LiDAR Room Scanning: Measure a Room With Your iPhone

By MD Shaha Jalal, developer of Interior Design AI: Floor Plan · Updated September 22, 2026

Measuring a house with a tape measure is a two-person job that takes an afternoon and produces a page of numbers somebody still has to draw up. If your iPhone has a LiDAR sensor, you can instead walk the room slowly with the phone held up and come out the other side with a measured floor plan. This guide covers what LiDAR scanning actually does, which iPhones have it, and where it is and isn't the right tool.

What LiDAR adds that a photo can't

A photo tells the app what a room looks like; LiDAR tells it how far away everything is. The sensor sends out pulses of light and times how long they take to come back, which gives the phone real distances rather than inferred ones. That is the difference between a floor plan whose proportions look right and a floor plan whose wall lengths came from a measurement. It also means scanning works in rooms where a photo would struggle — awkward shapes, alcoves, dim corners.

Step-by-Step: LiDAR Room Scanning: Measure a Room With Your iPhone

1. Check that your iPhone has LiDAR. LiDAR is on the Pro and Pro Max models from iPhone 12 Pro onward. If your phone doesn't have the sensor, use the photo, PDF, or sketch input instead — you'll get room shapes without measured distances.
2. Clear a path around the room. You need to be able to walk the perimeter. Move anything blocking a wall, and open cupboard and interior doors you want included.
3. Start the scan and walk slowly. Hold the phone up at about chest height and walk the room at a steady, slow pace, sweeping so the sensor sees each wall from floor to ceiling. Rushing is the most common reason a scan comes back with gaps.
4. Cover corners and doorways deliberately. Pause briefly at each corner and each doorway. These are the features the app uses to close the room outline, and they're where an incomplete scan shows up first.
5. Scan room by room. Do one room at a time rather than sweeping through a whole floor in one pass. Smaller scans are easier to redo when one goes wrong.
6. Review, then export. Check the generated plan for missing walls or a room that hasn't closed properly, rescan anything that looks wrong, then export to PDF, DWG, DXF, IFC/BIM, or USDZ.

Rooms and surfaces that scan badly

LiDAR works by bouncing light off surfaces and timing the return, which tells you immediately where it struggles: anything that doesn't bounce light back predictably. Knowing the list in advance is quicker than rescanning three times and wondering what went wrong.

• Large mirrors: the sensor reads the reflection as space behind the glass, so a room can come out longer than it is.
• Floor-to-ceiling glass and glazed doors: light passes through and the wall may not register at all.
• Dark glossy surfaces, such as black gloss kitchen units or a polished dark floor, scatter or absorb the pulses.
• Very large open spaces: the sensor has a limited range, so scan in sections rather than from one spot.
• Cluttered rooms: furniture against a wall hides the wall, and the plan follows what the sensor could see.

How to check a scan before you trust it

Most bad scans are obvious once you look for the right things, and catching them while you're still in the room takes a minute. Before you leave, check the plan against the space:

• Is every room outline closed, with no gaps where a wall should be?
• Are the doorways and windows where they actually are, and roughly the right width?
• Does the room count match, and is anything missing, such as a cupboard or an alcove?
• Measure the longest wall in the room with a tape and compare it with the plan. If that one matches, the rest is usually in the right range.
• Measure anything you'll order against — a cabinet run, a flooring width — by hand regardless.

Frequently Asked Questions

Which iPhones can scan a room with LiDAR?

The LiDAR sensor is fitted to iPhone Pro and Pro Max models from the iPhone 12 Pro generation onward, and to iPad Pro models from 2020. On an iPhone without it, the photo, PDF, and sketch inputs still work — you just won't get measured distances.

How accurate is a LiDAR scan?

Accurate enough to plan layouts, work out whether furniture fits, and brief a contractor, but it is not a survey. Accuracy depends on how slowly and completely you scan, and it drops on glass, mirrors, and dark glossy surfaces, which reflect the sensor's pulses away. Spot-check critical dimensions — anything you're ordering cabinets or flooring against — with a tape measure.

Can I scan a whole house or flat?

Yes, room by room. Scan each room as its own pass rather than trying to capture a whole floor in one continuous sweep.

What does the scan produce?

A structured floor plan you can view in 2D or walk through in 3D, with room schedules, a CSV area inventory, and CAD and BIM exports.

Do mirrors and windows cause problems?

They can. LiDAR works by bouncing light back, so large mirrors, floor-to-ceiling glass, and dark shiny surfaces can read as holes or as false depth. Scan those walls from a slight angle rather than straight on, and check the result.

Does scanning need an internet connection?

The scan itself is captured by the phone's sensor. Generating and exporting a plan is part of the app's Floor Plan Studio workflow, so work with a connection available.