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How To Install Kitchen Cabinets

A carpenter’s own kitchen install offers tricks for hanging cabinets that are plumb, level, and square—in rooms that aren’t.
By Mark Clement | Photos by Theresa Coleman

    It's important to ensure that the cabinets are level and plumb in all directions.

    It's important to ensure that the cabinets are level and plumb in all directions. To guarantee that this is the case, Mark checks (and double-checks) surfaces using a torpedo, a 2' level, and a 4' level.

    In theory, setting kitchen cabinets should be easy: Strike a couple of level lines, fasten cabinets to the wall, and presto! You have a new kitchen. Setting cabinets is a tempting DIY project because the installation principles are basic, but the reality—especially in the old-house world of crooked floors and uneven wall surfaces—is more complicated. Installing new kitchen cabinets that look like they were built with your old house requires technique and planning. Whether you’re doing it yourself or managing a contractor, my tricks-of-the-trade suggestions, from strategies for working alone to compensating for that out-of-plumb wall, can help turn your kitchen project into a plumb, level, and square reality.

    Mark level line


    Step One: Measure Carefully

    For a room with its flooring and wall cladding intact, the first thing I do is mark a control point or level line on every wall getting cabinets [A]. This line is an arbitrary control point from which all other measurements are taken. In my kitchen, I struck it all the way around the room.

    Placing my laser level atop my 4′ stepladder gives me a line in a good location—about 51″ above the floor, a location just 3″ under the typical upper cabinets’ bottom rail (which usually sits at 54″). I aim a laser dot at each corner of the room, snap blue chalk lines between them, then double-check the lines with a spirit level.

    Now that I have a level line, I can accurately measure to see if the floor is level (which is never the case in old houses). I walk around the room with my tape and measure from my level line down to the floor every few feet in order to find the floor’s high point.

    Measure control point from floor


    When I’m done, the smallest measurement between my level line and the floor is the floor’s high point, which is the control point for the next phase of layout. After I’ve found the high point, I use it to figure out where the base cabinets will sit. From the floor’s high point, I measure up 34½” and mark it on the wall [B]. In my case, that was 16½” down from the level line struck earlier. I then measure down from my level line 16½” in each corner of the room, connecting the dots by snapping chalk lines in between. This is the line on which the top rails of the base units will be fastened.

    Next, I measure for the upper cabinets’ location. Again from the floor’s high point, I measure up 54″, then strike another level line around the room (this measurement will sit above the initial level line). This second line represents the bottoms of the upper cabinets, which sit on the layout line.

    Install the ledger


    Step Two: Install the Upper Cabinets

    I find it easiest to install the upper cabinets first—no base cabinets in the way. First, I screw a straight ledger board to my layout line [C]. Next, I decide where to start, which usually means working my way out of an inside corner (where a cabinet touches two walls).

    Install upper cabinets


    I hoist the first cabinet to the ledger and fasten it [D]. If I have blocking between the studs, I just sink screws in the cabinet carcass’s four corners. If not, I mark stud locations inside the cabinet.

    It’s important to get this first cabinet as perfect as possible, because it will become the control point for all the other cabinets. If it’s even a tiny bit off, that small error is projected through the rest of the cabinets, and three or four cabinets later, a small error becomes a big mistake. So, with the cabinet secured on the wall, I check that it’s level and hanging plumb (straight up and down) [E]. It only takes a small wall surface imperfection to throw a cabinet out of plumb. If the wall is out of plumb (often the case in old houses), I shim behind the cabinet with full-size cedar shims until the cabinet sits perfectly plumb.

    Check upper cabinets for plumb


    The second cabinet is registered off of the first one. I lift it into place, then fasten it to the wall, taking care not overdrive the screws. The next step is to flush up and fasten the face frames together. Different carpenters have different approaches for doing this, including removing all the doors and clamping the face frames with specials clamps. I typically clamp the carcasses’ top and bottom rails just behind the face frames.

    Next, I pre-drill the face frame edges, slightly countersinking the hole. Then I sink a trim-drive screw to hold the face frames fast; now the two cabinets are one. (Note: If you have help to hoist and hang, you can attach an entire run of cabinets on the floor and hang them as one single unit.) Finally, I double-check plumb and level again (it doesn’t take much to throw you off), and repeat the process until the uppers are done.

    Measure for base cabinets


    Step Three: Install the Base Cabinets

    The bases are installed in essentially the same way, except that instead of resting them on a ledger, you register them to your level line on the wall and shim beneath and behind them as needed. Checking them for plumb and level in multiple directions—and often—is crucial. Also, register end units for plumb down from the uppers [F]—especially those that stand alone, like units on either side of a stove. If the top and bottom cabinets are offset from each other, you’ll notice later on.

    This is the time to double-check spacing for appliances, too. It’s easy for a cabinet to project off the wall slightly out of square, and the result will be that the stove or dishwasher no longer fits. The point, of course, is for your new kitchen to fit as well as your home’s original—installed with the same integrity and care and in plumb, level, and square.

    Mark Clement is working on his century-old American Foursquare in Ambler, Pennsylvania, and is the author of The Carpenter’s Notebook.

    Published in: Old-House Journal June/July 2010


    Elias Amaro May 6, 2011 at 4:45 am

    wonderful piece of information, thanks.

    Kitty O May 10, 2011 at 6:32 pm

    This is very helpful. I’m getting ready to “undo” the kitchen in my 1810 farmhouse and have been worried about how the cabinet installers will deal with the fact that nothing is level. I’m sending this on to them — thanks!

    C. Smith September 26, 2012 at 6:30 am

    Very helpful information. We just had a cabinet installer from one of the major home improvement chains install cabinets in our galley kitchen. He ignored the first and most important step on your site as well as the manufactures installation instructsion in finding the rooms highest point. He immediatley started installing cabinets at the lowest point and now we have one bank of cabinets that are 1.5 inches higher than the bank of cabinets on the opposite wall. I should have pulled up your suggestion for a tutorial for this installer. Live and learn I suppose!

    Timber Flooring Sydney December 2, 2013 at 6:29 am

    Nice Article! Great read here !!

    Pete J. August 16, 2014 at 2:09 pm

    Great article, but it does not addrees the reality that many times walls are not always flat and the cielings are not always level. The latter being critical when hanging tall cabinets, ie 40″, that will be at cieling height or 30″ cabinets under a soffet.
    I find that if you use a string, offset about an inch from the corner and end of the cablient run, parallel to the upper cabinet ledger board, and 1/2 the way up the wall from the ledger board you can measure the high and low spots on the wall. Using these measurements you can pre-place shims to offset the low spots creating a straight surface with the high point.
    For upper cabinets running to the cieling, or under a header / soffet I would recommend using a laser to find the low spot in the cieling and then measure down from there to establish the position of the ledger board. The spacing left above the cabinets can then be covered. The key is, after you have determined what the maximum gap above the cabinet will be, decide how you will cover it. If it’s up to 3/16″ you could consider caulk. If it’s greater than that you might want to use a trim strip. If you use trim you may need to lower your ledger board to allow for the width of the trim to be installed without hindering the door opening clearance.

    James February 28, 2015 at 2:43 pm

    Your article is a great guide. Thank you, next month I will be able to install my kitchen cabinets.

    Mike November 24, 2015 at 1:24 am

    Great suggestions but great additional comments Pete J.

    Cheryl Smith December 3, 2015 at 3:59 pm

    I definitely agree that careful measuring is critical. Whenever I do any kind of project, I meticulously measure twice. By doing this, I minimize the amount of mistakes I may potentially make. Hopefully, I also save time not having to go back and redo any part of project.

    John Carston June 17, 2016 at 3:22 pm

    I found this post to be a helpful guide for a cabinet installation project since you’ve listed each step in such detail. I also appreciate the pictures you’ve included for each step of the installation process as well. I’ll have to keep in mind to measure carefully before I begin installation. Thanks for the helpful tips.

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