Accessibility: One-story ADUs are typically more accessible for individuals with mobility limitations or elderly residents who prefer to avoid stairs.
Design Flexibility: One-story ADUs offer greater flexibility in terms of layout and interior design, as there are no constraints imposed by stairs or multiple levels.
Construction Cost: Generally, one-story ADUs tend to have lower construction costs compared to two-story ADUs, as they require less materials and labor for the foundation and structural elements.
Maintenance: With a single level, one-story ADUs often have fewer maintenance requirements, making upkeep and repairs more manageable.
Drawbacks:
Limited Space: One-story ADUs may have a smaller footprint due to the restriction of building on a single level. This could potentially limit the available living area, especially if the property has a smaller lot size.
Reduced Privacy: Depending on the layout and neighboring structures, one-story ADUs may have less privacy compared to two-story units, particularly if they are overlooked by taller buildings or adjacent properties.
Land Utilization: Constructing a one-story ADU may not make the most efficient use of the available land, especially if the property has limited space. A two-story ADU might offer the opportunity to maximize square footage while minimizing the footprint.
Two-Story ADU (Benefits and Drawbacks):
Benefits:
Increased Living Space: Two-story ADUs generally offer more living space due to the vertical design, allowing for additional rooms, bedrooms, or storage areas on the upper level.
Enhanced Privacy: The vertical separation provided by a two-story ADU can offer improved privacy, especially if windows or living areas are situated away from neighboring properties or street views.
Potential Rental Income: The additional living space in a two-story ADU may attract higher rental rates or the ability to accommodate multiple tenants, potentially increasing the income potential.
Drawbacks:
Construction Cost: Building a two-story ADU typically involves higher construction costs due to the additional materials, structural requirements, and labor involved in constructing a second level.
Accessibility Challenges: Two-story ADUs may pose challenges for individuals with mobility issues or aging residents who prefer to avoid stairs. Retrofitting for accessibility, such as installing an elevator or chairlift, can add to the construction and maintenance costs.
Maintenance and Upkeep: With multiple levels, two-story ADUs can require more maintenance and repairs over time, including upkeep of staircases, balconies, or exterior features.
It’s important to consider the specific needs, lot size, budget, and local regulations when deciding between a one-story or two-story ADU. Both options have their advantages and drawbacks, and choosing the most suitable design will depend on individual preferences and circumstances.
To estimate whether you need an electrical upgrade to build your ADU
