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Expand Your Living Space with MEJA Construction's Room Additions

Room Addition Contractors for the San Francisco East Bay Area

Transform your house into your dream home with MEJA Construction, the San Francisco East Bay Area’s premier room addition contractors.


Our team of experienced professionals is dedicated to bringing your vision to life, ensuring each room addition is perfectly tailored to fit your lifestyle, needs, and aesthetic preferences.


From concept to completion, we’re with you every step of the way, offering personalized solutions and unmatched craftsmanship.

Construction Worker

Why Choose MEJA Construction for Your Room Addition Project?

  • Tailored Expertise: Our team specializes in a range of addition projects, from expansive master suites to cozy sunrooms, ensuring each addition feels like it was always part of your home.

  • End-to-End Service: We manage all aspects of your room addition, including design, engineering, permitting, construction, and finishing, making the process seamless and stress-free.

  • Commitment to Quality: With a focus on high-quality materials and attention to detail, we guarantee your addition will not only meet but exceed your expectations.

  • Clear Communication: We believe in keeping you informed and involved at every stage, providing regular updates and being available to answer any questions you might have.

  • Respect for Your Home: Our team treats your home with the utmost respect, maintaining a clean and safe work environment from start to finish.

Types of Room Additions

MEJA Construction offers a wide range of room addition options to cater to your specific needs - if you can dream it we can make it a reality! Some common room addition projects we’ve performed include:

  • Master Bedroom Suites: Expand your comfort with a luxurious master suite addition, featuring custom walk-in closets, en-suite bathrooms, and more.

  • Family Rooms: Enhance your family's living space with a spacious new family room, perfect for entertainment, relaxation, and family gatherings.

  • Home Offices: Create a productive workspace with a custom home office addition, designed to your specifications for maximum efficiency and comfort.

  • Sunrooms: Enjoy the beauty of the outdoors year-round with a sunroom addition, bringing natural light and warmth into your home.

  • Kitchen Extensions: Increase your kitchen’s size and functionality with a kitchen extension, incorporating modern appliances, custom cabinetry, and ample counter space.

  • Bathrooms: Add convenience for family members and guests with an additional bathroom, designed with high-quality fixtures and finishes.

  • In-Law Suites: Accommodate guests or provide additional living space with a fully equipped in-law suite, complete with bedroom, living area, and kitchenette.

  • Second-Story Additions: Dramatically increase your home’s square footage by adding a second story, allowing for additional bedrooms, bathrooms, and living spaces.

  • Accessible Dwelling Units (ADUs): Create independent living spaces with ADUs, perfect for rental income, guest houses, or family members requiring privacy. These standalone units can include kitchens, bathrooms, and living areas, offering a versatile addition to your property.

The MEJA Construction Process

Our proven process guarantees your room addition project is executed flawlessly, exceeding expectations and providing maximal value to you and your home:

1. Initial Consultation

We begin with a comprehensive discussion to understand your desires, budget, and the unique aspects of your property.

3. Construction

Leveraging years of experience, our construction crew works efficiently to minimize disruption while maintaining the highest standards of quality and safety.

2. Design and Planning

Our design team crafts a custom plan that aligns with your vision while our project managers ensure all necessary permits are obtained.

4. Final Walkthrough

Upon completion, we conduct a detailed walkthrough with you to ensure every aspect of the project meets your satisfaction.

Frequently Asked Questions

How long does a room addition take?

The timeline varies based on the scope and complexity of the project but we strive to complete construction for most room additions within two to four months. Second story additions typically take longer to complete, while smaller projects can often be completed sooner.

How much does a room addition typically cost?

The cost of a room addition can vary widely depending on several factors, including the size of the addition, the materials used, the complexity of the design, and the specific requirements of the project. On average, homeowners can expect to spend anywhere from $90,000 for a smaller project like a simple bedroom addition, up to $200,000 or more for larger, more complex projects like a second-story addition or a high-end master suite expansion. Accessory Dwelling Units (ADUs) can also vary in cost, typically ranging from $100,000 to $350,000, depending on the size and features included.


It's important to note that these figures are rough estimates, and the actual cost of your room addition may vary. We recommend scheduling a consultation with MEJA Construction to discuss your specific project details. We provide detailed, transparent estimates to help you understand the costs associated with your room addition project.

Will a room addition add value to my home?

Absolutely! A well-designed and constructed room addition can significantly increase your home’s market value and appeal. In-laws and ADUs also can provide a passive income stream, helping to both offset costs for you and increase the value proposition if you ever are looking to sell your home.

How do I get started?

Contact us today via the form below or at (510) 785-5140 for a free consultation. We’ll discuss your ideas, assess your needs, and outline the next steps for your room addition project.

Begin Your Home Transformation Today

Ready to enhance your living space with a custom room addition? MEJA Construction is here to bring your dreams to life. Contact us today to schedule your free consultation and take the first step towards expanding your home with confidence and style. Your dream home awaits!

Looking to do more than just one room? We can handle much more than just room additions. Our other services include:

MEJA provides services to the entire San Francisco East Bay Area. This includes the following cities: Hayward, San Leandro, San Lorenzo, Castro Valley, Union City, Fremont, Dublin, Danville, San Ramon, Pleasanton, Livermore and other surrounding cities.



We specialize in transforming your kitchen into a beautiful, functional space without breaking the bank. With our cost-effective design solutions and skilled craftsmanship, you can have the kitchen of your dreams at a price you can afford.


Experienced Designers

Our team of experienced designers brings decades of expertise to create a kitchen that perfectly suits your needs and style. Leveraging the latest design trends and technology, we transform your space into a functional, beautiful haven where memories are made.

High-Quality Materials

We take pride in using only the highest-quality materials to bring your dream kitchen to life. Our commitment to excellence ensures durability and aesthetic appeal, making your kitchen not just a cooking space, but a long-lasting investment in your home.

Modern Features

We specialize in sleek, contemporary kitchen designs that incorporate the latest in smart home technology and sustainable materials. Our approach merges form and function, turning your kitchen into a cutting-edge space that complements your modern lifestyle.


We specialize in transforming your kitchen into a beautiful, functional space without breaking the bank. With our cost-effective design solutions and skilled craftsmanship, you can have the kitchen of your dreams at a price you can afford.

Highly Functional

We focus on remodeling your kitchen to maximize its functionality without sacrificing style. Our design solutions incorporate clever storage options and ergonomic features, ensuring that every square inch of your kitchen works hard for you.



Give us a call to learn more about our kitchen remodels


1696 Trowville Lane 

Hayward, CA 94545



(510) 785-5140

Business Hours

Mon-Fri: 8am-5pm

Sat: 9am-4pm

Thank you. We'll be in touch

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