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Second Key NYC

New York

ADU Builders

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https://www.secondkeynyc.com/

Second Key is a New York City-based ADU builder and licensed general contractor specializing in detached backyard accessory dwelling units across Staten Island, Queens, Brooklyn, and the Bronx. Founded by experienced NYC real estate developers, the company focuses on helping homeowners transform unused property space into functional, high-value living areas through streamlined and cost-effective ADU construction solutions.

With decades of combined experience in real estate development and construction, Second Key simplifies the ADU building process while delivering projects on time, on budget, and with transparent communication throughout every stage.

Detached ADU & Backyard Cottage Construction

Second Key specializes exclusively in detached accessory dwelling units designed for urban residential properties.

Services include:

Backyard ADU construction
Detached accessory dwelling units
Casitas and granny flats
Guest house and in-law suite development
Permit and zoning coordination
Full-service ADU project management
Design-build construction solutions

Their team helps homeowners maximize the utility and value of their properties while creating flexible living spaces for rental income, family housing, or multigenerational living.

Why Homeowners Choose Second Key

Specialized NYC ADU builder and contractor
Experience in Staten Island, Queens, Brooklyn, and the Bronx
Real estate and development expertise
Streamlined ADU planning and construction process
Transparent pricing and project management
Focus on maximizing property value and functionality

Second Key combines local construction knowledge with practical real estate insight to create efficient backyard housing solutions tailored to New York City properties.

A Mission Focused on Housing & Community

Second Key’s mission is centered on helping people remain in the communities they love by creating additional housing opportunities through ADU development. Their projects are designed to support multigenerational living, strengthen neighborhoods, and provide homeowners with new opportunities to generate wealth and long-term property value.

Whether building a detached backyard cottage, guest house, or income-producing ADU, Second Key provides homeowners with a practical and professionally managed approach to accessory dwelling unit construction in New York City.

Business Hours

Monday: 8:00 AM – 5:00 PM
Tuesday: 8:00 AM – 5:00 PM
Wednesday: 8:00 AM – 5:00 PM
Thursday: 8:00 AM – 5:00 PM
Friday: 8:00 AM – 5:00 PM
Saturday: Closed
Sunday: Closed

Service Area

New York City NY

https://www.linkedin.com/company/second-key-nyc/

157, 13th Street, Park Slope, Brooklyn, Kings County, New York, 11215, United States

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