The Essentials To Know Before Building A DADU In Seattle

The Essentials To Know Before Building A DADU In Seattle

In a competitive real estate market like Seattle, finding ways to secure a solid financial future is crucial. One lucrative investment opportunity that has been gaining traction is the addition of ADUs (Additional Dwelling Units) to residential properties. As the cost of homeownership rises and the demand for affordable housing increases, ADUs offer homeowners a unique chance to diversify their income streams and create long-term financial stability. Emerald City Construction in Seattle can help homeowners unlock the potential of ADUs and reap the benefits of this smart investment choice. Learn more about the investment opportunities of additional dwelling units, and contact us for a free quote today.



A DADU, also known as a Detached Accessory Dwelling Unit, is a secondary housing unit that is built on the same property as a primary residence. This can be a great option for homeowners who want to increase their property's value and create additional living space on their property. An ADU is a similar structure, only it remains attached to the primary residence.

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Uses of DADUs

Some common uses of DADUs include:

  • Rental Income: With Seattle's high cost of living, many homeowners are turning to DADUs as a way to generate additional income. By renting out the DADU, homeowners can supplement their mortgage payments and potentially even make a profit.

  • Multi-Generational Living: DADUs are also a popular option for families who want to provide a separate living space for aging parents or adult children. This allows for a sense of independence while still being close to loved ones.

  • Home Office or Studio: With the rise of remote work and creative professions, many homeowners are using DADUs as a dedicated space for their work or hobbies. This allows for separation between work and home life and can increase productivity.

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Seattle Requirements for Building DADUs

In Seattle, there are specific requirements that must be met in order to build a DADU. The maximum size allowed is 1,000 square feet, and it must be no more than two stories tall. Additionally, the DADU must have its own entrance, kitchen, and bathroom, and it cannot be sold separately from the main house.

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How Zoning Laws and Regulations Can Affect DADU Construction

Depending on the specific zoning of your property, there may be restrictions on the size or location of the unit. It's crucial to research and understand these laws before beginning the building process. Our team at Emerald City Construction is well-versed in Seattle zoning laws and can help guide you through the process.

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Costs of DADUs

Building a DADU can be a significant investment, and it is essential to have a realistic budget in place before starting the project. Along with the cost of construction, you will also need to factor in the cost of permits, design and architectural fees, and any additional expenses such as landscaping or upgrades. It is also crucial to consider the potential return on investment and how the DADU will impact the value of your property.

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Practical Tips for DADU Construction with No Setbacks

There are a few practical tips to keep in mind during the construction process to avoid any setbacks. Ensure that you have all the necessary permits in place before beginning any work. Failure to obtain the required permits can lead to costly fines and delays. Regularly communicate with your contractor to stay updated on the progress and address any concerns promptly. Lastly, make sure to have a detailed contract in place that outlines the scope of work, timeline, and payment schedule. This will help avoid any misunderstandings or disputes during the construction process.


Emerald City Construction is here to help navigate you through the requirements, regulations, and potential costs and benefits of building a DADU in Seattle. Contact us today to get started on your DADU project!

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