The 10 ADU builders from Google's results for New York, New York, ordered by Google rating weighted by review count. No firm pays to be listed or ranked.
Last updated
Licensing in New York. New York has no statewide contractor license. New York City requires a Home Improvement Contractor license from DCWP.
on GooglePlaya Del Rey, CA
Katz Design & Builders constructs custom accessory dwelling units in Westchester and nearby Los Angeles neighborhoods from Playa Del Rey. Its ADUs include attached units such as above-garage apartments as well as standalone backyard structures.
(213) 444-7636 316 Culver Blvd, Playa Del Rey, CA 90293
on GoogleWoodland Hills, CA
Gather ADU is an ADU builder based in Woodland Hills, California.
(323) 591-3717 22238 Flanco Rd, Woodland Hills, CA 91364
on GoogleFresh Meadows, NY
Working from Fresh Meadows, Queens, this New York City firm designs, builds and legalizes ADUs. Alongside construction and renovation, it offers architecture and property legalization work with the DOB, ECB and HPD, covering garage conversions, basement apartments and backyard cottages.
(917) 463-7241 77-16 164th St #201, Fresh Meadows, NY 11366
on GoogleNew York
Haven ADUs offers pre-engineered plans for backyard ADUs on New York City lots, ranging from 350 to 800 square feet. Its designs are submitted to the city's DOB Plan Library under City of Yes, aiming to shorten design review for homeowners.
on GoogleCentral Islip, NY
Cascella & Sons Construction Corp designs and builds ADUs across Long Island from Central Islip. Units serve as in-law suites, rental apartments, guest houses or private home offices, planned to match the existing home and meet local zoning and building rules.
(631) 582-0100 70 Carleton Ave, Central Islip, NY 11722
on GoogleBrewster, NY
WMH Construction is a modular builder in Brewster, New York, that produces ADUs along with full homes. Its smaller units include in-law suites plus housing for caretakers, farms, schools and camps, built using factory construction.
(845) 278-1700 1995 NY-22, Brewster, NY 10509
on GoogleNew York
Sweeten works on home additions and ADU projects in New York.
New York
New York
OneBuild works on accessory dwelling units in the Hudson Valley region of New York. The company covers feasibility checks against each town's zoning rules, ADU design, financing questions and construction, and publishes notes on how local ADU regulations differ from one municipality to the next.
New York
Tiny Dream Homes, run by builder Bob Small, offers consulting and building services for accessory dwelling units in Westchester. Homeowners in New York, Connecticut, Rhode Island and Massachusetts can hire him directly to guide an ADU project rather than going through a sales team.
In New York, a garage conversion ADU typically costs $78,000 – $195,000. Remodeling labor in New York runs about 30% above the US median, which accounts for most of the difference from the same project elsewhere.
These are the firms from Google's results for "adu builders new york city", with directories, chains and suppliers removed. They are ordered by Google rating weighted by review count, and the ratings shown are Google's. No firm pays to be listed or ranked. The list was last updated in October 2026.
It depends on your city and state. California, Oregon and Washington have state laws that make ADUs allowed on most single-family lots. Elsewhere it is set by local zoning, so check lot size, setback and owner-occupancy rules with your city first.