How to Scan a Room in 3D with iPhone LiDAR: The Complete 2026 Guide

A few years ago, getting an accurate 3D model and floor plan of a room meant hiring someone with a tripod-mounted laser scanner that cost as much as a car, or spending an afternoon with a tape measure and graph paper hoping you didn't transpose a number. Neither option was fast, and neither was something you'd do casually.

That's no longer the case. If you own a recent Pro iPhone or an iPad Pro, you're already carrying a real LiDAR sensor — the same time-of-flight technology used in survey-grade scanners, miniaturized into the back of your phone. Paired with Apple's RoomPlan framework, it can map an entire room into a clean, dimensioned 3D model in a single slow walk-around, with live on-screen guidance telling you exactly where to point next.

This guide walks through the whole process end to end: which devices work, how to prepare a room, how to capture a clean scan with RoomPlan, how to review and edit the resulting floor plan, and how to export it in whatever format your project needs — USDZ for AR, DXF for CAD, PDF and SVG for sharing, or raw RoomPlan JSON for developers. By the end you'll be able to scan a room confidently and know what to do when a scan doesn't come out perfectly.

Why Scan a Room in 3D?

A flat tape-measure sketch tells you a room is "about 4 by 5 meters." A 3D scan gives you a dimensioned model with walls, doors, windows, openings, and furniture all placed in space — something you can rotate, measure, drop into design software, or hand to a contractor. Here's where that actually pays off.

Real estate listings and floor plans. Agents use room scans to produce clean 2D floor plans and walkable 3D models for listings, which consistently hold a buyer's attention longer than photos alone. We go deep on this in our guide to using iPhone LiDAR for real estate floor plans.

Interior design and furniture planning. Designers scan a space, then test whether a sofa fits, how a layout flows, or what a new wall would do — all against accurate measurements instead of guesses. The exported model drops straight into design tools.

Architecture and AEC. Architects and engineers use scans as as-built documentation — a measured starting point for renovations and retrofits, captured in minutes rather than a half-day site visit.

Home renovation. Planning a kitchen remodel or built-in shelving? A scan gives you exact wall lengths, window heights, and door swings so you can order materials and cabinets without a second trip with a tape measure.

Facilities and as-built records. Property and facilities teams build a library of measured spaces for maintenance, space planning, and lease documentation.

AR and 3D creators. Game designers, VFX artists, and AR developers scan real rooms as scene references or as base geometry they refine in their tools.

The common thread is that a scan replaces a slow, error-prone manual process with something you can do on your phone in a few minutes — and the output is genuinely useful, not just a novelty.

What You Need to Scan a Room

Room scanning relies on two things: a hardware LiDAR sensor and Apple's RoomPlan framework. Not every iPhone has the sensor, so check your device first.

Devices with LiDAR:

• iPhone 12 Pro and 12 Pro Max, and every Pro / Pro Max model since (13 Pro, 14 Pro, 15 Pro, 16 Pro, and newer).
• iPad Pro 11-inch and 12.9-inch from the 2020 models onward.

The standard (non-Pro) iPhones do not include a LiDAR scanner, and neither do the base iPads or iPad Air. If your device isn't on that list, RoomPlan's live room capture won't be available to you. (You can still do photo-based 3D capture of objects, which we cover in LiDAR vs photogrammetry.)

Software: RoomPlan requires iOS 16 or later. Keeping your device on a current iOS release is the easiest way to make sure capture, editing, and export all behave.

The app: You'll need a capture app built on RoomPlan — like Lidar Scanner — which wraps the framework with live guidance, an editor, and the export formats you actually need.

That's the whole shopping list. No tripod, no markers, no calibration targets. The sensor and the framework do the heavy lifting; your job is to move the phone well, which is what the next section is about.

Step-by-Step: Scanning a Room with RoomPlan

RoomPlan works by fusing the LiDAR depth data with the camera feed and motion sensors in real time, recognizing architectural elements — walls, doors, windows, openings — and common furniture as you sweep the phone across the room. You're not taking a single photo; you're feeding it a continuous stream as you walk the perimeter.

1. Prepare the room

A few minutes of prep makes a noticeable difference:

• Turn the lights on. LiDAR itself works in the dark, but RoomPlan uses the camera feed to classify objects and align everything. Even, bright lighting helps it tell a door from a cabinet. Open the curtains during the day.
• Open interior doors you want recognized as doorways, and clear a walking path around the perimeter so you can keep a steady distance from the walls.
• Tidy up lightly. You don't need a showroom, but clutter on the floor and counters becomes noisy geometry. Clear obvious junk so the furniture RoomPlan does detect comes out clean.
• Note glass and mirrors. Large mirrors, floor-to-ceiling glass, and glossy TVs can confuse depth sensing. You don't have to cover them, but know they're the spots most likely to need a cleanup pass later.

2. Start the capture and frame the first wall

Open the app, start a new room scan, and stand near one corner. Hold the phone in portrait orientation, roughly at chest height, and point it at the junction where a wall meets the floor. RoomPlan needs a moment to lock onto the space — give it a beat before you start moving, and you'll see the first wall outline snap into place on screen.

3. Walk the perimeter slowly

This is the core of a good scan. Move slowly and steadily along the walls, keeping the phone aimed slightly ahead of you and sweeping gently up and down so the sensor catches the full floor-to-ceiling height. Think of it as painting the walls with the camera.

• Keep a consistent distance from the walls — roughly 1.5 to 2 meters (5 to 6.5 feet) is the sweet spot. Too close and the sensor can't see the whole wall; too far and detail drops off. LiDAR depth accuracy falls off beyond about 5 meters, so staying within a comfortable range keeps your geometry crisp.
• Overlap your coverage. When you reach a corner, pause and let the two walls register before continuing. Don't skip sections — the model is only as complete as the surfaces you actually pointed at.
• Pace yourself. Moving too fast is the single most common reason scans come out warped. If the on-screen model starts looking jittery, slow down or stop until it stabilizes.

4. Follow the live guidance

The best part of RoomPlan is that you're never guessing. As you scan, the app overlays the model it's building in real time and prompts you when something needs attention — "move closer," "slow down," or a highlight over an area it hasn't seen yet. Treat those prompts as a checklist. When the whole perimeter is filled in and the prompts stop, you've covered the room.

Make a deliberate pass over doors and windows so they're recognized as openings rather than blank wall, and a slow pass over any large furniture you want captured. RoomPlan detects common pieces — sofas, beds, tables, chairs, cabinets, appliances — and places them as labeled objects.

5. Finish and process

Once the room is complete, end the capture. The app finalizes the scan, cleaning up the geometry and snapping walls to sensible angles, then generates two things: a 3D model of the room and an auto-generated 2D top-down floor plan. This takes a few seconds, all of it on-device — nothing is uploaded to a server, so your scan stays private and works fully offline.

For a deeper dive into capturing the cleanest possible geometry — pacing, distance, handling reflective surfaces, and High-Fidelity mode — see our companion piece on LiDAR scanning tips for accurate iPhone scans.

Reviewing and Editing Your Floor Plan

A raw scan is rarely 100% perfect, and that's fine — the editor is where you fix the small stuff. Lidar Scanner's floor plan editor offers three modes so you can correct exactly what needs correcting without disturbing the rest:

• Geometry mode — adjust walls, corners, and room shape. Use this to straighten a wall the sensor caught at a slight angle, close a gap, or correct a length. Grid snap and on-screen measurements keep your edits clean and dimensioned.
• Labels mode — fix what each element is called. If a wide opening was tagged as a wall, or a window as a door, relabel it here so the plan reads correctly.
• Objects mode — manage detected furniture and add your own from a furniture catalog. Move, rotate, delete, or place pieces to match the real layout, which is handy for staging or design mockups.

The editor includes the conveniences you'd expect — undo/redo, grid snapping, live measurements, and automatic area calculation so you get square footage without doing the math. Spend a minute here cleaning up corners and confirming labels and your plan goes from "rough capture" to "ready to share."

If your scan came out badly enough that editing feels like a fight, it's usually faster to rescan than to repair — and the scanning tips guide will tell you what went wrong.

Exporting Your Scan

Here's where a 3D scan earns its keep: getting it into whatever tool comes next. Lidar Scanner exports both the 3D model and the floor plan in several formats so the output fits real workflows.

A few notes on choosing:

• USDZ is the go-to 3D format on Apple platforms. It's a single, lightweight file that opens in AR Quick Look so anyone on an iPhone or iPad can walk around your room model with a tap. The model can be parametric (clean architectural geometry) or, on Pro, a textured mesh that carries the real surfaces.
• RoomPlan JSON is the structured source of truth — every wall, opening, and object with its dimensions. It's the format to keep if you might re-import a scan later or feed it into your own software. For a full breakdown of when to pick each 3D format, read USDZ vs OBJ vs RoomPlan JSON.
• DXF, PDF, and SVG are the floor-plan exports. DXF is the one your architect or drafter wants — it drops into CAD as editable vectors. PDF is the universal "send it to anyone" format, and SVG is the crisp, scalable choice for design and web. Our guide to exporting iPhone floor plans to CAD covers the DXF workflow in detail.

Everything exports through the native iOS share sheet, so you can drop a file into Files, AirDrop it to a Mac, email it to a client, or send it straight into another app. And because all processing happened on-device, you control exactly when — and whether — a scan ever leaves your phone.

Troubleshooting Common Problems

Even with good technique, rooms occasionally fight back. Here are the issues that come up most and how to fix them.

Walls are crooked or don't line up

Almost always a pace problem — you moved too fast and the tracking drifted. Rescan that section slowly, pausing at corners to let walls register before moving on. For small errors, straighten the wall in Geometry mode with grid snap on.

A window or door wasn't detected

RoomPlan needs a clear, deliberate look at openings. Do a slow, dedicated pass directly facing the door or window. If it still reads as wall, relabel it in Labels mode — faster than rescanning the whole room.

A mirror or large window created phantom geometry

Reflective and transparent surfaces are LiDAR's hardest case; the sensor sees through glass or bounces off mirrors, creating depth artifacts. Avoid pointing straight into them when you can, then delete or correct the stray geometry in the editor afterward.

The room is too big and the scan drifts

RoomPlan is tuned for single rooms, not whole floors in one shot. Very large or long open-plan spaces accumulate tracking error over distance. Scan large areas as separate rooms, or break a big space into logical sections. Keep individual captures to a sensible size and your accuracy stays high.

Furniture is missing or merged together

Pieces pushed tight against each other or buried under clutter can merge or go undetected. Clear what you can before scanning, do a slow pass over the furniture, and tidy the rest in Objects mode — where you can also add pieces from the catalog.

Tracking "lost" mid-scan

If you covered the lens, moved too fast, or walked into a dark area, RoomPlan can lose its place. Stop, return the phone to an area it already mapped, hold steady to relocalize, then continue. Bright, even lighting prevents most of these.

Pro Tips for Better Room Scans

• Scan in a continuous loop. Walk the perimeter in one smooth circuit rather than darting back and forth. A single clean lap gives the cleanest geometry.
• Mind the ceiling height. Sweep up far enough to catch where walls meet the ceiling so wall heights come out right — useful for accurate volume and for tall windows.
• Use High-Fidelity mode for the work that matters. Pro unlocks a higher-quality capture mode that resolves finer detail. Standard is great for a quick layout; High-Fidelity is worth it for client deliverables and precise as-builts.
• Capture location metadata. With location enabled, scans are tagged with GPS and a true-north compass heading, so your floor plan is correctly oriented — handy when north matters, like for daylight studies or multi-unit records.
• Name scans as you go. A scan library full of "Room 1, Room 2" gets confusing fast. Rename each capture immediately; your scan library lets you browse, rename, and organize, and even import existing RoomPlan JSON.
• Do a quick review before you leave. Glance at the model on-site while you can still rescan. Catching a missing wall in the room beats discovering it back at your desk.

Want to go further? Our dedicated tips guide breaks down the exact technique for accurate iPhone LiDAR scans, and if you're weighing room LiDAR against photo-based capture for objects, LiDAR vs photogrammetry lays out the tradeoffs.

Start Scanning Your First Room

The distance between "I need a measured plan of this room" and "I have one" used to be a day of work and a specialist's invoice. With iPhone LiDAR and RoomPlan, it's a slow walk around the room and a few taps. Prepare the space, move the phone steadily, follow the live guidance, tidy up in the editor, and export to whatever your project needs — USDZ, DXF, PDF, SVG, or JSON, all generated privately on your device.

Lidar Scanner brings all of this together — RoomPlan-powered capture with live guidance, a three-mode floor plan editor, and every export format above — in one app. It's available on the App Store. Download it from the App Store, explore everything it does on the features page, see the full capture-to-export pipeline, and check the pricing to see what's free and what Pro unlocks.

Your phone already has the scanner built in. All that's left is to point it at a room.