Design Build Boston Construction, LLC

Design Build Boston Construction is the construction half of a Charlestown pair: the company and Design-Build Architects are separate entities for insurance purposes but, by their own account, run as one team — so the architect drawing your addition and the contractor building it answer to the same people. The angle that sets them apart is energy performance. The firm says it is a Certified Passive House Builder and holds PHIUS Certified Builder status, and that it applies passive-house standards as the target even on projects that will never be certified. Deep-energy retrofits sit on the service list beside new builds, additions and renovations. Its Massachusetts home improvement contractor registration, number 202757, is active and held in the company's own name. BuildZoom shows the same number and scores the company 96. Its BBB profile carries an A+ grade, though the business is not BBB accredited, lists one employee, and gives a start date of September 2015. What there isn't, anywhere, is a customer talking about a finished job — no reviews on BBB, BuildZoom or Houzz. The closest thing to a track record is the permit trail: bathroom renovations at two Malden addresses filed in March 2025 at $52,000 and $90,000 (the second was canceled), and a two-story front porch replacement in Somerville issued in May 2022 at $50,000. They're a sensible call for an energy-focused renovation or addition in Boston's older housing stock, where the design and permitting side is half the job. Before signing, get clear on two things: how the two companies contract with you — one agreement or two, and who carries which insurance — and, given the single-employee listing, which trades are subcontracted and who supervises them day to day.