As-Built Drawings: What They Are and What Should Be Included
As-built drawings are scaled drawings that document a building as it actually exists right now, not as it was originally designed. A typical set shows walls, openings, columns, stairs, floor and ceiling heights, and fixed equipment, drawn from measured field data rather than old record prints or tape-measure notes. The catch is that “as-built drawings” is not one fixed deliverable. The phrase covers everything from a single light floor plan to a full multi-sheet CAD package with elevations, sections, and reflected ceiling plans tied to a registered point cloud. What ends up in your set depends entirely on what you scope, so the useful question is not “what are as-built drawings” but “which drawings, at what level of detail, in which file formats.”
What as-built drawings are used for
As-built drawings exist so a design or facilities team can work from current reality instead of outdated records or field guesses. They feed renovation and tenant-improvement design, facility and owner record archives, construction coordination, facade and interior documentation, and early budgeting where an accurate base plan reshapes the whole scope conversation. Architects and engineers usually want them as a base layer they can design on top of.
One distinction matters: as-built drawings are not permit drawings, stamped engineering drawings, or construction documents. A construction set may be built using as-built information, but it carries professional liability, code review, and a license stamp that a documentation set does not. As-built drawings describe what is there; they do not certify that it is correct or compliant.
What a set typically includes
The right package matches the work downstream, not the longest possible list. A small tenant improvement often needs only floor plans and a reflected ceiling plan. A facade restoration needs exterior elevations and a few sections. A facility-records project may want the full set. Here is what each common drawing type carries:
| Drawing type | What it shows |
|---|---|
| Floor plan | Walls, doors, windows, columns, stairs, room layout, major fixed elements |
| Reflected ceiling plan (RCP) | Ceiling grid, lights, diffusers, visible ceiling-mounted elements |
| Interior elevation | Wall heights, openings, visible features on selected walls |
| Exterior elevation | Facade geometry, openings, major exterior elements |
| Section | Vertical relationships and floor-to-floor heights through a cut line |
| Roof plan | Roof layout, major features, access points when scoped |
| Equipment layout | Major visible equipment or fixed assets when scoped |
Most packages pair an editable CAD file with a flattened review file. The DWG is what your architect, engineer, or contractor edits, layers, and designs on; the PDF is what the owner reviews, redlines, and files. If anyone downstream needs to change the drawing, ask for DWG; if they only need a record sheet, PDF is enough. Specifying both up front is cheaper than coming back for the native file later.
Scan-backed vs hand-measured drawings
There are two honest ways to produce an as-built set, and they are not the same level of documentation. Hand measurement (tape, disto, sketches typed up later in CAD) can be fine for small, simple, rectilinear spaces where a few millimeters do not change anything. It gets unreliable fast once a space is large, irregular, occupied, or full of the out-of-square reality that older buildings always carry.
Scan-backed drawings start from a 3D laser scan of the existing conditions. We capture with a Trimble X7, which produces dense, dimensionally accurate point data for every visible surface in range. A single floor can take several scan setups stitched together; a full scan day on site runs up to roughly twelve hours depending on size and access. Those setups are registered into one coordinate system, and the drafter traces drawings directly against the point cloud, checking every line back to measured data instead of a sketch. The cloud also stays as a permanent record, so a question that surfaces months later (“how high is that beam?”) gets answered from the data rather than a return site visit.
Scan-backed is the right call when geometry is irregular, existing records are unreliable, elevations and sections matter, the site is hard to revisit, several teams need the same base, or the project might later grow into a model. For a deeper comparison of the two endpoints, see our as-built drawings vs. scan-to-BIM guide.
When BIM is the better deliverable
As-built drawings are 2D documentation. They are the right endpoint when the workflow is CAD-based, when only selected plans, elevations, or sections are needed, and when speed and cost matter more than a coordinated 3D model. They are the wrong endpoint when the design team lives in Revit, when categories need to carry data, when 3D clash coordination is part of the job, or when future phases will generate views from a model. In those cases the better path is scan-to-BIM, where the same point cloud becomes a modeled Revit file (exported to RVT or IFC) at a defined level of development. If you are unsure which file the people downstream need, our scan-to-CAD vs. scan-to-BIM breakdown sorts it by who uses the file and what they do next.
What is not automatically included
An as-built set is not a promise to document every condition in a building. Unless you specifically scope them in, a standard set leaves out hidden utilities, inside-wall conditions, full MEP systems, engineering calculations, code review, stamped documents, furniture and loose objects, fabrication-level detail, and any destructive investigation behind a finish. A laser scanner captures visible surfaces only; it does not see through drywall. If any of those matter, they have to be named, because they are real added work, not an implied default.
It also helps to name a precision expectation, since two projects can both ask for “floor plans” and mean very different tolerances. The US Institute of Building Documentation publishes a Level of Accuracy (LOA) framework that lets you specify measured tolerances rather than guess. Naming it up front prevents the most common dispute: a client expecting survey-grade precision on a documentation-grade budget.
What to agree before drafting starts
A clean engagement comes down to settling a short list before a single line is drawn: which drawing types, which file formats (DWG, PDF, or both), the area and floors in scope, the level of detail and accuracy, any CAD layer standard, whether dimensions are annotated, whether ceilings and roof are included, and what is explicitly excluded. Pinning these down protects both sides: the client knows what they are buying, and the production team knows what to draw.
If you do not know the exact drawing list yet, describe the use case instead. “We need a base plan to lay out a renovation on one floor” tells a good provider far more than “we need as-builts,” and lets them propose the right set rather than guess.
When you are ready to scope a set against your building, request a quote with the floor count, approximate area, and intended use, and we will come back with a defined deliverable list rather than a vague promise. For how those choices move the number, see what changes as-built drawing cost.
FAQ
What are as-built drawings?
Scaled drawings that document a building as it currently exists, including walls, openings, structure, heights, and fixed equipment, based on measured field data. They reflect actual conditions rather than the original design intent.
As-built vs. record drawings: what is the difference?
The terms overlap and are often used interchangeably. In strict construction usage, as-built drawings are field-marked during construction to show what was actually installed, while record drawings are the cleaned-up set an architect compiles from those markups at closeout. In the existing-conditions and renovation context this article covers, “as-built drawings” simply means an accurate, measured set of current conditions.
Who is responsible for as-built drawings?
On new construction, the general contractor maintains the field markups and the architect compiles the record set at closeout. For an existing building with no reliable drawings, the owner or design team commissions a documentation provider to produce a fresh as-built set from a field survey or laser scan.
How do I get as-built drawings for an existing building?
If usable originals do not exist, capture the existing conditions (a Trimble X7 laser scan for anything large or irregular) and draft them into a CAD set against the resulting point cloud. You scope the drawing types, formats, and level of detail, then receive DWG and PDF deliverables.
What is point cloud to CAD conversion?
It is the process behind a scan-backed as-built set: a registered point cloud (delivered in E57 or RCP/RCS) is traced into measured DWG drawings in CAD. The cloud is the source data; the CAD set is the human-readable deliverable drawn from it.
WeAre Capture turns laser scan data into as-built documentation, CAD drawings, and PDFs for existing-building work across the US. See sample deliverables or the as-built documentation service for scope.
Last reviewed: May 2026.