Home Addition in Foster City – Expand Your Space with Style

At Royalty Builders, we specialize in creating custom home additions in Foster City that not only increase your living space but also enhance your home’s style and value. Whether you’re envisioning a practical expansion or a luxury upgrade, our team delivers tailored solutions that integrate seamlessly with your existing home architecture. From concept to completion, we ensure every detail aligns with your needs and the upscale, coastal charm of Foster City.

Custom Kitchen Additions in Foster City

Is your kitchen feeling cramped or outdated? Our kitchen addition services in Foster City are designed to expand your space and bring modern convenience into your daily routine. Whether you’re dreaming of a chef-worthy cooking space, a stylish open-concept layout, or extra seating for entertaining, we help transform your kitchen into the heart of your home. From custom cabinetry and quartz countertops to built-in islands and energy-efficient appliances, we combine beauty with functionality to give you the kitchen you’ve always wanted.

Stylish Bathroom Additions in Foster City

A bathroom addition can greatly enhance both comfort and property value—especially in Foster City where home equity is at a premium. Whether you need a guest bathroom, a kid-friendly layout, or a luxurious spa-inspired master suite, we offer bathroom additions in Foster City tailored to your vision. With features like walk-in showers, soaking tubs, dual vanities, and heated flooring, we create spaces that are as relaxing as they are refined.

Beautiful Sunroom Additions in Foster City

Enjoy the natural beauty and sunlight of Foster City all year round with a custom-built sunroom. Our sunroom additions are ideal for reading, entertaining, relaxing, or even working from home. We use high-performance, energy-efficient windows and durable materials to ensure comfort in all seasons. Whether you envision a cozy retreat filled with greenery or a bright, welcoming space for hosting, we design sunrooms that enhance your indoor-outdoor lifestyle.

Functional Room Additions in Foster City

If your growing family needs more space, or you’re transitioning to remote work, our room additions in Foster City are designed to meet your evolving needs. Whether it’s an extra bedroom, a home office, a gym, or a media room, we focus on smart, intentional design. Every addition is planned for structural integrity, flow, and style—ensuring it feels like a natural part of your home.

Second Story Additions for More Living Space

Don’t have room to build out? Build up. A second-story addition is a great way to expand your home’s footprint without compromising your backyard or lot space. Our second-story additions in Foster City include complete upper-level expansions with bedrooms, bathrooms, lofts, and flex spaces. We pay careful attention to weight distribution, roofing, and design to maintain harmony with your existing structure—while significantly increasing your home’s livable square footage.

Home Addition Costs in Foster City – What to Expect

We know that home additions are a major investment. That’s why we offer transparent estimates and competitive pricing that reflect the quality of materials, craftsmanship, and location-specific considerations in Foster City.

Interior Additions

• Kitchen Addition: $250–$400 per sq. ft., depending on layout and finishes

• Bathroom Addition: $25,000–$60,000+ depending on complexity

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

Exterior Additions

• Room Extensions: $180–$300 per sq. ft.

• Sunrooms: $20,000–$70,000+

• Garage Conversions: Starting from $20,000+

💡 Note: Costs can vary based on zoning regulations, design complexity, material choices, and structural requirements.

Why Choose Royalty Builders for Home Additions in Foster City?

• ✅ Local Expertise: We’re familiar with Foster City’s architectural style, building regulations, and permit processes.

• ✅ Premium Craftsmanship: Our licensed professionals deliver high-quality work with attention to detail.

• ✅ Turnkey Solutions: We handle everything from initial design and permitting to final construction.

• ✅ Customer-First Approach: We offer flexible scheduling, open communication, and satisfaction guarantees.

Your Local Home Addition Experts in Foster City

Whether you’re looking to build upward, outward, or somewhere in between, Royalty Builders brings your vision to life with professionalism and precision. We’ve worked with homeowners throughout the Bay Area, and we’re proud to serve the Foster City community with home additions that reflect your lifestyle and goals.

Let’s Build Your Dream Space

Ready to expand your home? Let’s talk! Contact Royalty Builders today for a free, no-obligation consultation. Whether you’re adding a room, creating a second story, or designing a custom kitchen, we’ll help you make it happen—beautifully and seamlessly.

Contact Us Today

Thinking about a home addition in Foster City? Let Royalty Builders help you bring your vision to life. Our experienced team is ready to guide you through every step—from design and planning to construction and finishing touches. Whether you’re ready to get started or just exploring your options, we’re here to answer your questions and provide expert advice.
📞 Call us today or 📩 fill out our contact form to schedule your free, no-obligation consultation. Let’s build the space you’ve always dreamed of—together.

Frequently Asked Questions (FAQ) – Home Additions in Foster City

Q1: How much does a home addition typically cost in Foster City?
A: The cost of a home addition in Foster City varies based on factors like size, design complexity, and material choices. On average:

• Standard Grade Construction: Approximately $150 per square foot.​

• High-End Construction: Costs can range 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 Foster City?
A: Yes, a building permit is required for most interior and exterior changes, excluding minor cosmetic updates like painting or carpeting. This ensures compliance with local building codes and safety standards. ​Foster City

Q3: How long does a typical home addition project take in Foster City?
A: The duration varies based on the project’s scope and complexity. Generally, home addition projects in Foster City can take several months from design to completion. Factors influencing the timeline include permitting processes, design approvals, and construction phases.​

Q4: Can you match the style of my existing home in Foster City?
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 Foster City?
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.