ADU & Basement Conversions in Seattle, WA
Full-service ADU and basement conversions that transform unused space into beautiful, functional living areas. From design to construction, we handle it all—no hassle, no mess, just expert craftsmanship from the #1 trusted ADU builders and basement remodeling contractor company in Seattle WA.
Over 11,000 Homes Remodeled
Industry-Best, Long-Term
Warranties
Durable, High-Quality Materials & Remodeling Experts
Complete World-Class Installation & Clean-up
Free Expert Design Services & Consultation
Financing Available on Home Improvement Jobs
If you want build yourself a brand new ADU, or to convert your old unused basement into a cool living space we can help. We have a wonderful financing program and can point you in the right direction for your project from A to Z. Call us today to hear about all of your options.
With Thousands of Basements successfully Remodeled in Washington, LYD is Americas most trusted ADU Remodeling company. We make dreams come true.
We make it simple for you.
From Start to finish, LYD Construction has your dream ADU Covered whether it’s a basement conversion or an additional structure. All you have to do is get started with a free design consultation
- Schedule a FREE Design Consultation
- Customize & Approve your Design
- Get Financing Approved if need be
- Begin your project with our trusted project manager, our team of licensed experts are quick, skilled and clean.
START YOUR ADU PROJECT TODAY!
Transform your backyard into opportunity with LYD Construction’s expert Accessory Dwelling Unit (ADU) services. Whether you’re building a rental unit, a guest house, or a private retreat for family, we make the process simple from start to finish.
Our design-build team helps you create a fully functional and stylish living space that fits perfectly within your property and local zoning requirements. We handle permits, design, construction, and finishing details — delivering a beautiful, code-compliant ADU that adds value and versatility to your home.
From garage conversions to detached backyard units, we bring your vision to life with expert craftsmanship and attention to detail — all while staying on schedule and within budget.
Expand your home, generate income, and add lasting value — start your ADU project today.
START YOUR BASEMENT CONVERSION PROJECT TODAY!
Don’t let your basement go to waste — turn it into a vibrant, livable space with LYD Construction. Our basement conversion specialists transform dark, unused areas into beautiful extensions of your home — whether it’s a rental unit, home office, gym, or entertainment suite.
We take care of everything from waterproofing and insulation to permits and design, ensuring every square foot meets safety and comfort standards. Our experienced builders maximize your basement’s layout, bringing in natural light, quality finishes, and modern functionality.
At LYD Construction, we make the process seamless — fast timelines, clear communication, and stunning results that increase your home’s comfort and resale value.
Reimagine your basement. Reinvent your home.
TURN YOUR GARAGE INTO A BEAUTIFUL GUEST HOUSE
Ready to transform your unused garage into a stunning, fully livable guest house? At LYD Construction, we specialize in designing and building garage conversions that combine smart space planning, elegant design, and exceptional craftsmanship.
Whether you want to create a private suite for family, a rental unit for extra income, or a peaceful backyard retreat, our team handles every detail — from architectural design and permits to plumbing, insulation, and finishing touches.
We take pride in turning underutilized spaces into beautiful extensions of your home that add value, comfort, and versatility. Our experts work with you to customize layouts, select materials, and ensure your new guest house is energy-efficient, code-compliant, and designed to last.
Transform your garage into a modern, welcoming living space — designed and built by LYD Construction.
Over Thousands of Happy Home Improvement Customers
Start Your ADU project today!
Remodeling your basement or building an ADU should be a stress free process. We will make it easy and effortless.
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Frequently Asked Questions
Yes, many homeowners can convert an existing basement into an attached accessory dwelling unit (ADU) in Seattle, WA. The space must meet applicable building, safety, ventilation, ceiling height, and egress requirements. A professional contractor like LYD Construction can evaluate your basement and help determine the best approach for a functional, code-compliant conversion.
Yes, a permit is generally required when converting a basement into a legal ADU in Seattle, WA. Depending on the project scope, additional electrical, plumbing, or other approvals may also be necessary. Working with an experienced contractor such as LYD Construction can help streamline the planning and construction process.
A basement ADU in Seattle, WA may need to meet requirements related to safe exits, ceiling height, moisture protection, insulation, plumbing, electrical systems, and independent living facilities. Every property is different, so a professional site evaluation is the best way to determine what upgrades your basement may require.
In many cases, converting an existing basement can be more cost-effective than building a new detached ADU because the project may use the home’s existing foundation and structure. However, costs can increase if major waterproofing, excavation, ceiling modifications, utility upgrades, or structural work are required.
Yes, a professionally designed basement conversion can add valuable usable living space and may improve your property’s overall appeal. A basement ADU can potentially serve as a rental unit, guest suite, multigenerational living space, or private home office. LYD Construction can help Seattle homeowners design ADU and basement conversion solutions based on their property and lifestyle needs.