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Resource Library
Everything you need to know about building an Accessory Dwelling Unit in New York City — from eligibility and financing to permits, construction, and rental income.
New to ADUs? Start here to understand eligibility, types, and costs.
Use our free tool to check your NYC property's ADU eligibility in under 2 minutes based on zoning, lot size, and building class.
Understanding the legal distinctions between ADUs and basement apartments under Local Laws 126 and 127 of 2024.
Complete cost breakdown for basement conversions, garage conversions, and detached new-construction ADUs in NYC.
Answers to the most common questions about eligibility, costs, plans, permitting, construction, and rental income.
Learn about the Plus One ADU Program and other ways to finance your build.
How to access the city's low-interest financing program for ADU construction, including eligibility and application steps.
HELOC vs home equity loan vs Plus One vs construction loan — which financing option is right for your ADU project?
Explore HPD pre-approved plans and understand design requirements.
Browse the full catalog of city-approved ADU designs from top architecture firms, with cost estimates and specs.
What fire safety and sprinkler systems are required for your ADU under NYC building code.
Step-by-step guidance through the DOB permitting and construction process.
A complete walkthrough of the DOB NOW filing process for ADU work permits, from account setup to approval.
Realistic timelines for design, permitting, construction, and inspections for every ADU type.
Visual overview of the end-to-end ADU permitting workflow in NYC.
Homeowner vs landlord policies, detached structure riders, and liability coverage for your ADU.
Every document you need for your ADU permit application in one organized checklist.
Neighborhood-specific guides covering zoning, lot sizes, and local considerations.
ADU opportunities in Manhattan's eligible low-density zones, including northern Manhattan neighborhoods.
Brooklyn's massive ADU potential: Canarsie, East New York, Flatlands, Bay Ridge, and more.
Deep dive into Canarsie's R3-2 and R4 zoning, typical lot sizes, and ADU conversion potential.
East New York's low-density zoning, large lots, and strong ADU candidacy analyzed.
Queens leads NYC in ADU eligibility: Flushing, Jamaica, Bayside, Fresh Meadows, and more.
Flushing's eligible zones, typical lot configurations, and Plus One financing opportunities.
Jamaica's large lots and R3/R4 zoning make it one of the best ADU neighborhoods in NYC.
Staten Island's detached homes and generous lot sizes create ideal conditions for ADUs.
Tottenville's R1/R2 zoning, large lots, and strong potential for detached backyard ADUs.
The Bronx's eligible neighborhoods in the eastern and northern sections of the borough.
Understand the financial returns from your ADU investment.
A step-by-step checklist covering eligibility, design, permits, financing, and construction. Everything you need to go from idea to move-in ready.
Check if your property qualifies in under 2 minutes, then explore pre-approved plans and financing options.