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San Diego Licensed ADU Contractor

Building affordable living with increase revenue for San Diego homeowners

Spacious backyard ADU built in San Diego.
Blueprints for a San Diego accessory dwelling unit.

General Construction Contractor.

Looking to expand your living space or build your dream home? Our licensed and insured team specializes in custom homes, ADU construction, and full-scale renovations. Affordable, reliable, and tailored solutions for San Diego homeowners.

ADU Licensed Contractor

California Assembly Bill AB-68 passed to help ease the San Diego housing crisis by making it easier for homeowners to build Accessory Dwelling Units (ADUs).

Detached ADU with a private entrance and patio.
Home Builders.

Build your dream home with expert house constractor services in San Diego. Our licensed and insured team specializes in crafting custom homes tailored to your lifestyle. From modern designs to timeless architecture, we handle everything—from planning and permits to final construction. Enjoy top-quality materials, impeccable craftsmanship, and on-time project delivery.

Detached ADU with a private entrance and patio.
Home Remodeling.

Revitalize your home with professional remodeling services in San Diego. Whether you’re updating a kitchen, transforming a bathroom, or reimagining your living space, our licensed contractors ensure a seamless process. We focus on enhancing functionality, style, and value, delivering exceptional craftsmanship and personalized designs.

Detached ADU with a private entrance and patio.
ADU (Accessory Dwelling Units).

Expand your living space with expertly designed and built ADUs in San Diego. Our team specializes in creating beautiful, functional accessory dwelling units for rental income, guest houses, or private offices. From concept to completion, we manage the entire process, including design, permits, and construction. Licensed and insured, we guarantee precision, compliance, and lasting quality.

Energy-efficient windows installed in a new ADU.
House Improvements.

Upgrade your property with professional construction improvement services in San Diego. From structural enhancements and outdoor features to energy-efficient solutions, we provide tailored upgrades to meet your needs. Our licensed and insured contractors specialize in improving safety, aesthetics, and functionality while increasing your property value.

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Energy-efficient windows installed in a new ADU.
Stylish bathroom in a recently completed ADU.
Garage conversion ADU with modern finishes.

ADU Construction Process

Expand Your Space. Elevate Your Life. ONE PHASE

Team of builders constructing a San Diego ADU.
01
Planning and Feasibility
This includes reviewing your lot size, zoning regulations, and existing structures. Homeowners should consider their goals for the ADU—whether it’s for rental income, multi-generational living, or increased property value.
02
Design and Architectural Plans
Homeowners typically work with an architect or design-build firm to create a layout that meets their functional needs and complies with San Diego’s building codes. ADUs can be detached, attached, garage conversions, or internal units within the main home.
03
Permitting and Approval
This includes submitting site plans, structural, and Title 24 energy reports. The city of San Diego reviews the submission for zoning compliance, safety codes, and environmental considerations. The city offers an expedited process for ADUs, often issuing approvals in a shorter times.
04
Construction and Inspections
This phase includes site preparation, foundation work, framing, roofing, insulation, plumbing, electrical, HVAC, and interior finishes. City inspectors will visit the site at various stages and final inspection—to ensure everything is built to code.

Clients Testimonials

Read what our clients have to say about our work.

Small but functional ADU kitchen layout.
"ONE PHASE Inc. turned my vision of a room addition into a reality, and I'm thrilled with the outcome. The team was not only skilled and efficient but also considerate of my preferences and budget."
Carlos V
Chula Vista, CA
"ONE PHASE Inc. turned my vision of a room addition into a reality, and I'm thrilled with the outcome. The team was not only skilled and efficient but also considerate of my preferences and budget."
Aaron R.
San Diego, CA
"An absolute dream! From start to finish, their team was professional, communicative, and incredibly detail-oriented. We hired them for a full kitchen and bathroom remodel in our San Diego home, and the results exceeded our expectations. The craftsmanship was impeccable, and they delivered the project on time and within budget."
Abraham G.
San Diego, CA
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General Construction Contractor

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