Is an ADU right for you?

Accessory Dwelling Units, or ADU’s, are a popular solution to the affordable housing crisis in many cities. ADU’s can provide affordable housing options, generate rental income, and add value to your property. Designing an ADU is a complex process that requires careful consideration of a range of factors. In this article, we will explore some of the key considerations that should be taken into account when designing an ADU.

Zoning Regulations

Before designing an ADU, it is important to check the local zoning regulations. Zoning regulations vary widely depending on the location, so it is important to know the specific requirements in your area. Some areas may require a certain setback from the property line, while others may require a minimum lot size or prohibit certain types of structures. It is essential to ensure that your ADU complies with all applicable regulations to avoid any legal issues. As part of our land use planning service line, we have the expertise to research and synthesize the complexities of your property’s zoning in an easy to understand format.               

Size and Layout

The size and layout of your ADU will depend on your specific needs and the available space on your property. Generally, ADUs range in size from 300 to 800 square feet. You should consider the size and layout of your ADU carefully to ensure that it is functional and comfortable. When designing the layout, it is important to consider factors such as privacy, accessibility, and natural light. Designing any project, including ADU’s is a matter of establishing values and goals for the end product. Part of our mission is to help our clients isolate which values are most important and balance those with local code requirements. 

Utilities

Another important consideration when designing an ADU is the utilities. You will need to ensure that the ADU has access to electricity, water, and sewer services. In some cases, you may need to upgrade the existing utilities on your property to accommodate the ADU. You should also consider how the ADU will be heated and cooled, as this will have an impact on energy costs. In our property research and design, we can assist in evaluating the best path for the ADU’s utilities. In addition, we recommend connecting with a general contractor early on in the process to evaluate the building and site utility options. 

Building Codes

When designing an ADU, it is important to ensure that it meets all applicable building codes. This includes fire safety codes, electrical codes, and plumbing codes. You should work with a professional like Full Stop Design Studio, who has experience designing and building ADUs to ensure that your ADU meets all applicable codes. Navigating the building code requirements can be a confusing process, but we are here to help. 

System Development Charges

In addition to complying with building codes, you should also consider system development charges (SDCs). SDCs are fees charged by cities and counties to help fund public infrastructure projects. SDCs can be significant and can vary widely depending on the location. You should factor SDCs into your budget when designing an ADU. SDC’s for ADUs can total between $20,000 and $30,000 - luckily the city allows a waiver for ADU SDC’s provided that the property is not used for short term rentals for a period of 10 years. If you are weighing your options to decide whether to pursue an ADU, we can assist in summarizing the variables at play so that you can make the best decision for your property, your budget, and your long-term goals. 

Cost

Finally, you should consider the cost of building an ADU. The cost of an ADU can vary widely depending on factors such as the size, materials, and location. It is important to establish a budget for your ADU and to work with a professional architect and builder to ensure that your design fits within your budget.

In conclusion, designing an ADU requires careful consideration of a range of factors. By taking into account the zoning regulations, size and layout, utilities, building codes, SDCs, and cost, you can ensure that your ADU is functional, comfortable, and compliant with all applicable regulations. With careful planning and the help of a professional like Full Stop Design Studio, you can design an ADU that adds value to your property and provides a valuable affordable housing option.


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Buying a House in Portland? Be Aware of Code Violations.