What Are As-Built Drawings? A Complete Guide
Author: Jonas Lood, Lightbound 3D
As-built drawings are documents that record the final, constructed condition of a building — not what was planned on the original blueprints, but what was actually built. Every construction project involves field changes, design modifications, and unforeseen adjustments that make the finished building different from the original design drawings. As-built drawings capture those differences and create a permanent, accurate record of the building as it exists.
If you own, manage, or work on buildings in Toronto and the GTA, as-built drawings are one of the most important documents you can have in your files.
What Do As-Built Drawings Include?
A complete set of as-built drawings typically documents the architectural layout, structural elements, and mechanical systems of a building. This includes floor plans with accurate room dimensions and wall locations, reflected ceiling plans showing lighting and HVAC distribution, elevations and sections documenting vertical dimensions and structural relationships, and mechanical, electrical, and plumbing (MEP) layouts showing the actual routing of ductwork, conduit, and piping.
The key distinction is accuracy. Original design drawings show intent. As-built drawings show reality. Over a building's lifetime, renovations, tenant improvements, and system upgrades create growing gaps between what the blueprints say and what actually exists in the walls and ceilings. As-built drawings close that gap.
Who Needs As-Built Drawings?
As-built drawings serve a wide range of professionals and situations. Property owners and facility managers use them for maintenance planning, space management, and insurance documentation. Architects and engineers need them as the starting point for renovation and retrofit design — you can't design a renovation without knowing exactly what's there. General contractors rely on them to scope renovation work accurately and avoid costly surprises during demolition. Building inspectors and code compliance officers reference them to verify that construction matches approved plans. And real estate professionals use them during due diligence for acquisitions and dispositions.
In Toronto's commercial real estate market, where older buildings are constantly being renovated and repositioned, accurate as-built documentation is especially critical. Many buildings in the downtown core have undergone decades of modifications with incomplete or missing records.
As-Built Drawings vs. Record Drawings
These terms are often used interchangeably, but there is a technical difference. Record drawings are the original design drawings marked up by the contractor during construction to note field changes. As-built drawings are new drawings created from independent measurement of the finished building. Record drawings reflect what the contractor remembers changing. As-built drawings reflect what was actually built, measured independently after the fact
For renovation and facility management purposes, as-built drawings produced from direct measurement are far more reliable — especially for older buildings where the original contractor's markups may be incomplete, missing, or inaccurate.
Traditional vs. 3D Scanning Methods
Traditionally, producing as-built drawings required a team with tape measures, laser distance meters, and a lot of time. A surveyor would manually measure every room, wall, opening, and system, then draft the drawings from field notes. For a typical commercial floor plate, this process could take days of on-site measurement and weeks of drafting.
3D laser scanning has fundamentally changed this process. A LiDAR scanner captures millions of precise data points in minutes, creating a complete point cloud of the entire space. This point cloud is then used to produce as-built drawings with millimetre-level accuracy — far beyond what manual measurement can achieve. A floor that would take a survey team three days to measure manually can be scanned in hours.
The accuracy improvement is significant. Manual measurement typically achieves accuracy within half an inch to an inch. 3D laser scanning achieves accuracy within 1–2 millimetres. For renovation design, MEP coordination, and code compliance, that difference matters.
As-Built Drawings and Scan to BIM
When as-built drawings are produced from 3D scan data, the deliverables can go beyond traditional 2D floor plans. The point cloud can be converted into a full 3D BIM (Building Information Model) in Revit, which includes not just room layouts but wall assemblies, structural elements, ceiling systems, and MEP infrastructure — all modelled in three dimensions with accurate spatial relationships.
This process is called Scan to BIM, and it produces as-built documentation that is far more useful for renovation design, clash detection, and facilities management than traditional 2D drawings. Architects and engineers working in Revit can use the as-built BIM model directly as the basis for their renovation design, eliminating the need to rebuild the existing conditions from scratch.
What Do As-Built Drawings Cost?
The cost of as-built drawings depends on the method, building size, and level of detail required. Traditional manual survey and drafting for a typical commercial floor plate might cost $3,000 to $8,000 or more, depending on complexity. 3D laser scanning with as-built drawing production typically starts at $1,500 for the scan, with Scan to BIM modeling starting at $2,000 — and the result is significantly more accurate and faster to produce.
For a detailed quote based on your specific project, contact Lightbound 3D at 437-775-9000 or visit our online order page.
Common Formats for As-Built Deliverables
As-built drawings and models are delivered in standard industry formats depending on the end use. CAD drawings are typically delivered in .dwg format for use in AutoCAD. BIM models are delivered as Revit .rvt files for architects and engineers working in the Autodesk ecosystem. Point cloud data is delivered in .rcp, .e57, or .las formats for teams that want to work directly with the raw scan data. And 2D floor plans can be delivered as PDFs for general reference and facility management.
Frequently Asked Questions
What are as-built drawings? As-built drawings are documents that record the actual constructed condition of a building, including floor plans, elevations, and mechanical systems. They differ from original design drawings because they reflect field changes, modifications, and the real dimensions of the space as it exists today.
How are as-built drawings created? As-built drawings can be created through traditional manual measurement and drafting, or through 3D laser scanning. Laser scanning produces point cloud data that is converted into accurate floor plans, elevations, and BIM models with millimetre-level precision.
How much do as-built drawings cost in Toronto? 3D laser scanning for as-built documentation starts at $1,500, with Scan to BIM modeling starting at $2,000. Traditional manual surveying and drafting typically costs $3,000 to $8,000 or more depending on building size and complexity.
What is the difference between as-built drawings and record drawings? Record drawings are the original design drawings marked up by the contractor to note field changes during construction. As-built drawings are independently measured documentation of the building as it actually exists, which is generally more accurate and reliable.
Get Accurate As-Built Drawings for Your Building
Whether you need as-built floor plans for a renovation, a full Revit BIM model for your design team, or comprehensive building documentation for facility management, Lightbound 3D delivers fast, accurate as-built drawings using 3D laser scanning technology. We serve building owners, architects, engineers, and contractors across Toronto and the Greater Toronto Area.
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