An accessory dwelling unit (ADU) can give homeowners more space and a new income stream.

Accessory dwelling units are emerging as a valuable option for California homeowners seeking additional income or expanded living space on their existing properties.

These secondary housing units, commonly known as granny flats or in-law suites, can be constructed as attached or detached structures and typically feature up to two bedrooms, though some jurisdictions limit them to one-bedroom or studio configurations.

Construction costs for ADUs range from $40,000 to $400,000, with most projects averaging around $200,000.

The investment can provide homeowners with rental income while simultaneously addressing California's ongoing housing shortage by increasing housing density without requiring new land development.

For property developers and investors, ADUs represent an opportunity to maximize the potential of existing residential lots, particularly in high-demand markets where traditional expansion is limited by zoning restrictions.

California's regulatory environment has become increasingly favorable toward ADU development in recent years, with streamlined permitting processes and reduced restrictions making these units more accessible to homeowners.

The dual benefit of generating rental income while adding property value makes ADUs particularly attractive in California's expensive housing market, where homeowners are seeking creative solutions to offset mortgage costs and property taxes while contributing to the state's housing supply.