Usable space
Review room proportions, access and available daylight. Existing square footage needs to support a complete living arrangement, not just a bedroom.
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Interior Conversion ADU
Find a new home within the space you have.
An interior conversion explores whether existing rooms or a portion of the home can become an independent dwelling. It is a design pathway to assess, not a promise that every unused room can be converted.
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What does interior conversion ADU mean?
It creates an independent dwelling from suitable space inside an existing building, such as a portion of a home. The term describes a conversion approach, not a separate permission to use any spare room as housing.
Who might consider it?
Owners with underused interior space who want to compare a full conversion, a JADU and an ordinary remodel.
Decisions worth making early
Shared building systems
Identify how changes relate to the rest of the home. Technical review should follow the proposed layout before decisions become difficult to reverse.
Living through the work
Discuss access and the household’s use of the property during construction. Work inside an occupied home needs a practical sequence.
Services for this project
The ADU type describes what you want to create. Services describe the design, documentation and construction work needed to get there.
Your questions, answered
What is an interior conversion ADU?
It creates an independent dwelling from suitable space inside an existing building, such as a portion of a home. The term describes a conversion approach, not a separate permission to use any spare room as housing.
How is it different from renting out a bedroom?
An ADU provides independent living facilities, including cooking and bathroom facilities. Renting a bedroom within the main home is a different arrangement and does not turn that room into a permitted ADU.
What if the space has limited light or awkward access?
These can be major design constraints. Review openings, circulation, room proportions and the technical work needed before committing to a conversion. Sometimes another ADU configuration offers a better solution.
Compare another option
Compare all ADU types
How could an ADU work for you?
Tell us who it is for
Family, your own home or a potential rental each brings different priorities. Discuss independence, access, privacy and the rooms you need.
Review the property
Share the address, photographs and available drawings. Identify the permitting agency and investigate the existing buildings, access, utilities and site constraints.
Compare a realistic scope
Explore suitable configurations and the work each requires. Compare design, consultant work, fees, construction and site improvements rather than a headline price alone.
Develop the selected option
Agree the design and documentation scope, prepare the required application and address review comments. Construction follows the necessary approvals and a defined construction agreement.
Definitions checked against California HCD guidance. Property-specific requirements need individual review.