Design Build Contractors

Mammoth is a design-build company.
Designed and built for renovating, in New York City.

We’re a woman-owned and run design-build firm, specializing in renovations. We met in Architecture School nearly two decades ago, and gained valuable experience in the fast-paced New York City design and construction scenes. We leveraged this experience to develop a more thoughtful and efficient process tailored for the urban renovation market. We utilize technology for planning, budgeting, design, and communication to achieve clarity and precision at each step of the way.

Our studio is located in Dumbo, Brooklyn, and we work on projects mostly in Manhattan and Brooklyn.

You can read more about what we do for homes here.
And what we do for commercial spaces & offices here.
And see some of our recent work here.

Founding Team

Maryana Grinshpun

Founded by Maryana Grinshpun, a New York City-based architectural and interior designer, in 2013, Mammoth expanded into construction in 2022. Prior to starting her own company, Maryana worked at various architecture firms, including WXY Architecture, System Architects, Janson Scuro, Tihany, and Design Bureaux. She has worked on numerous notable projects, such as The Africa Center (NYC), two ground-up Saks Fifth Avenue Flagships, The Hudson Yards, Oberoi Hotels, as well as many restaurants and retail locations. Her work has been featured at several prestigious institutions, including the Museum of Modern Art (MoMA, NYC), The Africa Center (NYC), The New Museum (NYC), the Whitney Museum for American Art (NYC), and The Storefront for Art and Architecture (NYC).

Maryana holds a Master's degree in Architecture from the City University of New York, as well as a Bachelor's degree in Economics and English. She has also studied at the Parsons School of Design and The University of Copenhagen. Maryana has taught at the New York School for Interior Design and been a guest critic at the Spitzer School of Architecture at CUNY, College of Architecture and Design-NJIT, and the Pratt School of Architecture. She is a member of the American Institute of Architects, Chief, and The Young Entrepreneurs Council at Forbes. Maryana has been featured in local and national media, including Forbes, Lonny, Brick Underground, Liabal, Homes & Gardens, among others.

Jessica Maktal

Jessica Maktal, co-founder of Mammoth Built, has been solving problems and executing projects for private clients and global and local brands for over 20 years, including 3M, Procter and Gamble, Maman, Robert Marc, and Waterworks.

Jess has led the renovations of more than 50 residential and commercial interior spaces in NYC, with budgets ranging from $20K to $2 million. Having worked extensively in the city as a designer, builder, and high-end general contractor, Jess has gained a reputation for inspiring the very best in her crew with her diligence, creativity, and calm-under-pressure approach.

Jess holds a Masters Degree in Architecture from the City University of New York and a B.A. from Barnard College, where she double-majored in Dance and Architecture. She has previously taught at the Spitzer School of Architecture at CUNY College of Architecture.

  • "(They) brought professionalism and creativity to my project, and understood and respected the importance of my budget and timelines"

    Sheena Chandran,
    Reviewed on Houzz.

  • "Was an absolute breeze to work with, and so so talented."

    Cole Dennis,
    Reviewed on Houzz

  • "Incredibly hands on, and made sure every inch of the project was done perfectly."

    Andrew Young,
    Reviewed on Houzz

  • "Transformed our drab outdated office space in Manhattan into a modern collaborative space."

    Deborah Kolben, 70 Faces Media.
    Reviewed on Google