{"id":29201,"date":"2026-10-22T10:11:18","date_gmt":"2026-10-22T08:11:18","guid":{"rendered":"https:\/\/biblus.accasoftware.com\/en\/?p=29201"},"modified":"2026-10-22T10:11:22","modified_gmt":"2026-10-22T08:11:22","slug":"what-are-as-built-drawings","status":"publish","type":"post","link":"https:\/\/biblus.accasoftware.com\/en\/what-are-as-built-drawings\/","title":{"rendered":"As Built Drawings: Definition, Examples, and Uses"},"content":{"rendered":"<p class=\"sommario\">As-built drawings document the actual state of a building or infrastructure upon completion of construction works, reflecting any changes made during the construction process. Read the article to discover what as-built drawings are and why they are important<\/p>\n<p><!--more--><\/p>\n<p>Differences between a building&#8217;s original design and its actual construction are common, often due to on-site changes or unforeseen circumstances. As-built drawings document the actual state of the completed work, providing up-to-date information for its management and maintenance. To address these discrepancies and ensure reliable, up-to-date documentation for the operation and maintenance of a building, as-built drawings are essential.<\/p>\n<p>Let&#8217;s explore what as-built drawings are, why they are important, and how <a class=\"textualLink_usbim\" href=\"https:\/\/www.accasoftware.com\/en\/bim-management-system\" target=\"_blank\" rel=\"noopener\">BIM management software<\/a> can help create and manage them throughout the building&#8217;s life cycle.<\/p>\n<div id=\"attachment_29205\" style=\"width: 809px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-29205\" class=\"size-full wp-image-29205 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2023\/09\/BIM-Model-with-as-built-documentation.jpg\" alt=\"BIM Model with as built documentation\" width=\"799\" height=\"475\" \/><p id=\"caption-attachment-29205\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-29205 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2023\/09\/BIM-Model-with-as-built-documentation.jpg\" alt=\"BIM Model with as built documentation\" width=\"799\" height=\"475\" \/><\/noscript> BIM Model with as built documentation<\/p><\/div>\n<h2 id=\"what-are-as-built-drawings\">What are as built drawings?<\/h2>\n<p>As built drawings are graphic documents that show the actual state of the work that has been completed, including all changes made to the original design during the execution phase. In fact, it is very common for design drawings to be modified during execution and construction, and therefore, the completed works do not correspond 100% to those anticipated in the design phase.<\/p>\n<p>Ultimately, as built drawings reflect reality much better than other drawings (even executive ones) and are much more reliable for those who, over time, are called to handle the management and maintenance operations of the work.<\/p>\n<p>Regarding this aspect, I also suggest reading another article: &#8220;<a href=\"https:\/\/biblus.accasoftware.com\/en\/bim-as-built-meaning-how-its-created-and-its-purpose\/\">What is BIM as built?<\/a>&#8220;.<\/p>\n<h2 id=\"what-information-do-as-built-drawings-contain\">What information do As-Built drawings contain?<\/h2>\n<p>As built drawings represent the &#8220;high fidelity photograph&#8221; of the project at the end of the construction site. Their main goal is to record and document every single variation from the original project, ensuring complete transparency between the executing company, the designers, and the client. To be truly useful and comprehensive, an as built document must contain a series of fundamental data and technical details:<\/p>\n<ul>\n<li><strong>dimensional and geometric changes<\/strong> &#8211; updated dimensions, heights, and positions of walls, partitions, doors, windows, and elevator shafts that have undergone variations during the work;<\/li>\n<li><strong>actual layout of systems (MEP)<\/strong> &#8211; the exact tracing of HVAC ducts (heating, ventilation, and air conditioning), plumbing, electric cable passes, panels, and control boards;<\/li>\n<li><strong>structural variations<\/strong> &#8211; any adjustments made to beams, pillars, floors, or foundations to cope with unforeseen geological or technical issues that arose during excavation and construction;<\/li>\n<li><strong>specifications of materials and supplies<\/strong> &#8211; updated technical sheets, brands, models, and types of materials actually installed (in case of substitutions from the initial specifications);<\/li>\n<li><strong>sub-services and exteriors<\/strong> &#8211; the actual location of sewage networks, underground electric lines, inspection pits, access roads, land slopes, and landscaping works;<\/li>\n<li><strong>construction notes and reasons<\/strong> &#8211; written notes explaining the technical or regulatory reasons that necessitated each modification, complete with dates and approvals;<\/li>\n<li><strong>dedicated information title block<\/strong> &#8211; a box clearly indicating the wording &#8220;As-Built&#8221;, the dates of final revisions, the names of the contractor and the technicians responsible for the changes;<\/li>\n<\/ul>\n<p>In advanced digital workflows, all this data is collected on site through photographic surveys or laser scanning and integrated directly into the information model thanks to the use of a <a class=\"textualLink_usbim\" href=\"https:\/\/www.accasoftware.com\/en\/bim-management-system\" target=\"_blank\" rel=\"noopener\">BIM management software<\/a>. This allows for transitioning from traditional 2D documents to a real BIM As-Built, ready for the subsequent management and maintenance phase.<\/p>\n<h2 id=\"why-are-as-built-drawings-important\">Why are as built drawings important?<\/h2>\n<p>The main reason lies in the fact that modern building heritage is increasingly oriented towards interventions on existing structures (rehabilitation, energy requalification, and seismic adjustments) rather than new construction. In this scenario, having graphic documents that faithfully reflect the state of the work is not an option, but a necessary operational requirement.<\/p>\n<p>In general, the importance of as built drawings translates into five fundamental strategic advantages for professionals, companies, and clients:<\/p>\n<ul>\n<li>accurate documentation of the completed building;<\/li>\n<li>support for the maintenance and management of the property (Facility Management);<\/li>\n<li>reliable information for renovation interventions;<\/li>\n<li>better communication between professionals and clients;<\/li>\n<li>reduction of errors, costs, and project risks.<\/li>\n<\/ul>\n<h3>Accurate documentation of the completed building<\/h3>\n<p>In every construction site, even in the most rigorous, alterations from the original executive project inevitably occur. Geological unforeseen events, changes in distribution during execution, or variations in material availability almost always result in minor or major discrepancies.<\/p>\n<p>As built drawings provide the assurance of an immutable historical and technical archive, certifying exactly how the work was constructed. This level of detail constitutes a legal and asset guarantee for ownership, as well as being essential for regulatory compliance, expert appraisals, and agility practices.<\/p>\n<h3>Support for Property Maintenance and Management (Facility Management)<\/h3>\n<p>Once the construction work is completed, the longest and most burdensome phase of a building&#8217;s life begins: operation and maintenance. Trying to manage a technological system or a structure without updated maps means moving \u201cin the dark,\u201d exposing oneself to the risk of accidental breaks during drilling or the inability to locate a shut-off valve in case of emergency.<\/p>\n<p>Surveys and as built drawings constitute the fundamental starting point for Facility Management. They enable maintenance managers to:<\/p>\n<ul>\n<li>instantly locate ducts, manholes, electrical panels, and concealed connections within walls or ceilings;<\/li>\n<li>plan ordinary and extraordinary maintenance interventions in a targeted and timely manner;<\/li>\n<li>integrate technical data into a facility management software, digitizing the maintenance plan directly on 2D drawings and 3D models.<\/li>\n<\/ul>\n<h3>Reliable Information for Renovation Work<\/h3>\n<p>When preparing to intervene on an existing property for renovation, expansion, or restyling, the lack of updated documents forces technicians to carry out long, complex, and costly preliminary surveys (<a href=\"https:\/\/biblus.accasoftware.com\/en\/as-built-survey-what-is-it-and-what-is-it-for\/\" target=\"_blank\" rel=\"noopener\">as built survey<\/a>).<\/p>\n<p>Having access to reliable as built drawings drastically speeds up the initial phase of analysis and design. New technicians, designers, or structural engineers involved in the project can access real information about the property immediately, reducing the time to start work and eliminating uncertainties about the actual conditions of the structure.<\/p>\n<h3>Better Communication Between Professionals and Clients<\/h3>\n<p>The as built drawings serve as a transparent \u201ccommon language\u201d between the construction company, the project managers, and the end client.<\/p>\n<p>Through these documents, the client can verify at any moment the actual correspondence between what was estimated, what was paid, and what was actually completed on site. This fosters a climate of maximum mutual trust, avoids disputes at the end of the work, and simplifies the financial reporting of the project, facilitating the control of Work Progress (SAL).<\/p>\n<h3>Reduction of Errors, Costs, and Project Risks<\/h3>\n<p>Intervening on a building guided by outdated documents poses a high risk of error: inadvertent drilling of live cables or concealed pipes, unexpected demolition of load-bearing elements, penalties for unreported construction nonconformities.<\/p>\n<p>The as built drawings help mitigate site risks and reduce unexpected costs:<\/p>\n<ul>\n<li>time savings &#8211; eliminates work interruptions due to unexpected discoveries on site;<\/li>\n<li>financial savings &#8211; prevents unnecessary changes during work caused by misassessment of the existing conditions;<\/li>\n<li>worker safety &#8211; allows teams to work on systems and structural elements knowing their exact nature and position.<\/li>\n<\/ul>\n<div id=\"attachment_29204\" style=\"width: 809px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-29204\" class=\"size-full wp-image-29204 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2023\/09\/Difference-between-redline-drawings-and-as-built-drawings-managing-changes-during-execution.jpg\" alt=\"Difference between redline drawings and as-built drawings managing changes during execution\" width=\"799\" height=\"559\" \/><p id=\"caption-attachment-29204\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-29204 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2023\/09\/Difference-between-redline-drawings-and-as-built-drawings-managing-changes-during-execution.jpg\" alt=\"Difference between redline drawings and as-built drawings managing changes during execution\" width=\"799\" height=\"559\" \/><\/noscript> Difference between redline drawings and as-built drawings managing changes during execution<\/p><\/div>\n<h2 id=\"what-are-as-built-drawings\">What are as built drawings?<\/h2>\n<p>As built drawings can be understood as the 2D graphic documents that serve to define what modifications have been made to the project.<\/p>\n<p>Like all <a href=\"https:\/\/www.accasoftware.com\/en\/technical-construction-drawings\" target=\"_blank\" rel=\"noopener\">graphic documents<\/a>, their purpose is also to identify what the new dimensions, new positioning, and new types of the elements that have replaced the previous ones are.<\/p>\n<p>To clarify, here are some examples of what an as built drawing defines:<\/p>\n<ul>\n<li>the final position of walls, doors, windows and other architectural elements;<\/li>\n<li>the final position of the mechanical systems;<\/li>\n<li>the final position of any control panels,<\/li>\n<li>etc.<\/li>\n<\/ul>\n<h2 id=\"what-are-as-built-plans\">What are As-Built Plans?<\/h2>\n<p>When we talk about as-built plans and drawings, we refer to the complete set of technical documents that describe the building as it has actually been constructed. Unlike a single general drawing, a complete as-built documentation is articulated in various graphic specializations, each dedicated to a specific area of construction: from architectural to structural, up to mechanical, electrical, and plumbing (MEP).<\/p>\n<p>Each type of as-built drawing meets specific representation and consultation needs throughout the entire life cycle of the property.<\/p>\n<h3>As-Built Plans<\/h3>\n<p>As-built plans (or as-built floor plans) represent the two-dimensional layout on the horizontal plane of each level of the building. Compared to the initial project drawings, they incorporate all the distribution changes made during the execution phase, such as:<\/p>\n<ul>\n<li>the exact position and final thickness of partition walls and separations;<\/li>\n<li>the final placement and actual dimensions of doors, windows, and openings;<\/li>\n<li>the updated measurements of individual rooms and the actual distribution of usable areas.<\/li>\n<\/ul>\n<p>These documents are essential for the preparation of the final land registry practices and for verifying the intended use of the premises.<\/p>\n<h3>As-Built Elevations and Sections<\/h3>\n<p>While the plans show the horizontal development, the as-built elevations and sections illustrate the vertical development of the work:<\/p>\n<ul>\n<li><strong>as-built elevations<\/strong> &#8211; record the final appearance of the external building envelope, documenting any changes in facade coverings, colors, heights of parapets, or the position of external architectural elements.<\/li>\n<li><strong>as-built sections<\/strong> &#8211; show the vertical section of the building, highlighting the real altimetric measurements, usable heights floor by floor, the final thicknesses of the slabs and insulation packages, as well as the actual layout of ramps and elevator shafts.<\/li>\n<\/ul>\n<h3>As-Built Drawings of Electrical Systems<\/h3>\n<p>As-built electrical drawings map the entire electrical and special distribution network present in the property. Compared to the initial project, which often indicates only theoretical paths, the as-built reports:<\/p>\n<ul>\n<li>the actual path of conduits, cable trays, and underfloor pipes;<\/li>\n<li>the actual location of electrical panels, sockets, switches, light points, and junction boxes;<\/li>\n<li>the tracing of grounding systems, home automation, video surveillance, intrusion detection, and data\/LAN networks.<\/li>\n<\/ul>\n<p>Having updated electrical drawings is essential to allow maintenance personnel to intervene safely and make network expansions without damaging existing lines.<\/p>\n<h3>As-Built Drawings of Plumbing and HVAC Systems<\/h3>\n<p>The documentation of mechanical, sanitary, and air conditioning systems (HVAC &#8211; Heating, Ventilation, and Air Conditioning) is among the most complex and essential of the entire set of as-built.<\/p>\n<p>These documents include:<\/p>\n<ul>\n<li>the exact layout of the water supply, sewage discharge, and gas distribution pipes;<\/li>\n<li>the final placement of boiler plants, heat pumps, flues, and fan coils;<\/li>\n<li>the actual path of ventilation ducts and supply\/return air channels, including dampers and vents;<\/li>\n<li>the precise location of shut-off valves, meters, and inspection pits.<\/li>\n<\/ul>\n<h3>As-Built Drawings of Structures<\/h3>\n<p>As-built structural drawings document the load-bearing framework of the building as it has been constructed or consolidated. They accurately record:<\/p>\n<ul>\n<li>the dimensions and final positions of foundations, columns, beams, and shear walls in reinforced concrete, steel, or wood;<\/li>\n<li>any structural adjustments approved through changes during construction to address unforeseen geological or site issues;<\/li>\n<li>the specifics of the actual construction details, connection nodes, and the reinforcements that have actually been installed.<\/li>\n<\/ul>\n<p>Having updated as-built structural drawings is an essential requirement for any future seismic retrofitting, elevation, or change of use that requires new structural calculations.<\/p>\n<h2 id=\"as-built-drawings-vs-construction-drawings\">As Built Drawings vs Construction Drawings<\/h2>\n<p>Although both are used in the construction process, construction drawings and as built drawings serve diametrically opposed roles along the project timeline. The fundamental difference lies in the temporal dimension and operational purpose: the former indicate how the work is to be constructed, while the latter document how the work was actually carried out.<\/p>\n<p>Construction drawings are prepared by designers, architects, and engineers before work begins. They represent the set of detailed instructions, technical specifications, and geometric calculations necessary for the contractor to estimate costs and guide site workers. However, this is an &#8220;ideal&#8221; guide, based on the conditions assumed in the preliminary phase.<\/p>\n<p>As built drawings, on the contrary, are created during and at the end of the construction site. They record the actual reality of the building, incorporating all changes made during construction, adjustments to measurements, modifications to systems, and structural adjustments arising from unforeseen events or client requests.<br \/>\nTo quickly understand the key differences between the two types of drawings, one can refer to the following comparative table:<\/p>\n<div class=\"table-wrapper\"><table class=\"table table-striped table-hover table-header table-bordered\">\n<thead>\n<tr>\n<td><strong>Characteristic<\/strong><\/td>\n<td><strong>Construction Drawings<\/strong><\/td>\n<td><strong>As Built Drawings<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Drafting Timing<\/strong><\/td>\n<td>Before the start of work on site.<\/td>\n<td>During construction and at the end of the construction site.<\/td>\n<\/tr>\n<tr>\n<td><strong>Main Objective<\/strong><\/td>\n<td>Provide operational instructions to guide the construction.<\/td>\n<td>Document the actual state of the completed work.<\/td>\n<\/tr>\n<tr>\n<td><strong>Main Author<\/strong><\/td>\n<td>Design team (Architects, Engineers, Structural Engineers).<\/td>\n<td>Contractor, Project Manager or BIM Specialist.<\/td>\n<\/tr>\n<tr>\n<td><strong>Nature of Information<\/strong><\/td>\n<td>Theoretical, prescriptive, and based on estimates\/designs.<\/td>\n<td>Actual and verified on site.<\/td>\n<\/tr>\n<tr>\n<td><strong>Predominant Use<\/strong><\/td>\n<td>Metric computations, tendering, and work guidance.<\/td>\n<td>Maintenance, testing, Facility Management, and future renovations.<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<h2 id=\"how-to-create-as-built-drawings\">How to Create As Built Drawings<\/h2>\n<p>In general, there are no precise rules to follow for drafting as built drawings. Therefore, unless there are specific requirements from the relevant authorities, the drawings can be made as deemed appropriate. What I would recommend is to always remember some very important general aspects, such as:<\/p>\n<ul>\n<li><strong>Color Coding<\/strong> &#8211; having a legend of the colors used in the drawings to clearly indicate which elements have been added, which have been removed, important information, etc.;<\/li>\n<li><strong>Scale Drawings<\/strong> &#8211; all modifications indicated on the as built drawings must maintain the scale of the main drawing;<\/li>\n<li><strong>Date Indication<\/strong> &#8211; include the date of the modification and implement any further information;<\/li>\n<li><strong>Challenges Faced<\/strong> &#8211; specify what challenges were faced during the entire modification process, of any nature (regulatory, technical, regarding ground characteristics, etc.)<\/li>\n<li><strong>Systems<\/strong> &#8211; ensure to indicate the exact location of all systems installed during the works.<\/li>\n<\/ul>\n<p>For further information, read also <a href=\"https:\/\/biblus.accasoftware.com\/en\/as-built-checklist-the-useful-list-for-continuously-consistent-drawings\/\" target=\"_blank\" rel=\"noopener\">As-built checklist: the list to keep the drawings always updated<\/a>.<\/p>\n<h2 id=\"faq-on-as-built-drawings\">FAQ on As-Built Drawings<\/h2>\n<h3>What are as-built drawings?<\/h3>\n<p>They are graphical representations that indicate the actual state of the completed work, including all modifications made to the original project during execution. They faithfully reflect reality and are essential for the management and maintenance of the property.<\/p>\n<h3>What information do as-built drawings contain?<\/h3>\n<p>They contain dimensional and geometric changes, actual layouts of systems (MEP), structural variations, specifications of installed materials, locations of utilities, site notes with reasons for variations, and a dedicated &#8216;As-Built&#8217; information title block.<\/p>\n<h3>Why are as-built drawings important?<\/h3>\n<p>They are crucial for ensuring accurate documentation of the building, supporting Facility Management, providing reliable data for future renovations, improving communication between professionals and clients, and reducing errors, costs, and site risks.<\/p>\n<h3>What are as-built floor plans and drawings?<\/h3>\n<p>They are the 2D graphic representation (floor plans, elevations, sections, and technical diagrams) of the building in its actual state. They illustrate the final positions of walls, openings, finishes, structural elements, and systems (electrical, plumbing, HVAC).<\/p>\n<h3>What is the difference between executive drawings and as-built drawings?<\/h3>\n<p>Executive drawings are prepared by designers before the work begins and indicate how the work should be constructed. As-built drawings are prepared during or at the end of construction and document how the work was actually carried out, integrating all variations.<\/p>\n<h3>How to create as-built drawings?<\/h3>\n<p>They are created by surveying the actual state and updating the original project. It is important to code colors for changes, maintain scale drawings, indicate the dates of the variations, specify the difficulties encountered, and trace the exact location of all systems.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"international-product-banner-desktop\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=\"https:\/\/www.accasoftware.com\/en\/bim-management-system\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/usbim-en.jpg\" alt=\"usbim\" width=\"728\" height=\"160\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/usbim-en.jpg\" alt=\"usbim\" width=\"728\" height=\"160\" \/><\/noscript><\/a><\/div>\n<div class=\"international-product-banner-mobile\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=\"https:\/\/www.accasoftware.com\/en\/bim-management-system\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/usbim-en.jpg\" alt=\"usbim\" width=\"600\" height=\"500\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/usbim-en.jpg\" alt=\"usbim\" width=\"600\" height=\"500\" \/><\/noscript><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>As-built drawings document the actual state of a building or infrastructure upon completion of construction works, reflecting any changes made during the construction process. Read the article to discover what as-built drawings are and why they are important<\/p>\n","protected":false},"author":38,"featured_media":52807,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_data_scadenza_evento":"","_evento_nome":"","_evento_data":"","_evento_luogo":"","_evento_cta":"","keyword_en":"","keyword_es":"","keyword_fr":"","keyword_de":"","keyword_ptb":"","_note_content":"","footnotes":""},"categories":[118],"tags":[5057,5106,5139,5295],"class_list":["post-29201","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bim-and-building-design","tag-acca-usbim","tag-newsletter-306","tag-newsletter-330","tag-newsletter-468"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>As Built Drawings: Definition, Examples, and Uses - BibLus<\/title>\n<meta name=\"description\" content=\"As built drawings are graphic documents that depict the actual state of the asset after the works. 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