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Residential Infill Project and New Development Projects

Learn more about the Residential Infill Project and schedule a meeting to discuss. New Residential Infill Project policies went into effect Aug. 1, 2021. Find information about what the Residential Infill Project means for development projects.
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Watch the June 10th, 2021 Lunch & Learn on the Residential Infill Project.

The City of Portland adopted new rules that govern the types of housing permitted in our neighborhoods. The changes proposed by this project allow more housing options in Portland’s neighborhoods. This includes more accessory dwelling units (ADUs), duplexes, triplexes and fourplexes, and also new limits on size and scale. Learn more about the Residential Infill projects and how it works. Find out how to get answers to questions about your development project. Read questions and answers given through two Lunch and Learn sessions held in June 2021.

Residential Infill Project code changes give homeowners more options  

Two more code packages took effect on August 1, 2021. The Shelter to Housing Project updated Residential Infill's visitability requirements and the Design Overlay Zone Amendments may impact your project if it is in a design overlay zone:

Residential Infill Project code changes began on August 1, 2021. With the changes, homeowners and developers have a lot more options to add more units to a property or lot: 

  • We are expanding what you can do in "single family" zones
  • We want to make more accessible and less expensive housing available

More flexibility for how you use lots   

In zones R2.5, R5 & R7 the Residential Infill Project will add a lot of flexibility to build, including: 

  • Increase how many units you can build on each lot 
  • Increase the number of allowable configurations on lots 
  • Remove the off-street parking requirement in single-dwelling zones 

Limits to building size 

A new requirement to measure each building’s floor area ratio on the lot limits the size of buildings. Read more about the floor area ratio and how it might affect your project and understanding floor area in single-dwelling zones

Find out if your lot can have more units 

The z overlay map shows where more Residential Infill Project housing types are not allowed, even with the August 1, 2021 code changes. Lots in the z overlay have flooding or landslide hazards, or have significant natural resources on-site. The z overlay can be found at the Map App (on Portland Maps).

Why you can't add units to some lots 

You can't add units to some lots. For example: 

Minimum lot size requirements 

Minimum Lot Size 

  • Zone R2.5:  
    • Min lot size for 1-2 units = 1600sf  
    • Min lot size for 3+ units = 3200sf  
  • Zone R5:   
    • Min lot size for 1-2 units = 3000sf 
    • Min lot size for 3+ units = 4500sf 
  • Zone R7:   
    • Min lot size for 1-2 units = 4200sf 
    • Min lot size for 3+ units = 5000sf 

Visitability requirements  

For new construction with three or more units on the site, including ADUs, one building must be visitable. Visitability standards include:  

  • A no step, barrier-free main entrance. 
  • A bathroom and small living area accessible to the main entrance. 
  • 32-inch-wide internal doors between the entrance, the bathroom and the living area for wheelchair accessibility. 

Get answers to questions about the Residential Infill Project: talk with an expert 

We can answer questions about the new rules. You can set up a 15-minute appointment with a city planner or call the Zoning Information Line phone number to discuss your questions. Or, set up an Early Assistance meeting for a deeper discussion about the Residential Infill Project. 

More information about the Residential Infill Project 

We'll post new information about the Residential Infill Project to this webpage when it's available. The adopted code can be found here, if you want to view the detailed rules (remember the visitability requirements were changed with the Shelter to Housing Project linked above):

Learn more about the Residential Infill Project: 


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