How to Use a Laser Level

Top ten tips for using a laser level

Do you think that laser levels are a bit of a gimmick? Try one and we bet you will be reaching for one more and more often for all kinds of carpentry tasks. Here are a few tips to help you get started using laser levels.

By the DIY experts of The Family Handyman Magazine

Laser level overview

Like a lot of old, set-in-our-ways carpenters, I thought the low-cost laser levels were a bit of a gimmick. Then I tried one of the self-leveling cross-line lasers on a recent basement remodeling project and was shocked at how much time it saved. They’re like a chalk line and 4-ft. level and plumb bob rolled into one.

If you’re like me, whether you’re tiling a bathroom, remodeling a kitchen, or just hanging shelves or pictures, I’m sure you’ll love the speed and convenience of a laser level. It takes a while to appreciate just how versatile these tools are. But with a little practice, you’ll be reaching for one more and more often for all kinds of carpentry tasks. Here are a few tips to help you get started using laser levels.

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Tips for choosing a laser level

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Working in bright light? Use special glasses

Laser beams are hard to see in bright light. But you can improve the visibility of the line or dot with special red glasses. Don’t expect miracles, but the glasses definitely make the beam easier to see, and they’re worth buying if you’re working outside or in a brightly lit space. You’ll find laser-enhancement glasses at some home centers or online for $10 and up.

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Lay out on the floor first

With a point-type laser level, you can lay out your ceiling box and light fixture locations on the floor, where it’s easy to measure, and then use the laser to transfer them to the ceiling. This technique is especially useful for vaulted or sloped ceilings, where locating light fixtures would require a plumb bob.

Start by marking the light fixture locations on the floor with masking tape. Then elevate the laser and line up the downward pointing beam with the center of the fixture. Now you can mark where the upward pointing beam hits the ceiling.

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No-fuss square layout lines

All kinds of remodeling projects require square layout lines. Tiling—floors or walls—is a perfect use for a laser-level square. The only function of this special type of laser level is to project a pair of perpendicular lines, like crosshairs. A laser square is great for planning your layout: You can set it on the floor and measure from the lines to see how your tile layout will work. And it’s perfect for actually setting tile too, because the lines won’t get covered by the thin-set or mastic. You’ll find laser squares at home centers and online for about less than $50.

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Mount it on a tripod

Most laser levels have a threaded hole on the bottom that accepts a standard 1/4-in. tripod mount. Some laser levels come with a tripod. But if yours doesn’t, it’s worth buying one. A tripod allows you to easily adjust the laser to the best height and level it on uneven ground.

But you don’t need a tripod that’s designed for lasers. If you already have a camera tripod, it’ll probably work just fine with your laser since the threads are usually the same size. Or buy one cheap wherever cameras are sold.

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Self-leveling is a great feature

Adjusting a bubble-vial laser until it’s level in two directions is time consuming and error-prone. Self-leveling lasers are quick and easy to set up, and accurate. The only caveat is that you have to set up self-leveling lasers so they’re within about 5 degrees of level for the self-leveling feature to work. If the level isn’t within the required range, it will flash or shut off to indicate that it’s not working.

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Transfer stud locations with a laser

If you’ve ever installed kitchen cabinets, you know how time consuming it is to mark the stud locations inside the cabinet to position the mounting screws. With a laser level that projects a plumb line, it’s easy. You still have to locate the studs and mark the centers. But once this is done, you can simply align the vertical beam with the stud mark and drive your screw on the laser line. This tip will work for cabinets, shelves or any other installation that requires you to anchor to studs.

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Measure from a level reference line

A common misconception about using a laser is that you have to get the beam lined up exactly where you want the line to be. In most cases, it’s easier to simply project a laser line somewhere on the wall, and use it as a reference. Just measure up or down from the line the desired amount and mark the wall. When you use this method, it’s a good idea to mark the wall at the laser line, too. Then if the laser gets bumped, or you move it, you can reestablish the same reference line by lining up the laser with your mark. You can also use a point-type laser as a reference. You’ll just have to swivel it to make marks in other locations.

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Build walls with laser lines

Here’s a huge time-saver if you’re building walls in an existing space. Normally you would have to snap a chalk line on the floor, then use a plumb bob or a level with a long straightedge to transfer the floor marks to the ceiling. With a laser that projects a vertical beam, you can skip all these steps.

Just line up the laser where you want the wall to be, and you’ll see lines on the ceiling and floor. You can leave the laser in place and build to the laser lines, or you can use the lines to make marks for the top and bottom wall plates. Either way, it’s much faster and easier with a laser. A self-leveling cross-line laser works great for this. You can buy one for less than $100 at home centers or online.

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Find the high and low spots in a floor

When you start a kitchen cabinet installation or tile a wall, you need to know whether the floor is level and how much variation there is from the high and low spots. It’s easy to figure out with a laser level.

Just set the laser on a few scraps of wood or a paint can in a spot that will project a beam across the floor. Make a quick sketch of the floor plan. Then pick a spot and extend a tape measure to the floor. Note the measurement where the laser beam crosses the tape, and mark this on your sketch. Then check other areas of the floor and jot down these measurements. The location with the smallest dimension is the highest spot, and the difference between the largest and the smallest dimensions tells you how much the floor is out of level.

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Working outdoors? Try dusk or dawn

Lasers don’t show up well in sunlight. A rotary laser with a laser detector works in daylight, but this setup is too expensive for most DIYers. If you have a lot of outdoor leveling to do, consider renting a rotary laser and detector. But if you already own a laser level, try this tip first. Do your laser-leveling work at dusk or dawn, when the light is dim. Or if you’re a night owl, you could level your deck posts in the dark.

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