exotic woods for a striking, luxurious finish. These decks feature natural beauty, impressive durability, and timeless style.
We design and build multi-tiered decks to maximize your outdoor footprint. Perfect for dining, lounging, and defining unique outdoor zones in your yard.
Add a fully equipped outdoor kitchen to your deck or patio. We build spaces for grilling, dining, and entertaining with ease.
We install Barrette decking and other advanced products, blending aesthetics, performance, and versatility for vibrant, long-lasting decks.
Our custom pergolas provide shade, comfort, and a stylish focal point for your outdoor space, crafted from quality wood or low-maintenance aluminum.
We design and build custom porches that enhance your home’s entrance and offer an inviting spot to relax, greet visitors, or enjoy the outdoors.
Extend your home’s comfort with rooms for year-round or seasonal enjoyment. We provide added living space with natural light and protection from the weather.
We create custom decks for pools and swim spas, blending safety, style, and durability so you can enjoy your backyard in every season.
We specialize in transforming the unused area above your garage into a custom finished bonus room, perfect for a home office, guest suite, or additional bedroom tailored to your family's needs.
We are a specialized ADU builder focused on delivering premium, functional spaces such as backyard cottages, guest suites, and professional studios. Your new ADU will be a seamless, high-value extension of your lifestyle
We specialize in transforming underused basements into bright, welcoming areas that fit your family’s needs. Whether you dream of a new entertainment hub or a quiet retreat, our team brings expert craftsmanship and thoughtful design to every project.
We are a specialized home additions builder focused on enhancing your property through thoughtful planning and superior craftsmanship. From structural expansions to dedicated workspaces, our team is here to guide you through every step of the process.
We are a specialized Sol-Pergola installer focused on enhancing your property through expert design and 3rd-generation craftsmanship. From premium shade structures to luxury outdoor retreats, our Trex Pro Platinum team is here to guide you through every step of the process.
NOW IS THE PERFECT TIME TO BRING YOUR VISION TO LIFE. LOCK IN YOUR SPOT ON OUR ACTIVE LATE-SUMMER AND FALL CALENDAR, OR SECURE YOUR WINTER HOME ADDITION SCHEDULE TODAY.
The warm weather is in full swing, and for many homeowners, creating a high-end outdoor space or expanding their home is top of mind. At Allan Trant’s Exterior Finish Work, we are in peak production season . Whether you are envisioning a custom composite deck, a screened-in porch, or planning a major home addition, the best time to lock in your build schedule is right now.
We are currently moving projects efficiently through local permit approvals and design to maximize the 2026 building season . By securing your spot on our active calendar today, you can avoid late-season delays and ensure your property is ready for peak hosting months . From luxury composite decks to winter interior conversions, including Additional Dwelling Units (ADUs), Finish Rooms Over Garages (FROGs), and custom basement finishing, take action now to reserve one of our remaining production slots
At Allan Trant’s Exterior Finish Work, we deliver more than just exceptional decks and porches. Our fast, high-quality craftsmanship means your outdoor space is completed on time without sacrificing attention to detail.
our Projects
Testimonials
our Process
We’ve perfected a straightforward, transparent approach to guarantee a superior building experience for your custom deck or outdoor living project across the NH Seacoast.
1
Discuss your vision for your custom deck or outdoor living space and explore all design and material possibilities (Composite, Railings, etc.).
2
Create a custom design tailored to your outdoor living space. We work with materials like Trex, Timbertech, or Azek.
3
Receive a clear, detailed estimate. We handle the critical step of securing all necessary building permits before scheduling construction.
4
Our experts deliver meticulous construction with attention to detail. We ensure superior quality, especially in the deck framing, which is built to last.
5
We conduct a thorough final inspection with you, confirm satisfaction, and hand over your keys to your beautiful new outdoor space.
Yes. We manage the entire building permit process for all custom decks, porches, and home additions across the NH Seacoast. From initial application to final inspection, we ensure your project is fully code-compliant and meets all local zoning requirements in towns like Portsmouth, Dover, and Exeter, providing you a completely worry-free build.
Premium materials like TimberTech and AZEK PVC decking offer superior durability and are virtually maintenance-free. Unlike wood, these synthetic materials resist mold, rot, and insects, and they never require the constant cycle of staining or painting. Choosing high-performance composite saves you significant time and money over the lifespan of your deck while providing a much higher resale value for your NH home.
Beyond expert deck construction, we are trusted specialists in major home expansions and living space transformations. Our high-value construction services include ADUs (Additional Dwelling Units), year-round Basement Remodeling, and Finished Rooms Over Garage (FROG). Each project is designed to seamlessly integrate with your existing home’s architecture while maximizing your property’s functional square footage.
Our commitment to superior craftsmanship starts with meticulous framing, building a foundation that is just as high-quality as the finish. We use advanced structural techniques and moisture-resistant Versatex trim to ensure your project is built specifically to withstand the harsh New Hampshire climate. With three generations of experience, we focus on structural integrity and longevity that goes far beyond standard building codes.
We proudly serve homeowners throughout the NH Seacoast region and surrounding communities. Our primary service areas include Nottingham, Dover, Portsmouth, Exeter, Hampton, Rye, and Rochester. Whether you are looking for a deck replacement in Portsmouth or a new porch in Dover, our local team is ready to provide expert service right in your neighborhood.
Trustindex verifies that the original source of the review is Google. 
Trustindex verifies that the original source of the review is Google. 
Trustindex verifies that the original source of the review is Google. 
Trustindex verifies that the original source of the review is Google. 
Trustindex verifies that the original source of the review is Google. 
Trustindex verifies that the original source of the review is Google. 
Trustindex verifies that the original source of the review is Google. 
Trustindex verifies that the original source of the review is Google. 
Trustindex verifies that the original source of the review is Google. Allan Trant’s Exterior Finish Work is a trusted deck and porch building company specializing in high-quality craftsmanship and efficient project completion. Serving the Seacoast of New Hampshire, the company is known for delivering customized outdoor living solutions with integrity and expertise.
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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
