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Home Additions
in Berkeley & Marin County

Expanding your home without leaving the neighborhood you love.

More Space, Same Address

You love your location. You love your neighborhood. You love your views. But your family has grown, your needs have changed, or you simply need more space to live the way you want.

We specialize in home additions that seamlessly integrate with your existing structure, whether it’s expanding up with a second-story addition, extending out with new living space, or creating a dedicated primary suite. From foundation excavation to architectural finishes, we handle the structural complexities and design coordination that ensure your addition feels like it was always part of the home.

Our clients are investing $500K–$2M+ to add 500–1,500 square feet across the Berkeley Hills, Mill Valley, and surrounding Bay Area communities. These aren’t simple bump-outs—they’re carefully engineered expansions that require foundation work, structural modifications, and meticulous execution to blend seamlessly with the original architecture.

"The entire team is excellent at communication, quick to respond, and does quality work. It was a joy to have them around during construction. We love the finished product, and appreciated the post-construction check-ins to make sure everything was working as intended. Managing Director Jorge is a gem: always taking notes on details and helping to manage the strange things that come up in a big construction project."

— Homeowner

Selected Works

Cliffside Addition in Berkeley

Oakland Hillside Deck

In Progress: Mill Valley Addition

Oakland Hillside Deck

In Progress: Mill Valley Addition

Room to Grow

Home additions give you the opportunity to expand exactly where you need it. Recent projects include:

Second-Story Primary Suites Kitchen & Great Room Expansions Accessory Dwelling Units (ADUs) Home Office & Studio Spaces Expanded Decks & Outdoor Living Garage Conversions

Every addition is designed to feel like it’s always been part of your home—architecturally cohesive, structurally sound, and built to last.

The challenge with additions is making the new and old work together structurally, aesthetically, and functionally. Our team’s architectural training and construction expertise ensure that your addition blends seamlessly with your existing home.

Jorge Escobedo, our Managing Director and Estimator, brings architectural oversight to every addition, ensuring the design respects the original architecture while meeting modern building codes. Jairo Laverde, our Project Manager, coordinates between your architect, structural engineer, and our field team to ensure the transition between old and new is flawless.

We’ve built second-story additions that required complete foundation reinforcement, expanded homes on steep hillside lots, and created ADUs that navigate complex zoning regulations. Whatever the challenge, we solve it.

Financial Certainty. Peace of Mind.

Every evening, you receive a shared Google Photos album with progress shots and drone footage. You'll always know exactly what happened on your site that day.

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We don't work on time-and-materials. After our Professional Services Agreement (PSA) phase—a paid feasibility study that investigates site conditions, permitting, and budget realities—we provide a fixed-price contract. No surprise invoices. No scope creep.

Signing document

Our detailed project schedules are updated at least twice monthly and shared with you and your architect. You'll see every milestone, every lead time, and every built-in buffer.

gnatt chart on a laptop

We conduct weekly meetings with you and your architect to review progress, solve field conditions, and ensure continuous alignment throughout construction.

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We maintain exceptionally clean and organized job sites, including neatly managed fencing, wrapped portable toilets, and proactive neighborhood communication to minimize disruption.

Vought Construction stills

Understanding Setbacks, Zoning & Structural Codes

Adding to your home in Berkeley and Marin County means navigating setback requirements, height limits, floor area ratio (FAR) calculations, and complex structural codes. We are experts in the permitting and engineering complexities of the Bay Area, ensuring your addition meets all requirements without compromising design.

From coordinating with structural engineers on foundation reinforcement to managing Title 24 energy compliance and accessibility requirements, we handle the bureaucracy so you and your architect can focus on the design.

For the Architect

We protect the design intent while solving the structural realities of existing homes. From early feasibility studies to the final reveal, we ensure the budget supports the vision rather than compromising it.

We engage during design—not after. Our team provides real-time feedback on structural feasibility, code requirements, and budget implications, significantly reducing surprises during construction. We see architects as partners, not vendors, and we collaborate with top-tier Bay Area design studios on additions that honor the original architecture while creating beautiful new space.

Whats Included

Our home additions are comprehensive expansions that include:

Investment & Timeline

Standard Addition

High-quality finishes, durable materials.

$1,000 per square foot

Deluxe Addition

Elevated materials and custom details.

$1,200–$1,600 per square foot

Premium Addition

The highest level of craftsmanship and materials.

$1,700–$2,000+ per square foot

Most home additions take 4–12 months from design through completion, depending on project scope, permitting complexity, and material lead times.

Second-story additions are more costly than ground-floor expansions because they require structural work on the first floor—including new framing, foundation reinforcement, additional mechanical/electrical/plumbing systems, and new finishes throughout the existing space to tie everything together.

Frequently Asked Questions About Home Additions In Berkeley

How large is the average addition in Berkeley and throughout the Bay Area?

The average size for a home addition in Berkeley and throughout the Bay Area is around 500 sq ft. This space is typically enough to significantly enhance your living area, whether adding a new bedroom, extending your living room, or creating a dedicated office space. It’s a popular choice for homeowners looking to expand their living space without the need to relocate.

For a 500 sq ft addition in the Bay Area, costs usually range from $450,000 to over $650,000. This estimate depends on factors like the type of addition, the materials chosen, and any special upgrades you might want. 

We ensure every addition is a perfect blend of functionality and aesthetics, tailored to your needs and budget.

Completing a home addition in Berkeley takes between 7 to 9 months. This time frame includes everything from initial design to final touches, ensuring the addition seamlessly integrates into your existing home. 

Our team is committed to efficient project management while maintaining high-quality standards.

Absolutely! At Vought Construction, we specialize in creating additions that look like they’ve always been part of your home. We meticulously match the new exterior with your existing home’s design, ensuring a cohesive and harmonious appearance.

Yes, we ensure proper permit acquisition for your home addition. Our team coordinates with your engineer or architect to ensure that every aspect of the project complies with local building codes and regulations.

We offer comprehensive design assistance as part of our home addition services. Our team works closely with you to understand and bring your vision to life, ensuring the final design is beautiful and functional.

While we typically work with a trusted team of subcontractors known for their quality work, we are open to collaborating with other professionals of your choosing. We aim to ensure that your home addition meets your specifications and quality standards.

We maintain clear and consistent communication throughout the project. You can reach us via text, phone, or email; we also conduct in-person meetings. 

We’re flexible and adaptable to whatever communication method works best for you.

At Vought Construction, we handle key aspects like foundation laying, framing, and finish carpentry in-house. For other specialties, we collaborate with our experienced subcontractors, ensuring every part of your addition is executed to the highest standards.

Yes, we have a full-time superintendent and a project manager overseeing each project. Their roles are crucial in ensuring that your home addition is completed on time, within budget, and to your satisfaction.

Every addition carries a 5-year craftsmanship warranty on the finishes, built-ins, cabinetry, tile, and trim within our scope. We build homes meant to last, and we stand behind the work long after the last crew leaves.

Let's Talk About Your Project