PNB Interior Design, Inc. We are a full service interior and building design firm with over 30 years of experience and resources to serve all your design needs. From assessing your situation to creating design options to completing your project, PNB give you the advantage for success on your next project. . Interior Design Building Design Real Estate Staging; PNB Signature Staging Furnishings Remodel, Renovate, Re-Design Additions Kitchens and Baths Home Theaters and Specialty Spaces New Construction Planning and Design Visit our Furniture and Showcase Studio! We have opened a spectacular showroom at our new location. This will allow our clients to browse a wonderful selection of furniture and case goods by appointment. 10 Church St. Second Floor Northborough, MA