San Jose is the heart of Silicon Valley—where innovation meets family living, and space is at a premium. At Royalty Builders, we specialize in custom home additions in San Jose that provide the extra room you need while enhancing your home’s comfort, beauty, and long-term value. Whether you’re building up, expanding out, or creating a dedicated space for work or play, we make the process simple, smooth, and tailored to your lifestyle.

With a deep understanding of San Jose’s permitting process, diverse architecture, and neighborhood styles, our team ensures every project blends seamlessly with your home and surroundings.

Custom Kitchen Additions in San Jose

Does your current kitchen feel too small, outdated, or closed off? Our kitchen additions in San Jose are designed to improve functionality, flow, and overall appeal. Whether you’re dreaming of a chef-style kitchen with top-of-the-line appliances or a spacious open-concept layout perfect for entertaining, we’ll bring your vision to life. We specialize in custom cabinetry, quartz countertops, stylish islands, energy-efficient lighting, and layouts that make cooking and gathering more enjoyable.

Stylish Bathroom Additions in San Jose

A well-designed bathroom addition can completely transform your home. Our bathroom addition services in San Jose include everything from compact powder rooms to luxurious master suites. We incorporate features like modern vanities, walk-in showers, freestanding tubs, and heated floors—all while maintaining harmony with your existing design. Whether you’re adding convenience for guests or creating a personal spa-like escape, we’ll craft a space that fits your needs and your style.

Beautiful Sunroom Additions In San Jose

San Jose’s pleasant climate makes a sunroom the perfect year-round retreat. Our sunroom additions are ideal for relaxing, entertaining, working from home, or simply enjoying the sunlight. We design each sunroom with energy-efficient windows, climate control options, and seamless architectural integration. Whether you envision a plant-filled sanctuary or a bright, multi-use family space, we’ll build a sunroom that elevates your living experience.

Functional Room Additions in San Jose

Need more room to breathe? Our room additions in San Jose are perfect for creating home offices, guest bedrooms, playrooms, gyms, or media spaces. Every room is custom-built to suit your home’s layout, aesthetics, and structure. We handle everything from design and engineering to permits and finishes—ensuring a beautiful, practical expansion that feels like it’s always been part of your home.

Second Story Additions for Maximum Space

Running out of room on the ground level? A second-story addition can give you the space you need without sacrificing your yard. Whether you’re adding multiple bedrooms, bathrooms, or even a complete upper-level suite, we manage every aspect of the build—ensuring a structurally sound and visually cohesive second story. In San Jose’s high-value real estate market, building up is a smart way to increase both space and equity.

Home Addition Costs in San Jose – What to Expect

Every home addition is unique, but we’re committed to transparent pricing. Here’s a general overview of home addition costs in San Jose:

Interior Additions

• Kitchen Additions: $250–$400 per sq. ft.

• Bathroom Additions: $25,000–$60,000+

• Second Story Additions: $200–$500 per sq. ft.

Exterior Additions

• Ground-Level Room Additions: $180–$300 per sq. ft.

• Sunroom Additions: $20,000–$70,000+

• Garage Conversions / ADUs: Starting at $20,000+

📌 Final cost depends on design complexity, materials, structural work, and permit fees. We’ll guide you through it with full clarity.

Why Choose Royalty Builders for Your San Jose Home Addition?

• ✅ Local Expertise: We understand San Jose’s zoning laws, permitting systems, and neighborhood styles.

• ✅ Design + Build: From concept to construction, we handle everything in-house for a smooth experience.

• ✅ Tailored Craftsmanship: Every addition is customized to match your needs and enhance your home’s value.

• ✅ Reliable Communication: You’ll always know where things stand—no surprises.

• ✅ Licensed & Insured: Professional, high-quality work backed by experience and credentials.

Your Trusted Home Addition Contractor in San Jose

At Royalty Builders, we believe your home should grow with you. Whether you’re looking to expand your kitchen, add a peaceful sunroom, or build an entirely new level, we’re here to help you turn ideas into reality. We’ve earned the trust of homeowners across San Jose by delivering beautiful, lasting results—on time and on budget.

Contact Us Today

Ready to create the space you need in the home you love? Contact Royalty Builders today for a free, no-obligation consultation. We’ll listen to your goals, review your space, and provide expert recommendations tailored to your vision and budget.
📞 Call us or 📩 fill out our online form to get started. Let’s build the space your San Jose home deserves—together.

Frequently Asked Questions (FAQ) – Home Additions in San Jose

Q1: How much does a home addition typically cost in San Jose?
A: The cost of a home addition in San Jose varies based on factors such as size, design complexity, and material quality. On average:​

• Basic Room Addition: Approximately $300 to $500 per square foot. For a 200 to 400 square foot addition, this equates to about $60,000 to $160,000. ​

• Second-Story Addition: Costs typically range from $450,000 to $1.2 million, depending on size and complexity. ​

• Luxury Grade Construction: Costs can be higher, depending on finishes and customizations.​

For a precise estimate tailored to your project, we recommend scheduling a free consultation with our team.

Q2: Do I need a permit for a home addition in San Jose?
A: Yes, obtaining a building permit is required for most home addition projects in San Jose. The City of San Jose provides an online portal, SJPermits.org, where property owners and qualified contractors can apply for various permits. Our team manages the entire permitting process to ensure your project adheres to all local codes and regulations. 

Q3: How long does a typical home addition project take in San Jose?
A: The duration of a home addition project in San Jose depends on the project’s scope and complexity. Generally, such projects can take several months from design to completion, considering factors like permitting, design approvals, and construction phases.​

Q4: Can you match the style of my existing home in San Jose?
A: Absolutely! Our expertise lies in creating seamless additions that harmonize with your home’s current architectural style and finishes, ensuring a cohesive and aesthetically pleasing result.​

Q5: What types of home additions do you offer in San Jose?
A: We provide a diverse range of home addition services, including:​

• Room Additions: Expanding your living space with additional bedrooms, living rooms, or specialized rooms.​

• Second-Story Additions: Adding a new level to your home to maximize space without expanding the footprint.​

• Kitchen Expansions: Enlarging your kitchen area for enhanced functionality and comfort.​

• Accessory Dwelling Units (ADUs): Creating independent living spaces on your property, perfect for rental income or extended family.​

Each project is customized to align with your specific needs, preferences, and budget.