Nearly every patio conversation we have lands here. Someone's been on a supplier website, seen porcelain at one price and Indian sandstone at another, and wants to know whether the difference is worth it.
It's a fair question and the answer isn't the same for every garden. We lay both, most weeks, so here's the honest comparison rather than whichever one carries the better margin.
Key takeaways
- Porcelain is manufactured, so every slab is identical; sandstone is quarried, so no two are
- Outdoor porcelain is textured and grips well in the wet, it isn't bathroom tile
- Porcelain needs a slurry primer on the back of every slab or it will lift, and that's not optional
- Sandstone costs less to buy and less to lay, and suits older houses better
- Whichever you pick, the base underneath decides whether it's still flat in fifteen years
The Short Answer
If you want crisp, modern and no upkeep, and the house has grey windows or bifold doors, porcelain. If you want warmth and character on an older property, or the budget is doing a lot of work elsewhere in the garden, Indian sandstone.
That covers most people.
What They Actually Are
Porcelain is fired clay, pressed and baked at high temperature until it vitrifies into something close to glass. It comes out dead flat, dead uniform, and calibrated, meaning every slab is the same thickness to within a fraction of a millimetre. Outdoor slabs are usually 20mm. Water absorption is under half a percent, which is where most of its advantages come from.
Indian sandstone is quarried and split by hand along its natural bed, which is why the surface is riven and rippled rather than flat. Thickness varies from slab to slab because nature doesn't calibrate anything. It's porous, so it takes up water, weathers over time and can stain.
One is a manufactured product with consistent properties. The other varies slab to slab because it came out of the ground that way. Almost every practical difference between them comes back to that.
Looks: Uniform or Variegated
Nothing technical separates them here. It comes down to the house.
Porcelain gives you a flat, even field of colour with narrow, sharp joints. Lay it in a large format and it reads as one continuous surface running out from the house. It's the look that works with rendered walls, grey aluminium windows and composite fencing, and it's why nearly every new build patio we do these days is porcelain.
Sandstone does the opposite. Every slab is a slightly different tone, the surface catches light unevenly because it's riven, and the mixed-size patio packs break up any sense of a grid. It looks settled rather than new, which is exactly right on a cottage, a Victorian terrace or anything with a mature planted garden around it. The colour names take some decoding, and we've been through raj green, kandla grey and rippon buff properly in our Indian sandstone patio guide.
Put a porcelain patio on a 1930s semi with a rambling garden and it can look like it's been dropped in from somewhere else. Put sandstone against a rendered extension with anthracite bifolds and it can look fussy. Match the surface to the house, not to whichever photo you liked on Instagram.
The Wet Test
The question we get asked more than any other is whether porcelain is slippery. It's a reasonable worry, because most people's reference point for porcelain is a bathroom floor.
Outdoor porcelain is a different product. It's textured during manufacture and typically carries an R11 slip rating, which in practice grips better in the wet than smooth natural stone does. Sandstone's riven surface is also good in the wet for the same reason, all that texture.
What actually makes a patio slippery in this country is algae. Give any surface a damp, shaded winter and a green film builds up, and that's what people slip on. It happens on both materials. The difference is that porcelain is non-porous so the algae sits on top and washes straight off, while on sandstone it gets into the surface a little and takes more scrubbing.
Laying Them Is Not the Same Job
Everything that makes porcelain dearer to lay happens before anyone sees the finished patio.
Underneath, the two want the same things: a dug-out and compacted sub-base, then a full wet mortar bed under every slab, never dabs at the corners. Both get laid to a fall so water runs off, and both get a proper brush-in jointing compound.
The difference is porcelain's one non-negotiable extra. Because it's vitrified and non-porous, mortar has nothing to grip on the back of the slab. Every single one has to have a slurry primer painted onto its underside immediately before it's bedded. Miss it, or let the primer dry before the slab goes down, and you get a patio that looks flawless for twelve months and then starts rocking and lifting slab by slab.
💡 Tip: If you're getting quotes for porcelain, ask the installer how they prime the slabs. If the answer is vague, or they say it isn't necessary, get another quote. It is the single most common reason porcelain patios fail, and it's entirely avoidable.
Cutting is the other difference. Porcelain has to go on a wet saw with a diamond blade and it's slow, particularly around steps, drainage channels and inspection covers. Sandstone cuts far more easily. On a patio with a lot of cuts in it, that's real hours.
Sandstone has its own awkwardness. Because the slabs vary in thickness, the mortar bed under each one has to be adjusted individually to bring the surface flat. That's slower than laying calibrated porcelain, though not as slow as the porcelain cutting and priming. Both are week-in, week-out work for us, and there are finished examples of each on our patios and decking page.
Living With Them
Porcelain is genuinely close to zero maintenance. It doesn't need sealing, ever. It won't stain from barbecue fat, red wine or dropped curry, because there's nowhere for any of it to soak into. Wash it down once or twice a year and it looks the same in ten years as it did the week it went down.
Sandstone asks a bit more. Sealing is optional rather than required, but it makes spills easier to shift. It'll pick up leaf tannin marks under a tree and it'll darken and mellow over the years. Most people who choose sandstone are choosing it partly for that, so it's a feature rather than a chore, but it isn't a fit-and-forget surface in the way porcelain is.
What They Cost
Rough UK guide, supplied and laid, including proper groundwork:
- Indian sandstone: roughly £80 to £120 per m²
- Porcelain: roughly £100 to £150 per m²
Materials are part of it, with sandstone slabs typically £20 to £35 per m² and porcelain £30 to £60, but the labour gap matters just as much because of the priming and the cutting.
For a 30m² patio that's a meaningful difference, though not usually the thing that decides it. What moves the number far more is access, and how much muck has to come out. Steps, walls or drainage push it up again. We price properly off a site visit rather than per square metre off a photo.
Which One I'd Pick
Some gardens answer it themselves:
- New build, grey windows, small rear garden. Porcelain, large format, laid to run out from the doors. It makes a small garden read bigger than sandstone will.
- Period property, mature planting, curved borders. Sandstone, mixed-size pack, random pattern. It'll look like it's been there thirty years within two.
- Under a big tree. Porcelain. Leaf tannin and sap won't mark it.
- Budget is tight and you want the garden finished properly. Sandstone, and put the difference into decent edging, lighting or a bigger seating area. A well-detailed sandstone patio beats a bare porcelain one every time.
- You hate maintenance. Porcelain, no contest.
And if you haven't settled on stone at all yet, we've weighed hard surfacing against timber in patio vs decking.
Not sure which suits your garden?
We lay both, so we've no reason to push you either way. We'll come and look at the house, the light and the space, and tell you honestly which one we'd use and why.