A resin bound driveway is a smooth, seamless surface made by mixing kiln-dried decorative gravel with a clear two-part resin until every stone is fully coated, then trowelling the blend by hand onto a prepared base. Because the stones are bound together throughout the mix — rather than scattered loose — there are no migrating pebbles, and the gaps between particles stay open so water drains straight through. You will often see it called resin bound gravel: that is exactly the same product.
How a resin bound surface is made
Dried, washed aggregate and a measured dose of resin are combined in a forced-action (pan) mixer until each particle is evenly coated. A drum or cement mixer will not do — it tumbles rather than shears, leaving stones part-coated. The wet mixture is then spread and hand-trowelled to a level finish. Once mixed, the material has a short working window, so it must be laid promptly — see how a resin driveway is installed.
What it is made of
The two ingredients are decorative aggregate and resin. The resin should be a two-part aliphatic polyurethane — “aliphatic” means it stays colour-stable in sunlight and resists the yellowing that affects cheaper aromatic resins. Aggregates range from natural rounded gravels and crushed granite to marble, quartz and recycled glass, in sizes such as 1–3 mm, 2–5 mm and 6 mm. Most quality blends combine several grades of stone for good packing, appearance and drainage. See the full range on our colours and finishes guide.
The base build-up beneath it
Resin bound is only the wearing course — the top layer of a multi-layer pavement. Beneath it sits a permeable base: an open-graded asphalt binder course over a compacted MOT Type 3 sub-base, on stripped sub-grade with a geotextile membrane where needed. Edge restraints (aluminium profiles or kerbs set to the surface depth) contain the surface so it cannot crumble at the edges. The surface layer itself is laid at roughly 15–18 mm for a driveway, with most makers specifying a minimum of 18 mm for vehicles.
Why it is permeable
Because the resin only glues the stones to each other at their contact points, the spaces between particles stay open all the way down (typically 15–25% voids). Rain soaks through the surface, through the permeable base, and into the ground or a soakaway. That makes a correctly built resin bound driveway SUDS-compliant, so a front driveway over 5 m² generally needs no planning permission. Permeability is a whole-system property: laid over sealed tarmac or concrete, the surface alone does not make the driveway permeable.
Where it is used
The same system suits driveways, garden paths, patios, pool surrounds and courtyards. With the right base it carries foot traffic and light vehicles. Its smooth, level finish is comfortable underfoot and accessible for wheelchairs and prams — finer 1–3 mm aggregates give the smoothest result.
How to recognise a quality system
The clearest mark of quality is a current BBA Agrément certificate for the specific resin system, which confirms independent testing of strength, permeability, skid resistance and UV stability. Established UK brands include Addagrip (Addaset), SureSet, DALTEX and RonaDeck. Ask the installer to confirm the resin is aliphatic (UV-stable), the aggregate is kiln-dried, and that you will get a manufacturer-backed warranty — our guide to choosing an installer covers what else to check. To price a resin bound drive, use the cost calculator.