San Martin offers the perfect blend of open space, privacy, and rural luxury. At Royalty Builders, we help homeowners in San Martin make the most of their properties with custom home additions designed to enhance your lifestyle and long-term value. Whether you’re looking to expand your living space, add functionality, or create a luxurious retreat, we specialize in seamless, high-quality additions that blend beautifully with your existing home.

From large estate-style expansions to elegant single-room upgrades, we manage every detail from start to finish—ensuring a stress-free and stunning result.

Custom Kitchen Additions in San Martin

Your kitchen should be the heart of your home—spacious, stylish, and designed for your family’s needs. Our kitchen additions in San Martin offer you the chance to expand and upgrade with custom layouts, stone countertops, center islands, walk-in pantries, and high-end appliances. Whether you’re planning a modern gourmet kitchen or a cozy country-style cooking space, we’ll bring your vision to life with functionality and elegance.

Stylish Bathroom Additions in San Martin

Need another bathroom or ready to build the spa-inspired suite you’ve always wanted? Our bathroom additions in San Martin are tailored to your taste and lifestyle. We build luxurious master baths, private guest bathrooms, and practical family-friendly layouts. Popular features include frameless glass showers, freestanding tubs, radiant heated floors, dual vanities, and designer tilework—all crafted to match your home’s style and elevate your daily routine.

Beautiful Sunroom Additions in San Martin

Enjoy San Martin’s scenic surroundings and natural light with a bright, relaxing sunroom addition. Whether you want a peaceful retreat, a garden-view lounge, or a light-filled workspace, our custom sunrooms are built for year-round enjoyment. We use energy-efficient windows, durable materials, and thoughtful design to ensure your sunroom feels like a seamless part of your home—both inside and out.

Functional Room Additions in San Martin

Your home should grow with your needs. Our room additions in San Martin are ideal for adding extra bedrooms, home offices, playrooms, gyms, or hobby spaces. Whether you’re expanding for family or function, our design-build team ensures your new space fits naturally with the rest of your home—both structurally and stylistically. We focus on smart layouts, top-quality materials, and custom finishes that enhance your comfort and flexibility.

Second Story Additions for More Living Space

If your lot is limited but your vision is big, a second-story addition can be the perfect solution. We build upper-level expansions that include extra bedrooms, bathrooms, lofts, or even full guest suites—without sacrificing your outdoor space. Our team manages the entire process, including structural engineering, permit handling, and interior finishing, to deliver a new level of living that adds value and beauty to your San Martin home.

Home Addition Costs in San Martin – Know What to Expect

We provide honest, transparent pricing based on the scope of your project and the unique aspects of your home. Here’s a general guide to home addition costs in San Martin:

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

• Room Additions (ground level): $180–$300 per sq. ft.

• Sunroom Additions: $20,000–$70,000+

• Garage Conversions / ADUs: Starting around $20,000

Final costs depend on design complexity, structure, finishes, and permit requirements. We’ll walk you through everything up front.

Why Choose Royalty Builders for Your San Martin Home Addition?

• Local Knowledge: We understand San Martin’s zoning laws, property layouts, and construction expectations.

• Design-Build Experts: We handle everything—from design and permits to final construction and finishing.

• Customized Solutions: Every project is tailored to your vision, lifestyle, and property style.

• Top-Tier Craftsmanship: We use high-quality materials and deliver beautiful, long-lasting results.

• Reliable & Transparent: No surprises—just clear communication and expert project management.

Your Trusted Home Addition Contractor in San Martin

At Royalty Builders, we bring creativity, professionalism, and precision to every home addition we build in San Martin. Whether you’re expanding for your growing family, creating a dedicated space for hobbies or work, or investing in your property’s future, we’re here to help. Our team is committed to turning your ideas into reality—with care, craftsmanship, and a process you can trust.

Contact Us Today

Ready to expand your San Martin home? Let’s create the space you’ve been dreaming about. Contact Royalty Builders today to schedule your free consultation.
Call us or fill out our quick contact form—we’re excited to learn about your vision and bring it to life with expertise and care.

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

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

• Standard Grade Construction: Approximately $145.93 per square foot, with a range between $112.75 and $179.10 per square foot. ​

• Premium 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 Martin?
A: Yes, obtaining a building permit is required for most home addition projects in San Martin. The Santa Clara County Department of Planning and Development oversees the permitting process for unincorporated areas like San Martin. A building permit must be obtained before you construct, enlarge, alter, move, replace, repair, improve, convert, demolish, or change the occupancy of a building or structure. Certain minor work may be exempt from permits, such as one-story detached accessory structures not exceeding 120 square feet. Our team manages the entire permitting process to ensure your project adheres to all local codes and regulations. ​sodhg.com+4Department of Planning and Development+4CSLB+4

Q3: How long does a typical home addition project take in San Martin?
A: The duration of a home addition project in San Martin 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 Martin?
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 Martin?
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.

📞 Call us or 📩 fill out our online form to get started. Let’s build something extraordinary—together.