Sealing a driveway after cleaning is one of those add-ons that gets offered by every contractor but is not always clearly explained. Does it actually matter, or is it an upsell? The honest answer is that sealing genuinely extends how long a clean lasts and offers real protection against staining, but it is not essential for every driveway, and unsealed surfaces are far from doomed if properly cleaned on a reasonable schedule.
Below is what sealing actually changes about how a driveway weathers, how often it needs redoing, and how to decide whether it is worth the extra cost for yours.
What sealing actually does
A driveway sealant is applied after cleaning to fill the surface pores of block paving, concrete or natural stone, creating a barrier that repels water, oil and dirt from soaking into the material. This means spills sit on top rather than staining, weeds struggle to establish in sealed joints, and moss and algae find it harder to grip a sealed surface compared with a bare, porous one.
It also tends to enhance colour, giving either a wet-look sheen or a more subtle matt finish depending on the product chosen, which is part of why it is often marketed alongside the practical benefits.
How weathering differs over time
An unsealed driveway exposed to North East rain, frost and traffic will gradually become more porous as the surface weathers, meaning oil stains, tyre marks and organic staining from leaves and algae soak in more readily each year and become progressively harder to fully remove with cleaning alone. Photos of the same unsealed driveway at one, five and ten years typically show a steady darkening and staining build-up, particularly in wheel-track areas and shaded corners.
A sealed driveway weathers more slowly and more evenly, since the sealant is doing the work of shedding water and resisting staining that the bare surface would otherwise absorb, keeping the original colour and finish visibly fresher for longer between cleans.
Re-sealing cycles and what they cost
Sealant is not permanent and wears with UV exposure, traffic and weather, typically needing reapplication every two to five years depending on the product used and how much use the driveway gets. Re-sealing after a professional clean typically adds £4-£8 per square metre on top of the cleaning cost, a genuine additional expense but one that meaningfully extends the interval before the next deep clean is needed.
Skipping re-sealing does not damage the driveway, it simply means the surface gradually returns to behaving like an unsealed one as the sealant wears away, so it is a maintenance choice rather than a one-off necessity.
Is sealing worth it for your driveway?
For a driveway that sees regular oil drips, is under trees dropping staining debris, or where you want to maximise time between full cleans, sealing is genuinely worth the extra cost. For a driveway with light use, minimal tree cover and where you are happy to clean every couple of years regardless, unsealed and simply keeping up with regular cleaning is a perfectly reasonable, lower-cost approach.
Either way, sealant should only go onto a properly cleaned and fully dry surface, applying it over dirt or algae just traps the problem underneath, so the timing and quality of the clean beforehand matters as much as the sealant itself.
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