ADU Construction
Licensed ADU contractor · Snohomish County and North King County
We build accessory dwelling units across Snohomish County and North King County — design-build with permits handling so you are not navigating city and county process alone.
Licensed. Bonded. Insured.
Your home is in safe hands.
Washington State L&I verified for your protection.
7 Years Experience
Serving Snohomish and North King County since 2019.
Backyard cottages with permits handling
ADU construction is design-build from feasibility through handoff — detached and attached accessory dwelling units as scope and jurisdiction allow. We walk through setbacks, utility tie-ins, and design review requirements honestly before ground breaks.
Permits handling covers application support and plan review coordination — not guaranteed approval timelines or rental income. Part of our ADU construction services across Snohomish County and North King County.
Permits handling and clear design-build scope — before ground breaks on your lot.
ADU stem wall foundation — Snohomish County
Project Types
ADU Projects We Handle
From detached backyard cottages to garage conversions and in-law units — scoped clearly for homeowners adding living space in permit-ready jurisdictions across Snohomish County, North King County, and Seattle.
Detached ADUs (DADU)
Backyard cottages with foundation, framing, MEP rough-in, and exterior shell — utility tie-ins and fire separation documented in scope.
Attached ADUs
In-law units and attached accessory dwellings where lot layout and separation requirements allow — feasibility confirmed before design work.
Garage & Basement ADUs
Conversions of existing garage or basement space where jurisdiction rules and egress allow — structural and moisture conditions assessed honestly upfront.
Interior Finish & Millwork
Drywall, flooring, trim, kitchen, bath, and custom millwork inside the ADU — same finish standards as our remodel wing.
Recent Work
ADU Construction Portfolio
Accessory dwelling unit projects across Snohomish County, North King County, and Seattle.
Our Process
How an ADU Project Runs
Three clear phases from feasibility to handoff — with permits handling and scope agreed before construction begins.
Feasibility & Permits
We review your lot, setbacks, utility access, and jurisdiction requirements. Permits handling covers application support and plan review coordination.
Construction
Foundation, framing, MEP rough-in, and exterior shell run with inspectable milestones. Interior finish follows the same standards as our remodel wing.
Finish & Handoff
Interior doors, trim, fixtures, paint, and punch-list walkthrough. The ADU is ready for occupancy at handoff.
Design-build ADU construction with permits handling — scoped clearly before ground breaks.
Why homeowners choose Artbrick
Artbrick LLC is a licensed Washington State contractor based in Granite Falls — bonded, insured, and L&I verified (License ARTBRL*812B8). You work with one team from feasibility through handoff.
- Permits handling included in scope
- Design-build from feasibility to finish
- Interior finish quality matching remodel wing
- Jurisdiction-honest feasibility review
- Licensed contractor for ADU construction
See more completed work on our portfolio or explore all ADU construction services.
What’s included
Typical ADU construction scope — site-specific requirements and jurisdiction fees documented separately in your proposal.
- Feasibility review
- Permits handling support
- Foundation and framing
- MEP rough-in coordination
- Exterior shell
- Interior drywall and finish
- Kitchen and bath finish as scoped
- Punch-list walkthrough
Related remodel services
Where We Work
ADU Construction Service Area
Based in Granite Falls and serving homeowners across Snohomish County and North King County for ADU construction in permit-ready jurisdictions.
Snohomish County
Everett · Lynnwood · Edmonds · Mill Creek · Granite Falls · Lake Stevens · Marysville · Mukilteo · Bothell
North King County
Shoreline · Kirkland · Redmond · Woodinville · Kenmore · Bothell · Seattle (north)
ADU feasibility depends on your lot and local codes. Contact us with your address and we will confirm whether your project is a fit.
ADU construction in local cities
We build ADUs in Seattle (including the MLK corridor and surrounding neighborhoods), Everett, Granite Falls, Mill Creek, Lynnwood, Edmonds, Shoreline, Kirkland, and surrounding communities where jurisdiction rules allow. Feasibility is confirmed before design work begins.
ADU Construction Questions
Frequently Asked Questions
Service-specific questions about ADU types, construction scope, timelines, and getting a quote.
What types of ADUs do you build?
We build detached backyard cottages (DADUs), attached in-law units, and garage or basement conversions where jurisdiction rules and lot layout allow. Feasibility is confirmed before design work — not every lot fits every ADU type.
What is included in a typical ADU construction scope?
Typical scope covers feasibility review, permits handling support, foundation, framing, MEP rough-in coordination, exterior shell, and interior finish as documented in your proposal. Jurisdiction fees and site-specific engineering are listed separately.
Do you build the foundation and exterior shell?
Yes. Foundation, framing, and exterior shell run with inspectable milestones before interior finish begins. Drainage, utility tie-ins, and fire separation requirements are documented in scope for your lot.
Can you finish the interior kitchen and bathroom?
Yes. Drywall, flooring, trim, kitchen, and bath finish are part of our design-build scope when included in your proposal — same finish standards as our remodel wing.
How long does ADU construction take after permits?
Construction duration depends on size, foundation type, weather, and inspection schedules. We communicate milestones as work progresses; we do not publish fixed timelines because every lot and jurisdiction differs.
Do you work from architect plans I already have?
Yes. If you already have plans from an architect or designer, we can review them for buildability and handle permits coordination as a separate conversation. Design-build from scratch is also available where we are the builder of record.
What happens during the feasibility review?
We review your parcel map, setbacks, utility access, existing structures, and local ADU ordinance. You receive an honest assessment of what is likely feasible before design work or permit applications begin.
How do I get an ADU construction quote?
Use our contact form or call (425) 422-5947. Share your address, ADU goals, and any existing plans — we follow up after feasibility review with a written proposal.
A backyard ADU starts with an honest feasibility review — not a sales pitch.
Get Started
Tell us about your ADU project
Share your address, ADU goals, and rough timeline. We will follow up to discuss feasibility and permits.