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Yes, your kitchen flooring should extend under your dishwasher. It is essential for creating a level and stable surface for the appliance and preventing moisture from seeping into the subflooring, which is costly to repair. Working with a kitchen contractor will ensure the new flooring accounts for the height of the dishwasher so it sits under the countertop properly without any glaring gaps.

When you install laminate flooring, you have to install spacers (also called expansion gaps) along the edges. This space along the edges gives the flooring the room it needs to naturally expand and contract. When you don't have an expansion gap, you can end up with damaged or warped planks. This can lead to uneven flooring, which is unsightly and can cause a trip hazard.

Start the first row of vinyl planks along the longest or most visible wall in the room. This will create a clean, straight foundation row to build off of. Snap a chalk line to guide the first row, and use spacers for the most precise installation—these maintain an even extension gap between the flooring planks and the wall. Finally, double-check that the first row is level before moving on to the second row. If it’s not, start over and get it right before completing the rest of the floor.

In most cases, you don’t need to put anything under carpet tiles—unlike regular carpet, which often has a layer of carpet padding beneath it. Carpet tiles attach directly to the floor (as long as it’s a firm surface like plywood, concrete, or tile) with peel-and-stick adhesive, double-sided carpet tape, or carpet glue.