Kitchen Sink Buying Guide: Size, Material & Fit Tips

A new kitchen sink is one of those purchases where the wrong size or material choice only becomes obvious after it's plumbed in. Before you order, here's the sizing logic and material trade-offs worth knowing — grounded in the standard UK cabinet-width conventions installers actually work to.

How Cabinet Width Actually Determines Sink Size

The rule of thumb fitters use is straightforward: the cabinet sets the ceiling, and the sink itself has to sit smaller than the cabinet once you allow for the worktop cut-out, rim and fitting margin. A 900mm cabinet typically takes a sink around 800-825mm wide; a 600mm cabinet — one of the most common sizes in UK kitchens — usually suits a sink of roughly 500-550mm; and a 500mm cabinet is generally limited to a compact single bowl sink around 450-480mm. If you're working to a 400-500mm cabinet in a flat, utility room or secondary prep area, stick to the smallest single bowl options rather than trying to force in anything larger.

Stainless Steel or Granite Composite?

Once size is settled, material is the next decision. Stainless steel is the practical, budget-friendly default: it's easy to clean with just soap and water, and steel gauge (typically 16-22 gauge) tells you how thick — and how quiet — the bowl will be, with a lower gauge number meaning thicker steel. Granite composite, made from roughly 80% quartz sand and 20% resins and acrylics, resists scratching and scuffing far better than steel and won't dent, though it can chip at corners or around the waste hole if struck hard. It also comes in black, white, grey and beige, so it can match or contrast a worktop in a way steel never will — at a higher price point than entry-level stainless. Descaling isn't just a radiator or kettle job either — hard water areas across much of the UK will leave limescale spots on both steel and composite sinks, so a quick wipe-down after washing up keeps either material looking newer for longer.

Single Bowl or Double Bowl?

This comes down to how you actually use the sink day to day. A single bowl, like the options in our Single Bowl Sinks collection, suits smaller kitchens or anyone who mainly stacks and soaks rather than washing and draining side by side. A double bowl earns its keep if you regularly need to separate washing-up from food prep, or want a dedicated bowl for a colander or drying rack. Either way, check the bowl depth against your tallest regularly-used pans before you commit — a sink that looks generous on a spec sheet can still be too shallow in practice.

Getting the Fit Right Before You Order

Measure your cabinet's internal width, not just the front face, and confirm your worktop's cut-out template matches the sink you're choosing before it's fitted — swapping a sink after the worktop is cut is far more disruptive than getting the sizing right upfront. Our full Kitchen Sink collection is filtered by bowl configuration and material, or visit Ultra Bathroom to see how a new sink fits alongside the rest of your kitchen fittings.