Typically a custom vanity costs about twice as much as a prefab vanity because there are more subcontractors involved in making and putting the vanity together. Plus, you need to purchase materials separately from various vendors (vanity base, counter top, sink, & hardware).

Premade vanities typically cost $100 to $2,600 (varying by size, materials, and additional features). Custom vanities have a higher price point, falling between $500 and $2,800 for the build and up to $1,000 for installation.

Most bathroom vanity installations will require some carpentry work and most plumbers are not set up to handle that part of the project. On bathroom renovation projects the plumber is called in once the general contractor has all of the plumbing locations ready for the installation of the fixtures.