Home Additions in Olympia, WA

Seamless Design-Build Expansion Experts

Create the space you need without leaving the home you love. 4th Dimension Construction is Olympia’s trusted design-build contractor for custom home additions, proudly serving homeowners throughout Olympia and the surrounding neighborhoods of Western Washington.



Whether you’re expanding for a growing family, adding functionality, or increasing property value, our team designs and builds additions that blend seamlessly with your existing home — inside and out.

The Design-Build Advantage for Home Additions

Adding onto your home requires careful planning, structural expertise, and clear coordination. Our design-build approach ensures your addition is thoughtfully designed and expertly built by one unified team.

What our design-build process delivers:

• Custom architectural design tailored to your home
• Efficient planning, budgeting & scheduling
• Permit coordination & project management
• Structural integration & high-quality construction
• One point of contact from concept to completion



By keeping everything under one roof, we reduce delays, avoid miscommunication, and deliver a smoother, more predictable remodeling experience.

Custom Home Additions Designed Around Your Needs

Every addition we build is customized to enhance both function and flow — while matching your home’s style and character.

Our home addition services include:

• Primary suite additions
• Bedroom & bathroom additions
• Family room & living space expansions
• Home office & flex space additions
• In-law suites & guest quarters
• Second-story additions
• Garage conversions & expansions



From design to final finishes, we ensure your new space feels like it was always part of your home.