ACCESSORY DWELLING UNIT

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Discover how SLK Buildings helps you unlock hidden space and income with expertly planned ADUs across New York City.

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Unlock The Potential of Your NYC Property with ADU

Your trusted partner in planning, permitting, and building Accessory Dwelling Units (ADUs)—from basement conversions to backyard cottages.

SLK Buildings | NYC Filing Representative

The Ultimate Guide to Building an Accessory Dwelling Unit (ADU) in NYC

Looking to build an Accessory Dwelling Unit (ADU) in New York City? Whether you are a homeowner, or real estate investor, you are in the right place. At SLK Buildings, we guide New Yorkers through the complex process of designing, permitting, and legalizing ADU’s that comply with NYC regulations and unlock new income potential. 

What is an Accessory Dwelling Unit (ADU)?

The Ultimate Guide to Building an ADU in NYC

Looking to build an Accessory Dwelling Unit (ADU) in New York City? Whether you’re a homeowner or real estate investor, SLK Buildings guides you through every step of designing, permitting, and legalizing ADUs that comply with NYC regulations—and create lasting value.

What Is an Accessory Dwelling Unit?

An ADU is a self-contained secondary housing unit located on the same lot as a primary residence. Common ADU types include basement apartments, garage conversions, detached backyard homes, and attic units. These spaces have their own entrance, kitchen, bathroom, and sleeping area, offering flexibility for rental income or multigenerational living.

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Why Add an ADU to Your NYC Property?

Why Add an ADU to Your NYC Property?

  • ✅ Generate rental income from unused space
  • ✅ Increase your property’s market value
  • ✅ Provide housing for extended family members
  • ✅ Support NYC’s housing goals
  • ✅ Access state and city financial incentives

Ready to Build Your ADU in NYC?

Let SLK Buildings guide you from zoning to final sign-off. No stress. Just clear steps and results.

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Popular ADU Types

Most Popular NYC ADU Types

  • 🏠 Basement Conversions — Legalize a finished basement as a rentable unit
  • 🏚️ Attic Conversions — Convert unused space into a functional upper-level dwelling
  • 🏡 Detached Backyard Units — Build a stand-alone structure where zoning allows

Key Considerations

Key Considerations When Planning an ADU in NYC

  • 🏘️ Zoning Compliance — Is your property eligible for an ADU?
  • 📋 Permit Requirements — What must be filed with DOB or FDNY?
  • 🛠️ Design Standards — Meet building codes and safety regulations
  • 💸 Incentives — Tap into grants or low-interest financing options

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The “Plus One” ADU program typically refers to an initiative aimed at encouraging the construction or conversion of 

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Households can earn up to 165% of the Area Median Income (AMI). Be single-unit, detached residential homes.

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ADU stands for Accessory Dwelling Unit. An ADU is a secondary housing unit on a single-family residential lot that 

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NYC Accessory Dwelling Unit (ADU) FAQs

Is my NYC property  eligible for an ADU?

Start with a Zoning Regulation and Building Code analysis. We will help you determine if your lot qualifies and what improvements are needed.

What permits are required?

Typically, you will need DOB work permits, and a Certificate of Occupancy .

How long does the process take?

From design to Department of Buildings sign off, timelines vary based on complexity, but usually it can be done between 3 to 6 months. We help to expedite filings, inspections, and reduce delays.

For more information please visit HPD Plus One ADU

Download the Free NYC ADU Starter Guide

Get everything you need to plan your first ADU ~ from the checklists and diagrams to cost saving incentives and permit requirements.

Get the Free PDF ➝

💬 Start My ADU Plan