Seattle and Eastside ADUs
ADUs in Seattle and the Eastside, planned around the lot, the rules, and the people who will use them
Accessory dwelling units require careful coordination of zoning, access, utilities, privacy, parking, structure, and compact-space design. RT Signature Homes brings feasibility, permitting, and construction into one process.
Call (206) 407-6291An ADU is a second home on a lot you already own. Those constraints belong to the property. They do not belong to a Pinterest board. We take qualifying ADU work from Redmond when the lot, the household, and the delivery path actually support it.
Project fit
The service covers detached and attached ADUs, qualifying garage conversions, and compact living spaces intended for family, guests, work, or rental use.
Typical scope
- Site, setback, access, and feasibility review
- Attached, detached, and conversion design
- Utility, drainage, energy, and structural coordination
- Permitting and jurisdiction-specific documentation
- Compact kitchens, bathrooms, storage, daylight, and privacy
- Construction sequencing on occupied Seattle and Eastside lots
Design ideas
ADU design and construction inspiration
Explore visual directions alongside the planning, material, and performance decisions that help turn an idea into a buildable project.
ADU design ideas
A successful ADU makes limited area feel deliberate. These ideas explore compact planning, daylight, privacy, storage, utilities, access, and a respectful relationship to the primary home.
Explore the galleryMake every circulation and storage decision earn its place.
ADU interiors need practical relationships between cooking, bathing, sleeping, storage, utilities, and natural light.
The design should feel deliberate rather than reduced. How the unit will be used (family, rental, office, guest) changes layout, parking, and sometimes review. We ask that before anyone draws a studio over the garage.
Design around access, setbacks, utilities, and existing landscape.
The best location on paper may conflict with trees, drainage, utility routes, privacy, or construction access.
A site assessment helps identify those constraints before they become redesign work. Seattle, Redmond, and Bellevue implement ADU rules locally. Size, height, setbacks, parking, and whether detached, attached, or conversion is even on the table are property-specific. We confirm current standards with the city that has jurisdiction. We do not replace those rules with a blog post.
For the broader planning questions, see ADU feasibility in Washington. For how Redmond publishes building-permit fees, see What remodel permits can cost in Redmond. Redmond's tables are not a statewide rulebook.
How the work moves
A process that keeps decisions ahead of construction.
Discovery and site assessment
We clarify goals, review existing conditions, identify constraints, and determine what needs deeper investigation before a scope is written. For an ADU that starts with the lot, access, utilities, and intended use.
Design and pre-construction
Layout, materials, trade requirements, permits, allowances, schedule factors, and decision deadlines are coordinated into one buildable plan.
Construction and completion
The work is sequenced, protected, inspected, communicated, and closed out with a final walkthrough and documented completion items.
Budget and schedule orientation
Scope the variables before suggesting a number.
Useful early guidance identifies what changes the investment and timeline. A responsible project range follows an assessment of the property, scope, finish expectations, and delivery constraints.
Common factors
- Zoning, setbacks, lot coverage, parking, and access
- Utilities, drainage, and whether upgrades are in play
- Attached, detached, or conversion structure
- Permit, engineering, and design requirements for the applicable city
- Site access, protection, weather, and construction logistics next to an occupied home
Questions homeowners ask
ADU design and construction FAQs
What is the first step for an ADU?
Confirm the property, jurisdiction, access, utilities, setbacks, and intended use before investing in a detailed design.
Can an existing garage become an ADU?
Sometimes. Foundation, ceiling height, structure, moisture, insulation, egress, utilities, parking rules, and code compliance must be evaluated.
Do attached and detached ADUs follow the same process?
They share many decisions, but structure, fire separation, utilities, privacy, access, and site work can differ substantially.
Can every Seattle or Eastside lot take an ADU?
No. Feasibility is property-specific.
Will you give me a turnkey ADU price on the first call?
No. Utilities, access, and city rules have to be investigated.
Continue exploring
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Start a practical conversation
Find out what the property can support.
Share the address, intended use, and what you already know about the lot or existing structure.