ADU Construction in Los Angeles & Southern California
Build a high-quality Accessory Dwelling Unit (ADU)—detached, attached, or garage conversion—with clear scope, clean execution, and inspection-ready workmanship.
What is an ADU?
An Accessory Dwelling Unit (ADU) is a secondary living space on the same lot as a primary home—often used for rental income, family living, guest space, or a dedicated home office. ADU rules and permitting pathways vary by city, but California has statewide guidance and ongoing updates that influence what local agencies can require.
Suncore Engineering and Construction supports ADU builds across Los Angeles and Southern California—from site prep and concrete to interior buildouts and coordination that helps your project move through inspections.
What We Do
We help homeowners and property owners build, convert, or expand ADU spaces so you end up with a functional, code-ready unit that’s built correctly and ready for finishes, utilities, and final approvals. Our work focuses on the physical construction that makes your ADU possible—foundations, slabs, framing readiness, secure buildouts, and jobsite coordination.
ADU Types We Build
Detached ADU (Backyard ADU)
A standalone unit—great for rental income, privacy, or a separate family living space.
Garage Conversion ADU
Convert an existing garage into a legal living space with upgraded structure, insulation, openings, and layout.
Attached ADU / Addition-Style ADU
A new unit connected to the main home, often designed as an addition with separate access.
JADU (Junior ADU)
A smaller, internal option in some jurisdictions (rules vary). We can guide you through feasibility during your walkthrough.
ADU Construction Services We Provide
Site Prep & Civil Support
Site readiness, grading coordination (as needed), trenching coordination, and practical preparation for utilities and access.
Concrete & Foundations
Footings, slabs, reinforcement readiness, equipment pads, and foundation work built to approved plans and inspection requirements.
Framing & Structural Readiness
Build-phase support for framing and structural integration—focused on clean execution and inspection readiness.
Interior Buildouts (Fit-Out Support)
Partitions, doors, openings, basic buildout scopes, and space preparation for MEP trades and finishes.
Project Coordination & Permit Support
Scheduling alignment, trade coordination support, and permit/inspection readiness (often in collaboration with your designer/engineer of record).
Clear Scope & Schedule
We build a clear scope, define responsibilities by trade, and set a practical schedule with milestone checkpoints—so your ADU project stays organized, inspection-ready, and predictable.
Why Build an ADU?
Common Reasons Homeowners Build ADUs
Homeowners typically build ADUs to create rental income, house extended family, add property value, or create flexible space like an office or guest unit—without moving.
Why Suncore Engineering and Construction
We bring an engineering-minded construction approach that prioritizes buildability, sequencing, and inspection readiness. Our teams are field-proven in concrete, site work, and buildouts, and we coordinate clearly so ADU projects don’t stall from avoidable rework.
Frequently Asked Questions
Do you handle detached ADUs and garage conversion ADUs?
Yes—our team supports detached ADU construction and garage conversion buildouts, depending on site conditions and project scope.
Can you help with permitting?
We often support the permitting process by coordinating construction documentation and inspection readiness with your design team and local requirements. Some cities also offer standard/pre-approved plan options that can help streamline approvals.
How long does an ADU build take?
It depends on scope, permitting timelines, long-lead items, and utility coordination. After a walkthrough, we can provide a schedule range and recommend phasing.
What’s the biggest cause of delays?
Common delays come from permitting cycles and utility coordination. Planning early and locking scope helps reduce surprises.
Do rules differ by city?
Yes—local requirements vary, while California also issues statewide guidance and updates that influence local rules.