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Just bought a house and the bathroom vanity has an unfortunate countertop situation--clearly the countertop was too big for the vanity, but they just put it on top and let it hang over the side--resulting in a 5 inch gap between the vanity and the wall which you can see here on the left:

enter image description here

I would like to know if I can cut the countertop to size myself, preferably without detaching it from the vanity (though I'd obviously have to detach it from the wall). Here are a couple more photos to make it clearer what the material is:

molded countertop sink

underside of countertop

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Yes, you can cut it. Use an angle grinder with a masonry blade. I have seen it cut with a jigsaw as well, and a circular saw for flat pieces, but I prefer the angle grinder for this type of job. Cut it slightly long, then use a belt sander to take it down to your exact line and smooth the cut edge. This will (obviously) be messy, so do it outdoors. The "cultured marble" material is cast resin and will give off a fiberglass reek and quite a bit of resin dust, so wear goggles and a particle mask or respirator.

Cutting that much off the side will offset your sink basin from the plumbing, be prepared to change the drain and supply-line configurations. Cut it so that there will be a small gap (1/8"-1/4") left on the left side, as the walls are never perfectly square. You will then use caulking to fill that gap as well as where the backsplash meets the wall.

Another option would be to screw a strip of wood to the left end of the cabinet and to the wall on the left ("nailers"), then cut a piece of oak plywood to cover and fill the gap, leaving an unused hollow space behind. Stain and varnish to match the vanity.

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    +1 to jimmy's option 2: the filler strip. Way way easier. Way less mess. – User95050 Jul 17 '15 at 22:05
  • We would actually like it on the left because we need the space to the right of the vanity anyway. Thank you very much for your suggestions on the way to cut it! – Catherine Jul 17 '15 at 23:42

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