How to redo kitchen chairs?

What kind of chairs? Are they wood and need painting or do the seats need recovering? I have wiped down the wooden frames then sanded lightly and painted them a color that goes with my kitchen. Then I unscrewed the seats from the chair frames and removed the original material that was stapled to the seat bases, put new foam on the seats and replaced the old material with pretty new material. Then I screwed the seats back to the chair frames. Longest part was the cleaning and sanding. Looks great and

If they are wood, I would paint them with chalk paint.

Building a hidden pantry between counter and fridge

Paint them but don't use chalk paint, use an oil based semi gloss. Chair get hard use and need to be washed off every once in a while.

If they are wood, paint with chalk paint. To upholster them, take the seat of if possible and remove staples or tags. Use old fabric as your pattern guide. Then when your new piece is cut out. Place under the seat with right side down and chair front down on top. Staple each middle first, then each side of the middle staple. Then mitre the corners. Reattatch the seat.