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  • Writer's pictureFilament Management

Consider the Pros & Cons of adding a secondary dwelling unit ( SDU ) to your home

As the cost of living in many cities continues to rise, more and more homeowners are considering building accessory dwelling units (ADUs) or secondary dwelling units (SDUs) on their property to provide additional living space or rental income. While these units can have many benefits, there are also some potential drawbacks to consider. In this blog post, we'll explore the pros and cons of ADUs and SDUs.


  1. Rental income: One of the most significant benefits of ADUs and SDUs is the potential to generate rental income. By renting out the unit, homeowners can offset their mortgage payments and earn extra income.

  2. Increased property value: Building an ADU or SDU can increase the value of your property. This can be especially beneficial if you plan to sell your home in the future, as the added living space can make your property more attractive to potential buyers.

  3. Additional living space: ADUs and SDUs can provide additional living space for family members or guests. This can be particularly helpful if you have aging parents or adult children who need their own space.

  4. Sustainability: Building an ADU or SDU can be an environmentally sustainable option. By creating additional housing units in existing neighborhoods, you can reduce urban sprawl and carbon emissions associated with new construction in undeveloped areas.


  1. Cost: Building an ADU or SDU can be expensive, with costs varying depending on the size, materials, and location of the unit. In addition, there may be fees for permits, inspections, and utility connections.

  2. Zoning and building codes: Depending on where you live, there may be zoning and building codes that limit the size and design of ADUs and SDUs. It's important to research local regulations before beginning construction.

  3. Maintenance: ADUs and SDUs require regular maintenance, which can add additional costs and responsibilities for homeowners. This includes things like cleaning, repairs, and landscaping.

  4. Neighborhood opposition: Some neighbors may be opposed to the construction of an ADU or SDU in their neighborhood, as it could potentially impact property values, parking, and neighborhood character.

In conclusion, ADUs and SDUs can provide many benefits, including additional income and living space, as well as potential sustainability advantages. However, it's important to carefully consider the potential drawbacks, such as cost, zoning and building codes, maintenance, and neighborhood opposition. By weighing the pros and cons, homeowners can make an informed decision about whether an ADU or SDU is right for their property and their needs. Our sister company, Filament Construction has built many SDUs and covers the end-to-end process from planning to completion. For more information visit


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