Undermount Basins

An undermount basin is fixed beneath the benchtop, so the edge of the stone or solid top sits flush with the bowl. The result is a smooth, continuous surface with no rim to catch water or grime. 

That clean line is the main reason people choose this style. You can wipe water and crumbs straight from the benchtop into the bowl, and the overall look suits contemporary and minimalist bathrooms. It pairs well with stone, engineered stone and other solid vanity tops. 

There are a few things to plan for. The benchtop needs a precise cut-out, and the basin is sealed to the underside, so the material has to be suitable for this method. Your stonemason or installer will usually handle the cut-out and fixing, and polishing the cut edge is part of the job. 

Measure the vanity carefully and confirm the basin's dimensions and tap hole position. Choose a basin that leaves enough benchtop on each side for everyday use. 

Sealing is a key step. The basin is fixed and sealed under the top, so quality fixing and a tidy silicone join keep water out of the cabinet below. 

Browse the range to compare sizes and shapes, and find an undermount basin to suit your vanity. 

Frequently Asked Questions

Can I fit an undermount basin under a laminate benchtop? 
Generally no. Laminate edges can swell with moisture, so stone, engineered stone or solid surface tops suit better. 
How is an undermount basin fixed to the benchtop? 
It is fixed to the underside with silicone and brackets, then sealed at the join. 

Do I need a template for an undermount basin cut-out? 
Yes. The cut-out must match the basin exactly, so give your stonemason the template or dimensions. 
Where do taps go on an undermount basin? 
There is no tap deck, so taps mount on the benchtop or wall. Tell your fabricator before drilling. 

What is the difference between an undermount basin and a drop-in basin? 
Undermount basins sit below the benchtop for a flush surface, while drop-in basins rest in a cut-out with a rim.