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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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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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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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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Westchester Modular Homes Inc. builds modular accessory dwelling units (ADUs) in the Northeast. ADUs are secondary homes on single-family lots requiring permits, a kitchen, bathroom, and private entrance. ADUs can boost property value.
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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.
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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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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.
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.