Why Install an Accessory Dwelling Unit?People build ADU’s for lots of reasons, but the most common are rental income and/or to house relatives. Having a second unit is a simple and old idea to convert unused space. Second units are a relatively affordable type of construction, because they do not require purchasing land or major new infrastructure. With rents for a 1 bedroom typically averaging over $1600 / month in many areas of Southern California many people install an ADU to help pay off their primary mortgage or earn extra income. Can you use extra income or do you have a family member /friend that needs a place toLive?
ZoningADUs must be placed on single-family residentially zoned lots. ADUs are allowed in all residential zones.
In San Diego, companion units can also be permitted in multi-family lots under specific circumstances. They are allowed on lots where the maximum number of dwelling units is two. So, if you have, for example, a lot zoned RM1-1 with two units or less you may be able to add a companion unit. Multi-family can get complicated, so we recommend booking a free appointment with an ADU expert by calling 888-987-6638 to find out if your lot would qualify.
If your area is in a Coastal Overlay Zone, there may be additional regulations in order to protect our coasts.
Min/Max Building SizesYour maximum build size differs depending on whether your accessory unit is attached or detached from the primary home.
Attached ADU: The floor area of the ADU should not be more than 50% of the existing residence up to 1,200 square feet. For example, if your existing house in 2,500 sq. ft., the attached ADU cannot exceed 1,200 sq. ft. in size.
Detached ADU: For a detached ADU, the total floor space area of the ADU should not be more than 1,200 square feet, regardless of the size of the primary residence.
The floor area of the ADU should be included when calculating the total floor area of the lot.
RentalsCalifornia passed Senate Bill 1069 in an effort to increase the supply of housing to the state. For this reason, any accessory dwelling unit may be used for a long-term rental. ADU’s cannot be rented out for less than 30 consecutive days.
Accessory Dwelling Units starting at price USModular offers detached ADU’s starting at $88,465 for the ADU built to Federal Code, Delivery, Foundation, and Utility Connection to cities within Southern California. Permits, fees, grading , utility extensions are all site specific and will be determined once a plan is submitted to local building departmentModular home (CBC/Local) ADU on permanent foundation starting at $98,000
Manufactured home (Federal/HUD) ADU on a permanent foundation starting at $89,495
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