Expert ADU builder offering detached ADUs, garage conversions & backyard cottages. Structured process: feasibility, permits, construction & final walkthrough. Boost property value, enable multigenerational living & create flexible spaces.
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Licensed ADU contractor and construction management firm for NYC homeowners. We handle eligibility, permitting, and the full build across Queens, Brooklyn, Staten Island, and the Bronx.
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Liamar is a New Jersey contractor building custom garages, ADUs, and accessory structures in Monmouth, Mercer, Ocean, and Burlington counties. Services include permits, foundations, electrical, plumbing, and HVAC — fully code-compliant.
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SLK Buildings offers end-to-end ADU financing support in NYC, helping homeowners access HPD grants, HELOCs, construction loans, and cash-out refinancing to fund garage conversions, basement ADUs, and backyard additions.
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Quality Renovations provides expert Kitchen and Bathroom Remodeling, home additions, and full renovation services with dependable craftsmanship.
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Cascella and Sons Construction Corp builds home additions and ADUs on Long Island. As a design-build firm, they manage design and construction under one roof, offering garage conversions, in-law suites, and detached ADUs tailored to Cape, Ranch, and Colonial-style homes.
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Kondor NYC offers ADU design & installation, including attached, detached units & garage conversions. Ideal for in-law suites, rental income or guest houses. Serving NYC homeowners with expert remodeling solutions on time & within budget.
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Tiny Nooks is a professional ADU builder in Westport, CT, serving Fairfield County. They offer custom ADUs, garage conversions, home offices & pool houses with full project management, quality craftsmanship & on-time delivery.
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At SpecLand, we bring expertise and innovation to home renovations, with a focus on maximizing both functionality and value in New York’s unique urban landscape. Whether you’re looking to expand your home, create rental opportunities, or update your living space, our team is dedicated to delivering high-quality, customized solutions that meet your specific needs.
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Huts offers full-service ADU design and build, handling zoning, permits, and construction. Their flexible designs suit in-law suites, rentals, or guest stays. Transparent pricing, cost control, and financing guidance help property owners maximize value.
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Home Quality Remodeling offers full-service ADU construction in New Jersey, including detached ADUs, garage conversions, in-law suites, and granny flats. They handle design, permitting, and building to boost property value and add flexible living space.
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Expert Designers is an NYC-based ADU architect firm helping homeowners convert garages, basements, and backyards into legal accessory dwelling units. Services include design, permit filing, and construction support under NYC's City of Yes zoning updates.
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Alec's Construction builds ADUs on Long Island, including garage conversions, basement units & detached cottages. Serving Suffolk County, they handle permits, design & construction. Costs range from $50K–$300K+.
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PCS Structures builds high-performance ADUs, backyard cottages & granny flats using SIPs technology. Their SHEDI line offers 15x more airtight construction, better energy efficiency, moisture control & faster build times than traditional methods.
read moreNew York City presents a uniquely challenging landscape for ADU contractors. With some of the most stringent zoning laws, landmark preservation requirements, and building codes in the entire United States, constructing an Accessory Dwelling Unit (ADU) in New York, NY demands specialized expertise. The city's dense urban fabric, aging housing stock, and mix of co-ops, condos, and multi-family brownstones create a one-of-a-kind environment that only experienced ADU builders in New York City can successfully navigate.
New York City's zoning resolution governs where and how ADUs can be built. The city has been gradually expanding ADU-friendly policies, particularly through programs like the NYC Basement Apartment Conversion Pilot Program, which allows homeowners in specific boroughs — including Brooklyn, Queens, and Staten Island — to legally convert basement and cellar units into safe, habitable ADUs. Key regulatory considerations include:
Hiring the right ADU contractor in New York City is critical to a successful project. The best contractors will have direct experience working with the NYC Department of Buildings (DOB), pulling permits, filing plans with a licensed architect or engineer, and passing all required inspections. Look for contractors who are:
Building an ADU in New York City is a significant investment, with costs typically ranging from $150,000 to $400,000 or more depending on the scope, location, and type of unit. However, given NYC's extremely high rental demand and property values, a well-constructed ADU can generate substantial rental income and significantly increase property value. New York City ADU contractors who understand both the technical and financial dimensions of these projects are invaluable partners for homeowners looking to maximize their real estate investment.