Every architect who hears “scan the building with your phone” asks the same thing next: is it accurate enough to model from? It is a fair question. An existing-conditions model is only useful if the dimensions are real, and a renovation built on a bad survey is worse than no survey at all.
Here is a straight answer about what iPhone and iPad LiDAR captures, where it is good enough to draft from, and what you should still verify in the field.
What the LiDAR Sensor Actually Measures
The LiDAR scanner on a Pro iPhone or iPad Pro is a time-of-flight depth sensor. It fires infrared points, measures how long they take to return, and builds a depth map of the room many times per second. Apple’s ARKit fuses that depth data with the camera and motion sensors to track the device through the space and reconstruct surfaces as you walk.
For room-scale capture, that pipeline is good. In independent testing, room-sized LiDAR captures typically land within a couple of centimeters over a normal room, which is well inside the tolerance most renovation and space-planning work needs. It is not a survey-grade terrestrial scanner, and it does not pretend to be. It is a fast way to get an accurate enough picture of a space that already exists.
Where It Is Accurate Enough
For the work most architects do day to day, phone LiDAR is more than enough:
- Renovation and retrofit as-builts. You need to know wall positions, room sizes, opening locations, and ceiling heights closely enough to design within them. LiDAR captures all of that in minutes.
- Space planning and test fits. Room areas and adjacencies come across cleanly, so you can study layouts against real geometry instead of a landlord’s marketing plan.
- Existing-conditions documentation. A measured plan with a Room, Wall, Door, and Window schedule beats a hand-sketch and a tape measure on both speed and completeness.
The honest framing: a phone scan replaces the hour you used to spend hand-measuring and the second hour you spent re-drawing it at the desk. It does not replace your judgment about which dimensions are critical.
Where to Verify Before You Trust It
A scan captures what is there, including the parts that are out of square and the spots where the sensor struggles. Check these before you build new design work on the import:
- Long runs. Tracking error accumulates the farther you walk. On a long corridor or a large open floor, confirm the overall length against a tape or a laser measure at the ends.
- Glass, mirrors, and gloss. Reflective surfaces confuse any depth sensor. Storefront glazing, mirrored walls, and high-gloss finishes are the places to double check.
- Critical clearances. Anywhere a dimension is code-driven or fabrication-driven, a door rough opening, an ADA clearance, a cabinet run, measure it directly. Treat the scan as the survey and the tape as the confirmation.
- Ceiling heights in tall or cluttered spaces. Open ceilings and ductwork can leave gaps. Spot check the heights that matter.
This is the same discipline you would apply to any existing-conditions survey. A scan does not remove the verification step. It removes the manual measuring and re-drawing around it.
The Scan-to-BIM Workflow
Once you accept that the scan is a fast, accurate-enough starting point that you verify, the workflow is short:
Scan on site → Refine the measured plan → Verify critical dimensions → Export IFC → Model in Revit / ArchiCADThe refine step matters. A raw mesh is not a model. In SiteScope you get an editable measured plan: trace and adjust walls, place doors and windows, label rooms, and correct anything the sensor read wrong before you export. What comes out is a structured IFC model with walls, doors, windows, rooms, slabs, and multiple stories as real objects, not a point cloud you have to trace over.
The Bottom Line for Architects
iPhone LiDAR is not survey grade, and it does not need to be. For existing-conditions modeling, renovation, and space planning, it captures geometry inside the tolerance the work requires, and it does it in minutes instead of a day. Treat it the way you would treat any field survey: capture fast, verify the dimensions that matter, then design.
If re-modeling buildings that already exist is eating your project hours, that is exactly the step the scan-to-BIM path removes.
See how scan to BIM works in SiteScope, or read the full breakdown of exporting IFC for Revit and ArchiCAD.