Hierarchy Architecture + Design, PLLC

Hierarchy Architecture + Design, PLLC is an interior design and architecture firm in Manhasset, NY. The company specializes in creating timeless designs integrated into existing home and neighborhood contexts, with a focus on Clean Modern, Transitional, and Traditional styles. Services range from ground-up new home construction to detailed interior and gut renovations, kitchen and bathroom remodels, and custom millwork. A distinguished specialty is the restoration of old Tudor and Colonial homes in the Greater New York area. The firm supports clients through planning, design, bidding, permitting, and construction site visits. It holds a rating of 4.90 based on customer reviews.

TJ Costello, the founder and Principal Architect, brings over 35 years of experience to the practice. A graduate of Cornell University and NYU, he has been a registered architect in New York and New Jersey since the 1980s. He is the only architect on Long Island who is both a member of the American Institute of Architects and a Certified Kitchen Designer. Costello also serves as an Adjunct Professor at NYIT School of Architecture in Old Westbury. The firm has worked on projects such as transforming a former elementary school in New Cassel into affordable senior apartments for the North Hempstead Housing Authority. The studio operates Monday through Friday from 9am to 5pm, with evenings and weekends available by appointment.

The office is located at 7 Gaynor Avenue, situated about a block from Plandome Road. It is approximately a tenth of a mile from the MLFD Company #1 Firehouse, the Plandome Heights Village Hall, and the Manhasset Post Office. Heroes' Plaza is also located about a tenth of a mile away.

The firm is known for its collaborative approach to complex residential and commercial projects, ensuring personalized attention throughout the design process. Its positive rating reflects the satisfaction of clients who have engaged with the practice.

Hierarchy Architecture + Design, PLLC combines architectural rigor with detailed kitchen and bath expertise to serve the north shore of Long Island.