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4B Construction is the kind of builder homeowners call for a project that changes how a house works: a high-efficiency new home, a carefully planned addition, or a renovation that joins several trades. The company says it is based at 395 Mile Slip Road in Milford, serves Milford, and was established in 2017 before returning to Southern New Hampshire in 2019. Stephen Badger founded and leads the business, with Tara Badger managing operations and family members involved. The customer stories are unusually specific. In an August 2025 Google review, a homeowner described replacing a failing deck and screen porch with Trex decking, a propane line, and a three-season porch, praising both the finished quality and the range of options discussed during the project. Earlier reviews describe a high-efficiency home designed around Passivhaus-level goals, an ADU, a kitchen and bath renovation with a 20-by-16-foot addition, and a garage with an apartment above. Reviewers repeatedly mention communication, flexibility, careful execution, and transparent estimating. The company’s website centers sustainable, high-performance home building, renovations, and additions. It describes custom homes, design-build work, and architect partnerships, while the BuildZoom profile lists 24 projects and says a contractor license is not required in New Hampshire. Confirm the exact scope, energy-performance targets, and which specialty trades will be handled in-house or by subcontractors before signing. 4B looks suited to homeowners planning a substantial custom build or multi-room renovation who want close involvement from the builder. Ask for a written scope and schedule, and confirm the current project pipeline and the details behind any efficiency targets.
It was time for a major change to our old screen porch and falling apart wooden deck. Stephen and team did an absolutely fantastic job ripping out the old, and installing the amazing new. New Trex material for the outdoor deck, new propane line run, and a new 3-season porch that we've fallen in love with, with 4-track windows. We couldn't be happier with the final looks & quality of the install. Stephen also did great job of communicating and helping evolve the shape of the bill - helping provide a range of options so we could choose the things that mattered most for spending a bit more vs. making smart budget conscious choices. Thank you to all the folks who worked on our project - you're all amazing!
Stephen and his crew have done exemplary work in bringing our dream home into reality! We wanted a high efficiency house (equivalent or better than Passivhaus standards) and he did not disappoint. Working with us to understand what we wanted and bringing recommendations for further improvements we had not thought of, his insights and skills brought our plans to be even more than we'd expected. Highly recommend!
My Mom was widowed suddenly and her best option was to build an ADU (Accessory Dwelling Unit) on our property in New Hampshire. We chose Stephen and 4B Construction because we felt heard with our requests and knew quality wouldn't be compromised. It was apparent from the beginning that Stephen was passionate about the home's efficiency and not cutting corners. Stephen was extremely flexible and patient as we explored different layouts and modifications to the design. The focus and timeline of the build was incredible. There are countless things to account for when building a home and Stephen was able to manage all of it seamlessly. 4B Construction brings a good energy to the job site. The subcontractors respect the team and match 4B's quality of work. My Mom was in California during the construction so I was the main point person and felt very comfortable asking questions and bringing up any concerns she had throughout the build. The guys were friendly with our dog and my boys which is important since 4B was here most days in the summer. They even totally embraced a surprise water balloon attack one summer afternoon! We highly recommend Stephen and 4B Construction for their quality work and finished product. We know that Mom's ADU is a solid build and will see many happy years.
4B construction completed a 20' x 16' addition, renovated our kitchen, bath and added an entry way to our home. Throughout the entire process Stephen was professional, delivered on his commitments, timely and responsive. When problems did arise (and they will in home renovation), Stephen was engaged, accountable and worked to find cost effective solutions. His estimating and invoicing process was transparent and clear. Additionally, Stephen was flexible and willing to support additional scope of work to include an exterior door and small deck replacement. My wife and I will use Stephen and team again in our next renovation project.
4B Construction did a large addition to our home which included a 2-car garage with an apartment above. We could not be happier with the work they did and the way they did it. Stephen was helpful in the design and careful in the execution. He communicated throughout and was always on site when he said he would be (no small detail when compared to many contractors). He and Connor were an absolute pleasure to work with...my wife and I give them our highest recommendation. In fact, as long as he is available, we don't anticipate calling anyone else in the future.
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1 change recorded — last scanned Sep 8, 2026.