If your family is growing or your needs are changing, you don’t have to leave the neighborhood you love. A custom home addition is the perfect solution—and Royalty Builders is here to make it happen. As Portola Valley’s trusted home addition contractor, we bring unmatched experience, innovative design, and high-quality construction to every project. Whether you’re dreaming of a new kitchen, bathroom, sunroom, or an entire second floor, our team will guide you from concept to completion with care and professionalism.

Your Local Home Addition Experts in Portola Valley

Royalty Builders has proudly served Portola Valley and the surrounding Bay Area for years, earning a reputation for top-tier craftsmanship, excellent customer service, and smart design. We understand the unique charm of homes in Portola Valley—from mid-century estates to contemporary retreats—and we’re committed to enhancing that character, not replacing it.

Our team is deeply familiar with local building codes, environmental regulations, and architectural styles. We manage every step of the process: from city permits and structural planning to the final coat of paint. When you work with Royalty Builders, you get a partner who truly understands what it means to build in Portola Valley.

Kitchen Addition in Portola Valley

The kitchen is the heart of your home—and if yours feels cramped or outdated, a kitchen addition can transform it into a functional and inspiring space. At Royalty Builders, we specialize in designing kitchen additions that reflect your style, meet your practical needs, and elevate your home’s value.

We work closely with you to design a layout that flows naturally with the rest of your home. Whether it’s expanding for a large island, creating space for entertaining, or integrating more natural light with custom windows and skylights, we ensure the finished kitchen feels like a seamless part of your home. Our team handles everything—from structural changes to plumbing and electrical—so you can focus on the joy of your new kitchen.

Bathroom Addition in Portola Valley

Adding a bathroom isn’t just a convenience—it’s a lifestyle upgrade. Whether you need an extra full bathroom for a growing household, a powder room for guests, or a luxury en suite for your primary bedroom, Royalty Builders makes the process easy and stress-free.

We design bathrooms that combine beauty and function, with smart layouts, elegant finishes, and high-quality fixtures. Our experts will help you maximize space and comfort, while also navigating the specific plumbing and code requirements in Portola Valley. With us, your new bathroom won’t just look amazing—it’ll feel like it’s always been there.

Sunroom Addition in Portola Valley

Imagine enjoying the natural beauty of Portola Valley from a cozy, light-filled sunroom year-round. A sunroom addition from Royalty Builders gives you a peaceful retreat that bridges indoor comfort with outdoor views.

We build custom sunrooms designed to enhance your home and lifestyle—whether you want a serene reading nook, a space for plants and morning coffee, or an open-air dining area. Our team uses energy-efficient windows, quality materials, and seamless design to make your sunroom both beautiful and durable. With Royalty Builders, your new space will feel like a natural extension of your home—not an afterthought.

Second-Story Addition in Portola Valley

Running out of space but don’t want to sacrifice your backyard? A second-story addition is the perfect solution. At Royalty Builders, we’ve helped dozens of homeowners in the Bay Area double their living space while maintaining the footprint and aesthetic of their homes.

Building up is complex—it requires structural evaluations, thoughtful design, and expert execution. We handle it all. From reinforcing the foundation to framing, roofing, and finishing touches, we ensure your new second story meets every safety and design standard. We’ll also match your home’s existing architecture to create a harmonious and elevated result.

Home Addition Costs in Portola Valley

Understanding the cost of a home addition is an important step in the process—and we believe in transparency every step of the way. At Royalty Builders, we provide clear, detailed estimates based on your specific project goals, site conditions, and materials.

🏠 Interior Home Addition Costs:

• Kitchen Addition: $100,000–$180,000

• Bathroom Addition: $50,000–$100,000

• Second Story: $200,000–$400,000

• Sunroom: $60,000–$120,000

🚧 Exterior Construction Includes:

• Foundation and structural work

• Roofing and siding integration

• Custom windows, insulation, electrical & plumbing systems
  No two homes are the same, which is why we tailor every quote to your needs. Schedule a free consultation, and we’ll walk you through all the options, timelines, and budget planning.

📌 Costs can vary based on structural work, custom finishes, Portola Valley’s zoning and environmental requirements, and the current condition of your home. At Royalty Builders, we’ll guide you through every step with full transparency—so you feel confident in your decisions and there are no unexpected surprises along the way.

Why Choose Royalty Builders for Your Portola Valley Home Addition?

Choosing the right contractor is the difference between a dream home and a stressful project. At Royalty Builders, we pride ourselves on making the experience as smooth and satisfying as the results. Our work is defined by quality, integrity, and attention to detail.

Here’s what sets us apart:

• ✔️ Decades of experience in Portola Valley and surrounding cities

• ✔️ Licensed, insured, and locally trusted

• ✔️ Full-service team: architects, project managers, and craftsmen under one roof

• ✔️ Excellent communication and clear timelines

• ✔️ Stunning results that match your home’s architecture and your lifestyle

From the first sketch to the final nail, we’re with you every step of the way.

Frequently Asked Questions – Home Addition in Portola Valley

How long does a typical home addition take?
Depending on the size and complexity, most additions take between 3 to 6 months. We’ll provide a personalized timeline after the consultation.

Will Royalty Builders handle all the permits?
Yes. We take care of all necessary permits, engineering, and code compliance for building in Portola Valley.

Can you match the new addition to the existing structure?
Absolutely. Seamless integration is one of our specialties. From rooflines to finishes, our goal is to make it look like the addition was always part of your home.

Do you offer financing or phased construction?
We offer flexible solutions depending on your budget and needs. Let’s talk during your consultation.

Is a home addition worth the investment?
Yes—especially in high-value areas like Portola Valley. A well-designed addition enhances both your daily life and your property’s resale value.

Contact Royalty Builders – Start Your Portola Valley Home Addition Today

When you’re ready to expand your home, don’t settle for less than the best. Royalty Builders is here to help you design, build, and enjoy a beautiful new space—built with care, quality, and local expertise.

📞 Call us today or
📩 Schedule a Free Consultation
📍 Serving Portola Valley and the entire Peninsula

Let’s turn your home into everything it can be.