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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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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DEN Outdoors offers modern house plans & prefab kits since 2020, including 40+ designs like cabins, A-frames & ADUs. Their 3-step process starts at $999, with building packages from $1,999 or prefab kits from $133K.
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Tiny House Titans is a Northeast ADU contractor founded in 2025, offering turn-key services from zoning to final inspection. Units range 200–1,000+ sq ft at $250–$400/sq ft, covering detached ADUs, garage conversions, and JADUs.
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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 m... read more
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, a... read more
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 & ... read more
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... read more
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... read more
ADU Haus NY builds fully permitted accessory dwelling units in New York City. Founded by Elai Azour, they handle design, DOB filings, and installation, ensuring compliance with NYC's City of Yes initiative and Local Laws 126 and 127.
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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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Timber Design & Build constructs ADUs across Hudson Valley, NY, serving Ulster, Dutchess, Orange & Sullivan counties. Offering detached, attached, garage conversions & over-garage units. Costs range $120–$400/sqft. Rental income pote... read more
NYC's 2024 City of Yes zoning reform introduced ADUs, allowing homeowners to add units in attics, basements, or backyards. Situ Studio contributed a pre-approved 280 sq. ft. detached micro-loft ADU design using Wikihouse's open-source plywood fram... read more
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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Dacaj Construction builds legal ADUs across NYC, Westchester & Nassau County. Specializing in garage, basement, attic & detached cottage conversions, they guide homeowners through zoning eligibility, DOB permits & certificate of occupa... read more
New 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.