Custom Accessory Dwelling Unit Construction in Pierce & King County
From concept through completion, we deliver custom Accessory Dwelling Units (ADUs) built on careful planning and skilled execution, emphasizing seamless integration with your existing home, well-coordinated trades, durable high-quality materials, and precise construction. With a structured process and attention to detail at every stage, we create ADUs that enhance your property’s function and style while providing a smooth, well-managed construction experience, whether your project is a detached ADU (DADU), an attached ADU, or a backyard cottage, designed to deliver lasting quality and retain value for years to come. Serving homeowners and design professionals in Tacoma, Kent, Puyallup, Auburn, Lakewood, Renton, Bonney Lake, Covington, Federal Way, and neighboring areas throughout Pierce and King County.
ADU Construction Designed for Performance & Long-Term Value
A well-executed Accessory Dwelling Unit (ADU) must function as a fully independent living space while maintaining architectural consistency with the existing property. Our ADU construction process emphasizes layout efficiency, utility coordination, privacy, and compliance with local zoning and building requirements.
Whether developed for multigenerational living, private guest accommodations, or long-term rental use, each custom ADU is constructed with durable materials, coordinated trades, and a structured process that supports long-term performance and sustained property value.
What You Can Expect:
- Licensed and insured ADU builder serving Pierce and King County
- Clearly defined scope and structured pre-construction planning
- Code-compliant Accessory Dwelling Unit construction
- Coordinated trade management and disciplined execution
- 10-year workmanship guarantee
Our Accessory Dwelling Unit Services
Our ADU services are designed for homeowners and architects seeking professional, reliable construction and a fully managed process for every type of accessory dwelling unit. Each project is carefully planned to maximize functionality, privacy, and long-term value, while maintaining seamless integration with the existing home.
Detached ADUs (DADUs) & Backyard Cottages
Standalone units built with independent utilities, efficient layouts, and exterior detailing that complements the main residence. Each DADU is designed to maximize privacy, natural light, and living space, making it ideal for rental income, guest housing, or multigenerational living.
Attached ADUs
Integrated additions constructed for structural continuity while maintaining functional independence and privacy. These units are planned to align with the style and flow of the main home, ensuring seamless visual and functional integration while providing a self-contained living space.
Interior ADU Conversions
Transform basements, garages, or other interior spaces into fully habitable ADUs that meet code requirements for egress, insulation, and mechanical systems. Our focus is on maximizing livable space while preserving the home’s character and creating a functional, comfortable independent unit.
Plumbing, electrical, HVAC, and mechanical systems are designed specifically for ADUs to ensure independent operation, energy efficiency, and long-term reliability. All installations are coordinated to comply with local code requirements and maintain optimal performance for daily use.
ADU Interior & Exterior Design
Finishes, materials, and layouts are selected for durability, functionality, and aesthetic cohesion with the main home. From flooring and cabinetry to siding and lighting, every detail is planned to create a high-quality, long-lasting ADU that enhances both livability and property value.
Quality Features Included in ADUs
FOUNDATION & FRAMING
Engineered foundations and framing built to safely support small-scale, independent living units, designed for lasting stability.
PLUMBING & ELECTRICAL
Water, sewer, and electrical systems installed or extended to provide fully functional kitchens and bathrooms.
HEATING & VENTILATION
Heating, cooling, and airflow systems tailored to the compact space for consistent comfort and efficiency.
KITCHEN & BATH INSTALLATION
Efficiently designed kitchens and bathrooms with durable finishes, optimized for independent living.
WINDOWS & SAFETY OPENINGS
Code-compliant windows and egress points for safety, ventilation, and natural light, carefully placed for privacy and easy access.
EXTERIOR FINISHES
Siding, roofing, and trim carefully selected to blend with the existing home and protect against the elements.
Why Choose Kirks Renovations for Your ADU Project
Home additions require more than expanded square footage. They demand structural understanding, disciplined coordination, and execution that respects both the existing architecture and the long-term performance of the home.
At Kirks Renovations, we approach each project with a controlled process, technical precision, and clearly defined standards that support durability, architectural continuity, and long-term value. Whether the project is a substantial expansion or a thoughtfully scaled addition, our principles remain consistent:
- Structured Pre-Construction Planning: Project scope, specifications, and sequencing are clearly documented before construction begins, supporting accurate scheduling, trade coordination, and a smooth construction experience.
- Local Code & Zoning Compliance: We manage permits, inspections, and compliance requirements throughout Pierce and King County to ensure every ADU meets local regulations.
- Architectural & Structural Integration: Each ADU is built to complement the existing property while maintaining independent functionality. Exterior transitions, layouts, and finishes are carefully coordinated for cohesion and livability.
- Durable Construction Standards: From foundation to finishes, materials and methods are selected for daily use, longevity, and structural integrity. Our ADUs are constructed to perform reliably for years.
- 10-Year Workmanship Guarantee: All work is backed by a 10-year guarantee, reflecting our confidence in the quality, durability, and lasting value of every Accessory Dwelling Unit we build.
Kara & Eero Kitchen Remodel
A 1960s galley kitchen was transformed into a more open and inviting space. Strategic layout changes, refined cabinetry, and durable finishes created a kitchen that feels connected, functional, and comfortable for everyday living.
Eli Yarnold Bathroom Remodel
A once-dated master bathroom was reimagined into a calm, purposeful space. Guided design decisions and careful execution transformed the shower into a functional anchor, supported by clean materials and detailing.
Custom Homes • Custom Process • Lasting Value
A Refined Design-Build Experience
Every home and vision is unique. Our team approaches each project with a personalized process shaped by thoughtful design, careful planning, and skilled construction, delivering spaces defined by quality and built to last.
Begin With your Vision
Understand your goals, priorities, and expectations before evaluating the home and its possibilities.
Understand the Space
Assess the existing structure, layout, and conditions to determine the best path forward.
Integrate the Plan
Align design, material, scope, and budget into a clear, well-defined renovation plan.
Lead the Construction
Manage the renovation with consistency, communication, and attention to detail throughout the build.
Deliver Lasting Results
Complete a refined renovation built for quality, performance, and long-term value.
Let's Talk About Your Project
Start your home transformation today with a team focused on quality, clarity and lasting results. We’ll work with you to plan, execute, and deliver a project that meets your goals and stands the test of time.
Areas We Serve
We serve these communities to make remodeling and repairs easier and more reliable for local homeowners, backed by experience and a focus on long‑lasting results:
- Auburn
- Black Diamond
- Bonney Lake
- Burien
- Covington
- Des Moines
- Edgewood
- Fairwood
- Federal Way
- Fircrest
- Gig Harbor
- Graham
- Lake Tapps
- Lakewood
- Maple Valley
- Milton
- Orting
- Puyallup
- Spanaway
- Steilacoom
- Sumner
- Tacoma
- University Place
Accessory Dwelling Unit (ADU) FAQs
Frequently Asked Questions About Custom ADUs
What is an Accessory Dwelling Unit (ADU)?
An ADU is a self-contained residential unit located on the same property as a primary home. It includes a kitchen, bathroom, and sleeping area designed for independent living.
Do ADUs require permits in Pierce and King County?
Yes. ADU construction requires zoning review, building permits, and inspections. We manage the permitting and inspection process to ensure compliance with local regulations.
What factors influence the scope of an ADU project?
Site conditions, utility access, foundation requirements, parking regulations, design complexity, and material selections all influence scope and investment level.
How long does ADU construction take?
Timelines vary depending on design, permitting review, and construction complexity. Projects are completed in clearly defined phases to maintain transparency and coordination.
Do you collaborate with architects on ADU projects?
Yes. We execute architect-led ADU projects, coordinating closely to ensure structural accuracy, specification alignment, and precise execution.
Ready to Enhance Your Property with a Custom ADU?
Partner with Kirks Renovations for a structured, expertly managed ADU construction process from feasibility and permitting through final inspection. We handle every detail with precision, coordinated trades, and disciplined execution, delivering Accessory Dwelling Units that balance architectural cohesion, independent functionality, and long-term durabilit. Call us today at (253) 881 6652 or schedule a consultation to start your ADU project.