Transform Your Space with Custom ADU Solutions
Custom ADUs, Homes and Remodeling in the Bay Area
We design and build accessory dwelling units tailored to your property and lifestyle. Whether you need a rental unit, guest house, or in-law suite, Mola Construction handles everything from design and permits to construction.
Explore Our ADU Designs
Every property is different, and every homeowner has unique goals. Some clients come to us looking for a way to house aging parents close by. Others want a source of rental income to offset their mortgage. And some simply need more space for a growing family or a dedicated home office.
No matter what's driving your project, Mola Construction designs and builds ADUs that fit your specific needs. We start by understanding how you plan to use the space, then work with you to create a layout and design that makes sense for your lot, your budget, and your timeline.
Browse our designs below to see real examples of the work we do. You'll find detached units, garage conversions, and attached additions in a range of sizes and styles. Each project reflects our commitment to quality materials, smart design, and clean craftsmanship.
No matter what's driving your project, Mola Construction designs and builds ADUs that fit your specific needs. We start by understanding how you plan to use the space, then work with you to create a layout and design that makes sense for your lot, your budget, and your timeline.
Browse our designs below to see real examples of the work we do. You'll find detached units, garage conversions, and attached additions in a range of sizes and styles. Each project reflects our commitment to quality materials, smart design, and clean craftsmanship.
Laguna 1-Bedroom ADU
1
Bed
1
Bath
528
ft
Farmhouse 2-Bedroom ADU
2
Bed
1
Bath
722
ft
Open-Concept 2-Bedroom ADU
2
Bed
2
Bath
988
ft
Modern 1-Bedroom ADU
1
Bed
1
Bath
840
ft
Palm 1-Bedroom ADU
1
Bed
1
Bath
400
ft
Contemporary 2-Bedroom ADU
2
Bed
2
Bath
800
ft
Mid-Century 2-Bedroom ADU
2
Bed
2
Bath
857
ft
ADU Over 2 Car Garage in Carlsbad
2 Bed
2 Bath
980 ft
Spanish Style ADU in Rancho Santa Fe
2 Bed
2 Bath
980 ft
HOA ADU in Scripps Ranch Bay Area
2 Bed
2 Bath
980 ft
See what our customers are saying
Browse Our ADU Floor Plans
One of the most common questions we hear is "Where do I even start?" If you're not sure what size or layout makes sense for your property, our floor plan library is a great place to begin.
We've developed a collection of proven ADU designs that work well on typical Bay Area lots. These plans range from compact studio units under 400 square feet to spacious two-bedroom layouts over 1,000 square feet. Each one has been built multiple times, refined based on real-world feedback, and designed to maximize livable space without wasting square footage
.The best part? Every plan is fully customizable. Want to swap the bedroom and living room? Add a larger kitchen island? Change the exterior finishes to match your main house? No problem. Our design team will work with you to adjust any floor plan to fit your lot dimensions, your aesthetic preferences, and your budget.
Browse the options below to get a sense of what's possible. When you're ready, schedule a consultation and we'll help you figure out which plan makes the most sense for your property, or we can design something completely custom.
We've developed a collection of proven ADU designs that work well on typical Bay Area lots. These plans range from compact studio units under 400 square feet to spacious two-bedroom layouts over 1,000 square feet. Each one has been built multiple times, refined based on real-world feedback, and designed to maximize livable space without wasting square footage
.The best part? Every plan is fully customizable. Want to swap the bedroom and living room? Add a larger kitchen island? Change the exterior finishes to match your main house? No problem. Our design team will work with you to adjust any floor plan to fit your lot dimensions, your aesthetic preferences, and your budget.
Browse the options below to get a sense of what's possible. When you're ready, schedule a consultation and we'll help you figure out which plan makes the most sense for your property, or we can design something completely custom.
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1
1
528
2
1
1
722
2
2
1
988
1
1
1
840
1
1
1
400
2
2
2
800
2
2
1
857
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Create Your Dream ADU Designed Just for You
Every ADU project starts with a site evaluation. We'll visit your property, take measurements, review setback requirements, and discuss your goals. From there, we'll recommend floor plans that make sense or start designing something custom if that's the better route.
Discover a Wide Variety of ADUs
Explore our extensive library of ADUs, from compact studios to spacious family homes and minimalist retreats. If you have a custom vision, our in-house designers will collaborate with you to bring it to life. Whether modifying an existing plan or creating one from scratch, we ensure your ADU fits your property and meets city regulations. Find the perfect ADU design for your needs today!
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Frequently Asked Questions
MolaADU is your one-stop-shop for all your ADU needs. As the leading ADU builder in the Bay Area, we provide a comprehensive, turnkey solution for homeowners looking to add value and space to their property. Our expertise as an ADU contractor ensures that every detail is meticulously planned and executed, offering unmatched accountability.
What is an ADU and what are the benefits of building one?
An Accessory Dwelling Unit (ADU) is a secondary housing unit built on a single-family lot. It can increase property value, provide rental income, and offer additional space for family members. ADUs are a great way to efficiently use available land, particularly in urban areas with limited space.
How much does it cost to build an ADU in the Bay Area?
The cost to build an ADU in the Bay Area varies based on size, design, materials, and location. On average, expect to spend between $200,000 and $600,000 or more. Larger or custom designs and high-quality materials can increase the overall cost.
What are the requirements to build an ADU?
Building an ADU requires your property to be zoned for ADU construction. You must obtain the necessary permits and comply with local setback, height, and utility connection regulations. We handle the permitting process to ensure your ADU meets all local requirements.
Can I rent out my ADU?
Yes, you can rent out your ADU for rental income. However, there may be zoning laws and local rental regulations to follow, including rent control or short-term rental rules. We’ll guide you to ensure your rental complies with all local laws.
How long does it take to build an ADU?
The timeline for building an ADU typically ranges from 6 to 12 months, depending on design complexity, permits, and construction. Permitting can take several weeks or months, and construction usually takes 3 to 6 months once approved.
Trusted Locally. Built for the Bay Area.
Based in California, Mola Construction & ADU proudly serves homeowners across the Bay Area with expert ADU design and construction services.
Our central location allows us to efficiently support projects in Santa Clara County and surrounding communities.We are familiar with local zoning requirements, permit processes, and Bay Area building codes — helping you avoid delays and move from planning to construction faster and smoother.Whether you’re building a backyard ADU, garage conversion, or a detached unit, our team offers end-to-end solutions tailored to Sunnyvale and neighboring cities.
Our central location allows us to efficiently support projects in Santa Clara County and surrounding communities.We are familiar with local zoning requirements, permit processes, and Bay Area building codes — helping you avoid delays and move from planning to construction faster and smoother.Whether you’re building a backyard ADU, garage conversion, or a detached unit, our team offers end-to-end solutions tailored to Sunnyvale and neighboring cities.
Contact us
Get in touch with our team to start your ADU project. Whether you have questions about what's possible on your property or you're ready to begin the design process, we're here to help. Fill out the form and tell us about your goals.
We'll review your property, put together a cost estimate, and walk you through what comes next. Consultations are always free with no obligation.
We'll review your property, put together a cost estimate, and walk you through what comes next. Consultations are always free with no obligation.
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