Overview
Building an accessory dwelling unit (ADU) is one of the best ways to raise the value of your home, make money from rentals, or add more living space. However, deciding between an attached and detached ADU is one of the most crucial choices you will have to make. Both options have their advantages and the right choice depends on your objectives, financial situation, and available space.
What is a Detached ADU?
A detached ADU is a self-contained structure built on the same lot as the main house, but separate from the main house. It functions as an independent living space, often including a kitchen, bathroom and separate entrance.
Benefits of a Detached ADU
Maximum privacy – because the ADU is separate from the main house, it provides more privacy for both owner and occupants, making it ideal for rental or multi-generational living.
Higher rental value – a detached ADU usually brings in more money from rentals than an attached ADU because it is autonomous.
Versatile use – perfect for a home office, art studio, guest house, rental apartment, or gym without disturbing the main household.
Things to Consider
More land required – A detached ADU requires ample yard space, so it is best used on larger lots.
Higher construction costs – Since a detached ADU requires a separate foundation, plumbing and utilities, it usually costs more to build.
Longer approval process – Some cities have stricter zoning regulations for detached ADUs, which may require additional permits.
What is an Attached ADU?
An attached ADU is directly connected to the main house, either as an addition or as a remodeled part of an existing structure.
Benefits of an Attached ADU
More affordable – because an attached ADU utilizes existing walls, utilities and structures, it is usually less expensive to build than a stand-alone unit.
Easier permitting – attached ADUs often have fewer zoning restrictions, making the permitting process quicker and easier.
Great for family use – if you want to house aging parents, adult children, or caregivers, an attached ADU will provide close proximity while retaining some independence.
Things to Consider
Less privacy – sharing a wall with the main home may result in increased noise transmission and less privacy for residents.
Limited design flexibility – as the ADU extension must integrate with the existing house, the design options may be more limited than a detached dwelling.
Potential impact on the main house – the house extension may affect natural light, ventilation and the overall aesthetics of the site.
Which ADU Option is Right for You?
If you prioritize privacy, rental income or dedicated workspace, a detached ADU is a great investment.
If, however, you're looking for a cost-effective, easy-to-resolve solution suitable for family members or caregivers, an attached ADU is a better choice.
No matter which option you choose, EG Modern Construction is here to help you make your dreams a reality. Choose which type of ADU is right for you and let's build!