Berkeley is a city that blends creativity, character, and culture—and your home should do the same. At Royalty Builders, we specialize in custom home additions in Berkeley that expand your living space while maintaining architectural integrity and boosting long-term value. Whether you’re living in a charming Craftsman, a modern hillside retreat, or a historic Victorian, we design and build seamless additions that respect your home’s character while elevating its functionality.

With deep knowledge of Berkeley’s zoning regulations, design review processes, and neighborhood styles, we’re here to help you expand with confidence and care.

Custom Kitchen Additions in Berkeley

The kitchen is the heart of your home—and in Berkeley, it’s often a space where creativity and comfort meet. Our kitchen additions in Berkeley are designed to improve flow, increase storage, and add modern features while honoring your home’s architectural style. Whether you want a gourmet layout with premium appliances or an open-concept design for entertaining, we craft kitchens with custom cabinetry, quartz or stone countertops, smart lighting, and high-end finishes.

Stylish Bathroom Additions in Berkeley

Your bathroom should be a private retreat. Whether you need an extra guest bath or want to create a luxury master suite, our bathroom additions in Berkeley combine comfort, beauty, and sustainability. We incorporate features like walk-in showers, freestanding tubs, radiant heating, eco-friendly fixtures, and elegant tilework—designed to complement your home’s unique character.

Beautiful Sunroom Additions in Berkeley

Bring the outdoors in with a light-filled, energy-efficient sunroom that enhances your lifestyle and connects you to nature. Our sunroom additions in Berkeley are perfect for enjoying the garden, working from home, or relaxing with a book. We use sustainable materials, high-performance windows, and thoughtful layouts to ensure your sunroom is comfortable year-round and seamlessly integrated into your home.

Functional Room Additions in Berkeley

Whether you’re adding a bedroom, a home office, a yoga studio, or a guest suite, our room additions in Berkeley are designed with purpose and precision. Every project is tailored to your home’s layout, style, and structural integrity. We’re experienced with working on older homes and historic districts—ensuring that your new space blends in beautifully and functions perfectly.

Second Story Additions for Maximum Living Space

With limited lot space in many Berkeley neighborhoods, second-story additions are a smart way to expand without giving up outdoor space. We specialize in second-story projects that include new bedrooms, bathrooms, family rooms, and more. Our team handles all permitting, engineering, and architectural coordination—ensuring the upper level is both structurally sound and architecturally cohesive with your home’s design.

Home Addition Costs in Berkeley – What to Expect

We provide transparent estimates tailored to the scope and structure of your project. Here’s a general breakdown of home addition costs in Berkeley:

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+

Prices can vary based on hillside location, foundation work, historic requirements, and materials. We provide accurate, detailed quotes up front.

Why Choose Royalty Builders for Your Berkeley Home Addition?

• Berkeley Expertise: We understand local zoning, permitting, design review, and neighborhood expectations.

• Architecturally Sensitive Design: We match your home’s unique style while adding modern functionality.

• Eco-Conscious Construction: Sustainable materials, energy-efficient upgrades, and green building practices.

• Design-Build Simplicity: One team handles everything—from the first sketch to the final finish.

• Trusted by Homeowners: We’ve built our reputation on transparency, craftsmanship, and personalized service.

Your Trusted Home Addition Contractor in Berkeley

At Royalty Builders, we believe your home should evolve with your needs—without losing the charm that makes it special. Whether you’re expanding a historic home or creating a modern second story with Bay views, we’ll help you plan, design, and build an addition that’s beautiful, functional, and uniquely Berkeley.

Contact Us Today

Thinking about a home addition in Berkeley? Let’s build something incredible together. Contact Royalty Builders today to schedule your free, no-obligation consultation. We’ll walk you through your options, answer your questions, and help you turn your home addition ideas into reality.
Call us or fill out our quick contact form—we’re here to help every step of the way.

Frequently Asked Questions (FAQ) – Home Additions in Berkeley

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

• Standard Grade Construction: Approximately $171 to $342 per square foot. 

  • A 12×12 addition (144 sq. ft.) may cost between $25,000 to $49,000.​

  • A 20×20 addition (400 sq. ft.) may range from $68,000 to $137,000. ​

• 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 Berkeley?
A: Yes, obtaining a building permit is required for most construction and repair work in Berkeley, including home additions. Permits are necessary for:​berkeleyca.gov

• Construction of a new structure.​berkeleyca.gov

• Alterations to an existing structure.​

• Alterations to electrical, mechanical, plumbing, or other systems.​berkeleyca.gov

• Demolition of an existing structure.​berkeleyca.gov

The City of Berkeley provides detailed information on permit requirements and applications. Our team manages the entire permitting process to ensure your project adheres to all local codes and regulations.​berkeleyca.gov

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