Before you scan: prep the room
A clean scan starts before you open the app. The LiDAR sensor builds a 3D model from the surfaces it can see, so clutter, half-open doors, and movable furniture all become part of that model unless you deal with them first.
Walk the room once and clear a path along every wall. You do not need an empty space, but you do want the floor-to-wall and wall-to-ceiling lines visible, because those edges are what the app uses to lock in dimensions. Push chairs in, open blinds, and close closet doors you do not intend to measure.
Confirm your device actually has LiDAR. You need an iPhone 12 Pro or newer Pro model, or an iPad Pro from 2020 onward. Standard (non-Pro) iPhones do not include the sensor. Charge to at least 50 percent, since scanning is processor-heavy, and clean the rear camera glass. A smudged lens degrades the RGB texture that gets layered onto the LiDAR scan, even though the depth data itself comes from the laser.
Scanning technique: slow, steady, overlapping
The single biggest factor in scan quality is your movement. Hold the device at roughly chest height, screen facing you, and pan slowly. Think of painting the walls with the sensor rather than waving it around.
Start in one corner and work the perimeter in one continuous direction. Keep each pass overlapping the last by about 30 percent so the app can stitch sections together without drift. Capture where the floor meets the wall and where the wall meets the ceiling on every wall, because those lines define the room volume.
Stay within the sensor effective range. iPhone LiDAR is reliable to about 5 meters (16 feet) and degrades beyond that, so in larger rooms move closer to far walls rather than scanning across the whole space at once. Do not rush. A 200-square-foot room takes two to three minutes to scan well. If the on-screen mesh shows holes or warps, pan back over that area before you finish. See our full scan-to-estimate workflow for how this fits the rest of the job.
Get the lighting right
LiDAR measures distance with laser pulses, so it does not need light the way a normal camera does. You can scan a dim room and still get accurate dimensions. But the photo texture wrapped onto your model does need light, and that texture is what makes a render or a client presentation look believable.
Turn on the overhead lights and open the curtains. Even, diffuse light is ideal. Avoid scanning directly into a bright window, because the camera will blow out the exposure and the wall around it will look washed out in your final model.
If one corner is much darker than the rest, the texture there will be muddy. A quick fix is to flip on a work light or even the device flashlight for that pass. Consistent lighting also helps if you plan to feed the scan into the AI remodel engine later, since cleaner source textures produce cleaner generated renders. Harsh shadows and mixed color temperatures are the most common reasons a technically accurate scan still looks bad on the PDF.
Handling tricky surfaces
LiDAR has known blind spots, and knowing them up front saves you a re-scan. The sensor works best on flat, matte surfaces. It struggles with glass, mirrors, and dark glossy materials because the laser either passes through or scatters instead of bouncing straight back.
That means windows, glass shower doors, mirrors, polished black countertops, and high-gloss cabinetry can produce gaps or phantom depth in your scan. The fix is not to point the sensor straight at them. Scan glass and mirrors at an angle, and where the app drops the surface entirely, capture the frame or trim around it so you can reconstruct the opening dimension manually.
For a bathroom with a mirror wall or a kitchen with glossy tile, do a slower pass and accept that those specific surfaces may need a manual measurement check. Reflective stainless appliances are usually fine. When in doubt, verify one critical dimension with a tape measure. iPhone LiDAR is accurate to roughly 1 to 2 percent of the measured distance on good surfaces, but tricky materials are exactly where that margin slips.
Review and export the scan
Before you leave the site, review the captured model on-screen. Rotate it, check that all four walls closed into a complete room, and confirm there are no obvious holes in the floor or ceiling. Fixing a bad scan while you are standing in the room costs two minutes. Discovering it back at the office costs a return trip.
Spot-check the dimensions the app reports against your knowledge of the space. If a wall reads 8 feet 2 inches and you know the room is roughly 8 feet, you are in the right range. If it reads 12 feet, you have drift and should rescan.
In Alcovia, the scan flows straight into measurements, a material takeoff, and an estimate without a separate export step. If you are using a standalone scanner like Polycam or magicplan, you will typically export a floor plan or mesh and import it elsewhere. Keep the raw scan archived as as-built documentation, since it is useful for change orders and subcontractor coordination down the line.
Turning the scan into an estimate
An accurate scan is the foundation, but it only earns its keep when it becomes a number you can hand the client. Once the room is captured, the dimensions feed surface areas for floors, walls, and ceilings, which in turn drive quantities for flooring, paint, tile, and trim.
This is where a contractor-focused tool separates from a generic scanner. Polycam and magicplan give you a measured model, but you still move those numbers into a separate estimating sheet. Alcovia takes the same scan and produces measurements, a material takeoff, and an instant estimate against your own price list, then packages it into a client-ready PDF.
AI-driven takeoff tools claim up to roughly 98 percent accuracy and around 90 percent time savings versus measuring and counting by hand. The real win is doing it on the first visit. You scan the room, redesign it, and quote it before you leave the driveway. See how it works for the full on-site flow, from first pan to signed contract.
Scan your first room free
Point your iPhone at a room and turn it into measurements, a material takeoff, and a client-ready estimate. Your first project on Alcovia is free.
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