Feb 20, 2026
Adu Design San Marino, CA
Turn your property into a more flexible, functional space with custom ADU solutions built around your goals. Uni Construction + ADU Design helps homeowners and property owners in San Marino with ADU plans, design, permits, and construction support from start to finish.
Whether you are planning a detached backyard unit, an attached ADU, a junior ADU, or a garage conversion, our team focuses on practical planning, clear communication, and a smooth path to a finished space. Call (213) 306-5601 today to request your Free Quote.
Get a Free QuoteCall 213-306-5601
Since 2014
Custom ADU solutions
Design-build support
Residential and commercial
San Marino, CA service area
Proudly Serving San Marino Neighborhoods
Uni Construction + ADU Design proudly serves property owners throughout San Marino, including key areas where homeowners and business property owners may be planning ADU improvements, garage conversions, and custom design-build projects.
We serve
- Huntington Drive West commercial area
- Mission Street business area
- Lacy Park area
- Crowell Public Library
- San Marino City Hall
- The Old Mill (El Molino Viejo)
If your property is in San Marino or nearby, our team can help you explore the right ADU direction for your lot, goals, and project type.
Custom ADU Builder and Contractor Services in San Marino
If you are looking for an ADU builder in San Marino, you need more than a contractor who can only handle one part of the project. You need a team that understands how the design, layout, permit process, and construction phase all connect.
Uni Construction + ADU Design offers a direct, practical approach for property owners who want a clear plan and a finished ADU that fits the property well. Our work is built around real use cases, from extra living space for family to guest accommodations, rental potential, work-from-home flexibility, and better use of underused garage or backyard space.
ADU design, plans, permits, and build support
A successful ADU project starts with the right planning. We help guide projects through the early design phase, ADU plans, layout decisions, permit coordination, and the build process so your project moves forward with more clarity and fewer surprises.
Instead of treating design and construction like separate disconnected steps, we focus on the full picture. That helps create a more efficient process and a space that works better for how you want to use it.
Built for San Marino homeowners and property owners
San Marino properties often call for thoughtful planning, clean design direction, and a finished result that feels appropriate for the home and surrounding setting. Our approach stays practical, local, and tailored to the goals of the property owner rather than forcing one standard formula onto every project.
Whether the property is residential or connected to a commercial need, we build around the site, the use case, and the long-term value of the space.
Why ADUs Make Sense for San Marino Properties
In a city like San Marino, adding functional space without leaving your property can be a smart long-term move. An ADU gives you flexibility while making better use of the land you already have.
With Southern California’s mild weather and year-round usability, detached backyard units, attached ADUs, and garage conversion projects can become comfortable, practical living spaces that support everyday needs. Whether the goal is housing for family, space for guests, a private office, or an independent unit with rental potential, an ADU can add real usefulness to the property.
Extra living space without leaving your property
One of the biggest advantages of an ADU is the ability to create more room without the disruption of moving. You can add a separate area for living, sleeping, working, or hosting while keeping the main home intact.
That makes ADUs especially attractive for growing families, multi-generational households, or property owners who want more independence and flexibility from the space they already own.
A practical option for family, guests, or rental use
ADUs work well for many different needs. Some property owners want a private area for parents, adult children, or long-term guests. Others want a more functional layout for work, creative use, or rental income.
The right design depends on how the unit will be used. That is why the planning stage matters so much. A good ADU should feel intentional, efficient, and aligned with the property rather than added as an afterthought.
ADU Options We Build in San Marino
Detached ADU
A detached ADU is a separate unit built apart from the main home. This option is often ideal for backyard projects where privacy, independent access, and flexibility are a priority. Detached ADUs are commonly used for family living space, guest accommodations, rental use, or a private home office setup. They also allow more freedom in layout and separation from the main residence.
Attached ADU
An attached ADU is connected to the main structure while still functioning as a separate living area. This can be a smart solution when the property layout supports an addition that feels integrated and efficient. Attached ADUs can work well for homeowners who want added living space without building a fully separate structure in the yard. They also create an opportunity to expand the usable footprint of the property in a way that feels cohesive.
Junior ADU
A Junior ADU is a smaller ADU option that can make practical use of existing space within the home. For some property owners, this is a more efficient way to add flexibility without pursuing a larger detached or attached unit. Junior ADUs can be a good fit for compact living arrangements, family use, or additional privacy within the existing structure.
Garage Conversion
A garage conversion can be one of the most efficient ways to create an ADU when the structure is already in place. Instead of leaving the space underused, you can turn it into a more functional area for living, working, or hosting. Garage conversion ADU projects are popular because they can make smart use of the property footprint while creating a comfortable, valuable space with the right design and build approach.
Modular ADU
For property owners exploring modular ADU options, the focus is still the same: practical use of space, efficient planning, and a finished result that fits the property well. A modular ADU may be the right direction depending on project goals, layout needs, and site conditions. We help guide that conversation so the approach matches the property rather than the other way around.
Custom ADU plans and floor plans
Every property has different constraints and opportunities. Custom ADU plans allow the layout, room flow, access, and overall design to reflect the intended use of the space. Whether you are looking for ADU floor plans for a small detached unit, a garage conversion layout, or a more customized design concept, the planning stage is where the project starts becoming real. Strong floor planning can improve comfort, usability, circulation, and long-term value.
Why Choose Uni Construction + ADU Design
Choosing the right ADU contractor is not only about construction. It is also about how clearly the project is handled from the beginning, how well the design fits the property, and how confident you feel throughout the process.
Uni Construction + ADU Design keeps the approach direct, professional, and focused on custom solutions that fit real property needs.
Serving San Marino since 2014
Experience matters when planning an ADU project with multiple moving parts. Since 2014, Uni Construction + ADU Design has provided custom solutions with a focus on practical project execution and service that stays grounded in the client’s actual goals. That experience helps shape better planning conversations, more useful design direction, and a more organized path from idea to finished result.
Custom ADU solutions for residential and commercial properties
Not every ADU project starts from the same need. Some clients want more living space at home. Others want a more strategic use of property for professional or long-term value reasons. Our custom ADU solutions are designed around the property, the intended use, and the priorities of the owner. That makes the final result feel more functional and more purposeful.
A direct design-and-build approach from start to finish
Projects move better when there is a clear connection between planning and execution. Our design-and-build approach helps keep the process more unified, so important decisions about layout, permits, and construction stay aligned. That creates a smoother experience for the client and makes it easier to move from consultation to completed ADU with confidence.
Our ADU Process: Plan, Design, Permit, Build
An ADU project becomes easier to move forward with when the process is clear. We break the work into straightforward stages so you know what comes next and what each phase is meant to accomplish.
Project consultation
The first step is understanding your property, goals, and preferred type of ADU. We start with a conversation about how you want to use the space, what type of unit you are considering, and what direction may fit the site best. This stage helps define the project before deeper planning begins. It is also the right time to ask questions and request your free quote.
ADU design and planning
Once the project direction is clear, the design and planning phase focuses on layout, functionality, and how the ADU should work in relation to the property. This is where ADU designs, floor plans, and use-case decisions start taking shape. Good planning helps avoid confusion later. It also improves the chances that the final space will feel practical, comfortable, and well organized.
Permit coordination
Permits are a key part of moving an ADU project forward. This stage involves coordinating the planning and documentation needed to support the approval path for the project. For many property owners, this is one of the most stressful parts of the process. Having permit support built into the project flow helps keep things more manageable and easier to understand.
Construction and completion
Once planning and permit steps are in place, the construction phase moves the ADU from concept to built space. The goal is not only to complete the project, but to complete it in a way that stays aligned with the original vision and intended use. By the end of this phase, the ADU should feel like a natural, useful extension of the property rather than a disconnected add-on.
ADU Design Ideas for Backyard and Garage Conversion Projects
Detached backyard ADU concepts
A detached backyard ADU can be designed for privacy, comfort, and efficient use of the lot. These units often work well as guest space, independent living quarters, or a dedicated home office setup. Clean layout planning, natural light, storage, and efficient circulation all matter here. Even a smaller detached ADU can feel open and highly functional when the space is designed well.
Attached and garage conversion layouts
Attached ADUs and garage conversion layouts often benefit from thoughtful integration with the existing property. The best results come from designing the new space so it feels purposeful, balanced, and easy to use. Layout choices can influence privacy, access, flow, and how comfortably the ADU works for long-term use. This is where design planning has a major impact on the finished experience.
Custom finishes and practical space planning
Custom ADU projects do not need to feel oversized to be effective. A small ADU can still deliver strong everyday function when the layout is efficient and the finishes are chosen with purpose. For property owners interested in a modern ADU feel, clean lines, practical materials, and well-planned room flow can help the unit feel polished without overcomplicating the design.
What Affects ADU Project Cost in San Marino?
ADU pricing depends on the details of the project. Rather than relying on broad one-size-fits-all numbers, it is more useful to understand what drives the scope and complexity of the work.
A custom quote gives the clearest picture, but several factors usually play a major role in shaping the cost of an ADU project.
Size, layout, and ADU type
The size of the unit, the number of rooms, and the overall layout all influence the project scope. A detached ADU, attached ADU, junior ADU, and garage conversion each come with different planning and construction considerations. The more customized the floor plan and layout, the more important it becomes to evaluate the project as a whole rather than using a generic estimate.
Site conditions and permit requirements
Every property presents different site conditions. Access, existing structures, lot setup, and permit-related requirements can all affect the planning process and overall project demands. That is why an early property-specific review is so important. It helps shape a quote that reflects the real project instead of a rough guess.
Custom design and build scope
Design complexity, desired finishes, and the overall scope of work all contribute to the final cost. A more custom project may involve more detailed planning and a broader build scope. The best next step is to request a free quote so the project can be discussed in the context of your actual property, goals, and preferred ADU type.
Frequently Asked Questions About ADU Services in San Marino
We help with a range of ADU options, including detached ADUs, attached ADUs, Junior ADUs, garage conversions, modular ADUs, and custom ADU layouts designed around the property.
Yes. Our process includes support for ADU plans, design direction, and permit coordination so the project has a clearer path from planning to construction.
Yes. We work with both detached and attached ADU projects depending on the property layout, intended use, and overall goals for the space.
Yes. Garage conversion projects are one of the practical ways to create more usable living space from an existing structure. The right approach depends on the current setup and your goals for the finished unit.
ADU cost is influenced by the unit type, size, layout, site conditions, permit requirements, and the level of customization in the design and build scope.
You can call (213) 306-5601 to speak with Uni Construction + ADU Design and request a free quote for your San Marino ADU project.
Get a Free Quote for Adu Design San Marino?
If you are ready to explore a detached ADU, attached ADU, Junior ADU, garage conversion, or custom ADU plan, Uni Construction + ADU Design is ready to help. We work with San Marino property owners who want a clear process, practical design support, and a finished ADU built around how the space will actually be used.
Call (213) 306-5601 today to request your Free Quote and start planning your next ADU project in San Marino.
