Cascadia ADU

Cascadia ADU is a Washington-based accessory dwelling unit (ADU) design and construction company specializing in ADU planning, design, permitting, conversions, and turnkey construction services. As a division of Cascadia Design & Build LLC, the company provides homeowners with a streamlined, one-stop solution for creating high-quality attached and detached ADUs throughout King, Snohomish, Skagit, and Chelan Counties. With more than a decade of experience, Cascadia ADU has built a reputation for delivering efficient project timelines, expert craftsmanship, and personalized service.

The company’s in-house design, permitting, construction, and electrical teams work together to simplify the ADU development process from concept to completion. By keeping critical services under one roof, Cascadia ADU helps homeowners reduce delays, improve communication, and create functional living spaces that enhance property value and lifestyle flexibility.

ADU Design & Construction Services

Services Include:

• Attached ADU construction
• Detached ADU (DADU) construction
• Garage conversions
• Basement conversions
• New ADU additions
• In-house ADU design services
• ADU permitting and approvals
• ADU planning and consultation
• Electrical installation services
• Custom ADU construction
• A la carte design and construction services
• Project management and construction oversight

The company guides homeowners through every phase of the ADU process, including consultation, design, permitting, construction, and final completion, ensuring projects are completed efficiently and in compliance with local regulations.

Why Homeowners Choose Cascadia ADU

• More than 10 years of ADU experience
• Complete in-house design and permitting services
• Dedicated construction and electrical teams
• Expertise in attached and detached ADUs
• Garage and basement conversion specialists
• Strong focus on quality craftsmanship
• Local permitting and zoning knowledge
• Transparent communication and project management
• Serving multiple counties throughout Washington

Cascadia ADU focuses exclusively on helping homeowners maximize their property’s potential through thoughtfully designed and professionally built accessory dwelling units. The company’s commitment to speed, quality, integrity, transparency, and local expertise helps ensure a smooth and successful building experience.

Building Functional Living Spaces for Washington Homeowners

Whether creating a rental unit, home office, multigenerational living space, guest house, or detached backyard cottage, Cascadia ADU delivers customized solutions designed to meet each homeowner’s unique goals. Through comprehensive planning, expert construction, and dedicated customer service, the company continues to help property owners unlock the full potential of their homes.