Concrete as a structural material lasts indefinitely, but the finish that makes it look good in a home — the polished, sealed surface — has its own maintenance timeline separate from the concrete underneath.
Over 10 to 20 years, the concrete itself won't degrade in normal domestic conditions; what changes is the sealer's ability to keep the surface stain-resistant.
Normal ageing
Hairline crazing typically appears within the first year or two as the slab fully cures and settles, and this is expected — it's part of the finish's character rather than a fault to chase.
Traffic areas on floors, and areas around a hob or sink on worktops, will show a gradual dulling of the sealer's sheen well before the concrete itself shows any wear.
Sealer and maintenance regime
The sealer is what protects concrete from staining — the concrete beneath is porous, so an intact sealer is doing all the work. Depending on the sealer type, resealing is typically needed on a multi-year cycle rather than annually, more often in high-traffic kitchen areas than in a hallway.
Day to day, a damp mop or cloth is sufficient. Acidic spills — wine, citrus, vinegar — should be wiped up promptly on a worktop, since these are what breach a worn sealer fastest.
Early warning signs
Water no longer beading on the surface, or a dull patch that doesn't wipe clean, indicates the sealer has worn through in that spot and the porous concrete underneath is now exposed to staining.
A stain that's darkened and won't lift with normal cleaning means it's penetrated past a failed sealer into the concrete itself.
Repair versus replace
Resealing an entire floor or worktop is a routine maintenance job, not a repair, and should be planned for rather than treated as a failure. A single stained patch can sometimes be treated locally, though an exact colour match on an aged surface isn't guaranteed.
Genuine structural cracking — as opposed to expected surface crazing — is a different issue and needs an assessment by a structural engineer before any cosmetic repair is considered, since it may point to a problem with the slab or the ground beneath it rather than the finish.
Common questions
How often does polished concrete need resealing?+
It depends on the sealer used and how heavily the surface is used, but a multi-year cycle is typical for kitchen worktops and floors, with high-traffic areas needing attention sooner than quieter zones.
Is the crazing on my concrete floor a problem?+
Fine hairline crazing is a normal characteristic of the material and isn't structural. If you see a wider crack with any movement or stepping either side of it, that's different and should be looked at by a structural engineer.
Can a concrete worktop stain permanently?+
Yes, if the sealer has worn through and an acidic or coloured liquid penetrates the porous concrete beneath. This is why keeping the sealer maintained matters more with concrete than with a non-porous material like quartz.
Get concrete resealed or assessed
We can assess an existing concrete floor, stair or worktop and advise honestly on resealing versus a structural issue that needs an engineer.