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Room Addition in Olympia, Washington

At South Bay Build & Remodel, we believe expanding your home should feel seamless, not stressful. As a woman-owned, design-build contractor based right here in Olympia, WA, we specialize in creating additions that blend effortlessly with your existing home — from new bedrooms and bathrooms to second-story expansions, garage conversions, and ADUs.


We’re more than builders. We’re planners, listeners, and partners, turning your vision into reality with transparency, care, and confidence — every step of the way.

Why Choose a Home Addition Contractor in Olympia, WA You Can

Adding space to your home is a big investment — emotionally and financially. That’s why South Bay Build & Remodel focuses on clear communication, precise planning, and seamless integration.


We don’t just add square footage — we design spaces that enhance your lifestyle, function beautifully, and feel like they’ve always belonged.


As a local Olympia company, we understand the Pacific Northwest’s architectural character — from historic South Capitol charmers to modern Westside builds. Our team navigates Olympia’s complex permitting process, moisture control needs, and neighborhood-specific styles so you can enjoy your new space without the stress.

Our Seamless Home Addition Process

1. Discovery Consultation

Your journey begins with a complimentary consultation. We take the time to understand your goals, explore inspiration photos, and assess your home’s potential — whether you need a room addition in Olympia WA or a full ADU build.

2. Design & Planning

Every addition is carefully planned using 3D renderings and mood boards to visualize how your new space will look and flow. You’ll receive detailed quotes upfront — no surprises, no hidden costs.

3. Construction & Communication

Our one coordinated team manages every phase: from excavation to final trim. With our Buildertrend software, you’ll be always in the loop — viewing schedules, budgets, daily logs, progress photos, and material updates in real-time.

4. Final Walkthrough

We finish strong — reviewing every detail together to ensure complete satisfaction. Our workmanship warranty and “do it right the first time” promise give you total peace of mind.

Types of Home Additions We Build

Bedroom Additions

Add restful space for a growing family or guests, designed to blend with your home’s existing flow.

Bathroom Additions

Enjoy comfort and convenience with modern, moisture-resistant finishes and efficient layouts.

Second-Story Additions

Expand upward with engineered precision and flawless integration into your home’s structure.

Garage Conversions & ADUs

Transform underused areas into livable, energy-efficient spaces or independent suites.

Aging-in-Place Additions

Accessibility-driven expansions for long-term comfort and safety.

Each project includes energy-efficient upgrades such as triple-pane windows, solar-ready roofs, and advanced HVAC systems — perfect for Olympia’s ever-changing weather.

Transparency Through Technology

You’ll never wonder what’s next.
Our Buildertrend project management platform gives you full visibility into your project:


  • Real-time schedules, budgets, and daily logs
  • Progress photos and video updates
  • Material tracking and delivery status
  • Easy communication with your project manager

With South Bay, there are no surprises — just results you can trust.

Seamless Integration: Additions That Belong

We don’t “add on” — we blend in. Every trim, tile, and transition is intentional, ensuring your new addition feels like it’s always been part of your home.

Our signature approach:

“We don’t just demo and redo — we plan, match, and integrate.”

That’s the difference between an addition that sticks out and one that feels right.

Local Expertise Rooted in Olympia, WA

As longtime residents and builders in Thurston County, we know Olympia’s homes inside and out.
From Eastside bungalows to Boston Harbor view homes, we’ve helped families across:


  • Olympia
  • Lacey
  • Tumwater
  • Thurston County neighborhoods

Our deep understanding of local building codes, historical property requirements, and zoning regulations means smoother approvals and faster project timelines.

“We know the unique character, architecture, and community of Olympia homes because we live and work here, too.”

A Team That Gets It Right the First Time

Led by Lacy Petty, South Bay Build & Remodel brings together craftsmanship, empathy, and communication. As a woman-owned, A+ BBB-rated home addition company in Olympia WA, we approach every project with respect, organization, and care — values reflected in our reputation and repeat referrals.


We handle every detail — from design and permitting to daily cleanup and final walkthrough — so your project is efficient, beautiful, and stress-free.

Customer Experience: Care, Cleanliness & Confidence

We understand that your home is your sanctuary. That’s why our crews are trained to protect it with:


  • Dust barriers and plastic sheeting
  • Daily cleanup protocols
  • Noise control and respectful scheduling
  • Minimal disruption — you can often stay home during construction

We’re proud of our reputation for clean, detail-oriented job sites and client-first communication.

“We treat every project with the same kindness and compassion we’d serve our own family.”

Proof You Can Trust

  • BBB A+ Rating | 4+ years in business
  • Fully licensed and bonded
  • Washington Department of Labor & Industries registered
  • Active member: Olympia Master Builders & Thurston County Chamber of Commerce

Other Services

Home RemodelingKitchen RemodelingBathroom RemodelingBasement FinishingDemolition ContractorsNew Construction HomesHome Addition Contractors

Start Planning Your Home Addition in Olympia, WA

Your home should grow with you. Whether you need more space, better flow, or room for future plans, South Bay Build & Remodel will make it happen — on time, on budget, and built to last.

Let’s create the space your family needs.


📞 Call (360) 951-4011
📧 Email southbaybuildandremodel@gmail.com
🌐 Visit southbaybuildandremodel.com
➡️ Schedule your free consultation today!

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