ADU Builders in Bellevue, WA

Licensed ADU Contractors Specializing in Custom Backyard Cottages, Garage Conversions & In-Law Suites

Unlock the full potential of your property with a custom-built accessory dwelling unit (ADU). As experienced ADU contractors in Bellevue, BelRed Construction designs and builds detached cottages, garage conversions, and in-law suites that meet your needs and exceed expectations.

What Is an ADU—and Why Build One?

An ADU, or accessory dwelling unit, is a fully livable secondary home on your existing property. It’s a smart solution for families needing multigenerational housing, homeowners looking to earn rental income, or anyone seeking flexible space that adds long-term property value.

Updated ADU Laws in Bellevue & King County (HB 1337)

Thanks to Washington’s new HB 1337 law, building an ADU in Bellevue and nearby cities has never been easier. Homeowners can now:

• Build up to two ADUs per lot
• Skip on-site owner occupancy requirements
• Benefit from reduced parking and setback regulations

BelRed Construction stays up to date with all zoning codes and permitting requirements to ensure your project is fast, smooth, and fully compliant.

Types of ADUs We Build

• Detached ADUs (DADUs) – Backyard cottages or tiny homes
• Garage Conversions – Above or inside existing garages
• Basement Apartments – Separate entrances and finished interiors
• In-Law Suites – Ideal for aging parents or extended family
• Rental Units – Fully independent living spaces for tenants

Why Choose BelRed Construction as Your ADU Contractor?

• Licensed & Insured General Contractor – Over a decade of experience in full-service residential builds
• Design-Build Approach – From feasibility study to final inspection, we manage the entire process
• 3D Design & Custom Layouts – Plans optimized for light, privacy, and comfort
• Expert Permitting & Local Knowledge – We work with Bellevue’s unique regulations, zoning, and inspections
• Energy-Efficient & Smart Options – Sustainable materials and modern upgrades available

What to Expect: ADU Construction Timeline

Every ADU is unique, but our typical timeline includes:

• 1–2 weeks: Initial consultation, site review, and design proposal
• 2–4 weeks: Permitting and plan approvals
• 3–5 months: Full construction including utilities, foundation, and finishes

Request a Free ADU Consultation

If you’re considering an ADU on your property, don’t settle for prefab or cookie-cutter solutions. Our Bellevue-based team of experienced ADU builders and contractors will bring your vision to life — with precision, care, and expert guidance from start to finish.