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How to Fix Sagging Cabinet Shelves

Try these three easy ways to take the sag out of cabinet shelving or to support heavy shelf loads and prevent sagging.

By the DIY experts of The Family Handyman Magazine

Fix sagging shelves

Stocked up on canned goods, did you? Now the shelves are sagging and you’re looking for a quick fix.

If your cabinet has a center stile, check the back of the stile and the back of the cabinet to see if the manufacturer drilled shelf bracket holes to support the center (Figure A). They’re hard to spot and often ignored by whoever installed the cabinets.

If you find predrilled holes, just buy some brackets at the hardware store and install them. That’ll support the center of the shelf. If there are no holes, you have two choices: You can drill holes or you can make a “bridge” (Figures B and C).

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Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

    • Hammer
    • Circular saw
    • Drill/driver, cordless
    • Drill bit set

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

    • Shelf brackets
    • Decorative screws, washers

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April 14, 2:55 PM [GMT -5]

My kitchen cabinets are sagging on the bottom shelves where the shelf was just stapled onto the lower rail.The bottom shelf is only a 1/8" sheet of panel which was stapled into place. Cheap but it worked --till now anyway.
I plan to glue a piece of 1x1 or 1x2 wood underneath so it will support the shelf. To ensure its level, I'll clamp the wood in place in the front and use a T-post of wood at the back, which will be shimmed into place so it's solid. Once the glue sets, I can remove the supporting clamps.

In the cabinet under the sink, the bottom shelf (1/8" panel) has sagged over the years due to dripping water from the sink sprayer. I plan to use my multi-tool to cut out a 3/4" slot in the baseboard, then insert a 1x? piece of wood ripped to the correct height to eliminate the sag. I'll use construction glue to keep it in place. When done, I'll paint the end so you can't tell it's there.

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How to Fix Sagging Cabinet Shelves

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