Feb 20, 2026
Adu Design Altadena, CA
Turn underused space into a practical, well-designed ADU with a team that can guide your project from concept to build-ready planning. Uni Construction + ADU Design helps Altadena homeowners and property owners with ADU plans, permit support, custom layouts, and design-build coordination for detached ADUs, attached ADUs, junior ADUs, garage conversions, and modular ADU projects.
Get a Free QuoteCall 213-306-5601
Since 2014
Custom ADU solutions
Design-build support
Residential and commercial
Altadena, CA service area
Proudly Serving Altadena Neighborhoods
If you need more room, moving is not your only option. A well-planned ADU can add flexible living space right on your existing property. That can mean a private area for family, a guest space, a work-from-home setup, or a more useful backyard layout.
Custom ADU Builder and Contractor Services in Altadena
If you are looking for a reliable ADU builder and contractor in Altadena, the most important thing is having a team that can handle the full scope of the project. ADU work is not just about drawing plans or building walls. It requires smart design, practical planning, permit coordination, and a construction approach that fits the property.
Uni Construction + ADU Design offers ADU services built around real project needs. We help clients in Altadena plan the right type of accessory dwelling unit for the lot, the layout, and the intended use, then carry the project forward with a streamlined design and build process.
ADU design, plans, permits, and build support
A good ADU project starts long before construction. It starts with smart planning, a layout that fits your property, and a clear path through design, permitting, and build preparation. That is where we come in.
At Uni Construction + ADU Design, we help you move from idea to action with practical ADU services tailored to your lot, goals, and budget. Whether you are planning a detached backyard unit, an attached addition, a junior ADU, or a garage conversion, we focus on clear planning and usable design from day one.
Built for Altadena homeowners and property owners
Altadena is an unincorporated Los Angeles County community just north of Pasadena, with a foothill setting and easy access to open space like Eaton Canyon. That local setting shapes how homeowners think about space, privacy, access, and how an ADU should fit into the property.
With Altadena’s generally warm, dry seasons and usable outdoor living patterns through much of the year, many property owners want ADU designs that feel practical, comfortable, and well connected to the rest of the home.
Why ADUs Make Sense for Altadena Properties
Altadena homeowners often want more usable space without giving up the location they already value. A well-planned ADU can create that flexibility while making better use of the property you already own.
In a city like Altadena, where homeowners want practical living space that fits established neighborhoods and day-to-day residential needs, ADUs are a smart solution.
A practical option for family, guests, or rental use
Many property owners look at ADUs because they want more flexibility. Some want room for parents or adult children. Some want to turn a garage into something more useful. Others want a small ADU that supports long-term property value and day-to-day function. The right design depends on how you want the space to work, not just how much square footage you can add.
ADU Options We Build in Altadena
Detached ADU
A detached ADU is a strong choice when you want a separate living area with more privacy and a clearer sense of independence. These are popular for backyard projects, guest use, extended family living, or rental flexibility.
Attached ADU
An attached ADU connects to the main home while still creating a distinct living space. This option can work well when the lot layout supports an addition and you want a more integrated design.
Junior ADU
A junior ADU can be a smart fit when you want to make better use of existing interior space. It works especially well for smaller-scale projects where efficient planning matters more than starting from scratch.
Garage Conversion
A garage conversion can be one of the most practical ways to create usable space without expanding the footprint too much. If your garage is underused, converting it into an ADU may offer a faster path to a more functional property.
Modular ADU
For some properties, a modular ADU can be worth exploring as part of the planning conversation. The best choice depends on your site conditions, layout goals, and how customized the finished space needs to be.
Custom ADU plans and floor plans
No two properties work the same way. That is why we focus on custom ADU plans and floor plans that reflect the lot, circulation, privacy needs, and how you actually want to use the space. A strong plan upfront can save time, reduce confusion, and make the full project smoother.
Why Choose Uni Construction + ADU Design
Choosing the right ADU company means choosing a team that understands how to move a project from idea to finished build without making the process harder than it needs to be.
Serving Altadena since 2014
Experience matters in ADU planning because these projects involve more than design alone. They require coordination, practical thinking, and a clear understanding of what needs to happen before construction begins.
Custom ADU solutions for residential and commercial properties
We do not force every property into the same template. We look at the goals, the layout, and the type of ADU that makes the most sense for the space. That leads to better decisions and a more useful end result.
A direct design-and-build approach from start to finish
You should not have to manage disconnected teams and guess your way through the process. Our approach is built around clear communication, coordinated planning, and helping you move through the project with fewer surprises.
Our ADU Process: Plan, Design, Permit, Build
A clear process makes the entire project easier to understand. It also helps reduce delays, confusion, and misalignment along the way.
Project consultation
We start by understanding your property, your goals, and the kind of ADU you want to build. This helps define the right direction early.
ADU design and planning
Next comes the design phase, where we shape the layout, floor plan, and overall approach based on your property and priorities. This is where smart decisions create a better project.
Permit coordination
Permitting can slow a project down when the planning is weak. We help support the permit path by making sure the project is organized clearly and prepared properly.
Construction and completion
Once the planning and permit side is in place, the project moves into build execution. The goal is simple: a well-designed ADU that is practical, efficient, and ready to serve the purpose you built it for.
ADU Design Ideas for Backyard and Garage Conversion Projects
Detached backyard ADU concepts
Backyard ADUs work best when they feel intentional, not squeezed in. Good design looks at privacy, light, access, storage, and how the new unit sits on the property.
Attached and garage conversion layouts
Attached ADUs and garage conversions need careful space planning so the finished unit feels complete, comfortable, and easy to use. Layout matters just as much as square footage.
Custom finishes and practical space planning
The best ADU designs are not just attractive. They are usable. That means thoughtful kitchens, efficient bathrooms, strong storage choices, and floor plans that make small or modern ADUs feel bigger and more comfortable.
What Affects ADU Project Cost in Altadena?
Every ADU project is different, which means pricing depends on more than one factor. Rather than using generic numbers that do not reflect the property or the scope, it is better to look at the project based on the real conditions involved.
Size, layout, and ADU type
A detached ADU, attached ADU, junior ADU, and garage conversion do not carry the same design and construction demands. The type of ADU you choose has a direct effect on scope.
Site conditions and permit requirements
Property layout, access, existing structures, and permit-related requirements can all affect how simple or complex the project becomes
Custom design and build scope
The more custom the design, the more the details matter. Materials, layout decisions, utility planning, and overall finish level all shape the final project cost. The best way to get a useful number is with a project-specific quote, not a generic estimate pulled from somewhere else.
Frequently Asked Questions About ADU Services in Altadena
We help with detached ADUs, attached ADUs, junior ADUs, garage conversions, modular ADU options, and custom ADU layouts based on the property.
Yes. We help guide the planning side of the project, including ADU plans, layout direction, and permit support so the process is more organized from the beginning.
Yes. We work with both detached and attached ADU concepts depending on the lot, the layout, and how you want the space to function.
Yes. Garage conversions are one of the most practical ways to create additional living space when the existing structure makes sense for conversion.
The biggest factors usually include ADU type, size, layout complexity, site conditions, permit requirements, and how custom the finished scope will be.
You can call (213) 306-5601 or use the quote form on the page. We will learn more about your property, your goals, and the type of ADU you are considering.
Get a Free Quote for Adu Design in Altadena
Whether you are planning a detached ADU, attached ADU, junior ADU, garage conversion, or custom floor plan, Uni Construction + ADU Design is ready to help you take the next step.
If you want a practical ADU design strategy that fits your property and gives you a clear path forward, reach out today.
