Garage Door Repair Professionals In Manchester NJ
Garage Door Repair Professionals In Manchester NJ

Difference between Primary Dwelling and Accessory Dwelling?

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The primary dwelling is the main residential unit and an accessory dwelling is comparatively smaller in size, which is detached or attached to the main residential unit.

If you are looking for a trusted contractor for your ADU garage conversion San Jose, then you should visit Now, let us understand the difference between primary dwelling and accessory dwelling.

What makes an accessory dwelling different from a main residential unit?

ADUs are secondary housing units located on a single family residentially zoned lot . They can be attached or detached from the main residential unit.

Difference in square footage

The average single family house in the United States has overall increased in size since 2000, which reached its peak of 2,467 square feet in 2015 before falling to 2,273 square feet by 2021.

On the other hand, an ADU can be built on a maximum area of 1200 sq. ft, which is a major difference between an ADU and a main residential unit.

Other attributes that distinguish ADUs from main residential building:

  • ADUs are typically smaller than the main residence.
  • An ADU includes a fully functional kitchen unit and bathroom.
  • It can be attached or detached from the main residential unit, can be built over an attached or detached garage, or can be built as a separate structure standing apart from the main residence.
  • An ADU must have a separate entrance from the outside, and usually does not have a way to enter directly from the main residence.
  • ADUs do not have a separate address or mailbox from the main residence.

Types of ADUs:

Attached ADU

Attached ADUs can be built as a part of your main residential unit and are attached to your main building. You can extend a portion of your house by breaking the walls and building an ADU, which is attached to the main building. This unit can be used as a study room, a recreational unit, or a living room

Detached ADU

As the name suggests, a detached ADU is built as a separate house at a certain distance from the main residential unit. Remember, an ADU can be built at a minimum distance of 4 feet from the main building as per the ADU ordinance. This unit is completely a separate unit that has a kitchen, a bedroom, and a bathroom.

Garage conversion ADU

Garage conversion ADU is built by converting the garage space into a separate unit. You can also build an ADU over your garage, which can be a great idea to convert the garage into an ADU. This can be used in many ways. You can use this as a separate dwelling unit for your parents, caretakers, or guests.

Basement conversion ADU

With basement conversion ADU, you will need to add only walls, windows, and doors as the structure are already available. So, you can convert your basement into an ADU. You can build a living room, an office, or a library in this space. Moreover, you can save excavation and construction expenses with this type of ADUs.

Junior ADU:

It is a small-size ADU that is perfect for smaller accommodations. This type of accommodation helps increase the value of your home and is typically built on an area of 500 square feet.

If you have limited space available in your home, you can build a detached Junior ADU to resolve the space issues in your home. This unit requires a separate entrance, an efficient kitchen, and sanitation facilities.


ADU unit is a useful addition to your home whether it is attached or detached to your main residence. However, you have to abide by the rules and regulations that apply to your area.

If you are not aware of the ADU ordinance then you can take the help of our professionals who are skilled enough to guide you with all the required information.

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