Second Key primarily refers to two distinct companies in the housing and property sectors, as well as a specialized marketing firm.
Because the name is shared across different industries, the exact entity depends on your specific context: 1. Second Key NYC (Accessory Dwelling Unit Construction)
Second Key NYC is a specialized design and construction firm based in New York City. The company helps homeowners capitalize on NYC’s updated “City of Yes” zoning regulations by converting underused property spaces into legal housing.
Core Focus: Designing, permitting, and building detached, backyard Accessory Dwelling Units (ADUs), garage conversions, and basement apartments.
Service Model: They manage the entire timeline—from initial property flood map and zoning checks to filing permits with the NYC Department of Buildings (DOB) and final construction.
Coverage Area: Property owners across Brooklyn, Queens, Staten Island, and the Bronx. Homeowners can access their NYC ADU ROI Calculator to project potential rental incomes. 2. Second Key Ltd (UK Holiday Let Management) SECOND KEY LIMITED overview – Companies House – GOV.UK
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