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Southeastern Development Co. builds systems-built custom homes; its website states the goal is to "design and build you a systems built custom home that satisfies your living requirements and budget." The company says it has been in business 23 years, and its website lists a service area running from Dartmouth, Marion and Mattapoisett to Plymouth, Falmouth and Hanover. A 2016 customer wrote that they chose SDC for modular home construction after pricing "stick built" and "wall system" contractors. In that 2016 review, the customer wrote that Dana helped design the home, plan the grading for a site with a large hill, work on the budget, handle the permitting and inspections, coordinate with Westchester Modular Homes and act as project manager. The same 2016 customer wrote that Dana designed and built a porch and a two-room addition on-site after the modular boxes were set, and that, with the customer out of the country during much of the project, Dana ran drawing reviews over conferencing software and installed a webcam so construction could be followed remotely. A 2016 customer wrote that Dana built their house on budget and on time and made suggestions when asked. In a 2017 review, a customer called Dana helpful, thorough and responsive and said he did everything he said he would do. A 2022 post on modularhome.org named a Westchester Modular Homes and Southeastern Development Co. LLC project in Mattapoisett as that month's winning home. The company's Better Business Bureau grade is A+.
βThis monthβs winning home comes from a Westchester Modular Homes and Southeastern Development Co. LLC project in Mattapoisett, Massachusetts.β
Dana was extremely helpful, thorough, and responsive. He did everything he said he would do and was able to answer any questions we had.
Superior workmanship and always on time. Best of the best!
Dana was great to work with. And his sub-contractors were great as well. He built our house on budget and on time. Two big factors for me. Made suggestions when asked and most of the time we used his suggestions. Very knowledgeable. I can go on and on. Great company.
My wife and I selected Dana Nilson and his company SDC for modular home construction after interviewing and pricing "stick built" contractors and "wall system" contractors. For us, modular made the most sense because the project could be completed in half the time of a stick built house, was more cost effective than either a stick built or wall system, and will result in a higher HERS (Energy Efficiency) rating than either of the other approaches. Dana helped us design our home, plan the grading as the site has a large hill, work with us on the budget, handle the permitting and inspections, coordinate with Westchester Modular Homes, and act as Project Manager. He has a great sense of what works, especially for a home near the ocean, and a practical approach to solving the challenges that inevitably arise with new home construction on an unimproved lot. Dana also designed and constructed a porch and a two room addition on-site after the modular "boxes" were delivered and set. If I you chose the modular approach, we strongly recommend visiting actual modular houses to understand the true inside dimensions of each "box". It's hard to get a sense of the space from drawings alone. One other item to think about is including insulation between the first and second floors for noise reduction in addition to the insulation "envelope" around the house. Spend time getting the design and drawings right. Dana provided 3D images/renderings to help visualize the finished product. Once the design is accepted by the modular builder changes are very expensive or impossible. While we have all heard horror stories about contractors, our experience with Dana has been excellent. He does what he promises within the time frame he promises. He communicates often and well. During much of this project, I was out of the country and Dana arranged Project Reviews and drawing reviews using conferencing software over the Internet. He also installed a webcam so I could follow the construction progress remotely. In summary, a great experience with an experienced, knowledgeable, honest, and professional contractor. Highly recommended!
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1 change recorded β last scanned Oct 10, 2026.
Typical Greater Boston range for this kind of work, from regional averages β not a quote from Southeastern Development Co., LLC. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$23,000 β $35,000
Typical remodeling project around $29,000
Decks and porches5.0
Clients returning for 10 and 20 years5.0
Detailed craftsmanship5.0
Renovates century-old structures5.0