LiDAR (Light Detection and Ranging) is a sensing technology that measures distance by sending out pulses of light. The sensor times how long each pulse takes to bounce back from a surface and converts that time into distance. Thousands of measurements per second add up to a three-dimensional "point cloud" of the space.
From space programmes to your pocket
For decades LiDAR was expensive equipment for mapping, archaeology and autonomous vehicles. From 2020 it entered phones and tablets: today the Pro-series iPhones and iPads carry a LiDAR sensor in the rear camera block. Space scanning that once required five-figure hardware now travels in a pocket.
What is it for in architecture?
As-built surveys
Documenting the current state of an existing building is one of architecture's most labour-intensive tasks. With LiDAR the dimensions of a space are captured in a single walk-through; apps like DIMENS generate a floor plan automatically and export to CAD formats such as DXF.
Renovation and site surveys
In renovation, survey mistakes turn directly into cost. A scan records the entire space with dimensions during the first visit - no second trip because "we forgot to measure that wall".
The design process
A scaled as-built plan is the starting point of interior design. AI design tools also work best with real dimensions from a scan, so suggestions genuinely fit the space - DESIA is built exactly on this approach.
Phone or professional scanner?
- Phone LiDAR: fast, accessible and practical at home and office scale; accuracy around ±2 cm is sufficient for surveys.
- Terrestrial laser scanners: still the standard for millimetre precision and very large structures, at much higher equipment, operator and time cost.
The practical rule: phone scanning covers most everyday architectural work; professional scanners step in for millimetre-level jobs like monument restoration.
The takeaway
LiDAR turned measuring space from a specialist procedure into an everyday flow. That is its real impact on architecture: as data capture gets easier, all the time goes to design.