From spa to studio: MOSS turns a 1922 Church Street landmark into its new home. A remodeler remodels its own home. For 25 years, MOSS Building & Design has been rebuilding other people's houses across Northern Virginia. This fall, the company finishes the job on its own. MOSS is moving its headquarters out of a larger office suite in Chantilly's Lafayette Business Center and into a two-story building at 108 Church Street NE, in the heart of Vienna's historic Church Street corridor. The building dates to 1922 and, for most of the past two decades, was home to Diamond Spa, which opened there in 2007 and closed quietly earlier this year. MOSS bought the property for $1.68 million in February and is converting it into what it calls the Vienna Architectural Design Center. The exterior work went through the Town's Board of Architectural Review, with James Hardie siding, Pella windows and doors, new roof shingles and gooseneck lighting. The finished look is crisp white siding, black trim and a black awning. CEO Paul DesRoches II says the company wanted a studio that feels "more intimate, inspiring and reflective" of the client experience, putting clients, designers and the design process under one roof. The move brings roughly 50 employees into town, and Mayor Linda Colbert has welcomed it as a major investment in Church Street. Ribbon-cutting: Thursday, Oct. 22, 5 to 6 p.m., 108 Church Street NE. Who MOSS is. MOSS was founded in July 2001 by Jason Hampel, a former ExxonMobil employee, and his father, Pete Hampel, who had learned the trade remodeling his own home. The name honors Jason's grandfather, Paul "Moss" Hampel, whose advice to think about what he was working so hard for helped push Jason into business for himself. Today the company serves Northern Virginia, Washington, D.C. and Montgomery County, Md. It reports more than 7,200 homes remodeled and a 4.7-star rating across more than 1,100 Google reviews, and says it completes about 100 high-end projects a year. Qualified Remodeler ranks MOSS No. 121 on its list of the top 500 remodelers in the country, and the firm won a bronze 2026 Master Design Award for a home addition in Great Falls. Services. MOSS is a design-build firm with in-house architects, designers, project managers and craftsmen. Its core lines of work: * Additions: in-law suites, primary suites, kitchen bump-outs and full second stories * Kitchens: full redesigns and open-concept conversions * Bedrooms and bathrooms: primary suites and spa-style baths * Basements: finished living space, guest suites and home theaters * Living spaces: mudrooms and interior reconfigurations * Exteriors: James Hardie siding, porches, decks and roofing * Historic home renovations: older and historic properties, including D.C. rowhouses The client experience is heavily tech-forward. Homeowners start with a virtual discovery session and can first quiz "Natalie," an AI research assistant on the MOSS website, about likely costs, timelines and process. During design, the MOSS 360 platform lets clients preview their project virtually before construction. Once work begins, MOSS Online serves as a client dashboard for selections, progress photos, budgets and schedules. Each client gets a dedicated consultant, designer, and project manager. The company also reports ISO 9001:2015 quality-management certification and EPA Lead-Safe firm certification. The bottom line. MOSS brings real scale, 25 years of local history and a polished design process to Church Street, and the restored 1922 building should be an attractive addition to Vienna's main corridor. Its design work wins awards, and its tools for keeping clients informed are ahead of most competitors. The open question is follow-through on large, long-running projects. Homeowners considering MOSS for an addition or whole-house remodel should ask for references from comparable recent jobs, get the punch-list and warranty process in writing, and ask who will manage the job day-to-day. MOSS Building & Design, Vienna Architectural Design Center. 108 Church Street NE Vienna, VA 22180 703-961-7707