Garage Conversion ADUs in Los Angeles
Onyx General Construction converts underused garages into highly functional, code-compliant Accessory Dwelling Units that add livable space and long-term value in Los Angeles.
A garage conversion ADU offers one of the fastest and most cost-effective paths to increasing livable space in Los Angeles. Many homeowners have garages that no longer serve their original purpose—outdated framing, weather exposure, limited storage function, or placement that no longer matches modern needs. Converting these structures into a conditioned, rentable, and fully permitted living environment provides measurable value through additional square footage, improved usability, and rental income potential.
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Every site in Los Angeles is unique—lot size, access, zoning overlays, utilities, and structural conditions all influence the feasibility of a conversion. At Onyx, we study these constraints early to create a conversion strategy that respects site lines, privacy concerns, electrical routing, sewer access, and circulation. Whether the goal is a private suite, a home office, a family extension, or a rentable ADU, each design is calibrated to maximize function, comfort, and long-term durability.
Converting a garage into a legal ADU requires disciplined sequencing and knowledge of Los Angeles permitting rules. We begin with a technical site evaluation, followed by architectural layout design that satisfies state ADU mandates and local zoning constraints. Our team coordinates structural engineering, Title 24 energy modeling, and complete LADBS submissions. Once approved, the build progresses through demolition, foundation reinforcement, framing corrections, rough utilities, insulation, waterproofing, and full interior finishes.
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Costs vary depending on structural upgrades, utility distances, roofing conditions, electrical capacity, slab condition, and finish level. Our feasibility review clarifies these variables early so homeowners gain a realistic understanding of total project scope.
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Garage ADUs require significant upgrades compared to standard garages. Existing slabs often need leveling, waterproof membranes, vapor barriers, and new footings. We correct outdated electrical, replace compromised framing, install modern plumbing systems, and integrate insulation to exceed California’s energy code. Windows, roofing, exterior finishes, and mechanical systems are installed to the same performance standards used in new homes.
We understand how important timeline reliability is in Los Angeles. Our construction schedules are structured to limit downtime between trades and maintain clean progression through inspections. Rough utilities, framing adjustments, and insulation are coordinated tightly to avoid rework. Finishes are sequenced with precision so the build moves efficiently without sacrificing detail.
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Garage ADUs require new plumbing lines, sewer connections, upgraded electrical service, and mechanical routing. We design utility paths that minimize invasive trenching, avoid unnecessary concrete cuts, and maintain clean slope for sewer line compliance. Electrical load calculations determine panel upgrades when required. HVAC strategies are selected based on efficiency, wall height, duct routing, and acoustic isolation.
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ADUs in Los Angeles must meet statewide requirements while also satisfying local conditions such as setbacks, fire separation, egress, and energy compliance. Onyx manages all LADBS communication—plan check corrections, structural revisions, field inspector coordination, and required documentation. Our familiarity with ADU regulations allows us to streamline approvals and reduce back-and-forth with city departments.
Garage conversions offer one of the strongest value propositions for Los Angeles homeowners. Their small footprint, reduced site work, and existing structure allow for efficient construction, faster approvals, and strong long-term returns.
Communication and clarity are embedded into our workflow. Homeowners receive consistent updates, material selection guidance, and transparent coordination throughout the build. We remain accessible from the initial feasibility study through the final inspection and handoff, ensuring homeowners feel supported and informed.
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If you’re considering a garage conversion ADU, we can help you evaluate feasibility, design options, and realistic costs. Contact us to schedule a consultation and begin planning your project with a design-driven and construction-focused team.
