ADU and DADU Construction in Seattle and the Eastside
Emerald City Construction & Renovation is a Greater Seattle-based contractor specializing in the design and construction of accessory dwelling units (ADUs) and detached accessory dwelling units (DADUs). Serving homeowners across Seattle, Bellevue, Kirkland, Redmond, Sammamish, Issaquah, and surrounding communities, they work with clients looking to add functional, well-designed living space to their properties.
A DADU, or detached accessory dwelling unit — sometimes called a backyard cottage — is a separate structure built on the same lot as the primary home. These units are a practical option for homeowners who want to add usable space without altering their existing home. An ADU, by contrast, is connected to or located within the existing structure. Common forms include basement ADUs, attached suites, and garage conversions. Both types offer flexible options for multigenerational living, rental income, or accommodating long-term guests.
Emerald City Construction & Renovation guides homeowners through each phase of the process — from initial planning and permitting through construction and completion. Most projects in the Seattle and Eastside area take between 8 and 14 months from the first planning conversations to move-in, depending on site conditions, permitting timelines, and the level of customization involved. Typical project costs start around $350,000 to $500,000+, with higher-end builds involving custom finishes or complex site requirements often exceeding that range.
Common Features in Seattle-Area ADU and DADU Projects
Homeowners across the region tend to prioritize features that make smaller spaces feel functional and livable. Some of the more commonly requested elements include:
- Open-concept layouts with flexible living zones and built-in storage to make the most of limited square footage
- Sustainable and durable finishes such as bamboo flooring, recycled-surface countertops, and locally sourced wood
- Space-efficient bathrooms with walk-in showers, floating vanities, and heated floors for cooler months
- Energy-saving appliances including compact laundry units, induction cooktops, and high-efficiency mini-split systems
- Compact or full kitchenettes with slim appliances, clever storage, and quality countertop materials
- Private entrances to provide independence for occupants — particularly relevant for rental units or multigenerational households
- Natural light features such as large windows, skylights, and glass doors to brighten interiors during Seattle's darker months
- Dedicated outdoor areas including patios, decks, or fenced courtyards to extend the usable living space
- Soundproofing and enhanced insulation for privacy between the main home and the ADU or DADU
- Smart home integration including thermostats, automated lighting, and app-based security systems
- Solar panels or green roofing for homeowners focused on long-term energy efficiency
- Flexible, multi-use rooms that can serve as a guest suite, home office, or short-term rental space
Architectural style is also a consideration. Emerald City Construction & Renovation works to ensure that ADU and DADU designs feel cohesive with the existing home and its surroundings, whether that means a modern aesthetic, Craftsman detailing, or mid-century inspired elements.
Is an ADU or DADU the Right Fit?
For homeowners with underused attached or detached space, an ADU or DADU can be a practical way to add value and function to a property. These units are commonly used for:
- Housing aging parents or adult children
- Generating long-term or short-term rental income
- Creating a dedicated home office or studio
- Providing a private guest suite
- Future-proofing a property for changing household needs
Emerald City Construction & Renovation serves homeowners in Seattle, Bellevue, Mercer Island, Newcastle, Kirkland, Renton, Hobart, Redmond, Sammamish, Issaquah, Woodinville, Factoria, and Maple Valley. Their team works as an ADU contractor and DADU builder focused on delivering thoughtful design and quality construction throughout the Greater Seattle area.
