ADU Types Explained: DADU, JADU, Garage Conversion, and Interior Suite — Which Is Right for You?
In LA, ADU costs range from $50,000 for a JADU to over $300,000 for a detached unit — and the right choice depends on your lot size, budget, and goal. Understanding the four main types (DADU, JADU, garage conversion, and interior suite) before you start can save you months of delays and tens of thousands of dollars. According to IA Remodelings Market Research 2026, demand for ADUs in LA continues to grow as homeowners look to add rental income or multigenerational living space.
At a Glance: ADU in LA 2026
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|
|
|---|---|
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Average cost |
$80,000 – $300,000 |
|
Cost per sq ft |
$300 – $600 |
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ROI at resale |
Rental income: $1,800–$3,500/mo; adds $150K–$350K to property value |
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Typical timeline |
4–12 months including permits |
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Permit required |
Yes / Depends on scope |
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Local market factor |
1.00x national baseline |
How Much Does an ADU Cost in LA in 2026?
The cost of an ADU in LA can vary significantly depending on the type and size of the unit. Garage conversions can start at around $80,000, while DADUs can cost between $150,000 and $300,000. JADUs, which are conversions within existing homes, can be more affordable, with costs ranging from $50,000 to $100,000. Interior suites, which involve carving out living space within an existing home, can be the most cost-effective option, with costs starting at around $50,000.
Here's a comparison of the different ADU types and their costs:
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ADU Type |
Cost Range |
|---|---|
|
Garage Conversion |
$80,000 – $150,000 |
|
JADU |
$50,000 – $100,000 |
|
DADU |
$150,000 – $300,000 |
|
Interior Suite |
$50,000 – $100,000 |
DADU (Detached ADU): Separate Structure in Backyard
A DADU is a separate structure built in the backyard of an existing home. This type of ADU offers the most rental income potential and can be customized to fit the homeowner's needs. However, it also comes with the highest cost, ranging from $150,000 to $300,000. According to LA Building & Safety, the permitting process for DADUs can take several weeks, and homeowners must ensure that their property meets the necessary zoning and building code requirements.
AADU (Attached ADU): Addition to Existing Structure
An AADU is an addition to an existing home, sharing a wall with the main house. This type of ADU is less expensive than a DADU, with costs ranging from $150,000 to $300,000. AADUs are a good option for homeowners who want to add living space without building a separate structure. AADUs can also be designed to be energy-efficient, which helps reduce operating costs and increases the unit's overall value.
JADU (Junior ADU): Conversion within Existing Sq Footage
A JADU is a conversion of an existing room or space within a home, typically under 500 square feet. This type of ADU is the fastest to permit in CA and can be a cost-effective option, with costs ranging from $50,000 to $100,000. According to IA Remodelings Market Research 2026, JADUs are becoming increasingly popular among homeowners who want to add living space without breaking the bank.
Garage Conversion: Popular in LA
Garage conversions are a popular option in LA, as they involve converting an existing garage into a living space. This type of ADU can be a cost-effective option, with costs ranging from $80,000 to $150,000. As mentioned in the NAHB Remodeling Market Index, garage conversions can also increase the value of a property and provide a high return on investment.
Interior Suite: Carving Out Living Space Inside the Home
An interior suite involves carving out living space within an existing home, without adding any new structures. This type of ADU can be the most cost-effective option, with costs starting at around $50,000. Interior suites can also be designed to be energy-efficient, which helps reduce energy costs and increase the unit's overall value.
Decision Framework: Match ADU Type to Lot Size, Goal, and Budget
When choosing an ADU type, it's essential to consider the lot size, goal, and budget. Here are some factors to consider:
- Lot size: If you have a large backyard, a DADU or AADU may be a good option. If you have a smaller lot, a JADU or interior suite may be more suitable.
- Goal: If you want to generate rental income, a DADU or AADU may be a good option. If you want to add living space for family members, a JADU or interior suite may be more suitable.
- Budget: If you have a limited budget, a JADU or interior suite may be a good option. If you have a larger budget, a DADU or AADU may be more suitable.
The Bottom Line
When it comes to choosing an ADU type, it's essential to consider your specific needs and budget. If you're looking for a cost-effective option, a JADU or interior suite may be a good choice. If you're looking for a unit with high rental income potential, a DADU or AADU may be a better option. Whatever your needs, it's essential to work with a reputable contractor who can guide you through the process and ensure that your ADU is built to code and meets your specific requirements.
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