Check your measurements and contact your KD.

Sounds like they sent the wrong base cabinet--like an 18" instead of 21". Or, you had more than 54" to start with. Double check your measurements, and post some pictures.

Pretty much what the others have written. Find out where the mistake came from;

1) Did the KD measure incorrectly
2) Did the KD spec out the order incorrectly
3) Did the cabinet company ship out the wrong size vanity

You can order parts that properly fit. An alternative is to shift everything to the left, and to nix some or all of the filler strips to get a 3" wide or 6" wide gap, and add a thin 3" wide or 6" wide cabinet with a pull out shelf. Sort of like a kitchen pantry spice rack. The 6" wide could be for cleaning supply storage, the 3" wide as a medicine cabinet.

If you do go with the narrow insert route, Bath cabinets are not always the same dimensions at kitchen cabs. So confirm compatibility.

But get to the root of the problem. Your KD measured, your KD placed the order. Make your first call to the KD.

Good luck!

So KD did measure, I signed off of the 54" vanity including fillers in middle and both sides, but it ended up that the space was 57". Not sure how it grew but he must have mismeasured. They won't remake the drawer base but will split up the space evenly - some on the left and some between the sink base and drawer base, and will also make a decorative overlay filler.

I will check into the rev a shelf insert - that's a terrific idea, would love to use the space somehow.

I have an entire kitchen to come from the same place so I don't want to make a stink. this vanity is for a kid's bathroom, and frankly, I need the kitchen to go as smoothly as possible.

Don't think of it as being a matter of you making a stink.

It's a matter of letting others know that YOU are paying THEM to not make mistakes. That if they would like to work FOR YOU in the future, they had better pay a bit more attention.

You have them find out how the mistake occurred. You ask them how they can prevent it from happening in the future.

Don't forget, you're not dating this person. It's business.

Thanks for the suggestions - we've decided to move the space and add a rev a shelf 3" pullout where the filler would be. they're adding a matching decorative front. Will be great for shampoos, nail polish or whatever.

Not sure who's paying for the unit but it was $75, not a big deal at all.

Thanks again!