A boutique firm with a life safety heart.

CAP Design Group is a specialized engineering design firm serving clients across Massachusetts and the greater New England region. We combine deep technical expertise with a collaborative, client-first approach that delivers compliant, constructible designs — on time and on budget.

Our principal-led team brings direct accountability to every project — from initial permit-set drawings through construction administration. Whether you're developing a mid-rise residential building, a historic renovation, or a complex commercial facility, our engineers have the experience to navigate code challenges and AHJ requirements at every stage.