Attached ADU Builder in Los Angeles
Expand your home with a private, self-contained living space designed as a seamless architectural extension. AXMIS Construction designs and builds custom attached ADUs throughout Los Angeles, the South Bay, and the Westside—coordinating the connection to your existing home, permits, structural work, utilities, interiors, and final inspections.
What Is an Attached ADU?
An attached accessory dwelling unit is an independent residence physically connected to the primary home. It may share one or more walls with the existing structure while maintaining its own entrance, kitchen, bathroom, living area, and sleeping space.
Attached ADUs are often considered when homeowners want to expand usable square footage while preserving more of the yard. The new residence can be designed beside the house, toward the rear, or as part of a carefully planned extension.
Every project begins with an evaluation of the existing foundation, framing, roof, utilities, interior circulation, privacy, and the proposed structural connection between the original home and the ADU.
Custom Planned
Designed Around the Property
Full-Service
Preconstruction Through Completion
LA Based
South Bay and Westside Projects
The right ADU for the property
AXMIS evaluates the existing lot, structures, access and intended use before determining the most practical direction.
ADU Design & Permitting
Ground-up homes shaped around your site, architecture, and way of living. Ground-up homes shaped around your site, architecture, and way of living.
Attached ADUs
Ground-up homes shaped around your site, architecture, and way of living. Ground-up homes shaped around your site, architecture, and way of living.
Detached ADUs
Ground-up homes shaped around your site, architecture, and way of living. Ground-up homes shaped around your site, architecture, and way of living.
Garage Conversion ADUs
Ground-up homes shaped around your site, architecture, and way of living. Ground-up homes shaped around your site, architecture, and way of living.
Junior ADUs
Ground-up homes shaped around your site, architecture, and way of living. Ground-up homes shaped around your site, architecture, and way of living.
Turnkey ADU Construction
Ground-up homes shaped around your site, architecture, and way of living. Ground-up homes shaped around your site, architecture, and way of living.
Every square foot has to work harder
Property Feasibility
The lot, existing structures, access, setbacks, utilities and likely construction constraints are reviewed before the project advances.
Design Coordination
Architecture, engineering and consultants are aligned around a single buildable plan before permitting begins.
Utility Coordination
Electrical, plumbing, sewer, water, HVAC and site connections are assessed as part of early constructability planning.
Transparent Budgeting
Scope, allowances, selections and assumptions are documented so the owner can understand the budget before field work begins.
Our process,
step by step
- Site protection and layout
- Grading and excavation
- On-site utility trenching
- Under-slab plumbing
- Footings, rebar and slab
- Wall and roof framing
- Sheathing and hardware
- Roofing and waterproofing
- Windows and exterior doors
- Exterior cladding
- Plumbing rough-in
- Electrical rough-in
- HVAC installation
- Rough inspections
- Insulation and air sealing
- Drywall and paint preparation
- Cabinets and countertops
- Tile and flooring
- Interior doors and trim
- Interior painting
- Fixtures and appliances
- Finish plumbing and electrical
- Touch-ups and punch list
- Final inspections
- Cleaning and handover
One structure.
Multiple possibilities
The best layout and specifications depend on who will use the ADU now and how the property may need to adapt in the future.
Multigenerational Living
Private, nearby space for parents, adult children or extended family with independent living functions.
Guest Residence
A comfortable place for visitors that preserves privacy for both the guests and the main household.
Work & Creative Space
A quiet studio, office or flexible workspace separated from daily activity inside the primary residence.
Long-Term Flexibility
Additional living space that can evolve as household needs, work patterns and family arrangements change.
Property Improvement
Thoughtfully designed square footage that can improve the usefulness and long-term appeal of the property.
Independent Living
A complete residence with its own kitchen, bathroom, sleeping area, mechanical systems and entrance.
Before Building an Attached ADU
Building in Los Angeles requires a coordinated understanding of the property, local standards, structure requirements, utility and construction elements. AXMIS Construction manages general contractors in the South Bay, LA market and focuses on Los Angeles, where custom homes and ADU-oriented projects demand a more focused, thorough build.
Can I add an attached ADU to my existing home?
Many Los Angeles homes may support an attached ADU, but feasibility depends on available lot area, the existing structure, setbacks, utilities, access, and current requirements. AXMIS begins with a property and building evaluation.
Does an attached ADU need a separate entrance?
An attached ADU is planned as an independent residence and typically includes its own exterior entrance together with a kitchen, bathroom, living area, and sleeping space.
How large can my attached ADU be?
The possible floor area depends on state and local standards, the proposed number of bedrooms, the existing house, lot conditions, height limitations, and the approved design.
How much does an attached ADU cost in Los Angeles?
Cost depends on size, structural tie-in, selective demolition, roof integration, utilities, finish level, permit requirements, access, and protection of the occupied home during construction.
Can an attached ADU share utilities with the main house?
Utility systems may connect to existing property infrastructure when capacity and applicable requirements allow. Electrical, water, sewer, HVAC, and water heating are evaluated during preconstruction.
Built for the way you want to live
From a ground-up residence to a transformative remodel, every project receives the same rigorous planning and field oversight.
ADU / Service Areas
Before starting an ADU project
The new foundation, walls, and roof must connect properly to an existing building. Structural movement, water protection, utility routes, finishes, and construction around an occupied home all require careful coordination.
Yes. Roof pitch, siding, stucco, windows, trim, colors, and proportions can be coordinated so the addition feels intentional rather than added later.
Yes. We review the connection details, constructability, structural plans, utilities, specifications, scope, budget assumptions, and permit status before construction.
