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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ADU Advisory is a NYC-based organization led by former Buildings Commissioner Robert LiMandri, helping property owners plan, permit, fund, and build accessory dwelling units (ADUs) across all five boroughs under City of YES regulations.
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Haven ADUs is a Brooklyn-based design and project management firm specializing in accessory dwelling units (ADUs). They guide property owners through feasibility, design, permitting, and construction, serving as a single point of contact throughout.
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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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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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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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OneBuild is a Hudson Valley ADU firm founded in 2025, managing full-scope projects including feasibility, permitting, design, prefab selection, and installation of backyard cottages, in-law suites, and granny flats.
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BuildLabs is a design-build company specializing in ADU construction across all 50 states. They offer custom and pre-approved plans, sustainable materials, and a streamlined 16-week build process covering planning, permitting, and final inspection.
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Pro Contracting Services offers home additions & room conversions in Buffalo, Amherst, Clarence, Hamburg & beyond. Services include ADUs, in-law suites, sunrooms, second-story additions & room conversions tailored to each property.
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New Hampton Construction builds custom ADUs on Long Island, including in-law suites, guest houses, rental units & home offices. Projects range from $100K–$300K+, take 4–8 months, and may qualify for Plus One ADU Program grants.
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Two Stories Woodworking LLC, Suffolk NY's trusted ADU builder & remodeling contractor. Specializing in kitchen, bathroom, basement remodels, home additions & accessory dwelling units. 350+ homes transformed with expert craftsmanship & stress-free service.
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Buffalo Modular offers modular ADU pods priced $15,000–$40,000, delivered in 8 weeks. Uses include home offices, rental units & in-law suites. Features LVP flooring, Andersen windows, steel roof & HVAC. No foundation needed—just a shed permit & gravel pad.
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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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ADU Remodeling New York offers full-service interior & exterior home renovation, including kitchen remodeling, bathroom remodeling, and flooring installation. Serving residential clients with expert design-to-completion project management.
read moreNew York is one of the most densely populated states in the country, with a severe housing shortage that has driven lawmakers to actively encourage the development of Accessory Dwelling Units (ADUs). In 2022, New York State passed significant zoning reform measures as part of the state budget, requiring municipalities to allow ADUs on single-family and two-family residential lots. This landmark legislation has opened up tremendous opportunities for homeowners and ADU contractors in New York to help address the housing crisis, particularly in high-demand areas like New York City, Long Island, Westchester County, and the Hudson Valley.
Working with an experienced ADU contractor in New York is essential because regulations vary significantly depending on the municipality. New York City, for example, has its own set of rules under the NYC Department of Buildings (DOB), which governs permits, certificates of occupancy, and construction standards. In New York City, ADUs — often referred to as basement apartments or accessory apartments — must comply with the NYC Building Code, including strict requirements for ceiling height, egress windows, fire safety, and ventilation. Key regulatory considerations include:
Skilled ADU builders in New York are experienced in constructing a wide variety of accessory dwelling unit types to suit the state's diverse housing stock. From brownstone conversions in Brooklyn to detached garage apartments in suburban Westchester, New York contractors handle it all. Common ADU types include:
Hiring a licensed and insured ADU contractor in New York is not just recommended — it is legally required. New York State mandates that all contractors performing work over $500 must be licensed through the New York State Department of Consumer Protection or the relevant local licensing authority. A qualified contractor will manage the entire process, from permit applications and architectural drawings to final inspections and certificates of occupancy. Working with a professional ensures your ADU is built safely, legally, and in full compliance with all New York State and local building codes, protecting your investment for years to come.