Woman-owned, award-winning design-build company in NYC

We specialize in high-end gut renovations of apartments, co-ops, condos, brownstones, lofts and townhouses across Manhattan and Brooklyn. We handle everything under one roof, from interior design, material selection, DOB filings and board approvals through to construction.

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“A distinctive home, defined by thoughtful design and a strong sense of place”

“One of the New York Builders and Contractors you need to know”

“The best open storage adds personality to a room. Here’s how it’s done”

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A better way to build in NYC

Unlike traditional architecture and design firms, we also act as project managers and are the general contractor. So you have one team accountable from concept to completion, fluent in New York's co-op boards, landmark rules and pre-war buildings. You'll spend less time worrying about the renovation, and end up with a stunning home you'll love that adds value and looks great for years to come.

Walnut kitchen with a marble island and leather bar stools in a Mammoth-renovated NYC home

Oak storage bench with a built-in pull-out dog-bowl drawer and a small dog feeding

Dining area with an exposed red-brick wall, blue-grey cabinetry and a wood table with black cross-back chairs

Sitting room with an olive-green velvet sofa against deep blue-green panelled walls and a vase of allium flowers

Oak kitchen with a marble-topped island and two ribbed globe pendant lights

Bedroom with an upholstered cream bed and a woven pendant light beneath an exposed wood-beam ceiling

Sage-green kitchen with a veined-marble backsplash and island beside a glass-block wall

Living room with a black marble fireplace, a tan shearling armchair and a burl-wood coffee table

Powder room with a perforated-metal vanity, a marble top and a city-view window

View through open walnut sliding doors into a dining room with globe pendant lights

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Meet our founders

Mammoth is led by its two co-founders, Maryana and Jessica, who work personally on every project, supported by a full team of designers, project managers and builders. Maryana leads the design, and Jessica runs the build. Both hold a Master of Architecture.

Maryana's work has been featured at MoMA, the Whitney and the New Museum, and she's worked on the Saks Fifth Avenue flagships. Jessica has spent more than twenty years building for names like Waterworks, Maman and Robert Marc, and has led over fifty renovations across Manhattan and Brooklyn.

From their studio in Dumbo, they design for the way New Yorkers actually live. Their homes are warm and tailored, with custom millwork that makes a New York apartment feel larger than it is, and that lets the character of the building come through.

Jessica Maktal

Maryana Grinshpun

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“After interviewing many designers, I hired Maryana from Mammoth Projects to help renovate my condo in New York. Mammoth was amazing to work with and managed our project seamlessly. They were incredibly hands on and made sure every inch of the project was done perfectly. I can't recommend Mammoth Projects highly enough.”

Andrew Young

West Village Condo Renovation

Our process

1. Discovery

It starts with a call with one of our founders, where we get to know your project, your space, and what matters most to you. From there, they walk your home with you in person, joined by one of our designers. Together, we put your budget behind what you'll value most, so the home is everything you want it to be, with nothing wasted. You'll come away with a clear proposal: the scope, the pricing and the timeline.

Deep blue-green panelled sitting room with a checkered-upholstered armchair beside the window

2. Design & Permitting

We start from your taste, how you live, and what you're drawn to. Then Maryana, our co-founder and design lead, works with our design team to bring your vision to life and take it further than you could alone, down to every detail: the layout, the finishes, the custom millwork. Once you've approved the design, we handle the co-op and condo boards, the alteration agreements, the DOB and Landmarks filings. We've worked with these boards for years and know precisely what each one requires, so we get them approved and keep it all off your plate.

Bedroom with a full wall of walnut wardrobes and an open door to an ensuite bathroom

Kitchen with a black soapstone waterfall island and backsplash beneath a row of globe pendant lights

Bathroom with a glass walk-in shower and an oak vanity with a carved grey marble sink

3. Build & Move-In

Then Jessica, our co-founder and construction lead, runs the build with our own in-house crew and the specialty trades we've worked with for years. Someone from our team is on site full-time, making sure it's built exactly the way it was designed. You get frequent updates, and you walk the project with us at each key stage. At the end, our founders walk the whole home together to make sure every detail is right. Then it's cleaned and finished, and handed over ready for you to move into and enjoy for years to come.

Living room with a black marble fireplace, a tan shearling armchair and a burnt-orange velvet chair

Study with an olive-green velvet sofa against deep blue-green panelled walls

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Reviews

Brooklyn Commercial Loft Renovation

“I feel very fortunate to have chosen Mammoth Projects to design my kitchen project. I came into our meeting with some very basic ideas of what I wanted, and some specific design elements that I needed. Maryana had the talent to meld the two into one cohesive design, that worked beautifully in the space. She has a very elevated aesthetic that added layers of beauty and sensibility to the project.

She is impressive in the way that she handles every detail of the process, from getting bids, to leveling bids, to making sure that the contractor's work meets her standards. She was a pleasure to work with and I hope to work with her again in the future.”

Mark Platt

Industrial loft with a blue kitchen island and skyline views — Brooklyn commercial loft renovation

Blue cabinetry wall on a polished-concrete floor

Blue kitchen with a concrete wall, double wall ovens and a live-edge counter

West Village Condo Renovation

“After interviewing many designers, I hired Maryana from Mammoth Projects to help renovate my condo in New York. Mammoth was amazing to work with and managed our project seamlessly. They were able to work well within the budget and create stunning designs within my home. The highlights of the project outcome include a floating fireplace in the living room and a stunning slate bathroom. Additionally, they were incredibly hands on with the contractors and made sure every inch of the project was done perfectly. I can't recommend Mammoth Projects highly enough. Believe me, you won't be disappointed!”

Andrew Young

Bedroom corner with sliding glass doors opening to a terrace — West Village condo renovation

Room with a green-tiled fireplace and a white chaise lounge

Living room with a grey sectional, a blue rug and an exposed-brick TV wall

Brooklyn Condo Renovation

"Maryana Grinshpun had exceptionally valuable design suggestions for me. Her ideas made all the difference in the remodel of my one-bedroom condominium unit in a Brownstone building in Brooklyn. I love it! She had endless contacts for getting the work done. She listened to me, helped me figure things out time and again, and was extremely responsive."

Melody McCutcheon

Black soapstone counter with an integrated sink — Brooklyn condo renovation

Oak cabinetry with dovetailed drawer joinery

Grey stone-tiled shower niche beside a white bathtub

Brooklyn Heights Renovation

"Mammoth Projects helped us to complete a remodel and interior decoration project. They were particularly good at helping us to translate what was a somewhat vague concept of what we wanted into a concrete plan, walking us through many options and iterating the design based on our reactions. She pushed us to consider options we would not have entertained, but which turned out to be perfect in the space. We were incredibly happy with the final result & would highly recommend Mammoth Projects."

Deitra Mara

White bathroom with a walnut floating vanity and green patterned floor tile — Brooklyn Heights renovation

Playroom with a slate-blue sofa, a surfboard on the wall and a jute pouf

Brooklyn Townhouse Renovation

Allie Meyer

Children's room with floral wallpaper, a teepee and a striped rug

Library den with floor-to-ceiling bookshelves, a record collection and a black sofa

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"Maryana was fabulous to work with. Very creative and practical for our family living. We had no issues going back and forth and looking for different options. She also was a godsend coordinating with the architect and contractor to get everything done. I would definitely hire her again."

Keech Comb

Basement lounge with an olive-green quilted sofa beneath a reclaimed-wood ceiling

Tiled steam shower with a teak bench and a glass door

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Frequently asked questions

What’s the difference between a design-build firm and a general contractor?

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What types of projects do you typically handle?

Do you handle renovation permits and building approvals?

How do you price a project and can you work to our budget?

We've never renovated before and aren't sure what we want. Can you guide us?

How long does a full renovation take?

Who does the construction, your own crew or subcontractors?

Submit inquiry

Due to the hands-on nature of our work, and the combined 40+ years of design-build expertise we pour into each home, our minimum project size is $250K. We work in Manhattan and Brooklyn only. Please add the address of the home you're looking to renovate, so we can prepare before we speak.

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