Custom ADU Construction Built to Expand Your Property
Seattle ADU projects designed for zoning compliance, tight urban lots, and long-term rental or family use.
Professional ADU Construction for Residential Properties
A thoughtfully planned ADU can serve many purposes—from rental income and guest housing to multi-generational living or private workspace.
Top Quality Construction Group provides full-service ADU construction, managing everything from early feasibility and design coordination to permitting, construction, and final inspection. Our approach focuses on clear planning, structural integrity, and long-term performance—so your ADU works well today and continues to add value over time.
Our work is grounded in clear planning, local code compliance, and construction methods designed for long-term performance.
Our ADU construction services include:
- Detached backyard ADUs
- Garage conversions and rebuilds
- Attached ADUs and home additions
- Structural framing, foundations, and utilities coordination
- Code-compliant construction and inspections
- Finish work designed for durability and livability
A Trusted Partner for ADU Planning & Construction
Building an ADU is a significant investment that requires careful planning and experienced execution.
Our team takes a structured, transparent approach—setting expectations early and delivering work that meets local building standards.
- Clear project planning with defined scopes and milestones
- Licensed and insured construction aligned with local requirements
- Experience coordinating zoning, permitting, and inspections
- Structural craftsmanship focused on longevity and livability
- Organized job sites and consistent communication throughout the build
Rather than rushing complex builds or oversimplifying decisions, we focus on creating ADUs that function well, meet code, and continue adding value long after construction is complete. Our role is to help you make informed choices and deliver a finished space that feels intentional, durable, and well executed.
Our ADU Planning & Construction Approach
Accessory Dwelling Units require careful coordination between property constraints, local regulations, and long-term use considerations.
Our process is designed to clarify options early, reduce surprises, and guide projects from concept through completion with structure and transparency.
Phase 1: Property Feasibility & Use Evaluation
We begin by reviewing your property layout, access points, existing structures, and intended use for the ADU. This step helps determine what configurations are viable and identifies potential limitations before design decisions are made.
Phase 2: Concept Development & Scope Definition
Based on feasibility findings, we help shape the overall concept—refining size, layout, and general design direction. Project scope, priorities, and expectations are aligned so decisions remain consistent throughout the build.
Phase 3: Permitting Coordination & Pre-Construction Planning
Plans and documentation are prepared and coordinated to support required permits and approvals. This stage ensures the project is positioned to move forward smoothly before construction begins.
Phase 4: Structural Build-Out & Installation
Construction moves forward with an emphasis on structural integrity, code compliance, and build quality. Framing, utilities coordination, and interior build-out are completed in accordance with approved plans and specifications.
Phase 5: Completion & Review
Once construction is complete, we review the finished ADU with you to confirm that the work aligns with the original plan and expectations. Final details are addressed so the space is ready for use with confidence.
Considering an ADU for Your Property?
ADU projects involve zoning rules, layout tradeoffs, and long-term planning decisions. A brief consultation can help clarify feasibility and next steps.
ADU Construction FAQs
Below are answers to some of the most common questions homeowners ask when researching ADU construction.
Eligibility depends on factors such as lot size, zoning regulations, existing structures, access, and utility connections. A feasibility review is the best way to determine what type of ADU may be possible on your property.
Yes. We help coordinate layout planning and design considerations to ensure the ADU is functional, code-compliant, and aligned with how the space will be used.
Yes. ADU projects require permits and inspections. We coordinate required documentation and inspections as part of the construction process to help keep the project moving forward.
Timelines vary based on design complexity, permitting requirements, and site conditions. Most ADU projects take several months from approval to completion.
Cost is affected by size, layout, structural requirements, utility connections, finishes, and site accessibility. During consultation, we help outline the major cost considerations involved.
In many cases, yes. Conversion feasibility depends on zoning rules, structural condition, and layout constraints. We can help evaluate whether a conversion or new build is the better option.
A well-planned ADU can increase property flexibility and long-term value, though results vary depending on location, design quality, and intended use.
Yes. We construct attached ADUs, detached backyard units, and conversions, depending on what works best for the property and project goals.
The Practical Value of a Well-Planned ADU
An ADU changes how a property functions, not just how it looks. When designed and built with long-term use in mind, it can provide independent living space that feels intentional, comfortable, and well integrated with the main home.
A professional approach helps ensure the ADU meets structural requirements, complies with local regulations, and holds up to daily use without constant maintenance concerns.
Advantages of a professionally built ADU include:
- Flexible living space for guests, family members, or private use
- Improved property functionality without the need to relocate
- Construction aligned with current building and safety standards
- Layouts designed for everyday comfort and efficiency
- Long-term durability that supports extended use or rental scenarios
A thoughtfully executed ADU supports changing lifestyle needs while strengthening the overall utility and value of the property.
Testimonials
Proudly Serving the Greater Seattle Metro and Beyond
From Seattle to Puyallup, Lynnwood to Tacoma – Top Quality Construction Group offers full-service remodeling, additions, and exterior improvements across Western Washington. More locations coming soon.
North Seattle & Snohomish County
- Lynnwood
- Bothell
- Everett
- Lake Stevens
- Marysville
- Snohomish
- Mill Creek
Central & Eastside Core
- Seattle
- Bellevue
- Kirkland
- Redmond
- Renton
- Newcastle
- Issaquah
South Sound Region
- Tacoma
- Puyallup
- Kent
- Auburn
- Federal Way
- Maple Valley
- Gig Harbor
Discuss Your ADU Options with a Professional Team
Building an ADU is a significant investment that requires the right planning upfront. We work with Seattle homeowners to evaluate property constraints, clarify design possibilities, and align the project scope with long-term goals before moving forward.
Prefer to speak directly? Call (206) 712-0500.
We typically respond within one business day.
