Comparisons · 4 min read
Concrete Versus Stone Furniture
Weight, cost, staining and repair. Why cast concrete does things a stone slab cannot, and the reverse.
They get grouped together as the heavy materials, and they behave differently in almost every way that matters. The short version: stone is cut away from something that already exists, concrete is poured into a shape that does not exist yet. Everything else follows from that.
Subtractive against additive
A stone piece starts as a block. Every feature is removed with a saw, a bit or a polisher. You are limited to what you can cut out of what the quarry produced, which means slabs, right angles, simple profiles, and a price that climbs with every curve.
A concrete piece starts as a mould. The shape is whatever the mould is, including shapes no saw would make: a hollow drum with no seams, a slab with a cast-in edge detail, a surface textured by the formwork itself. The cost sits in the mould, not in the cutting, so complexity is cheap once and expensive to repeat.
That one difference explains the price structure of both. Stone is cheap for one simple piece and expensive for one complicated piece. Concrete is expensive for the first piece of any shape and cheaper for the second of the same shape.
Weight, and how to cheat it
Both materials are heavy enough that you plan around them. For the same solid volume they land in a similar range, with stone usually slightly denser.
The real lever is not the material, it is whether the piece is solid. A 60 mm cast slab on steel plates gives you the presence of concrete at a weight two people can place. The same bench cut from a solid stone block would be much heavier and much harder to make at that proportion. And a hollow cast, like a drum table, gives you a form that reads solid and lifts like a crate.
Stone cannot be hollow in the same way. You can cut a cavity, but you are paying to remove material you already bought.
Staining and etching
Both are porous. Both need a sealer. Neither is stainproof.
Concrete stains through its pores: oil, wine and coffee colour the cement paste if given time. Sealed, you have minutes rather than seconds, which covers normal life.
Marble has the same porosity problem plus a chemical one. Acid dissolves the stone itself, so lemon juice or vinegar leaves a dull etched patch even if nothing soaked in. Granite is far more resistant to that, which is why it ended up in kitchens.
Concrete has its own version: acid attacks cement paste too, so the rule is identical. Nothing acidic on either, ever.
Repair
This is where concrete quietly wins.
A cast concrete surface is not uniform to start with. There are small voids from the pour, a slight variation in tone across a slab, the texture the mould left behind. A filled chip disappears into that, because there was never a perfect field for it to interrupt.
A polished stone surface is uniform. Any repair is a patch in the middle of something even, and the eye finds it immediately. Chips in stone are usually lived with rather than fixed.
How they look over time
Stone arrives finished. Polished granite in twenty years looks much like polished granite today, minus a few scratches.
Concrete moves. It darkens slightly where it gets handled, the sealer wears through at the contact points, small marks accumulate. Some people hate that. Other people buy concrete specifically for it, because the surface ends up recording the use rather than resisting it.
Neither is the correct answer. It is a question about whether you want furniture that stays the same or furniture that keeps a record.
Choosing between them
| If you want | Choose |
|---|---|
| A simple flat slab, highly polished, visually perfect | Stone |
| A shape that is not a rectangle | Concrete |
| Maximum resistance to kitchen acids | Granite |
| A surface that can be repaired invisibly | Concrete |
| Big presence at a weight two people can move | Hollow or slab-cast concrete |
| A material that will not change at all | Stone |
And one honest note on both: whatever you choose, check the floor underneath it. An 84 kg bench on four small feet concentrates its load, and that matters more on an old timber floor than the difference between the two materials ever will.
Common questions
- Is concrete furniture heavier than stone?
- Usually a little lighter for the same volume, but the difference is small and both are heavy. What changes the weight far more is whether a piece is cast solid or cast hollow. A hollow-cast drum can weigh a quarter of what the same shape would weigh solid.
- Does concrete stain more easily than marble?
- Both are porous and both need sealing. Marble has the additional problem that acid etches it, so wine and lemon can dull the polish even when nothing soaks in. Sealed concrete generally forgives more of normal life than polished marble does.
- Can concrete furniture be repaired?
- Yes, and more convincingly than stone. A chipped edge can be filled with a matched mix and the repair blends into a cast surface that was never uniform to begin with. A chip in polished granite is visible forever because the surface around it is perfectly even.
- Which is better outdoors?
- Both work. The thing that kills either one is water sitting in the surface and freezing. Keep the sealer current, keep the base out of standing water, and either material will outlast the terrace.