Accessory Dwelling Units (ADUs) come in different forms, each offering unique benefits for homeowners looking to expand their property.
It may feel like a bit of an alphabet soup with acronyms like DADU, AADU, and JADU.
Here’s a quick guide to compare a DADU, AADU, and JADU.
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Comparing the Different Types of ADUs: JADU vS. DADU vS. AADU
What are the Different Types of ADUS?
The different types of ADUs include Detached ADUs (DADUs), Attached ADUs (AADUs), and Junior ADUs (JADUs).
Each type offers varying levels of privacy, cost, and integration with your existing property.
What is a DADU?
DADU stands for Detached Accessory Dwelling Unit. A Detached ADU (DADU) is a standalone structure built on your property, separate from the main house.
The definition of DADU is an independent living space that can range from a small studio to a full-sized house with multiple rooms.
It offers full amenities, including a kitchen and bathroom. They offer privacy and flexibility for homeowners.
DADUs are often referred to as a “tiny house in the back yard”, “backyard cottage” or “granny flat”.
What does a DADU cost?
A Detached Accessory Dwelling Unit (DADU) typically costs between $100,000 and $200,000.
The exact cost depends on several factors:
- location
- size of the unit
- materials used
- local labor costs
- permits
Custom designs and high-end finishes can increase prices, while simpler designs may reduce costs.
Who is a DADU Best for
A DADU is best for homeowners who want to add extra living space.
A DADU works well for families needing housing for:
- elderly relative
- adult children
- guests
- homeowners looking to create a small, affordable rental unit
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What is an AADU?
AADU stands for Attached Accessory Dwelling Unit. An Attached ADU (AADU) is physically connected to the main residence.
It may involve converting part of the existing home, such as a basement or garage, or building an addition.
Unlike a DADU, an AADU shares a wall with the primary home but typically has a separate entrance and utilities.
What does an AADU Cost?
The cost of an AADU (Attached ADU) typically ranges from $50,000 to $150,000, depending on factors such as size, materials, and local construction costs.
Renovating an existing space, like a garage or basement, tends to be more affordable while building an entirely new addition can increase the cost.
Local regulations, permits, and design preferences can also affect the final price.
Who is an AADU Best for
Homeowners who don’t have space for a detached unit but want to add:
- Living quarters to their home for family
- Office Space
- Rental purposes
What is a JADU?
JADU stands for Junior Accessory Dwelling Unit. A Junior ADU (JADU) is a smaller ADU, typically under 500 square feet. Technically a JADU is an AADU, just usually smaller.
A JADU is a converted space within the existing home, like a bedroom or attached garage.
It could share amenities, such as a laundry, with the main house, but must have its own JADU kitchen—at least an efficiency kitchen with a cooking appliance and sink.
What does a JADU cost?
JADUs are usually less expensive to create compared to DADUs or AADUs since they make use of existing space.
JADU costs can range from $10,000 to $50,000, depending on the level of renovation required and local regulations.
Who is a JADU Best for
It’s ideal for those with limited space who can convert part of their existing home, such as a bedroom or garage. Its lower cost and smaller footprint make it a practical option for budget-conscious homeowners.
Homeowners looking for:
- a cost-effective way to create a small living space
- ideal for guests
- elderly family members
- as a low-cost rental unit
Difference between ADU Vs. DADU
The main difference between an ADU and a DADU is that a DADU is completely detached from the main house, while an ADU can either be attached or detached.
Difference between ADU Vs. Junior ADU
The primary difference between an ADU and a Junior ADU is size and independence.
A standard ADU, whether attached or detached, functions as a fully separate living space, often with full utilities and a larger kitchen and bathroom.
A JADU, on the other hand, is smaller and may share some amenities with the main house, making it a more affordable option for homeowners.
Final Thoughts on Different Types of ADUs
Understanding the different types of ADUs will help you make the right choice for your property. No matter if you’re deciding between a DADU, AADU, or JADU.
Each option offers unique benefits and challenges depending on your space, budget and intended use.
A DADU provides privacy and flexibility as a standalone structure, an AADU integrates seamlessly with your existing home, and a JADU offers an affordable, space-saving solution.
By considering your needs and the available space, you can select the ADU that best aligns with your goals, whether for rental income, housing family members, or simply adding value to your property.
What permits are needed for an ADU?
You’ll need building, electrical, plumbing, and zoning permits. Check local regulations as requirements vary by city.
How long does it take to build an ADU?
ADUs typically take 3 to 12 months to complete, depending on the type (DADU, AADU, JADU), design complexity, and local permitting processes.
Can I rent out my ADU?
Yes, in most areas you can rent out an ADU for additional income, but local laws may have restrictions, especially for short-term rentals.
How much value does an ADU add to my property?
An ADU can increase property value by 20% to 35%, depending on location, size, and local demand for additional living space.
Can a JADU share utilities with the main house?
Yes, a JADU typically shares utilities, such as electricity and water, with the main home, making it more affordable to build.
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