{"id":314,"date":"2025-08-23T06:15:37","date_gmt":"2025-08-23T06:15:37","guid":{"rendered":"https:\/\/bimtraining.institute\/blog\/?p=314"},"modified":"2025-08-23T06:15:38","modified_gmt":"2025-08-23T06:15:38","slug":"what-is-lod-and-loi-in-bim","status":"publish","type":"post","link":"https:\/\/bimtraining.institute\/blog\/what-is-lod-and-loi-in-bim\/","title":{"rendered":"What Is LOD and LOI in BIM?"},"content":{"rendered":"\n

A complete, plain-English guide to Levels of Development\/Detail & Levels of Information<\/em><\/p>\n\n\n\n

Building Information Modeling (BIM) only delivers real value when everyone agrees how detailed<\/strong> the model needs to be and what information<\/strong> each element must contain\u2014at each stage<\/strong> of a project. That\u2019s exactly what LOD<\/strong> and LOI<\/strong> solve.<\/p>\n\n\n\n

\"What<\/figure>\n\n\n\n

This guide explains what LOD and LOI mean, how different standards use them, the practical differences between the two, and how to specify them on real projects (with examples and a ready-to-copy checklist).<\/p>\n\n\n\n

\n\n\n\n

Quick definitions (without the jargon)<\/h2>\n\n\n\n
    \n
  • LOD<\/strong>
    Depending on the standard you follow, LOD can mean:\n
      \n
    • Level of Development<\/strong> (BIMForum\/US usage): how reliable<\/strong> and constructible<\/strong> an element is (100 \u2192 500).<\/li>\n\n\n\n
    • Level of Detail\/Definition<\/strong> (UK usage): the geometric detail<\/strong> of an element (often paired with LOI).<\/li>\n<\/ul>\n<\/li>\n\n\n\n
    • LOI \u2013 Level of Information<\/strong>
      The non-geometric data<\/strong> attached to model elements: specifications, performance data, classifications, costs, serial numbers, maintenance fields, etc.<\/li>\n<\/ul>\n\n\n\n
      \n

      Think of LOD<\/strong> as \u201cwhat it looks like and how accurately it\u2019s modeled,\u201d and LOI<\/strong> as \u201cwhat it knows<\/strong> about itself.\u201d<\/p>\n<\/blockquote>\n\n\n\n

      \n\n\n\n

      Why both are necessary<\/h2>\n\n\n\n
        \n
      • A highly detailed 3D component with no attributes<\/strong> is pretty but useless<\/strong> for quantities, procurement, or FM.<\/li>\n\n\n\n
      • A component packed with attributes but poor geometry<\/strong> won\u2019t coordinate or fabricate well.<\/li>\n\n\n\n
      • Clear LOD\/LOI targets prevent scope creep, rework, bloated files, and arguments over \u201cwhat\u2019s included.\u201d<\/li>\n<\/ul>\n\n\n\n
        \n\n\n\n

        The LOD scale at a glance (BIMForum\/US)<\/h2>\n\n\n\n
        LOD<\/th>What it means (short)<\/th>Typical use<\/th><\/tr><\/thead>
        100<\/strong><\/td>Conceptual massing, approximate size\/position<\/td>Feasibility, early options<\/td><\/tr>
        200<\/strong><\/td>Generic elements with approximate geometry<\/td>Scheme design, studies<\/td><\/tr>
        300<\/strong><\/td>Accurate size\/shape\/location; ready for coordination<\/td>Detailed design, approvals<\/td><\/tr>
        350<\/strong><\/td>Includes interfaces\/clearances and supports<\/td>Trade coordination, clash resolution<\/td><\/tr>
        400<\/strong><\/td>Fabrication level<\/strong>; includes connections and spools<\/td>Shop drawings, prefabrication<\/td><\/tr>
        500<\/strong><\/td>As-built verified<\/strong><\/td>Handover, operations & maintenance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        \n

        In the UK<\/strong>, you\u2019ll often see LOD (geometry)<\/strong> and LOI (information)<\/strong> used together to describe the \u201cLevel of Definition.\u201d<\/p>\n<\/blockquote>\n\n\n\n

        \n\n\n\n

        LOI: what information is expected?<\/h2>\n\n\n\n

        LOI is task-driven. Examples of data fields you might require:<\/p>\n\n\n\n

          \n
        • Design<\/strong>: fire rating, U-values, acoustic ratings, flow rates, loads, power.<\/li>\n\n\n\n
        • Procurement<\/strong>: manufacturer, model, lead times, unit rates, warranty terms.<\/li>\n\n\n\n
        • Construction<\/strong>: fixings, installation guides, approvals, method statements.<\/li>\n\n\n\n
        • Handover\/FM<\/strong>: serial numbers, spare parts, O&M links, maintenance cycles, location codes, barcodes\/QRs.<\/li>\n<\/ul>\n\n\n\n
          \n

          ISO 19650 encourages describing this as a Level of Information Need<\/strong>\u2014the minimum<\/strong> information required for a decision or delivery at a particular stage.<\/p>\n<\/blockquote>\n\n\n\n

          \n\n\n\n

          LOD vs LOI (the difference in one minute)<\/h2>\n\n\n\n
            \n
          • LOD (geometry)<\/strong> answers: How accurately is this modeled? Can I coordinate or fabricate from it?<\/em><\/li>\n\n\n\n
          • LOI (data)<\/strong> answers: What do I need to know about it to design, buy, install, operate, or maintain it?<\/em><\/li>\n<\/ul>\n\n\n\n

            Example \u2013 Door<\/strong><\/p>\n\n\n\n

              \n
            • LOD 300<\/strong>: Exact size, swing, frame profile placed accurately in the wall.<\/li>\n\n\n\n
            • LOI for design<\/strong>: Fire rating, acoustic class, vision panel spec.<\/li>\n\n\n\n
            • LOD 400<\/strong>: Manufacturer-specific geometry including hinges\/closers.<\/li>\n\n\n\n
            • LOI for procurement\/FM<\/strong>: Model code, finish, hardware set, warranty, serial number, maintenance interval.<\/li>\n<\/ul>\n\n\n\n
              \n\n\n\n

              Worked examples (copy these patterns)<\/h2>\n\n\n\n

              1) Air Handling Unit (AHU)<\/h3>\n\n\n\n
                \n
              • RIBA Stage 3 \/ LOD 300<\/strong>: Accurate footprint, connections, access zones.
                LOI<\/strong>: Duty\/standby, airflow (CFM), external static pressure, power, sound.<\/li>\n\n\n\n
              • Pre-construction \/ LOD 350\u2013400<\/strong>: Lifting points, exact nozzle sizes, maintenance clearances.
                LOI<\/strong>: Manufacturer, model, weight, electrical requirements, lead time, cost code.<\/li>\n\n\n\n
              • Handover \/ LOD 500<\/strong>: Verified geometry\/location.
                LOI<\/strong>: Serial number, O&M manual link, filter sizes, maintenance plan (e.g., quarterly).<\/li>\n<\/ul>\n\n\n\n

                2) Steel Beam<\/h3>\n\n\n\n
                  \n
                • LOD 300<\/strong>: Correct size\/grade, camber, location.
                  LOI<\/strong>: Section type, grade, fire protection requirement.<\/li>\n\n\n\n
                • LOD 400<\/strong>: Connection plates, bolt sizes, holes, weld symbols.
                  LOI<\/strong>: Fabricator, coating system, piece mark, pack list reference.<\/li>\n\n\n\n
                • LOD 500<\/strong>: As-built survey alignment.
                  LOI<\/strong>: Inspection certificate, test results, warranty.<\/li>\n<\/ul>\n\n\n\n
                  \n\n\n\n

                  A simple LOD\/LOI matrix you can paste into your BEP<\/h2>\n\n\n\n
                  Element Category<\/th>Stage<\/th>LOD (Geom)<\/th>LOI (Data fields \u2013 minimum)<\/th>Responsible Party<\/th>Validation<\/th><\/tr><\/thead>
                  Doors (A)<\/td>Design<\/td>300<\/td>Size, fire\/acoustic rating, material, hardware set ID<\/td>Architect<\/td>Model check + schedule review<\/td><\/tr>
                  Doors (A)<\/td>Procure<\/td>350\/400<\/td>Manufacturer, model, finish, cost code, lead time<\/td>Contractor<\/td>Submittal approval<\/td><\/tr>
                  Doors (A)<\/td>Handover<\/td>500<\/td>Serial no., warranty, O&M link, space code<\/td>Contractor\/FM<\/td>Field verify + COBie check<\/td><\/tr>
                  Ducts (M)<\/td>Coord.<\/td>350<\/td>System, size, insulation, pressure class<\/td>MEP<\/td>Clash report pass<\/td><\/tr>
                  Ducts (M)<\/td>Fab<\/td>400<\/td>Spool\/segment IDs, connectors, supports<\/td>Fabricator<\/td>Shop drawing approval<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                  \n

                  Tip:<\/strong> Tie LOI to a classification (Uniclass, OmniClass, MasterFormat) so schedules and exports stay consistent.<\/p>\n<\/blockquote>\n\n\n\n

                  \n\n\n\n

                  How to specify LOD\/LOI on your project (5 steps)<\/h2>\n\n\n\n
                    \n
                  1. Choose your framework and say it out loud.<\/strong>
                    In the BEP, state whether you\u2019re using BIMForum LOD<\/strong> (US), Level of Definition (UK LOD+LOI)<\/strong>, or an ISO 19650 Level of Information Need<\/strong> approach (recommended for modern contracts).<\/li>\n\n\n\n
                  2. Define by purpose, not by habit.<\/strong>
                    For each decision\/delivery<\/strong>, define the minimum<\/strong> geometry + data needed. Don\u2019t over-model.<\/li>\n\n\n\n
                  3. Create an Element Responsibility Matrix.<\/strong>
                    Who owns what, when, and to what LOD\/LOI? Note authoring software<\/strong> and exchange formats<\/strong> (e.g., RVT, NWC, IFC).<\/li>\n\n\n\n
                  4. Plan validation.<\/strong>\n
                      \n
                    • Geometry: clash tests, clearance rules, model health checks.<\/li>\n\n\n\n
                    • Data: property set rules, required field checks, COBie exports, ID\/QR verification.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                    • Lock it into your CDE workflow.<\/strong>
                      Use WIP \u2192 Shared \u2192 Published gates; refuse uploads that fail the LOD\/LOI checks.<\/li>\n<\/ol>\n\n\n\n
                      \n\n\n\n

                      Common pitfalls (and how to avoid them)<\/h2>\n\n\n\n
                        \n
                      • Mixing definitions<\/strong>: Saying \u201cLOD 400\u201d without stating which framework causes disputes.
                        Fix:<\/em> Cite the standard in the BEP and include a one-page legend.<\/li>\n\n\n\n
                      • Over-modeling<\/strong>: LOD 400 everywhere bloats files and time.
                        Fix:<\/em> Reserve LOD 400 for elements that must<\/strong> be fabricated\/prefabbed.<\/li>\n\n\n\n
                      • Under-specifying LOI<\/strong>: Great geometry, empty schedules.
                        Fix:<\/em> Tie LOI to decisions (tendering, ordering, FM), and make fields mandatory.<\/li>\n\n\n\n
                      • Late data<\/strong>: Trying to collect LOI at handover leads to gaps.
                        Fix:<\/em> Phase LOI delivery (design, procurement, install, validate).<\/li>\n\n\n\n
                      • No QA<\/strong>: Assuming authors will \u201cjust know.\u201d
                        Fix:<\/em> Automate checks using rule sets; fail uploads that don\u2019t comply.<\/li>\n<\/ul>\n\n\n\n
                        \n\n\n\n

                        Where LOD\/LOI really pay off<\/h2>\n\n\n\n
                          \n
                        • Cost & time<\/strong>: Reliable quantities and 4D\/5D planning reduce change orders.<\/li>\n\n\n\n
                        • Prefabrication<\/strong>: LOD 400 unlocks spooling, modular assemblies, and off-site manufacturing.<\/li>\n\n\n\n
                        • Safety & access<\/strong>: LOD 350+ ensures real clearance zones and maintenance reach.<\/li>\n\n\n\n
                        • FM readiness<\/strong>: Correct LOI at LOD 500 delivers usable digital twins\/COBie.<\/li>\n<\/ul>\n\n\n\n
                          \n\n\n\n

                          FAQ (30-second answers)<\/h2>\n\n\n\n
                            \n
                          • Is LOD 500 always required?<\/strong>
                            No. Use it where as-built verification<\/strong> adds value (e.g., FM-critical assets).<\/li>\n\n\n\n
                          • Do I need LOD 400 for everything?<\/strong>
                            No. Target fabricated elements<\/strong> (steel, ducts, MEP skids, fa\u00e7ades).<\/li>\n\n\n\n
                          • How does ISO 19650 change this?<\/strong>
                            It promotes Level of Information Need<\/strong>\u2014define exactly what\u2019s needed, avoiding arbitrary \u201ceverything at 400.\u201d<\/li>\n<\/ul>\n\n\n\n
                            \n\n\n\n

                            Takeaway<\/h2>\n\n\n\n
                              \n
                            • LOD = geometry reliability<\/strong>; LOI = data sufficiency<\/strong>.<\/li>\n\n\n\n
                            • Specify both by stage and purpose<\/strong>, name your standard<\/strong>, and enforce with checks<\/strong>.<\/li>\n\n\n\n
                            • Use LOD 400<\/strong> surgically for fabricated items; aim for LOI that matches decisions<\/strong> (design, buy, build, operate).<\/li>\n<\/ul>\n\n\n\n

                              With a clear LOD\/LOI strategy, your BIM model becomes a trustworthy engine for design coordination, procurement, construction, and facility management\u2014not just a 3D picture.<\/p>\n","protected":false},"excerpt":{"rendered":"

                              A complete, plain-English guide to Levels of Development\/Detail & Levels of Information Building Information Modeling (BIM) only delivers real value […]<\/p>\n","protected":false},"author":1,"featured_media":315,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-314","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nWhat is LOD and LOI in BIM? | Understanding Key BIM Concepts<\/title>\n<meta name=\"description\" content=\"Learn the difference between LOD (Level of Detail\/Development) and LOI (Level of Information) in BIM. Discover how these concepts works.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bimtraining.institute\/blog\/what-is-lod-and-loi-in-bim\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is LOD and LOI in BIM? | Understanding Key BIM Concepts\" \/>\n<meta property=\"og:description\" content=\"Learn the difference between LOD (Level of Detail\/Development) and LOI (Level of Information) in BIM. 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