The NYC ADU Knowledge Base
Cut through the complexity with clear, reliable information on building your Accessory Dwelling Unit in NYC.
How Long Does It Actually Take to Build an ADU in NYC? A Realistic Timeline
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.
ADU For You & ADU Plus One ADU News Recap: Latest Accessory Dwelling Unit Laws, Costs & Trends (2026)
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.
ADU vs. Renovation vs. New Addition: Which Makes the Most Financial Sense?
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.
Using an ADU as a Home Office or Studio: Yes, it's Allowed in NYC
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.
Are ADUs Catching On in NYC? Here’s What the Data Says So Far
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.
ADUs for Adult Children: How NYC Families Are Keeping Generations Close
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.
Renting Out Your ADU on Airbnb vs. Long-Term: Which Makes More Sense in NYC?
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.
ADU Sprinkler and Fire Safety Requirements in NYC: What You Actually Need
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.
Five Common ADU Oversights NYC Homeowners Make (And How to Avoid Them)
Avoid costly ADU mistakes. Learn the five biggest design and planning oversights NYC homeowners make, from ignoring flood zones to skimping on natural light.
Designing an ADU for Aging Parents: What to Think About Before You Build
Building an ADU for aging parents? Learn about accessibility, safety features, location and design choices that make multigenerational living work beautifully.
ADU as a Retirement Strategy: How NYC Homeowners Are Building Passive Income
ADUs generate $20K-$40K/year in rental income and boost property value. Learn how NYC retirees are using ADUs as a retirement income strategy.
Garage Conversion ADUs in NYC: A Step-by-Step Visual Guide
Turn your garage into a legal ADU. This step-by-step guide covers design, permits, construction and costs for garage conversion ADUs in NYC.
The Bronx ADU Guide: Affordable Options and What's Possible on Your Lot
Building an ADU in the Bronx? Discover affordable options, financing help, and what's possible on your lot. Your complete guide to Bronx ADUs.
How to Pay for an ADU Without Draining Your Savings: A Financing Playbook
Explore ADU financing options: HELOCs, construction loans, grants and more. Your complete ADU financing playbook.
Owner-Occupancy Rules for NYC ADUs: What They Mean (and Why They Matter)
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.
Building a Backyard Cottage in Staten Island: Everything You Need to Know
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.
ADUs in Flood Zones: What NYC Homeowners Need to Know Before They Build
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.
ADU Options for Queens Homeowners: Basement, Garage and Backyard Cottages
Queens homeowners have 3 ADU options: basement conversions, garage ADUs and backyard cottages. Discover which works best for your property & how to start.
Thinking About Building an ADU in NYC? Here’s What to Know First
Thinking about building an ADU in New York City? Here’s what you should know.
What Is an ADU — And Why Should You Care?
What is an ADU in NYC? Why should you care? Read on to learn more.