Building FAQs

An Accessory Dwelling Unit (ADU) is defined as an attached or detached residential dwelling unit that provides complete independent living facilities for one or more persons.

An ADU must include permanent living, sleeping, eating, cooking and sanitation provisions on lots that are zoned to allow single-family or multi-family residential uses that include an existing or proposed dwelling. An ADU can also include an efficiency unit, or a manufactured home (on a permanent foundation only.).

There are different types of ADUs. You will need to research which one will meet your needs, budget, style, and property constraints.

• Converted Space ADU
  Existing square footage of existing house, garage or combination of both remodeled into an independent living unit. Learn more...
• Attached ADU
  New square footage added, sharing at least one wall with the primary residence into an independent living unit. Existing wall(s) may need alterations to create a fire wall. Learn more...
• Detached ADU
  The unit is separated from the primary structure. It can be custom built or a pre-fabricated (manufactured home) with certain restrictions. See Municipal Code 9.08.110 for the requirements. Learn more...
• Pre-Approved Detached ADU
  There are 7 plans available with multiple exterior options available. Learn more...
• Junior ADU
  Existing space (500 square feet or less) contained entirely within an existing or proposed single-family residence. Learn more...

Yes, you are required to obtain a permit before you can begin construction on your ADU project. Review the applicable ADU checklist and other documents on the ADU Home page and ADUforYOU for further guidance.

Moreno Valley offers pre-approved construction plans. There are 7 plan styles available with various exterior options. Learn more...

You must still hire a knowledgeable architect or designer to customize the City template sheets per your selected design, create a scaled site plan per ADU site plan requirements, include Title 24 sheets, and other items. See ADU Homepage for the checklists and guides.

Yes, all ADUs except Jr ADUs will need a new address. Prepare and submit an Address Request online through SimpliCITY.

The request must include a Plot Plan (dimensioned and drawn to scale) and shall detail the placement of the ADU on the property.

Yes, you can legally rent out your ADU. However, no short-term rentals are not allowed in Moreno Valley. The property owner will be required to obtain a business license for the rental property.

Yes, an ADU will increase your property value / assessment. An additional living space enhances the functionality of your property and can make it more attractive to potential buyers.

Yes, if you build a free standing ADU, State Law requires that it have solar panels.

Yes, A tiny home can be an ADU if it is attached to a permanent foundation and does not have wheels.

No, ADUs cannot be mobile. They must have a permanent foundation.

• A house/travel trailer (fifth wheel, motorized recreation vehicle, camper, tent trailer).
  
• A tiny home that is on wheels and not on a permanent foundation.
  
• An uninsulated garden shed (not designed as code compliant habitable space)

The plan review & inspection/permit cost for an ADU depends on multiple factors. Costs vary depending on:

• Type and size of ADU
  
• Special Districts annexation fees
  
• Fire sprinkler plan submittal & permit fees (if required)
  
• Public Works Grading plan submittal & permit fees (if required)
  
• Other outside agencies

To get an accurate cost estimate, contact the Building & Safety, Fire, Public Works, Planning and Special Districts departments once you have a conceptual plan (type of ADU, location, square footage, etc.).

Please check fees with these entities (**varies based on your city location):