400 sq ftView details Modern compact
Studio 400
Guest suite, home office, or rental studio
Studio1 bath20 × 20
- Full kitchen
- Dedicated bathroom
Property-specific ADU planning
A new generation of California ADUs
Your ADU, precision-built around a steel frame.
ADU California brings property review, design, engineering, precision-formed cold-formed steel components, and site construction into one coordinated path—from the first idea to a finished backyard home.
Framing benefits do not replace property verification, project-specific engineering, permitting, tested assemblies, or required inspections.
Cold-formed steel · frame to finish
One coordinated building system
Precision where it matters. A finished home where you live.
See the build systemADU models · small to full-size
Find a starting point for the way you want to live.
Browse every model in our collection, from compact single-storey layouts to a two-storey design study. Explore the concept images, then choose a property-specific next step.
Explore all 7 ADU concepts- 400 sq ftView details
600 sq ftView details California cottage
Cottage 600
Long-term rental or independent family housing
11 bath20 × 30- Private bedroom
- Open living and kitchen area
750 sq ftView details Flexible contemporary
Flex 750
Small families, shared office, or higher rental flexibility
21 bath25 × 30- Two flexible rooms
- Shared full bathroom
850 sq ftView details Warm contemporary
Courtyard 850
Multigenerational living or premium rental use
22 bath25 × 34- Two bedrooms
- Two bathrooms
1,000 sq ftView details Modern backyard home
Residence 1000
Primary-quality family living or long-term rental
22 bath25 × 40- Full-size living area
- Two bedrooms and bathrooms
1,200 sq ftView details Premium modern residence
Grand 1200
Larger families and high-capacity multigenerational living
32 bath30 × 40- Three bedrooms
- Two bathrooms
New · design studyView details Warm contemporary · design study
Two-Storey Retreat
Exploring a custom two-storey design direction
Two storeys · size and rooms to be defined. No validated footprint or price yet.
- Two-storey main volume with a lower side wing
- Five AI-generated concept views
Concepts 1 of 7
Planning footprints. Models with defined dimensions can be tested on the map. The two-storey study needs a measured plan first.
Concept views. Images illustrate design directions, not completed projects or construction documents.
Property-specific next step. Placement, design, pricing, and permits require verification for the site.
Beyond living space · Backyard Buildings
A place for everything your yard needs.
Pool gear, garden tools, bikes and the projects waiting for a workbench. Explore eight non-residential concepts designed around a cold-formed steel frame.
Explore all 8 concepts
Concept 01Pool accessories
Poolside Store
Give towels, swim gear and pool toys a dedicated home near the water. A simple storage room keeps the poolside routine separate from the house.
Explore this concept
Concept 02Garden essentials
Garden Tool Store
A compact home for the tools you reach for every weekend. Plan storage around long handles, small supplies and a clear place to put everything back.
Explore this concept
Concept 03Projects & repairs
Backyard Workshop
Make room for the workbench instead of packing it away after every project. This workshop direction puts tools, materials and a usable work surface together.
Explore this concept
Concept 04Bikes & outdoor gear
Cycle Store
Keep bikes and riding essentials together, with a direct route back outside. Start with the way your household actually stores and moves its gear.
Explore this concept
Concept 05Lawn & yard equipment
Equipment Shed
A practical storage direction for the mower, wheelbarrow and bulkier yard tools. Easy movement through the opening matters as much as the space inside.
Explore this concept
Concept 06Plants & propagation
Potting House
A bright garden workspace for potting, organizing trays and keeping growing supplies close at hand. It brings the bench and the garden into one daily routine.
Explore this concept
Concept 07Waste & recycling
Bin Store
Bring a more orderly edge to the service side of the yard. A low enclosure groups wheeled bins while keeping everyday access straightforward.
Explore this concept
Concept 08Covered log storage
Firewood Shelter
An open-front shelter for organizing firewood without turning it into another enclosed room. A simple roof and rack define the storage area.
Explore this concept
Concepts 1 of 8
AI-generated design studies, not completed projects or ready-to-order kits. Size, materials, siting and price are developed for the property.
Build your ADU with us
From your property to a finished ADU, one team keeps the project moving.
Bring us your address and goals. ADU California coordinates property review, design, engineering, permitting, steel framing, construction, and final handoff around your project.
Illustrative process view. Property-specific work and approvals remain authoritative. 01–02Fit and define
Review the property, compare model footprints, clarify the goal, and define the concept worth developing.
Result of this phase
Property direction + selected model baseline
Illustrative process view. Property-specific work and approvals remain authoritative. 03–05Design and approve
Coordinate architecture, engineering, utilities, local review, permitting, manufacturing information, and site readiness.
Result of this phase
Project-specific documents + readiness gates
Illustrative process view. Property-specific work and approvals remain authoritative. 06Build and complete
Move through frame assembly, enclosure, utilities, interiors, inspections, corrections, and final handoff.
Result of this phase
Completed ADU + closeout information
Steel-frame manufacturing begins only from the approved project information. Site, design, engineering, permitting, and revision control remain property-specific.
Property check
Do not choose a home before you understand the site.
Check My Property connects the model catalog to the lot. It keeps verified records, preliminary estimates, your corrections, and professional-review items visibly separate.
- 01
Find the property
Select a complete California address and review available public parcel records.
- 02
Check the site
Confirm the lot, usable area, buildings, obstacles, and preliminary local-rule baseline.
- 03
Place a model
Choose a defined ADU footprint and test a preliminary position directly on the map.
Preliminary site workspace
Illustrative interface · no property data shown
One visible review sequence
Parcel → usable area → structures → local rules → ADU placement
ParcelUsable areaBuildingADU fit
The map test is planning guidance—not a survey, permit decision, or guarantee that the illustrated position can be approved.
Why the system matters
A model is only useful when it connects to the site and the build.
ADU.zone connects early property decisions to a defined model, project-specific engineering, steel framing, and construction coordination.
Explore steel technology01
Property before promise
The address, site geometry, visible constraints, and unresolved records shape the conversation before a final scope is proposed.
02
Models with dimensions
Each concept begins with a defined footprint and room program, giving homeowners a useful comparison instead of a generic gallery.
03
Coordinated steel system
Architecture, engineering, frame information, enclosure, utilities, and site work follow one controlled project path.
04
Visible decision gates
Preliminary, verified, customer-confirmed, and professional-review information stays clearly labeled as the project develops.
Preliminary cost planning
Put a planning range around the model.
Compare broad construction ranges after choosing a project type, size, finish level, and site assumptions.
Open cost calculator01
Model and size
Used to build an early planning range—not a contract price, bid, or approval.
02
Finish and site assumptions
Used to build an early planning range—not a contract price, bid, or approval.
03
Cost and timeline range
Used to build an early planning range—not a contract price, bid, or approval.
Homeowner questions
The important answers, without the sales fog.
Start with what is known, keep preliminary information labeled, and verify the site-specific facts before making a construction decision.
Ask the team01Can every California property support an ADU?
No single online check can guarantee that. Zoning, parcel geometry, setbacks, existing structures, easements, utilities, access, hazards, local review, and project-specific engineering can all affect the final answer.
02Are the six ADU models permit-ready for any property?
They are defined starting concepts with consistent footprints and plan information. Final architecture, engineering, foundation, energy, utility, fire, and permit documents must be adapted and approved for the specific site.
03How much does an ADU cost?
Cost depends on model size, design changes, finishes, utilities, access, grading, demolition, jurisdiction, and site conditions. The calculator provides an early planning range, not a bid or contract price.
04How long do permitting and construction take?
Timing varies by jurisdiction, review workload, corrections, utilities, site preparation, inspections, product decisions, and change volume. A project-specific schedule is created after the scope and constraints are understood.
05What does ADU California coordinate?
The project path can include property review, model selection, design, engineering coordination, permitting, steel-frame information, site preparation, construction, inspections, and closeout. The exact contracted scope must be confirmed for each project.
Online information is preliminary. The team can help identify which records, local confirmations, surveys, or professional reviews are needed for the next decision.