What actually is a JADU?
It is interesting to note here that after the adoption of the Assembly Bill No. 68 and 881, California homeowners are now allowed to build both a JADU and a Regular accessory dwelling unit within a property. A Junior ADU can be up to the size limit of 500 square feet and built within a single-family residence structure. It should have a separate entry point and NO parking is required for a JADU. It is also a legally rentable unit. On the contrary, if you go to convert a garage into a JADU, only then a replacement parking is required. Otherwise, if you are building it from scratch without touching the existing parking lot or garage, a new parking space is not required. JADUs are exempt from all parking requirements.
To make it more simpler for you to understand, a Junior ADU (JADU), attic conversion or a basement conversion are all part of accessory dwelling unit interior conversion activities. Since there are NO basements in California homes, we need not have to worry about this particular feature. Attic and garage conversion are the two most popular types of interior conversion at space restricted homes. Such spaces are converted into art studios, home office, gymnasium and Yoga centers.
Here is a table outlining the different types of JADUs (Junior Accessory Dwelling Units), their descriptions, and estimated costs:
| Type | Description | Estimated Cost Range |
| JADU Type A | A JADU Type A is created by converting existing habitable space within a single-family dwelling or accessory structure, up to a maximum of 500 square feet or 40% of the primary dwelling’s living area, whichever is less. A JADU Type A may have separate exterior access or share a common entrance with the primary dwelling. | $20,000 – $100,000 |
| JADU Type B | A JADU Type B is created by constructing an addition to an existing single-family dwelling, up to a maximum of 500 square feet or 40% of the primary dwelling’s living area, whichever is less. A JADU Type B must have a separate exterior entrance. | $50,000 – $200,000 |
| JADU Type C | A JADU Type C is created by converting an existing garage or other accessory structure, up to a maximum of 500 square feet or 40% of the primary dwelling’s living area, whichever is less. A JADU Type C may have separate exterior access or share a common entrance with the primary dwelling. | $30,000 – $150,000 |
It’s important to note that the actual cost of a JADU will vary based on several factors, such as the size of the unit, the materials and finishes used, and the extent of any necessary modifications or upgrades to the existing structure. Additionally, costs may vary based on location and other local factors, such as permit fees and labor costs.
How are interior spaces converted to ADUs?
Converting interior spaces into Junior Accessory Dwelling Units (JADUs) is a seamless and efficient process with our expert guidance. Our team of skilled structural engineers begins by designing a custom plan tailored to your needs. From conceptualizing the master plan to obtaining all necessary permits and approvals, we handle every step, ensuring a hassle-free experience. Often, underutilized spaces like attics are transformed into functional living areas equipped with all essential amenities.
Interior ADU conversions offer comprehensive housing solutions, particularly in urban areas where space is at a premium. These conversions are more cost-effective than building a detached ADU, as they utilize existing structures, eliminating the need for new foundations, walls, or roofs. This makes interior ADUs an affordable option for homeowners. Additionally, various financing options are available to make the process even more accessible.
Choosing a local ADU conversion contractor like us ensures that you get innovative design options and quality construction for your new living space. An interior ADU can serve multiple purposes, from a cozy kitchen or bathroom to an extra living room, providing additional space and significantly boosting the resale value of your property.
If you’re considering a JADU or an interior ADU conversion in the Bay Area, we are here to help. According to a recent study, converting interior space into an ADU can increase your property’s value by as much as 51%. This is not just a home improvement project—it’s a strategic investment for your future. Moreover, the rental income generated from your new ADU can help cover your mortgage and other financial commitments, making it a wise choice for both short-term benefits and long-term growth.
A JADU is a smaller ADU, up to 500 sq. ft., created within the existing home. It usually includes an efficiency kitchen and may share a bathroom with the main house, unlike a standard ADU, which is a separate unit.
No, JADUs share utilities with the main house, reducing costs and simplifying the conversion process.
Yes, JADUs can be rented out, but some local regulations may require that the homeowner lives on the property, either in the main house or the JADU.