Is block paving sealing worth it?
Sealing adds £5 to £8/m² to a block paving clean. It is worth the money on shaded, tree-lined or coastal drives where weeds and algae return fast, and on drives where oil staining is a recurring risk. On open, sunny, low-traffic drives the benefit is smaller and the decision is mostly cosmetic.
Last updated: August 2026.
What sealing buys you
Three concrete benefits. Locked joints: hardened kiln-dried sand resists washing out, so blocks stay tight and weeds lose their foothold. Slower regrowth: algae and moss colonise sealed surfaces noticeably more slowly. Stain resistance: oil, leaf tannin and rust sit on the surface where they can be cleaned, rather than soaking into the block.
Where it pays on Teesside
The drives where sealing genuinely earns its £5 to £8/m²: shaded and north-facing drives in Acklam, Hartburn and the tree-lined streets of Yarm and Guisborough, where untreated paving greens up within a winter; coastal drives in Redcar and Seaton Carew, where salt weathering scours unprotected block faces; and any drive where the family car leaks occasionally, because oil on sealed blocks is a wipe-up rather than a shadow.
Where it is optional
Open, south-facing drives with good drainage dry fast after rain, and fast-drying paving grows little. If your drive gets sun for most of the day and you clean it every few years anyway, sealing is a looks decision: the wet-look finish is lovely, but the practical case is thin.
The non-negotiables
If you do seal, three things decide whether it works. The paving must be properly cleaned and treated first, because sealer locks in whatever is underneath. It must be bone dry, typically 24 to 48 hours of dry weather after washing, or trapped moisture blooms milky white under the film. And it needs two coats: the first drinks into the sand and blocks, the second builds the protective film. A one-coat quote is a false economy.
The maths over five years
A typical sealed drive pushes its next clean back by two to three years compared to an unsealed one. On a 50m² drive, £300 of sealing that defers a £175 clean twice over five years roughly breaks even, and everything beyond that, the weeds that never rooted, the oil that wiped off, is profit. On a shaded drive the case is clear; on a sunny one, choose it for the finish, not the savings.