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ADU (Accessory Dwelling Unit) Conversions

Expert Home Transformations by Seattle Conversions

Seattle Conversions specializes in transforming underutilized spaces into high-quality Accessory Dwelling Units (ADUs) that enhance both functionality and property value. Serving homeowners across the Greater Seattle area, we bring years of expertise in designing and constructing ADUs that seamlessly integrate with existing homes while optimizing every square foot. From initial consultation and feasibility assessments to architectural planning, permitting, and final construction, our team handles the entire process with precision and professionalism. We work closely with homeowners to create customized ADUs that meet their unique needs—whether it’s a rental unit for passive income, a private guest suite, a home office, or a multi-generational living space. Seattle Conversions is committed to delivering exceptional craftsmanship and ensuring full compliance with Seattle’s evolving ADU regulations. Our dedicated project management guarantees smooth execution, and every conversion is backed by a comprehensive workmanship warranty for long-term peace of mind.

Understanding ADUs and Seattle Conversions' Approach

Seattle Conversions specializes in transforming existing spaces into legal accessory dwelling units through detailed planning, expert guidance, and efficient execution. 


What Is an ADU?


An Accessory Dwelling Unit (ADU) is a secondary living space on a single-family property. These units can be attached to the main house, built as a separate structure, or converted from existing spaces like garages or basements.


ADUs range from 200 to 1,000 square feet, depending on local regulations. They must include basic living amenities such as a kitchen, bathroom, and sleeping area.


Common ADU types include:


  • Detached backyard cottages
  • Garage conversions
  • Basement apartments
  • Attached additions

The Conversion Process with Seattle Conversions


Seattle Conversions begins each project with a thorough site assessment and consultation. Their architects evaluate the existing structure and discuss the client's vision for the space.

The company handles all aspects of the conversion:


  • Initial Design: Creating blueprints that maximize space efficiency
  • Permit Application: Managing paperwork and regulatory requirements
  • Construction: Implementing modern building techniques and materials
  • Final Inspection: Ensuring all work meets code requirements

Regulatory Landscape for ADUs


Seattle's zoning laws permit both attached and detached ADUs on single-family lots. Property owners must meet specific requirements:


Size Restrictions:


  • Maximum 1,000 square feet
  • Cannot exceed 40% of the main dwelling's footprint


Building Code Requirements:


  • Minimum ceiling height of 7 feet
  • Adequate emergency exits
  • Independent heating system
  • Proper insulation and ventilation


A valid building permit is required before construction begins. Seattle Conversions maintains current knowledge of local regulations and handles all permit applications.

Financial and Sustainability Considerations

Economic Advantages of ADUs

The typical ADU conversion by Seattle Conversions costs between $80,000 to $150,000, varying based on scope and specifications. Property owners can expect to recover this investment through multiple revenue streams.


Monthly rental income from ADUs in Seattle ranges from $1,200 to $2,500, depending on size and location. This additional income stream helps offset mortgage payments and provides steady returns.


Properties with ADUs typically see a 20-30% increase in value. A $500,000 home could gain $100,000-$150,000 in market value after adding a well-designed ADU.

Green Living with ADUs

Seattle Conversions incorporates energy-efficient features that reduce utility costs by 30-40% compared to traditional structures. LED lighting and smart thermostats come standard in every ADU project.


Modern insulation materials and double-pane windows minimize heat loss while maintaining comfortable indoor temperatures year-round.


Solar-ready electrical systems allow for future panel installation, supporting sustainable energy goals. Water-efficient fixtures reduce consumption by up to 20% compared to standard options.


Built-in recycling stations and composting areas promote waste reduction. Native plant landscaping requires minimal water and maintenance while supporting local ecosystems.

Step 3: Floor and Ceiling Integration

Existing flooring is matched or replaced to create a seamless transition between the former dining room and living areas. Any gaps from removed walls are expertly filled. The ceiling is refinished to eliminate visible seams where walls once stood. Lighting fixtures are repositioned to provide even illumination throughout the combined space.

Step 4: Final Touches and Design Elements

Fresh paint unifies the newly combined areas. Strategic furniture placement creates distinct zones while maintaining an open flow.

Built-in storage solutions and transitional design elements help define spaces without physical barriers. The result is a harmonious blend of dining and living areas that enhances both functionality and home value.

Flexible Financing Options for Your ADU Conversion

At Seattle Conversions, we understand that financing an ADU project is a big decision. That’s why we offer a range of financing options designed to fit different budgets and financial situations, making your ADU conversion more accessible and stress-free.


We partner with trusted lenders to provide secure, transparent, and competitive financing solutions. Whether you’re interested in traditional loans, home equity options, or specialized ADU financing programs, our financial advisors will guide you through the best options available.


Our streamlined application process ensures quick approvals and minimal paperwork, so you can focus on bringing your vision to life. With flexible repayment terms and competitive interest rates, we make it easier to turn your unused space into a valuable living area.

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