A well-designed accessory dwelling unit is a second home, a rental, an in-law suite, or all three, depending on the season. Pacific Blue Design & Build provides ADU construction across King County, Pierce County, and Kitsap County, with a design-build approach that handles site planning, permitting, and construction under one clear process.
An accessory dwelling unit is one of the most personal projects a homeowner takes on. It might house a parent, a college-aged child, a long-term tenant, or a future version of yourself. The design needs to anticipate years of use, not just the first one. Pacific Blue Design & Build approaches every ADU construction project in Seattle with that long arc in mind, planning for accessibility, privacy, sound, and storage from the first sketch.
This is not a packaged backyard cottage. It is a design-build approach for homeowners across the Puget Sound who want a true second residence on their property. Whether you are building a detached ADU in the backyard, a garage conversion, or an attached basement unit, our goal is the same: a small home that lives well, meets current Seattle DADU code, and adds lasting value to the property.
ADU Construction Services
Every property has different ADU possibilities depending on lot size, setbacks, existing structures, and zoning. Pacific Blue Design & Build reviews each site individually and designs an ADU that fits the property rather than forcing the property to fit a plan.
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A freestanding small home in the backyard, designed and permitted under the current Seattle DADU code. We handle everything from site planning and foundation through interior finishes, with attention to privacy lines, neighbor sightlines, and the way the unit reads from the main house.
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A secondary suite added to the existing home, often through a basement conversion, an above-garage build, or a side addition. Attached ADUs share a wall with the main residence but function as fully independent units with their own entry, kitchen, and utilities.
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A two-car garage often holds the bones of a beautiful small home. We convert garages into ADUs with proper insulation, foundation work, plumbing, and the kind of natural light that makes the unit feel intentional rather than retrofitted.
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For families planning to share a property across generations, we design ADUs with accessibility, single-level living, and visual connection to the main home in mind. These are spaces built to support aging parents or returning adult children with dignity and privacy.
OUR 3D DESIGN-BUILD PROCESS
Remodeling decisions get expensive fast when you can't visualize the outcome. Our 3D design-build process removes the guesswork: every wall, finish, fixture, and sightline is modeled before construction begins. You'll walk through your remodel in photorealistic detail, make confident choices early, and avoid the costly change orders that derail most projects.
Pacific Northwest Design-Build
Pacific Blue Design & Build was created for homeowners who want more than a basic remodel. The process should feel organized. Communication should feel clear. The design should feel connected to the home and the way people live throughout the Pacific Northwest. We serve homeowners across King County, Pierce County, and Kitsap County with a thoughtful, design-focused approach that values functionality, timeless materials, natural flow, and careful planning.
Complementary Services
An ADU project often touches the main home and the outdoor space around it. Explore the services that most often pair with ADU construction.
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When the ADU plan is best handled as an attached unit, a thoughtful addition can deliver the same square footage with a different feel.
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A finished basement can serve as the foundation for an attached ADU, with proper egress, ventilation, and code compliance built in from the start.
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A detached ADU benefits from a clear, well-designed path, patio, and outdoor zone that ties it to the main home and the property as a whole.
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A small deck or terrace gives an ADU its own outdoor moment, which makes the unit feel like a true home rather than a guest room.
Explore Service"I built this practice around the way I'd want a contractor to treat my own home — fewer clients, more oversight, and decisions made in writing before work begins. That's the standard on every Shiro commission."— Shir Gal Founder & Principal
Our Remodeling Process
Remodeling should not feel like guesswork. Our process is built to help Seattle homeowners move from early ideas to a more defined plan with fewer surprises and better decisions along the way.
Every project starts with a conversation in your home. We listen closely, take careful measurements, and learn what matters most, from the way you use each space to the realities of your budget.
Our in-house architect shapes your vision into a tailored design, paired with curated material samples, photorealistic walkthroughs, and a clear, itemized estimate so nothing is left to guesswork.
A dedicated project manager leads construction from start to finish, with weekly on-site walkthroughs and a private client portal that keeps you informed at every stage.
We finish the way we started, with care. Your home is professionally cleaned, every system tested and commissioned, and a complete maintenance binder handed over alongside photos documenting the journey from day one.
If you are exploring an ADU for rental income, family use, or long-term flexibility, start with a team that takes design, code, and craft seriously. Pacific Blue Design & Build helps homeowners across King, Pierce, and Kitsap counties plan, permit, and build accessory dwelling units that hold their value.
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Frequently Asked Questions
We've gathered the most common questions homeowners ask us, so you can plan your remodel with clarity and confidence.
An ADU is any accessory dwelling unit, including ones attached to the main home. A DADU is a detached accessory dwelling unit, meaning a standalone structure on the same lot. Seattle allows both, with different rules around size, height, setbacks, and parking depending on the property.
Most single-family lots in Seattle, King County, Pierce County, and Kitsap County allow some form of ADU. The specifics depend on lot size, zoning, setbacks, and existing structures. We review your property and the current code during the design phase to confirm what is possible.
A detached ADU typically takes 8 to 14 months from initial design through final inspection, including permitting. An attached ADU or garage conversion often runs shorter, depending on how much of the existing structure is reused. We provide a written timeline once the scope is defined.
Yes. We handle full permitting through Seattle DCI, King County, Pierce County, or Kitsap County, including land use review, structural review, and Washington State Energy Code compliance. You sign nothing at the city counter.
DADUs in Seattle are generally capped at 1,000 square feet of conditioned space, with some flexibility depending on zoning and lot conditions. Attached ADUs often run between 500 and 1,000 square feet. We design to fit the way you intend to use the unit, not just to the maximum size.
