An undermount sink is fixed beneath the worktop for a seamless, easy-to-wipe join; an inset sink drops into a cut-out with its rim sitting on top of the surface, which is simpler to fit and works with a wider range of sink materials. Quartz suits both: the choice comes down to look, cleaning preference and sink material.
Undermount sinks
An undermount sink is fitted from below, with the worktop’s cut edge forming the visible rim around the bowl. This gives a clean, seamless transition from worktop to sink: there’s no raised lip to catch crumbs or water, and you can wipe debris directly from the worktop into the sink.
Pros:
- A seamless, minimal, contemporary look.
- Easier to keep the worktop-to-sink join clean.
- No raised rim to catch crumbs or spills.
Considerations:
- Requires precise fabrication, since the cut edge of the worktop is visible and needs to be finished neatly.
- Typically only suitable for solid-surface sink materials (stainless steel, granite composite, fireclay) rather than sinks with a moulded top rim.
Inset (top-mount) sinks
An inset sink drops into a cut-out from above, with its rim resting on top of the worktop surface around the edge of the hole. It’s the more traditional, and often simpler, installation method.
Pros:
- Works with a wider range of sink materials and styles, including ceramic Belfast sinks.
- Simpler and often quicker to fit.
- Easier to replace the sink independently in future.
Considerations:
- The visible rim can collect crumbs and moisture, needing a bit more attention when cleaning.
- Less of a seamless look than an undermount installation.
Which should you choose?
- Choose undermount for a clean, minimal, easy-to-wipe look, particularly with a handle-less contemporary kitchen.
- Choose inset if you want a specific sink style (like a ceramic Belfast sink) that isn’t available as an undermount option, or want simpler fabrication and future flexibility.
Frequently asked questions
Can any sink be fitted as an undermount with quartz?
No, the sink needs a suitable rim design for undermount fitting. Ceramic Belfast-style sinks, for example, are typically fitted as inset rather than undermount.
Is undermount more expensive than inset?
It can involve more precise fabrication work on the worktop’s cut edge, which may add modestly to the cost: discuss with your fabricator when getting a quote.
Does an undermount sink weaken the worktop?
No, when properly fabricated and supported, an undermount cut-out doesn’t compromise the strength of a quartz worktop.
Explore more
Browse the full range of 47 designs, or see our guides to edge profiles and worktop costs. Get a quote for your project.