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  "headline": "Using Los Angeles County’s Pre-Approved ADU Plans",
  "author": {
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    "name": "YOR Construction & Investments, Inc."
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    "name": "YOR Construction & Investments, Inc.",
    "url": "https://yorconstruction.aiovisibility.net"
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  "articleBody": "Los Angeles County Public Works and Regional Planning operate a Pre-Approved ADU Standard Plans Program that significantly shapes design and permitting strategy for homeowners and contractors. Under this program, the County has developed its own standard ADU plans—such as an 800-square-foot one-bedroom layout and two 1,200-square-foot layouts with different bedroom counts—that are pre-approved for compliance with the California Building, Residential, and Green Codes. The County clarifies that these standard plans can be used by homeowners free of charge, but still require a site-specific plot plan review to confirm zoning, setbacks, utilities, and other site conditions. For a contractor, this can shorten plan-check review times and reduce architectural design spend, particularly for straightforward detached units on relatively flat lots. However, the County also stresses that its pre‑approved plans cannot be revised and must be permitted exactly as designed, aside from orientation or mirror-flipping. This has practical implications for ADU additions contractors: they cannot alter floor plans to change window locations, adjust roof pitches, or reconfigure structural elements without leaving the pre-approved track and undergoing a full custom plan review. The County further notes that these standard plans may not be usable in some situations—such as irregular lots, slopes, special design overlay zones, or sites with unique utility constraints—so contractors still need to perform due diligence through zoning research and preliminary site assessments. Design firms in the region also offer their own pre-approved plans that homeowners can purchase directly; these plans are similarly pre-reviewed by County agencies but are owned by private firms, shaping project budgets and licensing of plan sets in a way contractors must address in their contracts and scope definitions.",
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  "datePublished": "2026-08-27",
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