Unlock Your Property’s Full Potential

SEE HOW IT WORKS

Trusted ADU Experts
for NYC Homeowners

We help New York City homeowners turn underused space into beautifully designed ADUs (Accessory Dwelling Units), adding value, comfort, and opportunity to their properties. From the first feasibility check to the final Certificate of Occupancy, our expert team is by your side through every step of the process. In the City That Never Sleeps, we don’t rest until your ADU feels like home.

Second Key offers a full-service solution that includes ADU planning, design, permitting and construction. Send us your address and we'll provide a complimentary ADU assessment to show you what’s possible.

FIND OUT MORE
Second Key ADU (Accessory Dwelling Units)

Make Every Square Foot Count
Start Your ADU Journey Today!

START NOW
Second Key ADU (Accessory Dwelling Units) Tiny Home

A Seamless Process

  • The NYC ADU Process

    Feasibility & Planning

    Wondering if your New York City property is suitable for an ADU? Request a free ADU assessment and we’ll help you understand your property’s potential and what type of Accessory Dwelling Unit you can build.

    We make the process easy to understand and stress-free to begin.

  • ADU NYC

    Financing

    We assist you in the budgeting process and connect you with lending partners familiar with ADU construction in New York.

    Pre-approval for an ADU loan is often easier than homeowners expect, helping you secure funding quickly and confidently for your project.

  • ADU Floorplans NYC

    Design, Permit, & Build

    Once you're ready, we’ll finalize your ADU design, submit plans, and prepare your site for construction. Choose from pre-designed layouts with clear pricing or configure a custom unit.

    Our team of licensed architects, engineers, and contractors manages everything in-house, ensuring your project stays organized and on schedule. Typical ADU projects are move-in ready six months or less after permit approval.

    Get started today.