Resin bound surfacing mixes natural stone aggregate directly into a UV-stable polyurethane resin binder before it is trowelled onto the prepared base. The stones are fully encapsulated, so the surface is smooth underfoot, permeable, and SuDS compliant. Because water passes through the surface rather than running off it, most Cambridge front driveways do not require planning permission under permitted development rules. The aggregate stays locked in place, which means no loose stones and no gaps for weeds to establish.
Resin bonded surfacing works differently: resin is applied to the base first, then loose aggregate is scattered on top and the excess swept away. The result is a textured, stone-effect finish, but it is not permeable, and loose stones can detach over time. Resin bonded surfaces do not meet SuDS compliance requirements, so a front driveway conversion using this method may still need planning permission. The two products are often confused in quotes, so it is worth confirming which one is being specified before any work is agreed.
The base beneath either surface is what determines whether the finish lasts. A resin bound layer trowelled over a base that moves, holds water, or has inadequate drainage falls will crack and lift regardless of the resin quality. Cambridge’s clay-heavy ground north of the city is particularly unforgiving: without correct falls and a properly compacted MOT Type 1 sub-base, water sits beneath the surface through winter and the bond breaks down. A site assessment checks base condition, drainage falls, and edge restraints before any quote is produced, so the specification matches the actual ground conditions at your address.