Modern home addition exterior built by Luxe Remodeling LLC

Additions & ADUs

Home Additions & ADUs in the Greater Seattle Area

Room additions and accessory dwelling units coordinated from early planning through construction and finish work.

Home/Services/Additions / ADUs

Planning Added Space

Connect the New Space to the Existing Home

A home office, guest suite, primary bedroom, or self-contained ADU has to work on its own and connect logically to the property around it. Rooflines, access, utilities, daylight, privacy, and finish transitions all affect the plan.

Permitting and site requirements vary by city and property. Identifying them early helps establish which type of addition is practical before design and material decisions move too far ahead.

The scope can include design and engineering coordination, permits, construction, utility connections, interior finishes, and final inspections.

Types of Additions We Build

Room additions (bedroom, office, family room)

Primary suite additions

Detached ADUs (backyard cottages)

Attached ADUs (above garage, side addition)

Garage conversions to living space

DADU: Detached Accessory Dwelling Units

Structural engineering coordination

Full permit management

Get a Free Consultation

Tell us about your addition or ADU project and we'll be in touch within one business day.

Planning Details

More Than New Square Footage

One Coordinated Scope

We handle permits, engineering, construction, and inspections, so you don't have to coordinate between multiple contractors and the city.

Connection to the Existing House

Our additions are designed to look and feel like they were always part of your home, matching rooflines, siding, and finishes precisely.

City-Specific Requirements

ADU regulations and site conditions vary by city and property, so permitting requirements need to be reviewed early in the process.

Budget and Priorities

Additions and ADUs are significant investments. We give you realistic cost ranges upfront so you can plan confidently without surprises.

Common Questions

Additions & ADU FAQ

Yes. ADUs require permits in virtually all Washington State cities. We handle the entire permit process for you, including working with the city planning department, coordinating any required engineering, and managing inspections throughout construction.
ADU costs in the Greater Seattle area typically range from $150,000 to $350,000+ depending on size, type (attached vs. detached), finishes, and site conditions. A garage conversion is generally less expensive than a new detached structure. We'll give you a realistic estimate at your free consultation.
From permit application to move-in, an ADU typically takes 6–12 months. The permitting phase can take 2–4 months depending on the city and project complexity. We'll walk you through a realistic timeline at your consultation.
Yes. ADUs can be rented as long-term or short-term rentals (subject to local short-term rental regulations). Many of our clients build ADUs specifically to generate rental income that offsets their mortgage or provides housing for aging parents or adult children.
★★★★★
"We had our ADU built by Luxe and the whole process was smooth from start to finish. They handled the permits, coordinated everything, and built a beautiful little unit that fits perfectly with our home."

Patricia N., Bothell ADU Project

Considering an Addition or ADU in the Greater Seattle Area?

Discuss your plans with an additions and ADU contractor serving Bellevue, Kirkland, Redmond, Sammamish, Issaquah, and nearby communities.

Schedule a Free Consultation