Split Level Accessory Dwelling Unit: Exterior Attached Addition

Description of Conversion

The Exterior Attached Addition’s placement is dependent on the property’s slope. As long as the addition is within the zoning laws, the ADU isn’t limited by existing space. This allows for more flexibility to create a space that is ADA accessible while also allowing the ADU to be accessed from within the existing home.

Pros and Cons 


  • Space is less limited 
  • Don’t need to worry about fitting within an existing parameter
  • Won't be losing existing space within the existing house
  • Availability to extend and connect into existing plumbing, electrical, and HVAC
  • Family member will be under the same roof

  • Cons

    • Space to build is limited by local zoning 
    • Need to extend existing plumbing, electrical, and HVAC 
    • New construction, from foundation to facade 

Options for Conversion: 

On the pages that follow, take a closer look at housing's connections to the Interior Conversion, and Freestanding New Structure.

Interior Conversion »

Freestanding New Structure »

Five Bay»



Side Hall»

Split Level»

Garage Conversion»

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One Empire Plaza
Providence, RI 02903

RI Alliance for Healthy Homes

A project of
HousingWorks RI