Penn Construction and Design

This Philadelphia-based design-build firm specializes in detached ADUs and guest houses, offering full-service capabilities from initial design through final construction. The company brings deep expertise in navigating the city's complex zoning codes—particularly RSA-5 and CMX-1 district requirements—and the Philadelphia L&I permit process. Known for high customer satisfaction ratings on Yelp, the firm serves the greater Philadelphia region with projects tailored to local regulatory environments.