Most comparisons of sink materials are written by people selling sinks, so they compare bowls on their own. A sink in a kitchen is never on its own: it sits in a hole cut in the worktop, and in a stone kitchen the stone decides as much about how it looks and lasts as the bowl does. Worktop Worx lists a short range of both kinds and cuts the opening for whichever you choose, so this guide compares them from the worktop side and stays careful about what any sink can promise.
Key points
- Both suit a stone worktop and both can usually be undermounted; choose on looks and care
- Steel shrugs off pans and boiling water but shows water spots and fine scratches
- Composite is a matt solid colour that hides water marks and can match or contrast with the stone
- The sinks we list cost £190 to £200 in steel and £190 to £200 in composite, sink only, as listed in our shop
- The bowl must be on site before templating, and an undermount is carried on support, not on the stone
01 / 09
Which is better, a composite or a stainless steel sink?
Neither, in general. Both suit a stone worktop, both can be fitted under it, and the choice comes down to the look you want and the kind of marks you would rather live with. Steel is the workhorse: it shrugs off a dropped pan and boiling water, and it shows water spots and, over time, fine scratches. A granite composite sink gives a matt, stone-like bowl in one solid tone, hides water marks well and is quieter than steel under a running tap.
So if water marks on the bowl would bother you most, composite suits; if heavy pans and boiling water go into it every day, steel suits; and either is a good answer. What matters more, from where we stand, is that the bowl you choose is in the room before the worktop is measured.
02 / 09
Which sinks do we list, and what do they cost?
We keep the range short on purpose. Of our sinks, 9 are stainless steel and 8 are composite, and their prices overlap, so cost is rarely what decides between them. The figures below are the sink only, as listed in our shop, before the opening in the stone, which is itemised on the worktop quote.
| Compared | Sinks listed | Price, sink only | Finishes | Ranges |
|---|---|---|---|---|
| Stainless steel | 9 | £190 to £200 | Gold, GunMetal and Silver | Lumen Core, Lumen Solo and Lumen Zen |
| Granite composite | 8 | £190 to £200 | Black, Grey and White | Lumen G, Lumen Stone and Lumen Terra |
Our stainless steel sinks come in gold, gunmetal and silver finishes, so steel is no longer only silver. Our composite sinks come in black, grey and white. Prices are as listed in our shop and can change; the product page always carries the current one.
03 / 09
Can both kinds be undermounted in a stone worktop?
Steel suits an undermount opening in stone particularly well: the polished edge of the worktop runs straight down into the bowl. A composite bowl can go under the stone where its maker designs it for that, and whether a particular bowl is designed for it is the maker’s call, so tell us the model you have chosen and we confirm it before we come to measure. An inset bowl, which hangs from a rim on top of the stone, works with either material.
Undermounting changes the worktop more than the sink. The cut edge is exposed all the way round, so it is machined true and polished to match the top, and the inside angles of the opening are radiused rather than cut square, because a sharp angle in stone is where a crack starts. Our guide to undermount, inset and Belfast sinks covers the reveal, grooves and the cost of each option.
04 / 09
Which matches the worktop better?
This is where composite has the clearer advantage, because it comes in one solid tone. A black or grey bowl can disappear into a dark worktop or stand out against a pale one: a black bowl under black granite reads as one surface, and the same bowl under white quartz is a deliberate contrast. A grey composite under grey quartz is the quietest combination of all.
Steel does not try to match the stone; it pairs with the tap instead. A gold or gunmetal finish is chosen to sit with the tap and the handles, and plain silver goes with almost anything. If the worktop is strongly veined, a plain steel bowl often looks calmer than a coloured one competing with the pattern.
05 / 09
Does an undermount sink need support bars?
It needs support, and the stone is not it. An undermounted bowl is bonded to the underside of the worktop and also carried on rails or a cradle fixed into the base unit, so a full bowl and a stack of pans loads the cabinet rather than the edge of the opening. Our support bars are listed at £60, and are best ordered with the bowl so they are on site when we fit.
The base unit has to be sound for that to work, whichever material the sink is made of. On a replacement worktop over existing units, that is part of the check we make before quoting rather than a surprise on fitting day. A very heavy fireclay or cast iron bowl is a different case altogether and usually wants a unit built to take it.
06 / 09
How do you clean a composite or stainless steel sink?
Follow the maker’s care instructions for the bowl, because they know the material and its finish, and they differ between products. As a general guide, steel shows water spots and fine scratches, and a brushed finish hides both better than a mirror polish. A white or pale composite shows tea and coffee sooner than a dark one and wants a regular clean.
Whatever you use on the bowl, keep it off the stone around it unless it is safe for the worktop as well. Warm water and a little washing-up liquid is safe on every worktop we fit; descalers, bleach left to sit and abrasive pads are not. Tip boiling water into the bowl rather than across the stone, and look under an undermount sink every few months, because the seal beneath it is invisible from above.
07 / 09
Can you fit a sink into a stainless steel worktop?
Not with us. We fit sinks into stone, not stainless steel worktops: quartz, granite and sintered stone, cut in our workshop from a template of your kitchen. A steel worktop with an integral bowl is a different product made by a different trade.
What we can do is put either kind of bowl into the stone worktop we make for you, with the opening cut and polished in the workshop and the sink seated and sealed on fitting day. A plumber then connects the water and waste, booked for after us so the silicone has cured.
08 / 09
How do composite and stainless steel sinks compare, side by side?
| Compared | Stainless steel | Granite composite |
|---|---|---|
| What it is | Steel, in a metal finish | Crushed stone bound in resin, a solid colour |
| Finishes we list | Gold, GunMetal and Silver | Black, Grey and White |
| Price, sink only | £190 to £200 | £190 to £200 |
| Shows | Water spots and, over time, fine scratches | Tea and coffee sooner on a pale bowl |
| Hides best | Spots and scratches, in a brushed finish | Water marks |
| Under a running tap | Louder | Quieter |
| Matching the worktop | Pairs with the tap | Can match or contrast with the stone |
| Undermount in stone | Suits it well | Where the maker allows; confirm the model |
Read the table as a list of differences rather than a score. The worktop around the bowl matters as much as either material, and so does what is cut into it, which is why the options for the sink cut-out are worth reading before you order.
09 / 09
Which sink should you choose?
Lean towards stainless steel when
- Heavy pans and boiling water go into the bowl every day
- You want the sink to pair with a gold, gunmetal or silver tap
- The worktop is strongly veined and a coloured bowl would compete with it
Lean towards granite composite when
- Water marks on the bowl would bother you more than anything else
- You want the bowl to match a dark worktop, or contrast with a pale one
- A quieter sink under the tap matters to you
Then choose the bowl before anyone templates, because the opening is cut to it. Our sinks are listed with their prices, and the steel and composite ranges each have their own page with every model on it.
