Photogrammetry in Architecture: How 3D Scanning Is Changing Renovation Projects
Renovation projects have a fundamental challenge: the existing building never matches the original drawings. Walls have shifted, dimensions are off, and structural modifications over the years have created a building that exists only in reality — not on paper.
Photogrammetry and 3D scanning solve this problem by creating an exact digital replica of the existing structure. Here's how it works and why architects are adopting it rapidly.
What Is Photogrammetry?
Photogrammetry is the science of making measurements from photographs. By taking hundreds of overlapping photos of a building (from ground level or drone), specialized software reconstructs a precise 3D model of the structure.
The result: a photorealistic 3D model accurate to within 2-5cm of the real building.
How It's Used in Architecture
- Heritage restoration — Capture every detail of historic buildings before restoration begins
- Renovation planning — Get accurate dimensions without manual measurement
- Progress monitoring — Compare construction progress against the 3D model
- Marketing — Create stunning aerial 3D models of completed projects
- Legal documentation — Exact records of building condition for disputes
The Process
- Site capture — Take 200-500 photos of the building from all angles (or fly a drone)
- Processing — Software (Metashape, RealityCapture) stitches photos into a 3D point cloud
- Mesh generation — Point cloud is converted into a detailed 3D mesh
- Texturing — Photos are mapped onto the mesh for photorealistic appearance
- Export — Model is exported as OBJ, FBX, or PLY for use in CAD/BIM software
Cost in India
- Small building (residential): ₹15,000-30,000
- Medium building (commercial): ₹30,000-75,000
- Heritage site: ₹50,000-2,00,000 (depending on complexity)
- Drone survey: ₹10,000-25,000 per flight
Real Project
For a heritage bungalow restoration in Kolkata, we captured the entire building using photogrammetry in 4 hours. The resulting 3D model revealed structural details that weren't visible in any existing drawings — including original decorative elements that had been covered by later modifications.
What You Need
- A decent camera (even a modern smartphone works for basic captures)
- Drone for aerial perspectives (DJI Mini series is sufficient)
- Processing software (Metashape: ₹15,000 one-time, RealityCapture: pay-per-input)
- Powerful computer (GPU with 8GB+ VRAM for processing)
Need 3D Scanning for Your Project?
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