As-Built Drawings: How We Measure and Draft Existing Spaces
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As-built drawings are scaled CAD or BIM drawings of a building as it exists today, not as it was designed. At UrbanMeasure, our architectural technologists measure every space on site to 1/10 inch, draft it in AutoCAD or Revit, check it against the field notes, and typically deliver PDF and DWG/RVT files within three business days of the site visit.
In Canada’s fast-paced real estate and construction markets, where renovations, additions, and commercial tenant improvements (TIs) are frequent, one critical step often happens behind the scenes: creating precise as-built drawings. As-built drawings aren’t the original blueprints, they are accurate, up-to-date digital records of how a building or space actually exists today, capturing every modification, addition, or quirk accumulated over time. As-built drawings are the output of a defined building measurement process that ultimately delivers greater certainty in real estate transactions.
This post walks you through how professional real estate measurement services transform real-world spaces into reliable CAD or BIM as-built drawings, and why this service is essential for architects, builders, contractors, property managers, homeowners, and even realtors across Canada. This guide covers how as-builts are made; for how they’re used in leasing and retail, see the posts linked below.
What are as-built drawings?
As-built drawings (also called record drawings or existing conditions plans) provide scaled, dimensioned representations of a property’s current state. They document:
- Precise locations of walls, partitions, and structural elements
- Doors, windows, ceiling heights, and room layouts
- Key mechanical, electrical, plumbing (MEP) features like outlets, ducts, pipes, and fixtures
- Built-ins, stairs, built-in cabinetry, and any irregularities
- Exterior elevations, façades, or roof details when required
Created in professional software like AutoCAD or Revit, these drawings become the trusted starting point for design, permitting, renovations, leasing documentation, and compliance - helping prevent costly surprises during construction.
How are as-built drawings measured on site? (Step 1)
Every measurement project kicks off with a thorough site visit. The measurement team arrives equipped with professional tools to capture every dimension to 1/10 inch:
- High-accuracy laser distance measurers
- Digital tablets for real-time sketching and note-taking
- Mobile CAD apps to draft preliminary layouts on the spot
- Advanced LiDAR scanners for complex or large-scale projects (generating millions of data points turned into detailed point cloud models), with Matterport 3D tours available
Our architectural technologists (our Calgary technicians hold Architectural Technologist diplomas from SAIT) measure room by room, floor by floor; whether it’s a cozy Calgary condo needing a kitchen reno or a sprawling 100,000+ sq ft industrial space in Winnipeg. Nothing is left to memory or assumption; our measurement specialists leave with a complete, field-verified dataset.
How are field measurements drafted in CAD or BIM? (Step 2)
Back at the office (or on-site for rush jobs), measurements are imported into professional drafting platforms. The team produces:
- Detailed floor plans with clear dimensions and labels
- Interior/exterior elevation drawings
- Layered files organized for easy collaboration
- Optional extras like reflected ceiling plans, roof plans, or basic 3D models
Every line is double-checked for consistency and accuracy, no shortcuts here, as the results are meant to provide insurable measurements.
What do you receive, and how fast? (Step 3)
A solid measurement team will run a rigorous quality control (QC) process before anything leaves its hands. QC in this context necessarily includes:
- Verifying all key dimensions against field notes
- Confirming consistent architectural symbols, layers and drafting standards
- Ensuring clean, printable formatting
Clients receive a complete package:
- High-resolution PDFs for quick reference and sharing
- Native DWG or RVT files for seamless integration into design software
- Layered versions with trade-specific notes (e.g., electrical or HVAC layers)
As-built drawings are typically delivered within three business days of the site visit. Large or multi-building projects are scheduled with the client.
Who needs as-built drawings?
As-built drawings aren’t just for big commercial jobs; they are an invaluable asset for any type of property owner or real estate professional:
- Architects get reliable base files to launch designs without guesswork
- Interior designers plan remodels, custom millwork, or furniture layouts confidently
- Homeowners tackling additions, basement developments, or whole-home renovations avoid mid-project headaches
- Contractors produce accurate bids and material take-offs, with fewer change orders
- Property managers & developers document conditions for leasing, tenant improvements, or change-of-use permits
- Realtors occasionally gift detailed floor plans as a thoughtful closing touch for homes needing updates
Case study: residential renovation
A homeowner wanted to open up their kitchen to the living room in a house built in the 1980s. The original construction drawings showed a non-load-bearing wall, but renovations over time had added a beam above the wall, making it a structural component.
Working from the old plans alone, a contractor could have removed that wall, risking structural damage, injury and costly disputes. The as-built drawings showed the beam before any demolition began.
Case study: commercial tenant improvement
A property manager leased out a 2,500 sq ft retail space and provided the tenant with old construction blueprints. During build-out, it was discovered that walls had been relocated years ago, and the usable space was actually 2,100 sq ft.
A gap like this can lead to legal disputes and expensive build-out revisions, a current as-built survey would have shown the true size before the lease was signed.
Don’t build without a current, accurate as-built
A current, accurate as-built set might not be the most glamorous part of a renovation, but it’s one of the smartest investments a property owner can make. Precise as-built drafting reduces guesswork, lowers construction risk, and helps your design team start on solid ground.
For as-builts in specific situations, see commercial as-built drawings for tenant improvements, leasing and due diligence and retail as-built drawings. For the measurement standards behind leased area, see our guides to retail (BOMA Z65.5), commercial leases and office buildings (BOMA Z65.1).
As-built drawings FAQ
How long do as-built drawings take?
As-built drawings are typically delivered within three business days of the site visit. Large or multi-building projects are scheduled with the client.
How accurate are the drawings?
Every space is hand-measured on site to 1/10 inch, with LiDAR scanning added for complex or large buildings.
What file formats do I get?
High-resolution PDFs plus native DWG (AutoCAD) or RVT (Revit) files, with layers organized for your design team.
Are as-builts the same as original blueprints?
No. Original blueprints show the design intent; as-builts record what was actually built, including later renovations and changes.
Where do you work?
Calgary, Edmonton and across Alberta, British Columbia, Saskatchewan and Manitoba. Out-of-area travel fees apply.
Why property owners and real estate professionals use UrbanMeasure
Need professional as-built drawings for your next project? At UrbanMeasure, accurate property measurement has been a core part of our work for over 20 years, and our Calgary measurement technicians hold Architectural Technologist diplomas from SAIT. We specialize in detailed, field-verified as-built drawings (CAD), floor plans and elevations for residential and commercial buildings.
Our team specializes in hand-measured, professionally verified BOMA and residential property measurements that comply with applicable measurement standards and reflect the conditions observed at the time of measurement.
In addition to as-built drafting, UrbanMeasure also provides:
Get a quote for as-built drawings · Calgary 403-827-4420 · Edmonton 587-598-4420 · Toll-free 1-844-504-4420 · info@urbanmeasure.com · Head office: 4034 16th Street SW, Calgary, AB T2T 4H4
Written by Ken, BOMA Specialist / Architectural Technologist at UrbanMeasure.
