How can we help you?

All your architectural needs taken care of.


We offer full-scale new home designs from the ground up. No detail is arbitrary.  We'll create a design that matches your individuality. Not only do we provide you with a beautiful design plan, but we will be a helping hand at every step of the process, through bidding and permitting, and we regularly visit the site during construction to ensure that the final product achieves Hierarchy's high standard of detailing.​


Our interior remodels range from small, single rooms, to large-scale full interior & total gut renovations. Whatever the project, we'll create a design that compliments the existing features while breathing new life into your home. Our team of experts will work with you to bring your vision to life starting with a process we call "The Program" or "Wish List". Then we help prioritize your goals within the constraints of the existing conditions, your budget and time-frame. Check out past Interior Remodels.



Kitchen & bathroom remodels are often the centerpiece of home renovation projects and if you are looking to upgrade these areas of your home you've come to the right place!  T.J. Costello is Long Island's only dual-certified Architect & NKBA Kitchen Designer. T.J. and our team understand that functionality is just as important as design and we'll create a design for you that is beautiful and functions flawlessly with the makeup of your family (including pets!).  Check out some of our past Kitchen Renovations and Bathroom Renovations.



Restoring timeless, classic old homes is a specialty service we've become known for on Long Island. Working mostly with Tudor and Colonial style homes, we create "new-old homes" that maintain the beautiful architectural features of the original home, but restore them to look brand new again. It takes a special design ability to ensure that all the new design features transition seamlessly into the existing home's composition. Check out our past Restoration Projects.​



 We offer specialized custom millwork and metal solutions, creating unique designs for our clients. We tailor specific requests from our clients or recommend unique designs for your home that require custom creations. These designs include, wainscot paneling, ceiling beams, wrought-iron railings, storage cabinets, kitchen storage, mud rooms, laundry rooms, pet cage/pet care storage, closets, crown molding, grout matching restoration masonry and exterior brickwork. Check out some of our Custom Millwork designs.  ​ 



With plenty of beachfront property on Long Island, Hierarchy offers beautiful custom designed beach & vacation homes. These secondary homes provide a relaxing escape and are carefully planned and constructed with your family in mind. We ensure all our beach homes meet all town regulations or requirements. Each unique cottage is built with the highest structural integrity giving you peace of mind that the home is fit to withstand extreme weather conditions.



Creating effective public housing requires a keen ability to balance budgeting and design. Our staff at Hierarchy is well suited tackle this challenge. We design these rent-stabilized developments with the same care and detail of a single family home. The result is a property that's design appeals to all families and creates a sense of community within the residents. The multi-family apartments are ideal for renting to retired seniors and low-income families. Check out one of our recent Multi-Family Housing Projects.



We renovate bars, restaurants, and other commercial,  hospitality or entertainment spaces. With a focus on building a unique atmosphere for your customers, we will create a design that is not only stunning, but maximizes the economic potential of the space as well. One of our most recent commercial projects revived Publicans American Tavern, a storied Manhasset pub immortalized in the best-selling memoir "The Tender Bar" by J.R. Moehringer. Check out the photos here.




Beyond our core architecture services, we have many other specialties not previously listed including Garages, Roofing,  and Landscaping. It's very likely that whatever your goal, we can help you achieve it, so please Contact Us and let's start building your dream home!

  • Facebook
  • Instagram
  • Pinterest
  • Houzz
  • YouTube
  • LinkedIn

Hierarchy Architecture + Design PLLC | Traditional + Contemporary Designs | Long Island Architect

Respectful of the past, excited about the future

Hierarchy Architecture + Design PLLC is a Long Island architecture firm based out of Manhasset, NY, in Nassau County. Hierarchy is one of Long Island's premier architecture and design firms, with a team of  talented architects led by Principal, T.J. Costello. We specialize in providing customers with timeless architecture solutions by creating or remodeling classic homes that are seamlessly integrated into the neighborhood's existing context. Hierarchy Architecture + Design PLLC is known for designing custom residential, primary & vacation homes in modern, contemporary, traditional or transitional styles. Our team of architects has developed an impressive portfolio of projects from large scale new building, ground-up architecture projects, to smaller more detailed requests like custom millwork. The architecture firm has become known on Long Island for its seamless residential gut renovations, and Tudor restorations, creating "new-old homes" by breathing life back into  classically designed houses. The team of architects has also done interior renovations and exterior renovations or additions for many brick colonial homes in the Tri-State area.  Aside from single-family residential projects, Hierarchy has also completed multi-family housing or institutional housing projects, as well as commercial hospitality projects, such as bars and restaurants. T.J. Costello, the Principal architect for Hierarchy Architects + Designers PLLC  is the only Long Island architect who is also Certified Kitchen Designer and most home remodels that are done often include a kitchen renovation, and bath renovation.  Follow the link to learn more about the architecture and design services we offer. For additional information or to book a consultation with us, click here to contact or view our contact information.

Copyright @ 2020 Hierarchy Architecture + Design, PLLC