ADU Construction
As your local ADU builder based in Lynnwood, we guide you through design, permitting, and construction with one team, so you’re never left coordinating between a designer, a permit runner, and a builder. We treat every project like it’s on our own property, and every client like a neighbor.
ADU Construction Services in the Seattle area
We provide full ADU construction services in the Seattle area, meaning one team handles the design, the permitting, and the build. You get a single point of contact from the first conversation to the final walkthrough, and one team accountable for the whole project.
ADU Design & Planning
Every ADU starts with your goals and your lot. We help you define the right size, layout, and style for how you'll actually use the space.
Permitting & Compliance
Permitting is where a lot of projects stall, so we make it a core part of the service rather than an afterthought.
Full Construction & Project Management
That includes site work and foundation, framing, electrical, and plumbing, interior and exterior finishes, and the final inspection. You're kept in the loop throughout, with clear communication at every milestone.
Types of ADUs MacCoy Builds
ADUs come in a few shapes, and the right type depends on your lot, your budget, and how you want to use the space. Here are a few types of ADU construction we handle.
Detached ADUs / DADUs
Building on to your current home and extending the building or build a detached unit.
Attached ADUs
Additions to an existing home are some of the most common builds. Add rooms, bathrooms and expand the current home.
Garage and Basement Conversions
Take an existing space and turn it into a space you can use.
Multigenerational Living
Enjoy the comfort and proximity of living with family. Add the space you need to accommodate everyone.
Benefits of Building an ADU
Enhance your home with our custom tile and stonework services. We create unique designs
for various spaces, adding elegance and style to your home.
Rental Income
A well-built ADU can generate monthly rental income and add lasting value to your property.
Flexible Living Space
An ADU gives you space that adapts as your life changes. Today it might be a home office; in a few years, a place for a parent who needs support.
Long-Term Property Value
Real estate markets go up and down, but adding more to your property sets you apart from other houses nearby.
Making Better Use of a Lot You Already Own
Instead of upsizing to a bigger house, an ADU lets you make better use of the lot you already own.
Ready to transform your home?
Contact us today to discuss your remodeling needs and schedule a free estimate.
MILs & Cottages
Increase your property’s value and functionality with our ADU and DADU services. We create comfortable living spaces for extended family or rental purposes.
Mother-in-Law Suite, MILs
Create comfortable and private living spaces for extended family with our ADU and DADU services.
Structural & Expansion Services
Maximize your home’s potential with our structural and expansion services. We help you create the perfect space, from basement conversions to structural modifications.
Basement Conversions (Mother-in-Law Suite/ Rental Suite)
Convert your basement into a functional, comfortable living space, ideal for extended family or rental purposes.
Structural Modifications (Wall Removal and/or Partitions)
Modify your home’s layout by removing walls or adding partitions to create the perfect space.
Home Renovation
Transform your entire home with our comprehensive renovation services. We handle everything from interior upgrades to whole-home remodels, ensuring every detail meets your vision.
House Remodel
Full home remodeling services to transform your entire house into your dream home.
Interior Upgrades
Upgrade specific areas of your home’s interior to improve functionality and aesthetics.
Interior Updates
Update your home’s interior design with modern and stylish elements.
Experience the convenience of our design-build approach. From concept to completion, we collaborate with trusted designers to bring your dream home to life.
Custom Remodeling
Tailored remodeling services to meet your specific needs and preferences.
Full Service Remodel
Comprehensive remodeling services that cover every aspect of your project, from planning to execution.
Get a Free Estimate for Your Project
To help guide us toward your vision, please answer a few questions below. We can be of most service to you when we understand your project and your needs. Please be as detailed as possible so that we can better meet your goals. We look forward to meeting you soon. Thank you!