NYC ADU eligibility comes down to a 5-filter test. Filter 1 — is the property an R-zoned one- or two-family home — is the qualifying gate; if you fail it, no ADU is possible. Filters 2 through 5 narrow which ADU types are viable but rarely disqualify a property outright. After applying all five, each ADU type carries its own additional rules.

NYC ADU rules are complex. Before you commit to design or construction, an ADU Feasibility Study gives you verified zoning, real floor plans, and an accurate cost estimate — so you know exactly what you can build and what it will cost.

The number one question we hear from homeowners considering an ADU isn't about zoning or permits. It's simpler than that - “Is it actually worth it?" Building an ADU in New York City is a real investment. Before you commit, you want to know what you'll get back, how long it takes to pay off, and whether the monthly cash flow actually makes sense for your situation.

How long does an ADU take from start to finish? Get a realistic timeline: 7-18 months total, with 6 months or less for construction after permits.

NYC Mayor Mamdani announced the launch of the ADU for You resource portal and the reopening of the Plus One ADU financial assistance program. Here’s what NYC homeowners need to know about building an Accessory Dwelling Unit (ADU), including eligibility, costs, and key considerations before getting started.

Should you renovate, build an addition, or create an ADU? Compare costs, ROI and benefits to find which option makes the most financial sense for your home.

Not every ADU has to be a rental. Learn how NYC homeowners are building backyard offices, art studios & creative spaces—and yes, it's allowed.

We analyzed six months of NYC ADU filing data, and our findings show ADU awareness is increasing among NYC homeowners, explosive momentum in Queens, and a clear preference in ADU configuration type.

Help your adult child save money while maintaining independence. Learn how NYC families are using ADUs to keep generations close without living on top of each other.

Can you rent your NYC ADU on Airbnb? Learn the rules for short-term vs long-term rentals, income potential & which option is legal for your ADU.

Fire sprinklers add $10K or more to NYC ADU projects. Learn when they're required, why they matter & what other fire safety features your ADU needs.

Avoid costly ADU mistakes. Learn the five biggest design and planning oversights NYC homeowners make, from ignoring flood zones to skimping on natural light.

Building an ADU for aging parents? Learn about accessibility, safety features, location and design choices that make multigenerational living work beautifully.

ADUs generate $20K-$40K/year in rental income and boost property value. Learn how NYC retirees are using ADUs as a retirement income strategy.

Turn your garage into a legal ADU. This step-by-step guide covers design, permits, construction and costs for garage conversion ADUs in NYC.

Building an ADU in the Bronx? Discover affordable options, financing help, and what's possible on your lot. Your complete guide to Bronx ADUs.

Explore ADU financing options: HELOCs, construction loans, grants and more. Your complete ADU financing playbook.

NYC ADUs require owner-occupancy—but what does that actually mean? Learn the rules, how they're enforced & what it means for your ADU plans.

Staten Island has the space for backyard cottages. Learn how to build an ADU on your SI property, costs, rules & what makes it the perfect opportunity.

Planning an ADU near the water? Flood zones affect what you can build in NYC. Learn the restrictions, which ADUs are allowed & how to check your property.